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Gender difference in adiponectin associated with cardiovascular mortality
© Alehagen et al. 2015
Received: 30 January 2015
Accepted: 5 June 2015
Published: 12 June 2015
It is important to identify cardiovascular diseases in patients at high risk. To include genetics into routine cardiological patients has therefore been discussed recently.
We wanted to evaluate the association between high-molecular weight adiponectin and cardiovascular risk, and secondly in the same population evaluate if specific genotype differences regarding risk could be observed, and thirdly if gender differences could be seen.
Four hundred seventy-six elderly participants recruited from a rural community were included. All participants underwent a clinical examination, echocardiography, and blood sampling and the single nucleotide polymorphism (SNP) (rs266729) of adiponectin was analysed. Follow-up time was 6.7 years.
Those with high serum concentration of adiponectin had a more 2 fold increased cardiovascular risk, and it might be that females exhibits even higher risk where a more than 5 fold increased risk could be seen. The result could be demonstrated even in a multivariate model adjusting for well-known clinical risk factors. However, as the sample size was small the gender differences should be interpreted with caution. In the genotype evaluation the C/C carriers of the female group had a more than 9-fold increased risk of cardiovascular mortality, however the confidence interval was wide. Such genotype difference could not be found in the male group.
High level of adiponectin was associated with increased cardiovascular risk. Also a gender difference in the genotype evaluation could be seen where the C/C carriers obtained higher risk in the female group but not in the male group. Thus, in order to identify patients at risk early, genetic analyses may add to the armamentarium used in the clinical routine. However, information should be regarded as hypothesis generating as the sample size was small and should stimulate further research in individualized cardiovascular prevention and treatment.
KeywordsGenotypes Gender Prognosis
Adiponectin is a peptide hormone and secreted from adipose tissue. It has a multitude of actions in the body, and has been shown to have insulin-sensitizing effects , anti-atherosclerotic effects , but also anti-inflammatory effects . In obese patients the circulating levels of adiponectin are reduced . Interesting, but contradictory data of the role of adiponectin in the cardiovascular area have been published. Li et al., report that in patients with coronary artery disease, a low plasma concentration of adiponectin is associated with higher cardiovascular risk . From a nested case-control study of more than 18,200 males Pischon et al. reported that a high plasma concentration of adiponectin was associated with a lower risk of myocardial infarction in persons without coronary artery disease . However, Hascoet et al. report a higher cardiovascular risk in those with a high serum concentration of adiponectin from a population with established coronary artery disease, but also in controls . Also, the Health ABC Study, Poehls et al. reported that in elderly healthy persons a higher concentration of adiponectin was associated with higher cardiovascular risk , and in elderly men without diagnosed cardiovascular disease Wannamethee et al. reported a higher cardiovascular risk in those with high plasma concentration of adiponectin . In an effort to evaluate a larger material Wu et al. reported from a meta-analysis including 14 different studies a strong association between high concentration of adiponectin and all-cause mortality, but also from eleven different studies in a meta-analysis a strong association between high concentration of adiponectin and cardiovascular mortality . From a study of almost 700 female patients Mackey et al. could report an association between high concentration of adiponectin and coronary heart disease in those with diabetes, but not among those without diabetes . In elderly persons with atrial fibrillation, a higher concentration of adiponectin was reported by Macheret et al. in a study of more than 3000 individuals . In an interesting study performed in dogs, Damoiseaux C et al. demonstrated a higher adiponectin concentration in dogs with dilated cardiomyopathy, compared to healthy dogs of the corresponding age . From Portugal, Fontes-Carvalho et al. reported that females, but not males with high concentration of adiponectin had increased risk for diastolic impairment of the heart . From three surveys of healthy persons Karakas et al. could not report any associations between serum level of adiponectin and risk coronary heart disease . Thus a complex picture is reported regarding a possible association between adiponectin and cardiovascular risk. However, in the vast majority of reports total adiponectin is analyzed, where only a minority of articles report on high-molecular-weight adiponectin, the biologically active part .
From the literature it is also evident that different genotypes of adiponectin could associated with cardiovascular risk. However, various researchers have investigated the role of the adiponectin gene in the risk of coronary artery disease with inconsistent results [17–19], and different single nucleotide polymorphisms (SNPs) of adiponectin have different associations with coronary artery disease risk [20–22]. The SNP rs266729 of adiponectin has been reported with increased risk of coronary artery disease in some reports [17, 23, 24], whereas Cheung et al. could not report any association between rs266729 and risk of coronary artery disease either in males nor in females . Pileggi et al. reported that that the G allele of rs266729 was associated with increased risk of heart failure as evaluated from a population of more than 2300 Italian participants of which half had heart failure . Thus, there is evidence that rs266729 could give prognostic cardiovascular information based on the literature.
The primary aim of this study was therefore to evaluate a possible association of cardiovascular death with expression of high molecular weight of adiponectin and rs266729 gene polymorphism. The secondary aim was to evaluate if the associations are gender specific.
The study population consisted of 476 apparently healthy individuals (men: 242; females: 234) with a mean age of 77.0 years (range:18 years) living in a rural municipality in the south-east of Sweden and invited to participate in this project. They were all part of a longitudinal epidemiological study focusing on cardiovascular risk factors . All the participants in that study were invited to participate in the present sub-study conducted from 13th January 2003 through 18th June 2005. All participants underwent a clinical examination, ECG recording, and Doppler-echocardiography, and blood samples were collected. New York Heart Association (NYHA) functional class classification (The NYHA functional class grades how a patient with heart disease experiences symptoms of tiredness, breathlessness or chest pain and is graded from I-IV, where IV is symptoms experienced while at rest) was evaluated by the including physician based on the patient information. All participants gave their informed consent, and the study was conducted in accordance with the Declaration of Helsinki principles. The study protocol was approved by the Regional Ethical Review Board of Linköping, Sweden (Dnr 95044). The mortality information was obtained from the National Board of Health and Welfare in Sweden, which registers all deaths, or from autopsy reports.
Diabetes mellitus was defined as a previous diagnosis with on-going treatment, or a blood glucose ≥ 7 mmol/L. Hypertension was defined as a previous diagnosis with on-going treatment or a blood pressure ≥ 140/90 mmHg at rest. Ischemic heart disease was defined as a history of angina pectoris/myocardial infarction or ECG-verified myocardial infarction. Heart failure was defined as a previous diagnosis with on-going treatment, or symptoms/signs of heart failure and objective demonstration of reduced cardiac function in terms of impaired cardiac function on echocardiography, or increased plasma concentration of proBNP 1–76.
Echocardiography examinations were performed on (Accuson XP-128c) with the patients in a supine left position. Values for systolic function expressed as left ventricular ejection fraction (EF), were categorized into four classes with interclass limits 30 %, 40 % and 50 %. Normal systolic function was defined as EF ≥ 50 %.
All blood samples were collected in pre-chilled plastic Vacutainer tubes (Terumo EDTA K-3, Terumo Europe N.V., Leuven, Belgium) obtained while the patients were at rest in a supine position. Plasma was prepared by centrifugation at 3000 g for 10 min at 4 °C. All samples were stored at—70 °C until analysis, and none of the samples were thawed more than twice.
ProBNP 1–76 (NT-proBNP) was measured using the Elecsys 2010 platform (Roche Diagnostics, Mannheim, Germany). The total coefficient of variation was 4.8 % at 26 pmol/L and 2.1 % at 503 pmol/L (n = 70) at our laboratory.
High molecular weight form of adiponectin concentrations were measured in serum using Quantikine ELISA kit according to the manufacturer’s instructions (R&D Systems, Abingdon, United Kingdom). In brief, serum samples were diluted 1:100 and added to the mouse monoclonal capture antibody precoated wells for three hours. After washing, high molecular weight conjugate was added for one hour, which was followed by washing, and thereafter substrate solution was added for 30 min. After addition of stop solution, optical density of each well was determined using a microplate reader set to 450 nm with wavelength correlation set to 540 nm.
Genomic DNA was isolated from peripheral blood using QIAmp DNA Mini Kit (QIAGEN, Hilden, Germany), following the manufacturer’s instructions. The 7500 Fast Real-Time PCR system (Applied Biosystems, CA, USA) was used for analysis of adiponectin (rs266729) using a TaqMan SNP genotyping assay mixed with TaqMan Universal PCR Master mix II (Applied Biosystems).
Descriptive data are presented as percentages or mean and SD. Comparative analyses were performed using the Student unpaired two-sided T-test, whereas the chi-square test was used for discrete variables. One-way analysis of variance (ANOVA) followed by Bonferroni’s post-hoc test were used to compare values between the different genotypes. Both univariate and multivariate Cox proportional hazard regression analyses as well as a Kaplan-Meier analysis were used to analyse and illustrate the risk of mortality during the follow-up period. The covariates that were adjusted for in the multivariate model were: Age, Hypertension, Ischemic heart disease, Body mass index, C-reactive protein, b-glucose, High density lipoprotein, Estimated glomerular filtration rate < 60 mL/min, Hemoglobin < 120 g/L, Ejection fraction < 40 % and N-terminal fragment of proBNP 4th quartile. Both all-cause mortality and cardiovascular mortality were analysed. Censored patients were patients who were still alive at end of the study period or who had died of other causes than cardiovascular disease. Completed patients comprised those who had died due to cardiovascular disease.
A P-value < 0.05 was considered statistically significant. All data were analysed using standard software packages (Statistica v. 12.0, Statsoft Inc, Tulsa, OK, USA).
Basal characteristics of the total study population and divided into genders
Age, mean (SD)
IHD, n (%)
Hypertension, n (%)
ACEI/ARB, n (%)
Hb < 120 g/L, n (%)
Beta blockers, n (%)
b-glucose, mmol/L, mean, (SD)
HDL, mmol/L mean, (SD)
eGFR < 60 mL/min, n (%)
CRP, mg/L, mean (SD)
EF < 40 %, n (%)
NT-proBNP ng/L, mean, (SD)
Adiponectin pg/mL, mean, (SD)
High-weight-molecular (HWM) adiponectin
The biologically active part of adiponectin, HWM-adiponectin was evaluated in the total study population. From the gender characteristics it could be seen that the female group had clearly higher concentration of adiponectin (mean: 7884 pg/mL vs. 4829 pg/mL; t = 6.51; p < 0.0001). The four quartiles of HMW-adiponectin (1st quartile: < 3875 pg/mL; 2nd quartile: 3875-6630 pg/mL; 3rd quartile; 3876-8047 pg/mL; 4th quartile; >8047 pg/mL) were evaluated according to cardiovascular risk.
Adiponectin and cardiovascular mortality
Cox proportional hazard regression illustrating the risk of cardiovascular mortality during 6.7 years of follow-up of the study population having a high plasma concentration of adiponectin
95 % CI
95 % CI
95 % CI
eGFR < 60 mL/min
Hb < 120 g/L
EF < 40 %
NT-proBNP Q4 (>197 ng/L)
Adiponectin Q4 (>12800 pg/mL)
All-cause mortality in the study population distributed into the three analyzed genotypes of the adiponectin genes
C/C, n (%)
p = 0.90
C/G, n (%)
p = 0.40
G/G, n (%)
p = 0.17
Genotypes of rs266729 and cardiovascular mortality
Cox proportional hazard regression illustrating the risk of cardiovascular mortality in the C/C allele versus the C/G or G/G allele of rs266729 SNP of adiponetin adjusted for well-known clinical risk factors influencing cardiovascular risk in an elderly population during 80 months of follow-up
95 % CI
95 % CI
95 % CI
Rs266729 C/C vs. C/G or G/G
Performing the corresponding analyses of the different genotypes of rs266729 in the male group did not reveal any significant differences between the three genotypes.
Adiponectin and cardiovascular mortality
The protein adiponectin has a multifaceted action in the body, including effects in the cardiovascular area. It is generally believed that adiponectin suppresses apoptosis, and directly protects the cardiac cells from oxidative stress and inflammation and finally from ischemic injuries . The complexity of actions of adiponectin is illustrated by the fact that even if adiponectin have a cardiovascular protecting effect , many epidemiological studies have shown that high levels is associated with increased cardiovascular mortality [9, 10, 29, 30]. The data we present gives support for this observation with higher mortality in those with high plasma level of of the SNP rs266729 of adiponectin.
Therefore, the hypothesis has been launched that a healthy and a diseased population differs in pattern of reaction on high levels of adiponectin , and there are reports indicating a cardioprotective effect of high levels of adiponectin in healthy individuals . Furthermore, in the literature there are reports indicating a gender difference in serum levels of adiponectin where the females have higher levels compared to males [8, 30]. We could corroborate this relation as we can report a highly significant difference between the two genders with a higher plasma level in the females.
We have evaluated the biologically active part of adiponectin, the high molecular weight part. Even if the vast majority of reports in the literature is on total adiponectin measurements, the results regarding cardiovascular risk evaluations can be compared, as reported by Karas et al. . We could demonstrate a more than 2 fold increased risk of cardiovascular mortality if high levels of HMW-adiponectin could be measured, even in competition with NT-proBNP, and when adjusted for other well-known clinical variables. Even if the confidence interval is wide, the information that high levels of adiponectin is a significant risk, is robust.
The golden standard of biomarkers in the handling of heart failure is NT-proBNP, and in the literature there are reports indicating a significant correlation between NT-proBNP and plasma adiponectin in asymptomatic older men . Wannamethee et al. reported a correlation coefficient of 0.16 (p < 0.0001) . We could report the same correlation coefficient in the corresponding evaluation in our male population (r = 0.16; p = 0.024), and an even higher correlation coefficient in our female population (r = 0.22; p = 0.008).
Genotypes of rs266729 and cardiovascular mortality
For the first time we have also investigated the distribution and the prognostic information of the three genotypes C/C, C/G and G/G of rs266729 SNP of adiponectin in the same population as evaluated above. We could report a higher cardiovascular risk for the C/C carrier compared to the two other genotypes among the females, but not among the males, even if the gender difference should be interpreted with caution due to a small sample size. As there are variables that are associated with the rs266729 SNP, as systolic blood pressure reported by Avery et al. we have adjusted for hypertension in our multivariate evaluations, and still could report the significant difference in cardiovascular risk of the three genotypes in females . As there is an association between b-glucose and adiponectin, and between high density lipoprotein, adjustments have also been done with these covariates. The result, however, persisted.
The two genders have been evaluated regarding cardiovascular risk in those with high adiponectin concentration, and the C/C carriers. Even after adjusting for multiple testing using Bonferroni’s rule (multiplying the obtained P value with the number of tests performed), there is still a clear significance for the adjusted P value obtained in the female group (p = 0.028 for the increased cardiovascular risk in those with a adiponectin concentration in the 4th quartile, and p = 0.002 for the increased cardiovascular risk of the female C/C carriers in the multiple models).
The presented study has a limited sample size influencing the obtained results of the statistical evaluations. Therefore, it does not have power to exclude that the male group also could have increased risk in those with high adiponectin concentration, or are C/C carriers, as could be seen from the relatively wide confidence intervals of the obtained point estimate in the multiple Cox regressions. However, the results presented indicate that for those with high adiponectin levels, or for the C/C carriers an increased risk exist.
The obtained results are interesting, and as the cost for the obtained genetic evaluations are not much higher than that from biomarker analyses done in the clinical routine, it could be suggested that this type of evaluation might help the clinician to identify a group with increased cardiovascular risk when health resources are limited.
The presented research is a community-based study, and thus the majority of patients had discrete or no cardiovascular symptoms. However, those with cardiovascular disease (ischemic heart disease and/or hypertension and/or diabetes and/or heart failure: were not in the minority (419 out of 476: 88 %) and thus the size of those with increased cardiac risk is significant. However, the total study population was small which resulted in wide confidence intervals in risk evaluations, thus making the interpretation of these uncertain.
Also, the presented study population was an elderly population, and therefore it was not possible to extrapolate the obtained results into other age groups. Besides, this population consists of an elderly Swedish population consisting of only Caucasian participants. It is therefore not possible to extrapolate the results into other ethnicities.
Also, due to the limited sample size the gender differences demonstrated should be regarded as hypothesis-generating, and the interpretation should therefore be drawn with caution, even if the interaction analysis point to a specific gender difference.
Finally, as the subgroups of those with certain genotypes are small, the results of some of the evaluations should be interpreted with caution. The presented study should therefore be regarded as hypothesis generating, and should warrant for further research.
Adiponectin is a protein that have complex functions within the body. We present data indicating an association between high plasma levels of adiponectin and increased cardiovascular risk for elderly healthy persons, and there is indications that there is a gender difference. We could also present that in the same population the females with the C/C carrier of the rs266729 SNP of adiponectin had a significantly increased cardiovascular risk compared to the C/G or the G/G carriers. No such a difference in cardiovascular risk could be observed in the males.
We suggest that these data, as extracted from a relatively small sample would be regarded as hypothesis- generating, and to warrant further research in this expanding area.
Financial disclosures for all authors: None.
Funding and support: This study was supported by grants from the County Council of Östergötland, University of Linköping, Linköping, Sweden, and the Swedish Heart and Lung Foundation.
Role of the sponsor: The funding organization had no role in the design and concept of the study; the collection, management, analysis, and interpretation of data; or the preparation, review or approval of the manuscript.
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