Theories of schizophrenia: a genetic-inflammatory-vascular synthesis
© Hanson and Gottesman; licensee BioMed Central Ltd. 2005
Received: 26 July 2004
Accepted: 11 February 2005
Published: 11 February 2005
Schizophrenia, a relatively common psychiatric syndrome, affects virtually all brain functions yet has eluded explanation for more than 100 years. Whether by developmental and/or degenerative processes, abnormalities of neurons and their synaptic connections have been the recent focus of attention. However, our inability to fathom the pathophysiology of schizophrenia forces us to challenge our theoretical models and beliefs. A search for a more satisfying model to explain aspects of schizophrenia uncovers clues pointing to genetically mediated CNS microvascular inflammatory disease.
A vascular component to a theory of schizophrenia posits that the physiologic abnormalities leading to illness involve disruption of the exquisitely precise regulation of the delivery of energy and oxygen required for normal brain function. The theory further proposes that abnormalities of CNS metabolism arise because genetically modulated inflammatory reactions damage the microvascular system of the brain in reaction to environmental agents, including infections, hypoxia, and physical trauma. Damage may accumulate with repeated exposure to triggering agents resulting in exacerbation and deterioration, or healing with their removal.
There are clear examples of genetic polymorphisms in inflammatory regulators leading to exaggerated inflammatory responses. There is also ample evidence that inflammatory vascular disease of the brain can lead to psychosis, often waxing and waning, and exhibiting a fluctuating course, as seen in schizophrenia. Disturbances of CNS blood flow have repeatedly been observed in people with schizophrenia using old and new technologies. To account for the myriad of behavioral and other curious findings in schizophrenia such as minor physical anomalies, or reported decreased rates of rheumatoid arthritis and highly visible nail fold capillaries, we would have to evoke a process that is systemic such as the vascular and immune/inflammatory systems.
A vascular-inflammatory theory of schizophrenia brings together environmental and genetic factors in a way that can explain the diversity of symptoms and outcomes observed. If these ideas are confirmed, they would lead in new directions for treatments or preventions by avoiding inducers of inflammation or by way of inflammatory modulating agents, thus preventing exaggerated inflammation and consequent triggering of a psychotic episode in genetically predisposed persons.
When the solution to a clinical or scientific puzzle eludes us for more than a century, as with schizophrenia (formerly dementia praecox), we need new ways of thinking about the problem [1, 2]. Efforts to understand schizophrenia have focused on neurons and, especially, the role of presumed excess dopamine neurotransmission. We believe that genetic, environmental, and stochastic factors combine with epigenetic factors to create episodes of the illness [3–5]. Thus, the syndrome of schizophrenia is viewed as an endpoint in a dynamic process variously conceptualized as degenerative or developmental or alternating at different points in the process [6–10].
Degenerative models imply that after a period of normal development, the organism, or one of its parts, takes a wrongful turn in its trajectory and begins to malfunction. This describes the eventual outcome for all life forms and is a biological restatement of the second law of thermodynamics. Since degeneration is universal, stating that an illness is degenerative is not particularly helpful. What would be helpful is to determine when in the life course the degeneration begins and how the degeneration is initiated and proceeds. Answers to the "when?" and "how?" questions would then describe the degenerative process in developmental terms.
Developmental models of schizophrenia implicate abnormalities of early brain development predisposing to future schizophrenia. The proponents of the model further argue that the perturbations of development are limited to the early times of development and are discontinuous. Without this qualifier, developmental models are indistinguishable from degenerative models where the degeneration commences early in the life span. The early abnormalities are not necessarily the cause of schizophrenia, but, instead, create a state of risk for a future episode of schizophrenia. That is, a diathesis or predisposition is not a disease. Consequently, there must be factors later in life that convert the vulnerability to an illness. These additional factors are presumed to damage development in such a way that a predisposition becomes actualized. To gain a complete understanding of the syndrome, we must again return to the question of " what happens?"
Following this line of reasoning, the distinction between degenerative and developmental models blurs. In fact, a medical-behavioral condition can be both developmental and degenerative as exemplified by Down syndrome [11–13]. Individuals born with trisomy 21 exhibit a number of developmental anomalies including cardiac malformations, abnormal dermatoglyphics, skeletal changes, and muscular hypotonia, to name a few. As trisomy 21 infants mature, most exhibit degrees of mental retardation. By about age 50, these individuals invariably develop Alzheimer-like CNS degenerative changes that can be seen at autopsy .
Schizophrenia involves both developmental and degenerative features. From the time of Bleuler  and Kraepelin, "It is certain that many a schizophrenia can be traced back into the early years of the patient's lives..."  p. 252. The 'follow back' studies of schizophrenia support these views . Likewise, prospective studies of children at high risk for schizophrenia report developmental anomalies in motor skills, cognition, and attention long before the onset of overt illness [17–19]. Overt psychotic symptoms for some individuals usually start in the late teenage years or early twenties, but the illness can start as early as middle childhood  and may, more rarely, start in old age  p 73].
The evidence suggesting early developmental perturbations in schizophrenia is compelling. At the same time, there certainly are examples of deterioration reminiscent of Kraepelin's suggestion for some people with schizophrenia. However, deterioration in clinical course may not indicate CNS deterioration. Instead, the decline could be a secondary consequence of an illness that disrupts education, economic achievement, and social functioning leading to a downward spiral in all aspects of adult life. Consistent with an early degenerative process, there are reports of declining cognitive function preceding onset of psychosis . Proponents of neurodevelopmental models suggest that the premorbid cognitive abnormalities are developmental risk factors for future schizophrenia (c.f ) and argue that such abnormalities show little evidence of decline after onset [6, 24]. Whether developmental or degenerative, the premorbid cognitive deficits seen in schizophrenia are also seen in other disorders  and lack specificity and sensitivity thus detracting from the concept that the cognitive abnormalities seen in schizophrenia are useful endophenotypes . The strongest evidence for a neurodegenerative phenomenon comes from imaging studies showing progressive loss of brain volumes [27–29]. Neuropathological studies fail to find widespread classic signs of neurodegeneration such as gliosis though there are exceptions to this generalization . Observations of abnormal dendritic arborization [31, 32] are consistent with the neuroimaging evidence suggesting abnormal connectivity between brain regions . As a cautionary note, most of the neuroimaging and neuropathology results are subject to confounds from the effects of medications and various other treatments, post-mortem intervals, possible effects of diet, smoking habits, as well as a myriad of other potential confounds associated with glucocorticoid mediated stress following chronic illness and associated life's limitations [33, 34].
The symptoms of schizophrenia are highly variable. Within families (and thus presuming relative homogeneity of genetic and environmental factors) symptoms can vary widely over time, as illustrated by identical quadruplets concordant for schizophrenia . Even within affected individuals, symptoms will wax and wane and may even remit  suggesting a life long process.
The major behavioral symptoms of schizophrenia include alterations in cognition, memory, perception, thought (inferred from language), motor functions, and affect. People with schizophrenia may show abnormal dermatoglyphics and other minor physical anomalies [37–42]. Other oddities to be incorporated in a comprehensive explanation of schizophrenia include highly visible nail fold capillaries [43, 44] and the rarity of rheumatoid arthritis among schizophrenic persons . These physical characteristics suggest the need to look beyond the nervous system per se to have a comprehensive view of the illness.
The fact that the schizophrenia syndrome, as currently defined, is relatively common provides important information about the frequency of causal factors. About 1% of the population will experience schizophrenia during the lifespan. Except for a few rare exceptions, this 1% risk is remarkably constant around the globe regardless of culture, geography, or ethnicity. Men and women are affected equally. These facts mean that the risk factors for schizophrenia must also be common and ubiquitous. Given that the concordance rate for schizophrenia in identical twins  is only about 50%, there must be at least two global risk-increasing categories for schizophrenia, i.e., something(s) genetic and something(s) environmental. Assuming these risk factors are independent of each other, the joint probability of acquiring both risk factors is the product of their population frequencies that, for schizophrenia, equals about .01. To make a simplifying assumption to allow easy calculations, let us say that the two risk factors are present with about equal frequency in the population. With this simplification, straightforward mathematics indicates that the individual frequencies of these factors are close to the square root of the population frequency of 1%. That would mean that about 10% of the population would encounter at least one risk factor. The math indicates that the greater the number of independent risk factors, the more common they are. [See  for further elaboration].
Our challenge is to develop a theory of schizophrenia that can plausibly explain an illness that affects all domains of behavior (thought, affect, motor performance, etc), that has elements of developmental perturbations early in life leaving clues such as minor physical abnormalities, and also has elements of degenerative changes. At the same time, the defect is so subtle that we can't find the cause(s) with our best modern technology. Furthermore, in spite of brain-wide dysfunctions, many individuals with schizophrenia remain sufficiently intact that, with good treatment and a bit of luck, can maintain jobs and function usefully in society. Thus, we need to find frequent and ubiquitous factors that can affect virtually all brain functions as well as creating somatic signs, but they operate in ways that leave these functions only slightly "off kilter" as compared to the complete disruption seen in strokes, or classical degenerative disorders such as Alzheimer, or as seen in Down syndrome where the behavioral pathology is apparent from earliest stages. As we try to explain schizophrenia, we must account for most all of the developmental and degenerative features of schizophrenia.
To account for the panoply of signs and symptoms seen in schizophrenia, any complete theory of schizophrenia must include organism wide systems. In addition to the nervous system, the immune system and the vascular system are defensible candidates. Both are invoked in the following theory: Some schizophrenia psychoses are the result of damage to the micro-vascular system in the brain initiated by genetically influenced abnormal inflammatory processes acting in response to ubiquitous environmental factors that trigger inflammatory responses, including infection, trauma, or hypoxia. It is the relative infrequency of the vulnerable genotypes in the population  that results in only a small proportion developing overt psychosis.
We wish to emphasize that our hypothesis specifically identifies the microvascular system as the critical site of inflammation. We postulate that the inflamed micro-vessels lose their coupling with astrocytes, leading to disrupted regulation of cerebral blood flow and damage to the blood brain barrier. These disruptions in homeostatic mechanisms then lead to abnormal signal processing. Our focus on inflammation of the vessels differentiates our hypothesis from models of widespread parenchymal inflammation such as seen in psychotic syndromes following, for example, encephalitis lethargica, or paraneoplastic syndromes. Many acute inflammatory disorders of the brain involve inflammation of both the parenchyma and the vasculature. By contrast, we are proposing a chronic, smoldering, inflammation of the vessels alone. And, finally, we distinguish our hypothesis from the theories of schizophrenia implicating direct parenchymal infection of the brain (c.f. ) and also differentiates our hypothesis from speculations about schizophrenia that invoke infectious agents altering DNA .
Many prior debates about inflammation in the brains of people with schizophrenia have focused on the presence of absence of gliosis (see  for review). The consensus opinion is that gliosis, though present in some cases, is not a consistent feature of the neuropathology of schizophrenia. However, as Harrison  points out, evaluating gliosis is fraught with a multitude of problems and is not a definitive indicator of degenerative/inflammatory changes in the brain. More recent efforts have demonstrated activation of microglia in the brains of some individuals with schizophrenia implying an ongoing immunopathological process in addition to what ever happened early in development . Ongoing neurodegenerative processes are suggested by increased levels of S100B, a small calcium binding astrocytic protein that is involved in inducing apoptosis and modulating proinflammatory cytokines [53–55].
It is likely that the current clinical syndrome of schizophrenia is etiologically heterogeneous. We do not pretend to explain all (DSM or ICD) cases of syndromal schizophrenia. Instead, we put forward our hypothesis as an attempt to define a psychiatric syndrome in terms of a particular pathophysiology. Following this course may then help refine our nosology (see also section on 'specificity' below) and cause us to recalculate basics 'facts' such as prevalence rates.
A primer on CNS blood supply
Neurons derive their energy from oxygen and glucose delivered by the vascular system, plus lactate and glycogen derived from astroglia . The combination of neurons, astroglia, and micro-vessels form a metabolic trio  whereby the glia extend processes interacting with neurons on the one hand and, on the other, form endplates interdigitated into capillary walls. Rather than being passive conduits, the CNS vascular system is the most precisely managed and the most complex fluid dynamic system known. Regulation of cerebral blood flow (CBF) is managed primarily by a coupling between astrocytic glial cells [56–59] and capillary endothelium [60–65]. Astrocytes sense local neuronal metabolic activity and adjust blood flow as needed. Cerebral vessels change caliber in response to vasoactive substances released by astrocytes activated by glutamate receptors [56, 66, 67]. Serotonin , acetylcholine  and dopamine [66, 70, 71] transmission between astrocytes and micro vessels also play roles. When the neuronal activation of discrete areas is sustained over longer periods, vasoactive substances stimulate angiogenesis resulting in increased capillary density  thus enhancing local neuronal circuitry. Conversely, decrease in capillary density is likely to reduce the functional capacity of brain areas so affected . Consequently, capillary beds in the cortex are not distributed in uniform fashion . There are close relationships among local neuronal activity, density of capillary bed, and the distribution of valve-like flow control structures .
Developmentally, the CNS vascular system originates from capillary endothelial cells that migrate into developing neuro-ectoderm under the influence of trophic factors such as vascular endothelial growth factor (VEGF)  and erythropoietin  both produced by astroglia. The developing micro-vasculature, although comprising only 0.1% of the entire brain, and operating under the influence of genetic directives, has a key role in the development, maintenance and repair of the brain . In turn, VEGF has trophic effects on neurons and glial cells, and the activity of VEGF influenced angiogenesis is directly proportional to the high metabolic activity of neocortical development . Thus, angiogenesis and neurogenesis occur simultaneously and synergistically [78–80]. In addition to formation of capillaries themselves, intricate anastomoses between micro-vessels further 'fine tune' the metabolic support of developing glia and neurons 
The genetics of infectious & inflammatory diseases
When infectious agents give rise to inflammatory vascular disease, the nature of the infectious agent may be less important that an individual's genetically influenced inflammatory response. The concept that infectious disease may have a genetic component is, of course, not new. Many agricultural geneticists make their livings by breeding disease resistance into both plants and animals [82, 83]. One of the founders of behavioral genetics, Franz Kallmann , showed genetic factors influenced acquiring tuberculosis (DZ concordance = 26%, MZ concordance = 87%), an observation that was confirmed in modern times [85, 86]. Many other infectious diseases appear to have genetic factors influencing susceptibility or resistance to the infection [87–97]. Mechanisms for genetically mediated responses to infection occur through genetic variations in immune mediators such as cytokines and HLA factors [98, 99].
Familial Mediterranean Fever (FMF) [100, 101] provides a heuristic Mendelian example. The gene for FMF is located on the short arm of chromosome 16 and produces pyrin (marenostrin) that functions in a negative feed back loop to suppress inflammation. Absence of pyrin leads to exaggerated inflammatory responses. Vasculitis is one of the consequences . Additionally, very high rates of rheumatic fever (RF) or rheumatic heart disease (RHD) are found in relatives of patients with FMF. Having even one mutant gene appears to lead to immune hyperactivity to streptococcal antigens. We also know that antibody  production and cytokine activity  in RF patients is more marked than non-rheumatics. It is clear that genes influence the host's response to infection. A similar line of reasoning applies to other inducers of inflammation such as traumatic injury  or hypoxia [107, 108].
Just as the CNS blood supply is highly regulated, the inflammatory systems in the brain require 'fine tuning.' Given the limited ability for adult brain to regenerate, and assuming there is little tissue to spare, it would make sense that the brain should be protected from overabundant inflammatory reactions . Astrocytes play a key role in the expression of inflammatory cytokines, chemokines, and growth factors involving the modulation of gene expression for these factors [109–111].
Let us suppose that schizophrenia develops following an infection (or trauma or anoxia – the environmental contributors) but the host's response is determined by genetic factors regulating the nature and degree of inflammation. That infectious agents may be operative in schizophrenia is supported by several of lines of evidence. Summaries can be found in numerous sources [49, 50, 112–116]. The same concept applies to trauma  or anoxia [79, 107] that may also stimulate inflammatory processes.
Vascular disease and psychopathology
The syndrome of schizophrenia is likely to be etiologically heterogeneous and a multitude of CNS disorders can give rise to schizophrenic-like psychoses . The idea that CNS micro-vascular diseases, in particular, are factors in psychotic disorders is also an old idea [118, 119] that deserves a second look in light of new perspectives offered by developments in the genetics of inflammatory diseases. There are many examples of psychoses resulting from micro-vascular CNS disease including lupus and Sjögren syndrome . Neuroimaging and neurocognitive deficits in these disorders are similar to those seen in schizophrenia . Psychoses associated with substance abuse are also associated with CNS vasculitis . Furthermore, infectious agents such as syphilis  and rheumatic fever (RF – see below), lead to micro-vascular disorders of the CNS that are associated with psychiatric symptoms including psychoses. Thomas, et. al.  also demonstrated small vessel abnormalities in the depressed elderly. At the same time, there is growing interest in cytokines and other inflammatory agents in psychoses as well as growing awareness that inflammatory reactions are modulated by neuropeptides .
Inflammatory processes often damage the precise regulation of cerebral blood flow. The wide spectrum of clinical conditions thought to be created, in part, by inflammatory CNS micro-vessel disease include Alzheimer disease where it is thought that inflammatory processed damage the micro-vascular endothelium causing insufficient blood flow leading to oxidative stress, a build up of amyloid, and eventual cell death [127–135]. Cerebral palsy is also conceptualized as an infectious-inflammatory-vascular disorder where the vascular lesion is complete thrombosis . Neurotoxic effects of methamphetamine and cocaine appear to be due to induction of inflammatory genes in small vessel endothelial cells [122, 137], thus explaining the vascular damage seen in amphetamine and cocaine abuse that was previously attributed to contaminants of injected drugs [122, 138–140].
Returning to the early stages of life, we have seen that the development of the neurons and glia are intimately associated with, and dependent on, the parallel development of the CNS vasculature. If the stated theory is correct, and given the developmental perspective of schizophrenia ---early developmental perturbations of the CNS set the stage for later schizophrenia--- we would expect to find support for the idea that inflammatory events early in life affect CNS vascular function. Such is the case. Whether the early insults are traumatic, infectious, or hypoxic; inflammatory process are involved in the attempts to protect and repair by modulating angiogenesis [141–148]. Thus, the reports implicating pregnancy and birth complications (anoxia, trauma or maternal infections) in the development of some cases of schizophrenia [149, 150] could all be mediated by the common pathway of inflammatory-vascular mechanisms. Individuals who's genes created perturbations in inflammatory-vascular regulation would continue to experience abnormalities of protection and repair in response to subsequent CNS insults. Over time, the accumulation of 'hits' could lead to brain dysfunction to the extent seen in psychoses. The greater the number and duration of 'hits,' the greater the risk for a deteriorating /degenerative course. That neuroleptics may alter the permeability of the blood brain barrier and modify immunoregulation in the CNS  strengthens the argument for early treatment as a strategy to prevent deterioration.
Alterations of cerebral blood flow in schizophrenia
Since the time of Seymour Kety's pioneering efforts [152, 153], there has been interest in altered cerebral blood flow in people with schizophrenia. An in-depth review of this large literature is beyond the scope of this paper. The interested reader is referred to discussions of reduced anterior cerebral perfusion leading to the concept of 'hypofrontality' in schizophrenia [154, 155] and to more recent reviews [156–158]. Bachneff's  review and theory about defects in regulation of CNS microvascular systems is particularly relevant. These reviews summarize a consistent body of evidence showing reduced cerebral blood flow in brains of people with schizophrenia especially to anterior regions. Flow deficits are seen in medication-naive new onset cases [160, 161] and more established cases free of neuroleptics  suggesting that flow perturbations are neither the consequence of duration of illness nor treatment. Neuroleptics can alter cerebral blood flow [163, 164] although the effects may be regionally and drug specific [165, 166]. Decreased frontal flow is often associated with negative symptoms [167, 168]. In addition to the frontal cortex, flow abnormalities in people with schizophrenia have been noted in the cingulate cortex [169, 170], thalamus , basal ganglia , parietal cortex [167, 170] and cerebellum . Furthermore, in some instances, flow rates are increased [160, 170]. Rather than a simple hypothesis of hypofrontality in schizophrenia, theorizing is evolving toward a concept of "dysfunctional circuits" or "inefficient dynamic modulation"  of cerebral metabolism which is supported by other examples of abnormal modulation of cerebral blood flow in response to activation tasks [171, 174]. Disturbances of blood flow in schizophrenia are well documented but are not limited to schizophrenia. Disturbed cerebral blood flow is also reported in obsessive compulsive disorder  and depression [176, 177] as well as in Alzheimer disease (cited earlier). The usual interpretation is that alterations of blood flow arise as a consequence of abnormal neuronal metabolism. The theory proposed by this paper turns the causal arrow around to suggest that abnormalities of blood flow lead to altered neuronal-glial function that, in turn, leads to psychopathology. There has been scant direct visualization of the vascular system in schizophrenia, but at least one laboratory has found evidence of atypically simplified angioarchitecture and failure of normal arborization of small vessels .
Post- streptococcal behavioral syndromes as a model
Post-streptococcal neuropsychiatric syndromes include Syndenham chorea, the PANDAS/obsessive compulsive syndrome, tics including Tourette syndrome, and possibly, ADHD [178–184]. Psychotic disorders are also implicated [183, 185] and see citations below.
Sydenham chorea is the best-known neuropsychiatric complication following streptococcal pharyngitis. The association of psychoses and Sydenham chorea as well as with RF even in the absence of chorea, was discussed in the 17th and 18th centuries starting with Sydenham himself (see ). The interest in psychoses associated with RF continued throughout the 1900's [187–197]. People with a history of Sydenham chorea and/or rheumatic fever are at high risk for developing psychopathology later in life [198, 199] with a relative risk for schizophrenia as high as 8.9 in a 10 year follow-up of 29 Sydenham patients . There is a suggestion that the family members of Sydenham patients are also at higher risk for psychosis .
During the 1940's-1960's when RF was still quite prevalent, people with psychoses appeared to have higher than expected rates of histories of RHD or RF)[195, 202, 203] or rheumatic chorea . Psychotic patients with RHD more often had early (<age 19) onset, movement disorders, progressively insidious courses and poor long-term outcomes . Preliminary data from a Minnesota study also finds increased rates of RHD in psychotic patients, a pattern of increased psychiatric hospitalization following an epidemic of RF, and a clinical course for "rheumatic psychoses" that disproportionately led to a severe and continuous decline in function . Although schizophrenia-like psychoses were the most common psychopathology related to rheumatic syndromes, manic-depressive, involutional, and senile psychoses were also observed [183, 197].
An inflammatory reaction of the CNS vascular endothelium (vasculitis) is a common denominator in the both acute and chronic cerebral consequences of rheumatic fever. [186, 187, 190, 195, 197, 206–209]. The microvascular lesions suggest both an obliterating process likely due to micro-emboli from rheumatic cardiac valves and an inflammatory process involving irregular proliferative changes in the vascular endothelium, dilatation of the lymphatic spaces surrounding the capillaries suggesting increased permeability of the capillary endothelium, and inflammatory cell infiltrates. Disruption of the blood brain barrier suggested by the evidence of increased permeability of the small vessels could compromise the immunological protection of the brain leading to the formation of the anti-neuronal antibodies seen in post-streptococcal CNS syndromes. In parallel fashion, people with schizophrenia show evidence of altered blood brain barrier and consequent alterations in immunological markers 
The post-strep psychopathologies provide a precedent for the hypothesis of this paper by demonstrating that an infectious process can trigger a series of inflammatory reactions that lead to a variety of somatic and psychiatric syndromes, including psychoses where vascular pathology is implicated. The pathogenicity of a strep infection is a function of the strain (genotype) of the bacterium and the genetically mediated inflammatory mechanisms of the host  and illustrates how a ubiquitous and often relatively benign environmental factor can create more serious sequelae in a limited number of genetically predisposed individuals-true genotype by environment interaction.
Abnormal behaviors develop as a result of disruptions in astroglial mediated coupling of cerebral blood flow to neuronal metabolic needs. These subtle disruptions are hard to find, as the microvasculature comprises only about 0.1% of the brain and are of a scale more appropriate for electron microscopy. None-the-less, the hemodynamic perturbations have sufficient impact to cause subtle but widespread disruption of the normally harmonious coordination of CNS function leading to a condition variously conceived as a "neurointegrative defect", "synaptic slippage" , "abnormal signal transduction" , "inefficient dynamic modulation"  or "synaptic destabilization" . The ultimate impact would lead to psychopathology including psychoses as the vascular-glial-neuron triad is progressively damaged over time after repeated inflammatory episodes. The resultant failure to regulate the delivery of oxygen and energy adequately would lead to oxidative stress [215–217]. Oxidative stress, in turn, can further damage the microvasculature and the blood brain barrier [218–220]. The astroglial-capillary partnership that protects the integrity of the blood brain barrier would be compromised, thus exposing neural tissue to damage from immunological attack . Known precedents of such processes are found in the behavioral changes seen in CNS vascular inflammatory diseases such as lupus and the post-strep syndromes described above.
This theory also captures many of the little oddities observed in schizophrenia. For example, the reported abnormalities of the nail fold capillary beds seen in some people with schizophrenia  are also seen in people with inflammatory disorders such as FMF  and rheumatoid arthritis . Another oddity is the negative association between schizophrenia and rheumatoid arthritis . There are parallels in the post-streptococcal syndromes where RF and acute post-streptococcal glomerulonephritis very rarely occur in the same patient . Some strains of group-A-streptococci identified by their M-protein serotypes are rheumatogenic while others are nephritogenic [233, 234]. Phage or phage-like elements inserted into the streptococcal DNA are a major source of variation between streptococcal strains and these elements determine pathogenicity . Additionally, host variation in humoral and cellular immune response shape the outcome of infection By analogy, individuals with vascular/CNS involvement following, for example, streptococcal infections may be systematically spared from joint involvement as a function of both the invading strain and the individuals susceptibilities. Alternatively, as postulated for Alzheimer disease (cited earlier) that is also less common in people treated for arthritis, the anti-inflammatory treatments for arthritis might reduce the risk of inflammatory brain disease.
Another line of evidence compatible with this theory is the observation that genetic linkages for schizophrenia coincide with sites for glial growth factor cell regulators  and, as we have seen, the glia are key intermediaries of CNS inflammation and vascular regulation. More specifically, emerging data demonstrate associations between schizophrenia and genetic polymorphisms in regulators of inflammation such as tumor necrosis factor alpha genes [236, 237] and interleukin-1 genes . Another piece that fits into the puzzle is the fact that neuroleptics have inflammatory modulating properties [239–244] and neuroleptic treatment may be synergized by addition of anti-inflammatory drugs .
It may well be that the environmental components of psychiatric illness such as schizophrenia are relatively minor, ubiquitous, or chance events [246, 247] that have the potential to stimulate the inflammatory systems. However, the nature of the insults may be less important than individuals' genetically influenced and idiosyncratic responses to the insults, similar to individuals with FMF who have an exaggerated inflammatory response. Thus, the genetic components of the inherited predisposition to mental illness may lie "upstream" in the immune system rather than in the CNS per se. The possibility that the environmental agents may be nearly universal (e.g. who has not had a strep throat or viral syndrome?), will mean that the prevalence of the etiological factor will be similar in control and experimental groups thus making it too easy to dismiss key environmental factors in null hypothesis designs [47, 248]. Rather than focus on the environmental contributors that could be non-specific and ubiquitous, it will be more productive to look for genotypes that respond abnormally to triggers of inflammation and microvascular dysfunction (cf). These individuals would be the ones who are at high risk for psychiatric illness. However, the inflammatory processes involve a cascade of steps involving many genes. But this, too, fits with the polygenic features of schizophrenia . Identification of high-risk individuals, combined with such tools as immunizations or anti-inflammatory agents may promote prevention of much psychiatric morbidity. Already, the cytokine regulator and vascular growth factor erythropoietin is suggested as a possible neuroprotective factor in schizophrenia 
The speculations about psychoses developing from vascular/inflammatory processes provide direction for future research across many domains. In addition to pursuing direct evidence of altered activities in inflammatory/immune systems in people with psychoses, the inflammatory/vascular theory has implications for epidemiology, genetics, neuroimaging and neuropathology. For the epidemiologist, the challenge will be to detect relatively small signals against a very noisy background. We hypothesize that the triggers for inflammation can be many and varied and are common factors in the environment. Imagine starting with the clinical syndrome of Sydenham chorea and comparing the rates of strep throat in those affected vs. comparison sample of people without Sydenham chorea. Null hypothesis testing with small sample sizes and nearly ubiquitous etiological agents are clearly not adequate. A second epidemiological challenge is to cast a broad enough net to capture the wide variety of possible contributing factors. Rather than taking a one by one approach to exploring the etiological contributions of, say, virus titers, anoxia, physical trauma, the epidemiologist should look for any and all. It would be predicted that individuals with multiple "hits" (e.g. in utero exposure to virus and low Apgar scores and childhood head trauma) would be at greater risk than those exposed to just one event. If in utero inflammatory processes are active in the genesis of schizophrenia we would also predict an increased rate of fetal deaths in families of schizophrenic probands. A third epidemiological opportunity lies in the search for non-psychiatric inflammatory-related disease or traits in people with psychosis. If something is askew in the inflammatory process in schizophrenia, the effects will show up in other parts of the body. Though requiring replication, the association of psychosis with hemolytic anemia in lupus  provides an illustrative example. In addition to rheumatoid arthritis, the associations of diabetes and cancer have been explored in schizophrenia; one of is exploring rheumatic heart disease . Population-based health registries should be used in a search for co-morbid physical illness.
For geneticists, the proposed theory obviously points to linkage/association studies using inflammation genes; a few examples were cited previously [236–238]. A simple step with extant data might start with a meta analysis defining chromosomal "hot spots" for linkage with schizophrenia and search the gnome maps for immune regulators at these sites as Moises, et al  have done for glial growth regulators. Family, twin, and adoption methodologies can all be applied to the issue of co-morbid or co-segregating physical conditions.
The inflammatory/vascular theory has much to suggest to neuroimaging research especially in the realm of reinterpreting regional perturbations in metabolic activity as primary disturbances of flow regulation rather than intrinsic neuronal metabolic abnormalities. It would be interesting to assess the impact of vasoactive compounds and inflammatory modulators on neuroimaging studies of regional blood flow. Likewise, further pursuit of neuroimaging evidence of disrupted blood brain barrier, as initiated by Dysken, et al , and with manipulation of inflammatory systems as suggested by Mueller and Ackenheil  would test our hypothesis.
The neuropathology of schizophrenia, focused mostly on the neurons, is notable for inconsistencies in findings (see [51, 254] for reviews). Such inconsistency is exactly what would be predicted by an inflammatory/vascular theory where the lesions are truly functional in the sense that the function of the brain alters in relation to perturbations in blood flow regulation. Only the more prolonged and serious inflammation will leave visible traces of neuronal damage and such damage may be patchy and inconsistent from one patient to another. However, over the early years of CNS development, alterations in cellular organization or migration may result from disrupted angiogensis that must go hand in hand with neuronal and glial development. The location and extent of CNS change will be a function of severity of inflammation and timing during development. Such consequences will be hard to demonstrate in human post-mortem tissues and animal or in vitro models may be more fruitful areas for study the effects of inflammation on neurogenesis and blood flow regulation. To our knowledge, human post mortem studies have not utilized vascular cast methodology and this should be considered, perhaps casting one half of a specimen brain while subjecting the other half to cellular analysis.
Because of our interests and expertise, we have focused our attention on schizophrenia as the behavioral phenotype resulting from inflammatory-vascular pathology but the theory presented here is likely to be more general. Indeed, our use of examples of psychoses associated with known inflammatory- vascular pathologies (e.g. autoimmune CNS vascular disease or infectious CNS vascular disease as seen in syphilis) makes it clear that a vascular-inflammatory theory may apply to a wide range of psychotic conditions that may also include psychoses associated with mood disorders. Whereas, the classical genetic studies support the separateness of schizophrenia and mood disorders , there are modern molecular signs that schizophrenia and mood disorders share genetic elements in common [256, 257]. Furthermore, mood disorders, like schizophrenia, show evidence of frontal lobe pathology, enlarged ventricles, abnormal cerebral blood flow [33, 258] and vascular abnormalities . To what extent all of these changes are epiphenomena of being psychotic (treatment effects or stress, etc) remain debatable .
However, finding similar brain changes in a variety of psychotic conditions does not necessarily mean these changes are epiphenomena. Examples from neuropsychiatry teach us that the underlying pathology does not necessarily define the behavioral symptoms. Thus, psychoses with Huntington disease may be affective-like or schizophreniform. Similar pathophysiological mechanisms may underlie a variety of psychotic phenotypes. The evolution of behavioral symptoms for any given pathophysiology may depend on a variety of moderating variables such as an individual's developmental age when the disease process begins, gender, hormones, genetic 'landscape' upon which the disease process unfolds, along with the nature, frequency, and intensity of successive triggers of inflammatory response.
A broad spectrum of observations leads to a working hypothesis that schizophrenia and, possibly, other psychiatric syndromes are the result of genetically mediated inflammatory reactions that damage the neuron-glial-capillary triad with resultant loss of ability to fine tune regional brain metabolism. This hypothesis incorporates genetic, epigenetic , and environmental factors. Furthermore, an inflammatory/vascular theory can explain the variety of behavioral symptoms seen in schizophrenia, the variable course of the illness, and the numerous other puzzling observations such as an excess of minor physical anomalies. Should this theory prove heuristic, it would point to the use of inflammatory modulators in treating the illness. Perhaps more importantly, identifying individuals who were at high risk for the disorder in high genetic risk families as well as the general population, because of abnormalities of their inflammatory systems, holds hope for prevention through early intervention using inflammatory modulators.
List of abbreviations
attention deficit hyperactivity disorder
brain derived neurotropic factor
cerebral blood flow
central nervous system
familial Mediterranean fever
nerve growth factor
pediatric autoimmune neurological disorder associated with strep.
rheumatic heart disease
vascular endothelial growth factor
This work was supported by a grant to DRH from The Stanley Medical Research Institute. We gratefully express our appreciation for the important suggestions by N. Mueller and H. K. Manji in their reviews of an earlier version of this manuscript. All remaining deficiencies remain the responsibility of the authors.
- Faust D: The Limits of Scientific Reasoning. 1984, Minneapolis: University of Minnesota PressGoogle Scholar
- Wicker A: Getting out of our conceptual ruts: strategies for expanding conceptual frameworks. Am Psychol. 1985, 40: 1094-1103. 10.1037//0003-066X.40.10.1094.Google Scholar
- Gottesman II, Shields J, Hanson DR: Schizophrenia: the epigenetic puzzle. 1982, Cambridge: Cambridge University PressGoogle Scholar
- Manji H, Gottesman II, Gould T: Signal transduction and genes-to-behaviors pathways in psychiatric diseases. Sci STKE. 2004, 207: Pe49-Google Scholar
- Petronis A: The origin of schizophrenia: Genetic thesis, epigenetic antithesis, and resolving synthesis. Biol Psychiatry. 2004, 55: 142-146. 10.1016/j.biopsych.2004.02.005.Google Scholar
- Weinberger D, McClure R: Neurotoxicity, neuroplasticity, and magnetic resonance imaging morphometry: what is happening in the schizophrenic brain?. Arch Gen Psychiatry. 2002, 59: 553-558. 10.1001/archpsyc.59.6.553.PubMedGoogle Scholar
- Matthew A, Murray R: Schizophrenia: a neurodevelopmental or neurodegenerative disorder?. Curr Opin Psychiatry. 2002, 15: 9-15. 10.1097/00001504-200201000-00003.Google Scholar
- Lewis D, Levitt P: Schizophrenia as a disorder of neurodevelopment. Ann Rev Neurosci. 2002, 25: 409-432. 10.1146/annurev.neuro.25.112701.142754.PubMedGoogle Scholar
- Church S, Cotter D, Bramon E, Murray R: Does schizophrenia result from developmental or degenerative processes?. J Neural Transm Suppl. 2002, 63: 129-147.PubMedGoogle Scholar
- McGrath J, Feron F, Burne T, Mackay-Sim A, Eyles D: The neurodevelopmental hypothesis of schizophrenia: a review of recent developments. Ann Med. 2003, 35: 86-93. 10.1080/07853890310010005.PubMedGoogle Scholar
- Korenberg J, Kawashima H, Pulst S, Allen L, Magenis E, Epstein C: Down syndrome: toward a molecular definition of the phenotype. Am J Med Genet Suppl. 1990, 7: 91-97.PubMedGoogle Scholar
- Opitz J, Gilbert-Barness E: Reflections on the pathogenesis of Down syndrome. Am J Hum Genet Suppl. 1990, 7: 38-51.Google Scholar
- Head E, Lott I: Down syndrome and beta-amyloid deposition. Curr Opin Neurol. 2004, 17: 95-100. 10.1097/00019052-200404000-00003.PubMedGoogle Scholar
- Bleuler E: Dementia Praecox or the Group of Schizophrenias. 1911, New York: International University PressGoogle Scholar
- Kraepelin E: Dementia Praecox and Paraphrenia. 1919, Edinburgh: E & S LivingstonGoogle Scholar
- Kim-Cohen J, Caspi A, Moffitt TE, Harrington H, Milne BJ, Poulton R: Prior juvenile diagnoses in adults with mental disorder. Arch Gen Psychiatry. 2003, 60: 709-717. 10.1001/archpsyc.60.7.709.PubMedGoogle Scholar
- Erlenmeyer-Kimling L: Neurobehavioral deficits in offspring of schizophrenic parents. Am J Med Genet. 2000, 97: 65-71. 10.1002/(SICI)1096-8628(200021)97:1<65::AID-AJMG9>3.0.CO;2-V.PubMedGoogle Scholar
- Niemi L, Suvisaari J, Tuulio-Henriksson A, Lonnqvist J: Childhood developmental abnormalities in schizophrenia: evidence from high risk studies. Schizophr Res. 2003, 60: 239-258. 10.1016/S0920-9964(02)00234-7.PubMedGoogle Scholar
- Erlenmeyer-Kimling L, Roberts S, Rock D: Longitudinal prediction of schizophrenia in a prospective high-risk study. Behavior Genetic Principles: Perspectives in Development, Personality, and Psychopathology. Edited by: DiLalla LF. 2004, Washington, D.C.: American Psychological Association, 135-144.Google Scholar
- Hanson DR, Gottesman II: The genetics, if any, of infantile autism and childhood schizophrenia. J Autism Child Schizophr. 1976, 6: 209-234.PubMedGoogle Scholar
- Slater E, Cowie V: The Genetics of Mental Disorders. 1971, London: Oxford University PressGoogle Scholar
- Cosway R, Byrne M, Clafferty R, Hodges A, Grant E, Abukmeil S, Lawrie S, Miller P, Johnstone E: Neuropsychological change in young people at high risk for schizophrenia: results from the fist two neuropsychological assessments of the Edinburgh High Risk Study. Psychol Med. 2000, 30: 1111-1121. 10.1017/S0033291799002585.PubMedGoogle Scholar
- Gunnell D, Harrison G, Rasmussen F, Fouskakis D, Tynelius P: Association between premorbid intellectual performance, early life exposures and early-onset schizophrenia. Br J Psychiatry. 2002, 181: 298-305. 10.1192/bjp.181.4.298.PubMedGoogle Scholar
- Friedman J, Harvey P, Coleman T, Moriarty P, Bowie C, Parrella M, white L, Adler D, Davis K: Six-year follow-up study of cognitive and functional status across the lifespan in schizophrenia: a comparison with Alzheimer's disease and normal aging. Am J Psychiatry. 2001, 158: 1441-1448. 10.1176/appi.ajp.158.9.1441.PubMedGoogle Scholar
- Zammit S, Allebeck P, David A, Dlaman C, Hemmingsson T, Lundberg I, Lewis G: A longitudinal study of premorbid IQ score and risk of developing schizophrenia, bipolar disorder, severe depression, and other nonaffective psychoses. Arch Gen Psychiatry. 2004, 61: 354-360. 10.1001/archpsyc.61.4.354.PubMedGoogle Scholar
- Keri S, Janka Z: Critical evaluation of cognitive dysfunctions as endophenotypes of schizophrenia. Acta Psychiatr Scand. 2004, 110: 83-91. 10.1111/j.1600-0047.2004.00359.x.PubMedGoogle Scholar
- Keller A, Castellanos F, Vaituzis A, Jeffries N, Giedd J, Rapoport J: Progressive loss of cerebellar volume in childhood-onset schizophrenia. Am J Psychiatry. 2003, 160: 128-133. 10.1176/appi.ajp.160.1.128.PubMedGoogle Scholar
- Mathalon D, Sullivan E, Lim K, Pfefferbaum A: Progressive brain volume changes and the clinical course of schizophrenia. Arch Gen Psychiatry. 2001, 58: 148-157. 10.1001/archpsyc.58.2.148.PubMedGoogle Scholar
- Niznikiewicz M, Kubicki M, Shenton M: Recent structural and functional imaging findings in schizophrenia. Curr Opin Psychiatry. 2003, 16: 123-147. 10.1097/00001504-200303000-00002.Google Scholar
- Stevens J: Anatomy of schizophrenia revisited. Schizophr Bull. 1997, 23: 373-383.PubMedGoogle Scholar
- Garey L, Ong W, Patel T, Kanani M, Davis A, Mortimer A, Barnes T, Hirsch S: Reduced dendritic spine density on cerebral cortical pyramidal neurons in schizophrenia. J Neurol Neurosurg Psychiatry. 1998, 65: 446-453.PubMedPubMed CentralGoogle Scholar
- Senitz D, Winkelmann E: Neuronal strukturanormalitat im orbito-frontalen cortex bei schizophrenien. J Hirnforsch. 1991, 32: 149-158.PubMedGoogle Scholar
- Picchini A, Manji H, Gould T: GSK-3 and neurotropic signaling: novel targets underlying the pathophysioplogy and treatment of mood disorders?. Drug Discovery Today: Disease Mechanisms. 2004, 1: 419-428. 10.1016/j.ddmec.2004.11.020.Google Scholar
- Cotter D, Pariante C, Everall I: Glial cell abnormalities in major psychiatric disorders: the evidence and implications. Brain Res Bull. 2001, 55: 589-595. 10.1016/S0361-9230(01)00527-5.Google Scholar
- Rosenthal D: The Genain Quadruplets: A Case Study and Theoretical Analysis of Heredity and Environment in Schizophrenia. 1963, New York: Basic BooksGoogle Scholar
- Bleuler M: The Schizophrenic Disorders: Long-term Patient and Family Studies. 1978, New Haven: Yale University PressGoogle Scholar
- Schiffman J, Ekstrom M, La Brie J, Schulsinger F, Sorensen H, Mednick S: Minor physical anomalies and schizophrenia spectrum disorders: a prospective investigation. Am J Psychiatry. 2002, 159: 238-243. 10.1176/appi.ajp.159.2.238.PubMedGoogle Scholar
- McNeil TF, Cantor-Graae E: Minor physical anomalies and obstetric complication in schizophrenia. Aust N Z J Psychiatry. 2000, 34: S65-73. 10.1046/j.1440-1614.2000.00784.x.PubMedGoogle Scholar
- Hata K, Iida J, Iwasaka H, Negoro H, Kishimoto T: Association between minor physical anomalies and lateral ventricular enlargement in childhood and adolescent schizophrenia. Acta Psychiatr Scand. 2003, 108: 147-151. 10.1034/j.1600-0447.2003.00116.x.PubMedGoogle Scholar
- Guy J, Majorski L, Wallace C, Guy M: The incidence of minor physical anomalies in adult male schizophrenics. Schizophr Bull. 1983, 9: 571-582.PubMedGoogle Scholar
- Buckley P: The clinical stigmata of aberrant neurodevelopment in schizophrenia. J Nerv Ment Dis. 1998, 186: 79-86. 10.1097/00005053-199802000-00003.PubMedGoogle Scholar
- Hennesy R, Lane A, Kinsella A, Larkin C, O'Callaghan E, Waddington J: 3D morphometrics of craniofacial dysmorphology reveals sex-specific asymmetries in schizophrenia. Schizophr Res. 2004, 67: 261-268. 10.1016/j.schres.2003.08.003.Google Scholar
- Maricq H: Capillary pattern in familial schizophrenics: a study of nailfold capillaries. Circulation. 1963, 27: 406-413.Google Scholar
- Curtis CE, Iacono WG, Beiser M: Relationships between nailfold plexus visibility and clinical, neuropsychological, and brain structural measures in schizophrenia. Biol Psychiatry. 1999, 46: 102-109. 10.1016/S0006-3223(98)00363-1.PubMedGoogle Scholar
- Vinogradov S, Gottesman II, Moises HW, Nicol S: Negative association between schizophrenia and rheumatoid arthritis. Schizophr Bull. 1991, 17: 669-678.PubMedGoogle Scholar
- Cardno A, Gottesman II: Twin studies of schizophrenia: from bow-and-arrow concordance to Star Wars Mx and functional genomics. Am J Med Genet. 2000, 97: 12-17.PubMedGoogle Scholar
- Hanson DR: Getting the bugs into our genetic theories of schizophrenia. Behavior Genetic Principals Perspectives in Development, Personality, and Psychopathology. Edited by: DiLalla L. 2004, Washington, D.C.: American Psychiatric Press, 205-216.Google Scholar
- Meehl P: Specific etiology and other forms of strong influence: Some quantitative meanings. J Med and Philos. 1977, 2: 33-53.Google Scholar
- Yolken RH, Torrey EF: Viruses, schizophrenia, and bipolar disorder. Clin Microbiol Rev. 1995, 8: 131-145.PubMedPubMed CentralGoogle Scholar
- Yolken RH, Karlsson H, Yee F, Torrey EF: Endogenous retroviruses and schizophrenia. Brain Res Rev. 2000, 31: 193-199. 10.1016/S0165-0173(99)00037-5.PubMedGoogle Scholar
- Harrison P: The neuropathology of schizophrenia: A critical review of the data and their interpretation. Brain. 1999, 122: 593-624. 10.1093/brain/122.4.593.PubMedGoogle Scholar
- Rothermundt M, Arolt V, Bayer T: Review of immunological and immunopathological finding in schizophrenia. Brain Behav Immun. 2001, 15: 319-339. 10.1006/brbi.2001.0648.PubMedGoogle Scholar
- Rothermundt M, Peters M, Prehn J, Arolt V: S100B in brain damage and neurodegeneration. Microsc Res Tech. 2003, 60: 614-632. 10.1002/jemt.10303.PubMedGoogle Scholar
- Rothermundt M, Ponath G, Arolt V: S100B in schizophrenic psychosis. Int Rev Neurobiol. 2004, 59: 445-470.PubMedGoogle Scholar
- Rothermundt M, Falaki P, Ponath G, Abel S, Burkle H, Diedrich M, Hetzel G, Peters M, Siegmund A, Pedersen A, et al: Glial cell dysfunction in schizophrenia indicate by increased S100B in the CSF. Mol Psychiatry. 2004, 9: 897-899. 10.1038/sj.mp.4001548.PubMedGoogle Scholar
- Pellerin S, Therianos S, Magistretti P: The metabolic function of glial cells. Glial Cell Development. Edited by: Jessen K, Richardson W. 2001, Oxford: Oxford University Press, 91-107. 2Google Scholar
- Kurosinski P, Gotz J: Glial cells under physiologic and pathologic conditions. Arch Neurol. 2002, 59: 1524-1528. 10.1001/archneur.59.10.1524.PubMedGoogle Scholar
- Haydon P: GLIA: listening and talking to the synapse. Nat Rev Neurosci. 2001, 2: 185-193. 10.1038/35058528.PubMedGoogle Scholar
- Coyle J, Schwarcz R: Mind glue: implications of glial cell biology for psychiatry. Arch Gen Psychiatry. 2000, 57: 90-93. 10.1001/archpsyc.57.1.90.PubMedGoogle Scholar
- Zonta M, Angulo M, Gobbo S, Rosengarten B, Hossmann K, Pozzan T, Carmignoto G: Neuron-to-astrocyte signaling is central to dynamic control of brain microcirculation. Nat Neurosci. 2003, 6: 43-50. 10.1038/nn980.PubMedGoogle Scholar
- Medhora M, Narayanan J, Harder D: Dual regulation of the cerebral microvasculature by epoxyeicosatrienoic acids. Trends Cardiovasc Med. 2001, 11: 38-42. 10.1016/S1050-1738(01)00082-2.PubMedGoogle Scholar
- Abott N: Astrocyte-endothelial interactions and blood-brain permeability. J Anatomy. 2002, 200: 629-638. 10.1046/j.1469-7580.2002.00064.x.Google Scholar
- Virgintino D, Robertson D, Errede M, Benagiano V, Tauer U, Roncali L, Bertossi M: Expression of caveolin-1 in human brain microvessels. Neuroscience. 2002, 115: 145-152. 10.1016/S0306-4522(02)00374-3.PubMedGoogle Scholar
- Paulson O: Blood-brain barrier, brain metabolism and cerebral blood flow. Eur Neuropsychopharmacol. 2002, 12: 465-501. 10.1016/S0924-977X(02)00098-6.Google Scholar
- Yoder E: Modifications in astrocyte morphology and calcium signaling induced by a brain capillary endothelial cell line. Glia. 2002, 38: 137-145. 10.1002/glia.10016.PubMedGoogle Scholar
- Gallo V, Ghiani C, Yuan X: The role of ion channels and neurotransmitter receptors in glial cell development. Glial Cell Development. Edited by: Jessen K, Richardson W. 2001, Oxford: Oxford University Press, 110-130. 2Google Scholar
- Harder D, Zhang C, Gebremedhin D: Astrocytes function in matching blood flow to metabolic activity. News Physiol Sci. 2002, 17: 27-31.PubMedGoogle Scholar
- Cohen Z, Bouchelet I, Olivier A, Villemure J, Ball R, Stanimirovic D, Hamel E: Multiple microvascular and astroglial 5-hydroxytryptamine receptor subtypes in human brain: molecular and pharmacologic characterization. J Cereb Blood Flow Metab. 1999, 19: 908-917. 10.1097/00004647-199908000-00010.PubMedGoogle Scholar
- Elhusseiny A, Cohen Z, Olivier A, Stanimirovic D, Hamel E: Functional acetylcholine muscarinic receptor subtypes in human brain microcirculation: identification and cellular localization. J Cereb Blood Flow Metab. 1999, 19: 794-802. 10.1097/00004647-199907000-00010.PubMedGoogle Scholar
- Favard C, Simon A, Vigny A, Nguyen-Legros J: Ultrastructural evidence for a close relationship between dopamine cell process and blood capillary walls in Macaca monkey and rat retina. Brain Res. 1990, 523: 127-133. 10.1016/0006-8993(90)91645-W.PubMedGoogle Scholar
- Bacic F, Uematsu S, McCarron RM, Spatz M: Dopamine receptors linked to adenylate cyclase in human cerebromicrovascular endothelium. J Neurochem. 1991, 57: 1774-1780.PubMedGoogle Scholar
- Cavaglia M, Dombrowski S, Drazba J, Vasanji A, Bokesch P, Janigro D: Regional variation in brain capillary density and vascular response to ischemia. Brain Res. 2001, 910: 81-93. 10.1016/S0006-8993(01)02637-3.PubMedGoogle Scholar
- Harrison R, Harel N, Panesar J, Mount R: Blood capillary distribution correlates with hemodynamic-based functional imaging in cerebral cortex. Cereb Cortex. 2002, 12: 225-233. 10.1093/cercor/12.3.225.PubMedGoogle Scholar
- Risau W, Esser S, Engelhardt B: Differentiation of blood-brain barrier endothelial cells. Pathol Biol. 1998, 46: 171-175.PubMedGoogle Scholar
- Sasaki R: Pleiotropic functions of erythropoietin. Intern Med. 2003, 42: 142-149.PubMedGoogle Scholar
- Shusta EV, Boado RJ, Mathern GW, Pardridge WM: Vascular genomics of the human brain. J Cereb Blood Flow Metab. 2002, 22: 245-252. 10.1097/00004647-200203000-00001.PubMedGoogle Scholar
- Virgintino D, Errede M, Robertson D, Girolamo F, Masciandaro A, Bertossi M: VEGF expression is developmentally regulated during brain angiogenesis. Histochem Cell Biol. 2003, 119: 227-232.PubMedGoogle Scholar
- Schiera G, Bono E, Raffa MP, Gallo A, Pitarresi GL, Di Liegro I, Savett G: Synergistic effects of neurons and astrocytes on the differentiation of brain capillary endothelial cells in culture. J Cell Mol Med. 2003, 7: 165-170.PubMedGoogle Scholar
- Zhang C, Harder DR: Cerebral capillary endothelial cell mitogenesis and morphogenesis induced by astrocyte epoxyeicosartrienoic acid. Stroke. 2002, 33: 2957-2964. 10.1161/01.STR.0000037787.07479.9A.PubMedGoogle Scholar
- Lee SW, Kim WJ, Choi YK, Song HS, Son MJ, Gelman IH, Kim YJ, Kim K: SSeCKS regulates angiogenesis and tight junction formation in the blood-brain barrier. Nat Med. 2003, 9: 828-829. 10.1038/nm0703-828.Google Scholar
- Senitz D, Benninghoff J: Histomorphology of angiogenesis in human perinatal orbitofrontal cortex: a Golgi and electron microscopic study of anastomosis formation. Anat Embryol. 2003, 206: 479-485.PubMedGoogle Scholar
- Richter T, Ronald P: The evolution of disease resistant genes. Plant Mol Biol. 2000, 42: 195-204. 10.1023/A:1006388223475.PubMedGoogle Scholar
- Mackenzie K, Bishop S: Utilizing stochastic genetic epidemiological models to quantify the impact of selection for resistance to infectious diesease in domestic livestock. J Anim Sci. 2001, 79: 2057-2065.PubMedGoogle Scholar
- Kallmann FJ, Reisner D: Twin studies on the genetic variation in resistance to tuberculosis. J Hered. 1943, 34: 293-301.Google Scholar
- Werneck-Barroso E: Innate resistance to tuberculosis: revisiting Max Lurie genetic experiments in rabbits. Int J Tuberc Lung Dis. 1999, 3: 166-168.PubMedGoogle Scholar
- McGue M, Gottesman II, Rao DC: The transmission of schizophrenia under a multifactorial threshold model. Am J Hum Genet. 1983, 35: 1161-1178.PubMedPubMed CentralGoogle Scholar
- Bion JF, Brun-Buisson C: Introduction – infection and critical illness: genetic and environmental aspects of susceptibility and resistance. Intensive Care Med. 2000, S1-S2. Supplement 1
- Burt RA: Genetics of host response to malaria. Int J Parasitol. 1999, 29: 973-979. 10.1016/S0020-7519(99)00054-5.PubMedGoogle Scholar
- Hawken RJ, Beattie CW, Schook LB: Resolving the genetics of resistance to infectious diseases. Rev Sci Tech. 1998, 17: 17-25.PubMedGoogle Scholar
- Hill AV: Genetics of infectious disease resistance. Curr Opin Genet Dev. 1996, 6: 348-353. 10.1016/S0959-437X(96)80013-X.PubMedGoogle Scholar
- Hill AV: Genetics and genomics of infectious disease susceptibility. Br Med Bull. 1999, 55: 401-413. 10.1258/0007142991902457.PubMedGoogle Scholar
- Seymour RM: Some aspects of the coevolution of virulence and resistance in contact transmission processes with ecological constraints. IMA J Math Appl Med Biol. 1995, 12: 83-136.PubMedGoogle Scholar
- Kitagawa M, Aizawa S, Ikeda H, Hirokawa W: Establishment of a therapeutic model for retroviral infection using the genetic resistance mechanism of the host. Pathol Int. 1996, 46: 719-725.PubMedGoogle Scholar
- Smith DA, Germolec DR: Introduction of immunology and autoimmunity. Environ Health Perspect. 1999, 107: 661-665.PubMedPubMed CentralGoogle Scholar
- Blackwell JM: Genetics and genomics of infectious disease susceptibility. Trends Mol Med. 2001, 7: 521-526. 10.1016/S1471-4914(01)02169-4.PubMedGoogle Scholar
- Knight J: Polymorphisms in tumor necrosis factor and other cytokines as risks for infectious disease and the septic shock syndrome. Curr Infect Dis Rep. 2001, 3: 427-439.PubMedGoogle Scholar
- Cook GS, Hill AV: Genetics of susceptibility to human infectious disease. Nat Rev Genet. 2001, 2: 967-977. 10.1038/35103577.Google Scholar
- Beskow AH, Gyllensten UB: Host genetic control of HPV 16 titer in carcinoma in situ of the cervix uteri. Int J Cancer. 2002, 101: 526-531. 10.1002/ijc.90010.PubMedGoogle Scholar
- Wang FS: Current status and prospects of studies on human genetic alleles associated with hepatitis B virus infection. World J Gastroenterol. 2003, 9: 641-644.PubMedPubMed CentralGoogle Scholar
- Touitou I: The spectrum of Familial Mediterranean Fever (FMF) mutations. Eur J Hum Genet. 2001, 473-483. 10.1038/sj.ejhg.5200658.Google Scholar
- Scholl P: Periodic fever syndromes. Curr Opin Pediatr. 2000, 12: 563-566. 10.1097/00008480-200012000-00009.PubMedGoogle Scholar
- Ozen S: Vasculopathy, Bechets Syndrome and familial Mediterranean fever. Curr Opin Rheumatol. 1999, 11: 393-398. 10.1097/00002281-199909000-00011.PubMedGoogle Scholar
- Tutar E, Akar N, Atalay S, Yilmaz E, Akar E, Yalcinkaya F: Familial Mediterranean fever gene (MEFV) mutations in patients with rheumatic heart disease. Heart. 2002, 87: 568-569.PubMedPubMed CentralGoogle Scholar
- Veasy LG, Hill HR: Immunologic and clinical correlations in rheumatic fever and rheumatic heart disease. Pediatr Infect Dis J. 1997, 16: 400-407. 10.1097/00006454-199704000-00012.PubMedGoogle Scholar
- Yegin O, Coskun M, Ertug H: Cytokines in acute rheumatic fever. Eur J Pediatr. 1997, 156: 25-29.PubMedGoogle Scholar
- Shore P, Jackson E, Wisniewski S, Clark R, Adelson P, Kochanek P: Vascular endothelial growth factor is increased in cerebrospinal fluid after traumatic brain injury in infants and children. Neurosurgery. 2004, 54: 605-611. 10.1227/01.NEU.0000108642.88724.DB.PubMedGoogle Scholar
- Curristin S, Cao A, Stewart W, Zhang H, Madri J, Morrow J, Ment L: Disrupted synaptic development in the hypoxic newborn brain. Proc Natl Acad Sci USA. 2002, 99: 15729-15734. 10.1073/pnas.232568799.PubMedPubMed CentralGoogle Scholar
- Zang W, Smith C, Howlett C, Stanimirovic D: Inflammatory activation of human brain endothelial cells by hypoxic astrocytes in vitro is mediated by IL-1[beta]. J Cereb Blood Flow Metab. 2000, 20: 967-978.Google Scholar
- Dietrich P-Y, Walker P, Saas P: Death receptors on reactive astrocytes: a key role in the fine tuning of brain inflammation. Neurology. 2003, 60: 548-554.PubMedGoogle Scholar
- Meeuwsen S, Persoon-Dean C, Bsibis M, Ravid R, Van Noort J: Cytokine, chemokine, and growth factor gene profiling of cultured human astrocytes after exposure to proinflammatory stimuli. Glia. 2003, 43: 243-253. 10.1002/glia.10259.PubMedGoogle Scholar
- Croitoru-Lamoury J, Guillemin G, Boussin F, Mognetti B, Gigout L, Cheret A, Vaslin B, LeGrand R, Brew B, Dormont D: Expression of chemokines and their receptors in human and simian astrocytes: evidence for a central role of TNFα and IFNγ in CXCR4 and CCR5 modulation. Glia. 2003, 41: 354-370. 10.1002/glia.10181.PubMedGoogle Scholar
- Rubenstein G: Schizophrenia, rheumatoid arthritis and natural disease resistance. Schizophr Res. 1997, 25: 177-181.Google Scholar
- Morris JA: Schizophrenia, bacterial toxins and the genetics of redundancy. Med Hypotheses. 1996, 46: 362-366.PubMedGoogle Scholar
- Munk-Jorgensen P, Ewald H: Epidemiology in neurobiological research: exemplified by the influenza-schizophrenia story. Br J Psychiatry Suppl. 2001, 40: S30-S32. 10.1192/bjp.178.40.s30.PubMedGoogle Scholar
- O'Reilly SL, Singh SM: Retroviruses and schizophrenia revisited. Am J Med Genet. 1996, 67: 19-26. 10.1002/(SICI)1096-8628(19960216)67:1<19::AID-AJMG3>3.0.CO;2-N.PubMedGoogle Scholar
- Torrey EF, Miller J, Rawlings R, Yolken RH: Seasonality of births in schizophrenia and bipolar disorder: A review of the research. Schizophr Res. 1997, 28: 1-38. 10.1016/S0920-9964(97)00092-3.PubMedGoogle Scholar
- Davison K, Bagley C: Schizophrenia-like psychoses associated with organic disorders of the central nervous system: A review of the literature. Current Problems in Neuropsychiatry: Schizophrenia, Epilepsy, the Temporal Lobe. Edited by: Herrington R. 1969, Ashford, Kent, UK: Headley BrothersGoogle Scholar
- Beadles C: On the degenerative lesions of the arterial system in the insane, with remarks upon the nature of the granular ependyma. J Ment Sci. 1895, 41: 32-50.Google Scholar
- Bender L: Psychiatric, neurologic and neuropathologic studies in disseminated alterative arteriolitis. Arch Neurol Psychiatry. 1936, 36: 790-815.Google Scholar
- Hess D: Cerebral lupus vasculopathy. Mechanisms and clinical relevance. Ann NY Acad Sci. 1997, 823: 154-168.PubMedGoogle Scholar
- Lass P, et al: Cerebral blood flow in Sjogren's syndrome using 99Tcm-HMPAO brain SPET. Nucl Med Commun. 2000, 21: 31-35. 10.1097/00006231-200001000-00006.PubMedGoogle Scholar
- Fredericks R, Lefkowitz D, Challa V, Troost B: Cerebral vasculitis associated with cocaine abuse. Stroke. 1991, 22: 1437-1439.PubMedGoogle Scholar
- Shi X, Wu J, Liu Z, Tang J, Su Y: Single photon emission CT perfusion imaging of cerebral blood flow in early syphilis patients. Chin Med J (Engl). 2003, 116: 1051-1054.Google Scholar
- Thomas A, et al: Ischemic basis for deep white matter hyperintensities in major depression. Arch Gen Psychiatry. 2002, 59: 785-792. 10.1001/archpsyc.59.9.785.PubMedGoogle Scholar
- Kronfol Z, Remick DG: Cytokines and the brain: implications for clinical psychiatry. Am J Psychiatry. 2000, 157: 683-694. 10.1176/appi.ajp.157.5.683.PubMedGoogle Scholar
- Wang H, Yu M, Oschanl M, Amella C, Tanovic M, Susarla S, Li J, Wang H, Yang H, Ulloa L, et al: Nicotinic acetylcholine receptor alpha subunit is an essential regulator of inflammation. Nature. 2003, 421: 384-388. 10.1038/nature01339.PubMedGoogle Scholar
- Chorsky R, Yaghamai F, Hill W, Stopa E: Alzheimer's disease: a review concerning immune response and microischemia. Med Hypotheses. 2001, 56: 124-127. 10.1054/mehy.2000.1148.PubMedGoogle Scholar
- Farkas E, De Jong G, Apro E, De Vos R, Steur E, Luiten P: Similar ultrastructural breakdown of cerebrocortical capillaries in Alzheimer's disease, Parkinson's disease, and experimental hypertension. What is the functional link?. Ann N Y Acad Sci. 2000, 903: 72-82.PubMedGoogle Scholar
- Farkas E, Luiten P: Cerebral microvascular pathology in aging and Alzheimer's disease. Prog Neurobiol. 2001, 64: 575-611. 10.1016/S0301-0082(00)00068-X.PubMedGoogle Scholar
- Versijpt J, Van Laere K, Dierckx R, Dumont F, De Deyn P, Slegers G, Korf J: Scintigraphic visualization of inflammation in neurodegenerative disorders. Nucl Med Commun. 2003, 24: 209-221. 10.1097/00006231-200302000-00014.PubMedGoogle Scholar
- Grammas P: A damaged microcirculation contributes to neuronal cell death in Alzheimer's disease. Neurobiol Aging. 2000, 21: 199-205. 10.1016/S0197-4580(00)00102-0.PubMedGoogle Scholar
- de La Torre J: Critically attained threshold of cerebral hypoprofusion: Can it cause Alzheimer's disease?. Ann N Y Acad Sci. 2000, 903: 424-436.PubMedGoogle Scholar
- Preston S, Steart P, Wilkinson A, Nicoll J, Weller R: Capillary and arterial cerebral amyloid angiopathy in Alzheimer's disease: defining the perivascular route for the elimination of amyloid [beta] from the human brain. Neuropathol Appl Neurobiol. 2003, 29: 106-117. 10.1046/j.1365-2990.2003.00424.x.PubMedGoogle Scholar
- Borroni B, Akkawi N, Martini G, Colciaghi F, Prometti P, Rozzinin L, Di Luca M, Lenzi G, Romanelli G, Caimi L, et al: Microvascular damage and platelet abnormalities in early Alzheimer's disease. J Neurol Sci. 2002, 203–204: 189-193. 10.1016/S0022-510X(02)00289-7.PubMedGoogle Scholar
- Vagnucci AHJ, Li WW: Alzheimer's disease and angiogenesis. Lancet. 2003, 361: 605-608. 10.1016/S0140-6736(03)12521-4.PubMedGoogle Scholar
- Gibson C, MacLennan A, Goldwater P, Dekker G: Antenatal causes of cerebral palsy: associations between inherited thrombophilias, viral and bacterial infection, and inherited susceptibility to infection. Obstet Gynecol Surv. 2003, 58: 209-220. 10.1097/00006254-200303000-00024.PubMedGoogle Scholar
- Lee Y, Henning B, Yao J, Toborek M: Methamphetamine induces AP-1 and NF-kappaB binding and transactivation in human brain endothelial cells. J Neurosci Res. 2001, 66: 583-591. 10.1002/jnr.1248.PubMedGoogle Scholar
- Lignelli G, Buchheit W: Angitis in drug abusers. N Engl J Med. 1971, 284: 112-113.Google Scholar
- Rumbaugh C, Bergeron R, Fang H, McCormik R: Cerebral angiographic changes in the drug abuse patient. Radiology. 1971, 101: 335-344.PubMedGoogle Scholar
- Citron B, Halpern M, McCarron M, Lundberg G, McCormick R, Pincus I, Tatter D, Haverback B: Necrotizing angitis associate with drug abuse. N Engl J Med. 1970, 283: 1003-1011.PubMedGoogle Scholar
- Behzadian MA, Wang XL, Shabrawey M, Caldwell RB: Effects of hypoxia on glial cell expression of angiogenesis-regulating factors VEGF and TGF-beta. Glia. 1998, 24: 216-225.PubMedGoogle Scholar
- Dammann O, Leviton A: Brain damage in preterm newborns: might enhancement of developmentally regulated endogenous protection open the door for prevention?. Pediatrics. 1999, 104: 541-550. 10.1542/peds.104.3.541.PubMedGoogle Scholar
- Molinero A, Penkowa M, Hernandez J, Camats J, Giralt M, Lago N, Carrasco J, Campbell IL: Matallothionein-I over expression decreased brain pathology in transgenic mice with astrocyte-targeted expression of interleukin-g. J Neuropathol Exp Neurol. 2003, 62: 315-328.PubMedGoogle Scholar
- Proescholdt MA, Heiss JD, Walbridge S, Muhlhauser J, Capogrossi MC, Oldfield EH, Merrill MJ: Vascular endothelial growth factor (VEGF) modulates vascular permeability and inflammation in rat brain. J Neuropathol Exp Neurol. 1999, 58: 613-627.PubMedGoogle Scholar
- Penkowa M, Carrasco J, Giralt M, Molinero A, Hernandez J, Campbell IL, Hidalgo J: Altered central nervous system cytokine-growth factor expression profiles and angiogenesis in metallotioein-I=II deficient mice. J Cereb Blood Flow Metab. 2000, 20: 1174-1189. 10.1097/00004647-200008000-00003.PubMedGoogle Scholar
- Kirk SL, Karlik SJ: VEGF and vascular changes in chronic neuroinflammation. J Autoimmun. 2003, 21: 353-363. 10.1016/S0896-8411(03)00139-2.PubMedGoogle Scholar
- Olsen NV: Central nervous system frontiers for the use of erythropoietin. Clin Infect Dis. 2003, 37: S323-S330. 10.1086/376912.PubMedGoogle Scholar
- Yang RB, Ng CK, Wasserman SM, Colman SD, Shenoy S, Mehraban F, Komuves LG, Tomlinson JE, Topper JN: Identification of a novel family of cell-surface proteins expressed in human vascular endothelium. J Biol Chem. 2002, 277: 46364-46373. 10.1074/jbc.M207410200.PubMedGoogle Scholar
- Cannon M, Jones P, Murray RM: Obstetric complications and schizophrenia: Historical and meta-analytic review. Am J Psychiatry. 2002, 159: 1080-1092. 10.1176/appi.ajp.159.7.1080.PubMedGoogle Scholar
- Gilmore J, Jarskog L, Vadlamudi S, Lauder J: Prenatal infection and risk for schizophrenia: IL-Iβ, IL-6, and TNFα inhibit cortical neuron dendrite development. Neuropsychopharmacology. 2004, 29: 1221-1229. 10.1038/sj.npp.1300446.PubMedGoogle Scholar
- Mueller N, Riedel M, Hadjamu M, Schwarz M, Ackenheil M, Gruber R: Increase in expression of adhesion molecule receptors on T helper cells during antipsychotic treatment and relationship to blood-brain barrier permeability in schizophrenia. Am J Psychiatry. 1999, 156: 634-636.Google Scholar
- Kety S, Schmidt C: The nitrous oxide method for the quantitative determination of cerebral blood flow in man: theory, procedure and normal values. J Clin Invest. 1948, 27: 476-483.PubMedPubMed CentralGoogle Scholar
- Kety SS, Woodford RB, Harmel MH, Freyman FA, Appel KE, Schmidt CF: Cerebral blood blow and metabolism in schizophrenia. Am J Psychiatry. 1948, 104: 765-770.PubMedGoogle Scholar
- Williamson P: Hypofrontality in schizophrenia: a review of the evidence. Can J Psychiatry. 1987, 32: 399-404.PubMedGoogle Scholar
- Weinberger DR, Berman KF: Speculation on the meaning of cerebral metabolic hypofrontality in schizophrenia. Schizophr Bull. 1988, 14: 157-168.PubMedGoogle Scholar
- Semkovska M, Bedard MA, Stip E: Hypofrontalite et symptomes nefatifs dans la schizophrenie: syntheses des acquis anatomiques et neuropsychologiques et neuropsychologiques et perspectives ecologiques. Encephale. 2001, 27: 405-415.PubMedGoogle Scholar
- Honey G, Fletcher P, Bullmore E: Functional brain mapping of psychopathology. J Neurol Neurosurg Psychiatry. 2002, 72: 432-439.PubMedPubMed CentralGoogle Scholar
- Hofer A, Weiss E: Advances in the neuroimaging of cognitive functions in schizophrenia. Curr Opin Psychiatry. 2002, 15: 3-7. 10.1097/00001504-200201000-00002.Google Scholar
- Bachneff S: Regional cerebral blood flow in schizophrenia and the local circuit neurons hypothesis. Schizophr Bull. 1996, 22: 163-182.PubMedGoogle Scholar
- Andreasen N, O'Leary D, Flaum M, Nopoulos P, Watkins G, Ponto L, Hichwa R: Hypofrontality in schizophrenia: distributed dysfunctional circuits in neuroleptic-naive patients. Lancet. 1997, 349: 1730-1734. 10.1016/S0140-6736(96)08258-X.PubMedGoogle Scholar
- Barch C, Carter C, Braver T, Sabb F, MacDonald A, Noll D, Cohen J: Selective deficits in prefrontal cortex function in medication-naive patients with schizophrenia. Arch Gen Psychiatry. 2001, 58: 280-288. 10.1001/archpsyc.58.3.280.PubMedGoogle Scholar
- Kim JJ, Mohamed S, Andreasen NC, Oleary DS, Watkins GL, BolesPonto LL, Hichwa RD: Regional neural dysfunctions in chronic schizophrenia studied with positive emission tomography. Am J Psychiatry. 2000, 157: 542-548. 10.1176/appi.ajp.157.4.542.PubMedGoogle Scholar
- Miller D, Rezai K, Alliger R, Andreasen N: The effect of antipsychotic medication on relative cerebral blood perfusion in schizophrenia: assessment with technetium-99m hexamethyl-propyleneamine oxime single photon emission computed tomography. Biol Psychiatry. 1997, 41: 550-559. 10.1016/S0006-3223(96)00110-2.PubMedGoogle Scholar
- Vaiva G, Llorca P, Dupont S, Cottencin O, Devos P, Mazas O, Rascle C, Steinling M, Goudemand M: Spect imaging, clinical features, and cognition before and after low doses of amisulpride in schizophrenic patients with the deficit syndrome. Psychiatry Res. 2002, 115: 37-48.PubMedGoogle Scholar
- Lahti A, Holcomb H, Weiler M, Medoff D, Tamminga C: Functional effects of antipsychotic drugs: comparing clozapine and haloperidol. Biol Psychiatry. 2003, 53: 601-608. 10.1016/S0006-3223(02)01602-5.PubMedGoogle Scholar
- Miller D, Andreasen N, O'Leary D, Watkins G, Boles Ponto L, Hichwa R: Comparison of the effects of risperidone and haloperidol on regional cerebral blood flow in schizophrenia. Biol Psychiatry. 2001, 49: 704-715. 10.1016/S0006-3223(00)01001-5.PubMedGoogle Scholar
- Lahti A, H Holcomb, Medoff D, Weiler M, Tamminga C, Carpenter W: Abnormal patterns of regional cerebral blood flow in schizophrenia with primary negative symptoms during an effortful auditory recognition task. Am J Psychiatry. 2001, 158: 1797-1808. 10.1176/appi.ajp.158.11.1797.PubMedGoogle Scholar
- Vaiva G, Cottencin O, Llorca P, Devos P, Dupont S, Mazas O, Tascle C, Thomas P, Steinling M, Goudemand M: Regional cerebral blood flow in deficit/nondeficit types of schizophrenia according to SDS criteria. Prog Neuropsychopharmacol Biol Psychiatry. 2002, 26: 481-485. 10.1016/S0278-5846(01)00292-5.PubMedGoogle Scholar
- Ashton L, Barnes A, Livingston M, Wyper D: Cingulate abnormalities associated with PANSS negative scores in first episode schizophrenia. Behav Neurol. 2000, 12: 93-101.PubMedGoogle Scholar
- Franck N, O'Leary D, Flaum M, Hichwa R, Andreasen N: Cerebral blood flow changes associated with Schneiderian first-rank symptoms in schizophrenia. J Neuropsychiatry Clin Neurosci. 2002, 14: 277-282.PubMedGoogle Scholar
- Paradiso S, Andreasen N, Crespo-Facorro B, O'Leary D, Watkins G, Boles Ponto L, Hichwa R: Emotions in unmedicated patients with schizophrenia during evaluation with positron emission tomography. Am J Psychiatry. 2003, 160: 1175-1783. 10.1176/appi.ajp.160.10.1775.Google Scholar
- Meyer-Lindberg A, Miletich R, Kohn P, Esposito G, Carson R, Quarantelli M, D W, Berman K: Reduced prefrontal activity predicts exaggerated striatal dopominergic function in schizophrenia. Nat Neurosci. 2002, 5: 267-271. 10.1038/nn804.Google Scholar
- Callicott J, Bertolino A, Mattay V, Langheim F, Duyn J, Coppola R, Goldberg T, Weinberger D: Physiological dysfunction of the dorsolateral prefrontal cortex in schizophrenia revisited. Cereb Cortex. 2000, 10: 1078-1092. 10.1093/cercor/10.11.1078.PubMedGoogle Scholar
- Sabri O, Owega A, Schreckenberger M, Sturz L, Fimm B, Kunert P, Meyer P, Sander D, Klingelhofer J: A truly simultaneous combination of functional transcranial doppler sonography and H2 15O PET adds fundamental new information on differences in cognitive activation between schizophrenics and healthy control subjects. J Nucl Med. 2003, 44: 671-681.PubMedGoogle Scholar
- Busatto GF, Zamignani DR, Buchpiguel CA, Garrido GE, Glabus MF, Rocha ET, Maia AF, Rosario-Campos MC, Campi Castro C, Furuie SS, et al: A voxel-based investigation of regional cerebral blood flow abnormalities in obsessive-compulsive disorder using single photon emission computed tomography (SPECT). Psychiatry Res. 2000, 99: 15-27.PubMedGoogle Scholar
- Lesser IM, Mena I, Boone KB, Miller BL, Mehringer CM, Wohl M: Reduction of cerebral blood flow in older depressed patients. Arch Gen Psychiatry. 1994, 51: 677-686.PubMedGoogle Scholar
- Liotti M, Mayberg HS, McGinnis S, Brannan SL, Jerabek P: Unmasking disease-specific cerebral blood flow abnormalities: Mood challenge in patients with remitted unipolar depression. Am J Psychiatry. 2002, 159: 1830-1840. 10.1176/appi.ajp.159.11.1830.PubMedGoogle Scholar
- Swedo S, et al: High prevalence of obsessive-compulsive symptoms in patients with Sydenham's Chorea. Am J Psychiatry. 1989, 146: 246-249.PubMedGoogle Scholar
- Swedo SE, Leonard HL, Kiessling LS: Speculations on antineuronal antibody-mediated neuropsychiatric disorders of childhood. Pediatrics. 1994, 93: 323-326.PubMedGoogle Scholar
- Asbahr F, Negrao A, Gentil V, Zanetta D, da Paz J, Marques-Dias M, Kiss M: Obsessive compulsive and related syndromes in children and adolescents with rheumatic fever with and without chorea: a prospective 6 month study. Am J Psychiatry. 1998, 155: 1122-1124.PubMedGoogle Scholar
- Garvey MA, Swedo SE: PANDAS: the search for environmental triggers of pediatric neuropsychiatric disorders. Lessons from rheumatic fever. J Child Neurol. 1998, 13: 413-423.PubMedGoogle Scholar
- Bottas A, Richer MA: Pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections (PANDAS). Pediatr Infect Dis J. 2002, 21: 67-71.PubMedGoogle Scholar
- Moore D: Neuropsychiatric aspects of Sydenham's Chorea. J Clin Psychiatry. 1996, 57: 407-414.PubMedGoogle Scholar
- Mercadante M, Busatto GF, Lombroso P, Prado L, Rosario-Campos M, do Valle R, Marques-Dias M, Kiss M, Leckman J, Miguel EC: The psychiatric symptoms of rheumatic fever. Am J Psychiatry. 2000, 157: 2036-2038. 10.1176/appi.ajp.157.12.2036.PubMedGoogle Scholar
- Davison K, Bagley CR: Schizophrenia-like psychoses associated with organic disorders of the central nervous system: A review of the literature. Current Problems in Neuropsychiatry British Journal of Psychiatry Special Publication No. 4. Edited by: Herrington RN. 1969, Ashford, Kent: Headley BrothersGoogle Scholar
- Van Der Horst L: Rheumatism and psychosis. Foli Psychiatr Neurol Neurochir Neerl. 1948, 1/2: 56-54.Google Scholar
- Bruetsch W: The histopathology of the psychoses with subacute bacterial and chronic verrucose rheumatic endocarditis. Amer J Psychiatry. 1938, 95: 335-346.Google Scholar
- Winkelman N, Eckel JL: The brain in acute rheumatic fever. Arch Neurol Psychiatry. 1932, 844-870.Google Scholar
- Dublin W: Pathologic lesions of the brain associated with chronic rheumatic endocarditis and accompanied by psychosis. Dis Nerv Syst. 1941, 390-393.Google Scholar
- Bruetsch W: Rheumatic endarteritis of cerebral vessels: sequel of rheumatic fever. Trans Am Neurol Assoc. 1942, 68: 17-20.Google Scholar
- Van Der Horst L: Rheuma und psychose. Arch Psychiatr Nervenkr. 1949, 181: 325-336.Google Scholar
- Lewis A, Minski L: Chorea and psychosis. Lancet. 1935, 536-538. 10.1016/S0140-6736(01)19452-3.Google Scholar
- Skvortsova E: Clinical neuropsychiatric changes during rheumatism. Klin Med. 1956, 34: 32-25.Google Scholar
- Hammes E: Psychoses associated with Sydenham's Chorea. JAMA. 1922, 79: 804-807.Google Scholar
- Howie D: Some pathological findings in schizophrenics. Am J Psychiatry. 1960, 117: 59-62.PubMedGoogle Scholar
- Shaskan D: Mental changes in chorea minor. Am J Psychiatry. 1938, 95: 193-202.Google Scholar
- Bruetsch W: Chronic rheumatic brain disease as a possible factor in the causation of some cases of dementia praecox. Am J Psychiatry. 1940, 97: 276-296.Google Scholar
- Keeler WR, Bender L: A follow-up study of children with behavior disorders and Sydenham's chorea. Am J Psychiatry. 1952, 169: 421-428.Google Scholar
- Wertheimer N: A psychiatric follow-up of children with rheumatic fever and other chronic diseases. J Chronic Dis. 1963, 16: 223-237. 10.1016/0021-9681(63)90028-6.PubMedGoogle Scholar
- Wilcox J, Nasrallah H: Sydenham's chorea and psychopathology. Neuropsychobiology. 1988, 19: 6-8.PubMedGoogle Scholar
- Guttmann E: On some constitutional aspects of chorea and on its sequelae. Journal of Neurology and Psychopathology. 1936, 17: 16-26.PubMedPubMed CentralGoogle Scholar
- Bruetsch W: Late cerebral sequele of rheumatic fever. Arch Intern Med. 1944, 73: 972-982.Google Scholar
- Wertheimer N: "Rheumatic schizophrenia". Arch Gen Psychiatry. 1961, 4: 579-596.PubMedGoogle Scholar
- Wilcox J, Nasrallah H: Sydenham's chorea and psychosis. Neuropsychobiology. 1986, 15: 13-14.PubMedGoogle Scholar
- Hanson DR: Streptococcal infections and psychoses? A preliminary inquiry. Infectious Diseases and Neuropsychiatric Disorders. Edited by: Fatemi SH. 2005, London: Martin DunitzGoogle Scholar
- Costero I: Cerebral lesions responsible for death of patients with active rheumatic fever. Arch Neurol Psychiatry. 1949, 62: 48-72.PubMedGoogle Scholar
- Bompiani G, Benedetti E, Cecconi D: Arteriopathie cerebrali reumatiche. Arch Ital Anat Istol Pathol. 1954, 28: 1-35.Google Scholar
- Bini L, Giovanni M: Uber den chronischen cerebralrheumatismus. Arch Psychiat Nervenkr. 1952, 188: 261-273. 10.1007/BF00947044.PubMedGoogle Scholar
- Mitkov V: Cerebral manifestations of rheumatic fever. World Neurol. 1961, 2: 920-927.PubMedGoogle Scholar
- Mueller N, Ackenheil M: Immunoglobulin and albumin content of cerebrospinal fluid in schizophrenic patients: Relationship to negative symptomatology. Schizophr Res. 1995, 14: 223-228. 10.1016/0920-9964(94)00045-A.Google Scholar
- Carreno-Manjarrez R, Visvanathan K, Zabriskie J: Immunogenic and genetic factors in rheumatic fever. Curr Infect Dis Rep. 2000, 2: 302-307.PubMedGoogle Scholar
- Fish B: Neurobiologic antecedents of schizophrenia in children: Evidence for an inherited, congenital neurointegrative defect. Arch Gen Psychiatry. 1977, 34: 1297-1313.PubMedGoogle Scholar
- Meehl P: Schizotaxia, schizotypy, schizophrenia. Am Psychol. 1962, 17: 827-838.Google Scholar
- Moises HM, Zoega T, Gottesman II: The glial growth factors deficiency and synaptic destabilization hypothesis of schizophrenia. BMC Psychiatry. 2002, [http://www.biomedcentral.com/1471-244X/2/8]Google Scholar
- Prabakaran S, Swatton J, Ryan M, Huffaker S, Huang J, Griffin J, Wayland M, Freeman T, Dudbridge F, Lilley K, et al: Mitochondrial dysfunction in schizophrenia: evidence for compromised brain metabolism and oxidative stress. Mol Psychiatry. 2004, 9: 684-697. Epub Apr 20PubMedGoogle Scholar
- Yao J, Reddy R, van Kammen D: Oxidative damage and schizophrenia: an overview of the evidence. CNS Drugs. 2001, 15: 287-310.PubMedGoogle Scholar
- Mahadik S, Scheffer R: Oxidative injury and potential use of antioxidants in schizophrenia. Prostaglandins Leukot Essent Fatty Acids. 1996, 55: 45-54. 10.1016/S0952-3278(96)90144-1.PubMedGoogle Scholar
- Mooradian A: The antioxidative potential of cerebral microvessels in experimental diabetes mellitus. Brain Res. 1995, 671: 164-169. 10.1016/0006-8993(94)01327-E.PubMedGoogle Scholar
- Calingasan N, Park L, Calo L, Trifiletti R, Gandy S, Gibson G: Induction of nitric oxide synthase and microglial response precede selective cell death induced by chronic impairment of oxidative metabolism. Am J Pathol. 1998, 153: 599-610.PubMedPubMed CentralGoogle Scholar
- Mooradian A, Akon U: Age-related changes in the antioxidative potential of cerebral microvessels. Brain Res. 1995, 671: 159-163. 10.1016/0006-8993(94)01326-D.PubMedGoogle Scholar
- Schwarz M, Ackenheil M, Riedel M, Mueller N: Blood-cerebrospinal fluid barrier impairment as indicator for an immune process in schizophrenia. Neurosci Lett. 1998, 253: 201-203. 10.1016/S0304-3940(98)00655-7.PubMedGoogle Scholar
- Buka S, Tsuang M, Fuller-Torrey E, Klebanoff M, Bernstein D, Yolken R: Maternal infections and subsequent psychosis among offspring. Arch Gen Psychiatry. 2001, 58: 1032-1037. 10.1001/archpsyc.58.11.1032.PubMedGoogle Scholar
- Zornberg G, Buka S, Tsuang M: Hypoxia-ischemia-related fetal/neonatal complications and risk of schizophrenia and other nonaffective psychoses: a 19-year longitudinal study. Am J Psychiatry. 2000, 157: 196-202. 10.1176/appi.ajp.157.2.196.PubMedGoogle Scholar
- Brown A, Hooton J, Schaefer C, Zhang H, Petkova E, Babulas V, Perrin M, Gorman J, Susser E: Elevated maternal interleukin-8 levels and risk of schizophrenia in adult offspring. Am J Psychiatry. 2004, 161: 889-895. 10.1176/appi.ajp.161.5.889.PubMedGoogle Scholar
- Findlay G, Harris W: The topology of hair streams and whorls in man, with an observation on their relationship to epidermal ridge patterns. Am J Phys Anthropol. 1977, 46: 427-437.PubMedGoogle Scholar
- Furdon S, Clark D: Scalp hair characteristics in the newborn infant. Adv Neonatal Care. 2003, 3: 286-296. 10.1016/j.adnc.2003.09.005.PubMedGoogle Scholar
- Detmar M, Brown L, B B, Jackman R, Elicker B, Dvorak H, Claffey K: Hypoxia regulates the expression of vascular permeability factor/vascular endothelial growth factor (VPF/VEGF) and its receptors in human skin. J Invest Dermatol. 1997, 108: 263-268. 10.1111/1523-1747.ep12286453.PubMedGoogle Scholar
- Futamura T, Toyooka K, Iritani S, Nilzato K, Nakamura R, Tsuchiya K, Someya T, Kakita A, Takahashi H, Nawa H: Abnormal expression of epidermal growth factor and its receptor in the forebrain and serum of schizophrenic patients. Mol Psychiatry. 2002, 7: 673-682. 10.1038/sj.mp.4001081.PubMedGoogle Scholar
- Merrill JT: Regulation of the vasculature: clues from lupus. Curr Opin Rheumatol. 2002, 14: 504-509. 10.1097/00002281-200209000-00004.PubMedGoogle Scholar
- Ekdahl CT, Claasen J-H, Bonde S, Kokaia Z, Lindvall O: Inflammation is detrimental for neurogenesis in adult brain. Proc Natl Acad Sci USA. 2003, 100: 13632-13637. 10.1073/pnas.2234031100.PubMedPubMed CentralGoogle Scholar
- Dinc A, Melikoglu M, Korkmaz C, Fresko I, Ozdogan H, Yazidi H: Nailfold capillary abnormalities in patients with familial Mediterranean fever. Clin Exp Rheumatol. 2001, 19: s42-s44.PubMedGoogle Scholar
- den Broeder A, van den Hoogren F, van de Putte L: Isolated digital vasculitis in a patient with rheumatoid arthritis: good response to tumor necrosis factor alpha blocking treatment. Ann Rheum Dis. 2001, 60: 538-539. 10.1136/ard.60.5.538.PubMedPubMed CentralGoogle Scholar
- Stollerman GH: Rheumatic fever. Lancet. 1997, 349: 935-942. 10.1016/S0140-6736(96)06364-7.PubMedGoogle Scholar
- Bisno A, Pearce I, Wall H, Moody M, Stollerman GH: Contrasting epidemiology of acute glomerulonephritis: nature of the antecedent streprococcal infection. N Engl J Med. 1970, 283: 561-565.PubMedGoogle Scholar
- Smoot J, Barbian K, Van Gompel J, Smoot L, Chaussee M, Sylva G, Sturdevant D, Ricklefs S, Porcella S, Parkins L, et al: Genome sequence and comparative microarray analysis of serotype M18 group A Streptococcus strains associated with acute rheumatic fever outbreaks. Proc Natl Acad Sci USA. 2002, 99: 4668-4673. 10.1073/pnas.062526099.PubMedPubMed CentralGoogle Scholar
- Boin F, Zanardini R, Pioli R, Altamura C, Maes M, Gennarelli M: Association between -G308A tumor necrosis factor alpha gene polymorphism and schizophrenia. Mol Psychiatry. 2001, 6: 79-82. 10.1038/sj.mp.4000815.PubMedGoogle Scholar
- Schwab S, Mondabon S, Knapp M, Albus M, Hallmayer J, Borrmann-Hassenbach M, Trixler M, Gross M, Schulze T, Rietschel M, et al: Association of tumor necrosis factor alpha gene -G308A polymorphisms with schizophrenia. Schizophr Res. 2003, 65: 19-25. 10.1016/S0920-9964(02)00534-0.PubMedGoogle Scholar
- Katila H, Hanninen K, Hurme M: Polymorphisms of the interleukin-1 gene complex in schizophrenia. Mol Psychiatry. 1999, 4: 179-181. 10.1038/sj.mp.4000483.PubMedGoogle Scholar
- Erbagci A, Herken H, Koyluoglu O, Yilmaz N, Tarakcioglu M: Serum IL-1beta, sIL-2r, IL-6, IL-8, and TNF alpha in schizophrenic patients, relation with symptomatology and responsiveness to risperidone treatment. Mediators Inflamm. 2001, 10: 109-115. 10.1080/09629350120072761.PubMedPubMed CentralGoogle Scholar
- Moots R, Al-Saffer Z, Hutchinson D, Golding S, Young S, Bacon P, McLaughlin P: Old drug, new tricks: haloperidol inhibits secretion of proinflammatory cytokines. Ann Rheum Dis. 1999, 58: 585-587.PubMedPubMed CentralGoogle Scholar
- Leykin I, Mayer R, Shinitzky M: Short and long-term immunosuppressive effects of clozapine and haloperidol. Immunopharmacology. 1997, 37: 75-86. 10.1016/S0162-3109(97)00037-4.PubMedGoogle Scholar
- Maes M, Bocchio C, Bignotti S, Battisa T, Pioli R, Boin F, Kenix G, Bosmans E, de Jongh R, Lin A, et al: Effects of atypical antipsychotics on the inflammatory response system in schizophrenic patients resistant to treatment with typical neuroleptics. Eur Neuropsychopharmacol. 2000, 10: 119-124. 10.1016/S0924-977X(99)00062-0.PubMedGoogle Scholar
- Marek J: On the non-specific anitinflammatory effects of other-than-anitrheumatic drugs. Psychotropic drugs, inflammation and antiinflammatory drugs. Int J Tissue React. 1985, 7: 475-504.PubMedGoogle Scholar
- Rudolf S, Peters M, Rothermundt M, Arolt V, Kirchner H: The influence of typical and atypical neuroleptic drugs in the production of interleukin-2 and interfreron-gamma in vitro. Neuropsychobiology. 2002, 46: 180-185. 10.1159/000067807.PubMedGoogle Scholar
- Mueller N, Riedel M, Scheppach C, Brandstatter B, Sokullu S, Krampe K, Ulmschneider M, Engel R, Moller H, Schwartz M: Beneficial antipsychotic effects of celecoxib add-on therapy compared to risperidone alone in schizophrenia. Am J Psychiatry. 2002, 159: 1029-1034. 10.1176/appi.ajp.159.6.1029.Google Scholar
- McGuffin P, Asherson P, Owen M, Farmer A: The strength of the genetic effect. Is there room for an environmental influence in the aetiology of schizophrenia?. Br J Psychiatry. 1994, 164: 593-599.PubMedGoogle Scholar
- Moises H, Gottesman I: Genetics, risk factors, and personality factors. Contemporary Psychiatry. Edited by: Henn F, Helmchen H, Lauter H, Sartorius N. 2000, Heidelberg: Springer Verlag, 47-59.Google Scholar
- Turkheimer E: Spinach and ice cream: why social science is so difficult. Behavior Genetics Principles: Perspective in Development, Personality, and Psychopathology. Edited by: DiLalla L. 2004, Washington, D.C.: American Psychological Association, 161-189.Google Scholar
- Gottesman II, Shields J: A polygenic theory of schizophrenia. Proc Natl Acad Sci USA. 1967, 58: 199-205.PubMedPubMed CentralGoogle Scholar
- Ehrenreich H, Degner D, Meller J, Brines M, Behe M, Hasselblatt M, Woldt H, Falki P, Knerlich F, Jacob S, et al: Erythropoietin: a candidate compound for neuroprotection in schizophrenia. Mol Psychiatry. 2004, 1-13.Google Scholar
- Tsao B, Grossman J, Riemekasten G, Strong N, Kalsi J, Wallace D, Chen C-J, Lau C, Ginzler E, Goldstein R, et al: Familiality and co-occurrence of clinical features of systemic lupus erythematosus. Arthritis Rheum. 2002, 46: 2678-2685. 10.1002/art.10519.PubMedGoogle Scholar
- Dysken M, Patlak C, Dobben G, Pettigrew K, Bartko J, Burns E, Davis J, Refier D: Rapid dynamic CT scanning to distinguish schizophrenic from normal subjects. Psychiatry Res. 1987, 20: 165-175.PubMedGoogle Scholar
- Mueller N, Ackenheil M: Psychoneuroimmunology and the cytokine action in the CNS: Implications for psychiatric disorders. Prog Neuropsychopharmacol Biol Psychiatry. 1998, 22: 1-33. 10.1016/S0278-5846(97)00179-6.Google Scholar
- Harrison P, Weinberger D: Schizophrenia genes, gene expression, and neuropathology: on the matter of their convergence. Mol Psychiatry. 2005, 10: 40-68. 10.1038/sj.mp.4001558.PubMedGoogle Scholar
- Rosenthal D: Genetic Theory and Abnormal Behavior. 1970, New York: McGraw-Hill, 162-168.Google Scholar
- Schumacher J, Abon Jamra R, Freudenber J, Becker T, Ohiarun S, Otte A, Tullius M, Kovalenko S, Van Den Bogaert A, Maier W, et al: Examination of G72 and D-amino-acid oxidase as genetic risk factors for schizophrenia and bipolar affective disorder. Mol Psychiatry. 2004, 9: 203-207.PubMedGoogle Scholar
- Maziade M, Roy M-A, Chagnon Y, Cliche D, Fournier J-P, Montgrain N, Dion C, Lavallee J-C, Garneau Y, Gingras N, et al: Shared and specific susceptibility loci for schizophrenia and bipolar disorder: a genome scan in Eastern Quebec families. Mol Psychiatry. 2004, Nov 9 (e-pub): 1-14.Google Scholar
- Rajkowska G: Cell pathology in bipolar disorder. Semin Clin Neuropsychiatry. 2002, 7: 281-292. 10.1053/scnp.2002.35228.PubMedGoogle Scholar
- Muller M, Lucassen P, Yassouridis H, Hoogendijk W, Holsboer F, Swaab D: Neither major depression nor glucocorticoid treatment affects the cellular integrity of the human hippocampus. Eur J Neurosci. 2001, 14: 1603-1612.PubMedGoogle Scholar
- Gottesman I, Hanson D: Human Development: Biological and genetic processes. Annu Rev Psychol. 2005, 56: 263-286.PubMedGoogle Scholar
- Huleihel M, Golan H, Hallak M: Intrauterine infection/inflammation during pregnancy and offspring brain damages: possible mechanisms involved. Reprod Biol Endocrinol. 2004, [http://www.rbej.com/content/2/1/17]Google Scholar
- Gottesman I, Gould T: The endophenotype concept in psychiatry: etymology and strategic intentions. Am J Psychiatry. 2003, 160: 636-645. 10.1176/appi.ajp.160.4.636.PubMedGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2350/6/7/prepub