Association of soluble endothelial protein C receptor plasma levels and PROCR rs867186 with cardiovascular risk factors and cardiovascular events in coronary artery disease patients: The Athero Gene Study
© Kallel et al.; licensee BioMed Central Ltd. 2012
Received: 31 July 2012
Accepted: 12 October 2012
Published: 8 November 2012
Blood coagulation is an essential determinant of coronary artery disease (CAD). Soluble Endothelial Protein C Receptor (sEPCR) may be a biomarker of a hypercoagulable state. We prospectively investigated the relationship between plasma sEPCR levels and the risk of cardiovascular events (CVE).
We measured baseline sEPCR levels in 1673 individuals with CAD (521 with acute coronary syndrome [ACS] and 1152 with stable angina pectoris [SAP]) from the AtheroGene cohort. During a median follow up of 3.7 years, 136 individuals had a CVE. In addition, 891 of these CAD patients were genotyped for the PROCR rs867186 (Ser219Gly) variant.
At baseline, sEPCR levels were similar in individuals with ACS and SAP (median: 111 vs. 115 ng/mL respectively; p=0.20). Increased sEPCR levels were found to be associated with several cardiovascular risk factors including gender (p=0.006), soluble Tissue Factor levels (p=0.0001), diabetes (p=0.0005), and factors reflecting impaired renal function such as creatinine and cystatin C (p<0.0001). sEPCR levels were not significantly associated with the risk of CVE (median: 110 and 114 ng/mL in individuals with and without future CVE respectively; p=0.68). The rs867186 variant was found to explain 59% of sEPCR levels variability (p<10-200) but did not associate with CVE risk.
Our findings show that in patients with CAD, circulating sEPCR levels are related to classical cardiovascular risk factors and renal impairment but are not related to long-term incidence of CVE.
Keywords\ Haemostasis Protein C Endothelial protein C receptor Coronary artery disease
Coronary artery disease (CAD) is the leading cause of death in the developed world . It is an inflammatory process that involves cellular and molecular responses to endothelial dysfunction . One such response is blood coagulation, and recent studies demonstrate that blood coagulation is an essential determinant of the risk of CAD complications [2, 3].
The protein C (PC) anticoagulant pathway plays a pivotal role in controlling thrombosis and in limiting the inflammatory response. It may also reduce endothelial cell apoptosis in response to inflammatory cytokines and ischemia [3, 4]. The endothelial PC receptor (EPCR) is important to these processes. Mainly expressed on the endothelial cells of large vessels [5–7], by binding to PC, EPCR accelerates the rate of PC activation approximately twenty fold in vivo. Once PC is activated (Activated PC, APC), EPCR also mediates its anti-apoptotic effect on endothelial cells .
In addition to endothelial cell-bound EPCR, a soluble form of EPCR (sEPCR) circulates in human plasma resulting from EPCR membrane shedding mediated by a metalloprotease [7, 10], probably TACE/ADAM17 . This process occurs constitutively and is amplified by thrombin and some inflammatory cytokines (e.g., TNFα, IL-1β) [4, 11]. sEPCR binds PC and APC with the same affinity as the original membrane form of EPCR and may inhibit both PC activation and APC anticoagulant activity . In addition, sEPCR modulates inflammation by binding to activated neutrophils [13, 14] and also reportedly binds to factor VIIa, reducing the ability of FVIIa to activate FX . Moreover, high levels of plasma sEPCR were observed in patients with clinical conditions in which thrombin is generated, such as CAD [13, 16], and decreased sEPCR levels were observed in another study of patients on anticoagulant therapy .
These data all suggest that sEPCR may act as a procoagulant by reducing antithrombotic and anti inflammatory effects. However, data regarding the association between sEPCR plasma levels and the risk of thrombosis are sparse and contradictory. Uitte de Willige et al., reported that a high level of sEPCR increased the risk of venous thrombosis, whereas another retrospective case/control study showed that patients with increased sEPCR levels had a reduced risk of myocardial infarction (MI) .
Several studies demonstrated that sEPCR levels were strongly genetically controlled [17–22]. The rs867186 diallelic single nucleotide polymorphism in the PROCR gene (g.6936A_G, c.4600A_G), resulting in a serine-to glycine substitution at codon 219 in the membrane-spanning domain of EPCR, explains between 56% and 87% of the variations in sEPCR levels [17, 20, 23]. The G allele tags the A3 haplotype (4 common PROCR haplotypes have been identified in whites) and is associated with increased shedding of EPCR from the endothelial membrane, both by rendering the receptor more sensitive to cleavage  and by leading to a truncated mRNA through alternative splicing . Besides this important genetic effect, little is known about the association between sEPCR plasma levels and other environmental cardiovascular risk factors.
Since markers of procoagulable state are of major relevance to CAD, sEPCR could be a risk factor or a predictor of cardiovascular events (CVE) in individuals with CAD.We tested this hypothesis in the AtheroGene prospective cohort. We also studied the relation between sEPCR levels and conventional cardiovascular risk factors.
The Athero Gene study is a prospective cohort of CAD patients enrolled during several successive phases of recruitment between November 1996 and February 2004 . Briefly, patients who underwent coronary angiography at the Medical Department of the Johannes Gutenberg-University Mainz or the Bundeswehrzentralkrankenhaus Koblenz and who had at least one stenosis >30% diagnosed in a major coronary artery were enrolled in the cohort. Unstable angina was classified by Braunwald classification (class B or C). Follow-up information was obtained on non-fatal myocardial infarction (MI) and on death from cardiovascular (CV) causes (fatal MI, heart failure as a consequence of MI, ventricular arrhythmia, fatal stroke and other cause of vascular deaths). Information on the cause of death was obtained from the hospital or from the patient’s general practitioner.
Among patients recruited in the early phase of the study, insufficient plasma remained for sEPCR testing. Therefore, this study included only patients recruited after June 1999 (n = 1673 - second round of the AtheroGene Study). Among these, 525 (31%) presented an acute coronary syndrome (ACS) at entry (314 unstable angina and 211 acute MI). The remaining individuals presented a stable angina pectoris (SAP) at entry. All individuals were followed up for a median time of 3.7 years (maximum 6.2) and 136 experienced a CVE (71 non-fatal MI and 65 CV deaths).
Study participants had German nationality, were inhabitants of the Rhein-Main area, and were of European descent. The study was approved by the ethics committee of the University of Mainz. Participation was voluntary, and each participant gave written informed consent.
Blood was drawn from all study subjects under standardized conditions before coronary angiography was performed. Samples were stored at −80°C until analysis. Plasma sEPCR levels were measured by enzyme linked ImmunoSorbent Assay (ELISA) according to the manufacturer’s instructions. The asserachrom sEPCR ELISA kits were from Diagnostica Stago (Asnière, France) and the inter-assay variability was 7.5%. Other biological parameters were measured as previously described .
DNA was available in a subsample of 891 CAD patients among which 77 experienced a CVE during the follow-up. In these patients, five PROCR single nucleotide polymorphisms (SNPs), including the PROCR rs867186 (Ser219Gly), were typed using the Affymetrix Genome-Wide Human SNP 6.0 array as part of a previously described genome-wide association study .
Associations between baseline cardiovascular risk factors and CVE were tested by ANOVA and Chi2 analyses. Associations between sEPCR levels, haemostatic parameters and other cardiovascular risk factors were investigated through Pearson correlation coefficients adjusted for age and sex. sEPCR was log transformed to remove positive skewness. The relationship between sEPCR (considered as continuous variables or interquartiles) and CVE was tested by Cox regression analysis. Two models were successively fitted: model 1was first adjusted for age and sex; model 2 was additionally adjusted for clinical status (ACS vs. stable angina), smoking status, body mass index, diabetes, hypertension, HDL-cholesterol, triglyceride, CRP, number of stenosed vessels, and medication use (heparin, beta-blockers, ACE-inhibitors, calcium antagonists and statins).
Association of PROCR SNPs with CVE was tested by the Cochran-Armitage trend test  and by a Cox regression analysis, while their association with log sEPCR levels was tested by a linear model. Linkage disequilibrium and haplotype analyses of PROCR SNPs were conducted using the THESIAS software .
All analyses were performed with SAS software, version 9.1 (SAS Institute Inc., Cary,NC, USA). P-values< 0.05 were considered statistically significant.
Baseline characteristics of individuals according to cardiovascular outcome
Baseline characteristics of coronary artery disease (CAD) patients according to the outcome during follow-up
No cardiovascular event n=1537
Cardiovascular event n=136
61.2 ± 9.5
62.8 ± 10.5
p = 0.059
323 (21 %)
p = 0.050
Acute coronary syndrome
467 (30 %)
58 (43 %)
p = 3.78 10-3
Previous myocardial infarction
586 (38 %)
65 (48 %)
p = 0.028
Number of stenosed coronary arteries
438 (29 %)
21 (15 %)
479 (31 %)
43 (32 %)
p = 1.31 10-3
620 (40 %)
72 (53 %)
Body mass index (kg/m2)
27.7 ± 3.9
27.8 ± 3.8
p = 0.927
304 (20 %)
33 (24 %)
p = 0.219
240 (16 %)
43 (32 %)
p = 1.17 10-5
1151 (75 %)
105 (77 %)
p = 0.606
Medications at enrollment
521 (34 %)
55 (40 %)
p = 0.132
1327 (86 %)
108 (79 %)
p = 0.039
800 (52 %)
68 (50 %)
p = 0.277
1026 (67 %)
80 (59 %)
p = 0.072
770 (50 %)
84 (62 %)
p = 9.41 10-3
197 (13 %)
25 (18 %)
p = 0.085
Total cholesterol (mgdL-1)
197 ± 45
205 ± 51
p = 0.038
49.4 ± 13.5
48.1 ± 13.6
p = 0.290
p = 0.143
2.39 (1.02 - 6.14)
4.59 (1.89 - 11.7)
p = 8.41 10-6
Fibrin monomers (μmL)
3.90 (2.64 - 5.33)
3.32 (2.64 - 5.34)
p = 0.514
0.34 (0.24 - 0.52)
0.39 (0.25 - 0.78)
p = 0.024
t-TAFI (μg mL-1)
12.0 ± 2.7
12.4 ± 2.7
p = 0.196
10.48 (8.13 - 13.95)
11.59 (9.00 - 15.08)
p = 2.75 10-3
Soluble Tissue factor (pgmL-1)
p = 0.641
10.80 (7.61 - 18.89)
13.46 (9.34 - 25.89)
p = 7.54 10-3
0.96 ± 1.03
1.03 ± 0.29
p = 5.59 10-4
Cystatin C (mgL-1)
0.81 (0.71 - 0.94)
0.86 (0.72 - 1.08)
p = 1.28 10-4
p = 0.654
Association between sEPCR levels and cardiovascular risk factors
Association between sEPCR, haemostatic parameters and other cardiovascular risk factors, adjusted for age and sex
Pearson’s partial correlation coefficients
Body mass index
Soluble Tissue factor
Median (interquartile range)
Acute coronary syndrome
Association between sEPCR levels and cardiovascular outcome
Hazard ratios (95% confidence interval) for cardiovascular death or myocardial infarction according to quartiles of baseline sEPCR levels
p (continuous scale)
48 - 93
94 - 113
114 - 162
163 - 600
Patients with events/ all patients
1.00 (0.63 - 1.60)
0.85 (0.52 - 1.39)
1.03 (0.65 - 1.64)
1.11 (0.67 - 1.83)
0.96 (0.57 - 1.62)
1.13 (0.69 - 1.87)
PROCR SNPs analysis
Pairwise linkage disequilibrium observed at the PROCR locus in the AtheroGene study (n = 891)
Genotype distribution of the PROCR polymorphisms in CAD patients according to the outcome during follow-up
No cardiovascular event N = 805
Cardiovascular events N = 77
p = 0.752
p = 0.092
p = 0.948
Association of the main PROCR haplotypes with sEPCR (log) levels in the AtheroGene study (n = 891)
+0.786 [0.742 - 0.829] p = 6.74 10-270
−0.027 [−0.061 - 0.007] p = 0.125
0.028 [−0.009 - 0.066]p = 0.143
Global test for haplotypic association
χ2 with 3 df = 792.6 p =1.71 10-171
Of note, in this sample, the Hazard Ratio (HR) for future CVE associated with an increase of log-sEPCR (on continuous scale) was 0.84 [0.35 - 2.02] (p = 0.69) in carriers of the rs867186 AA genotype while an opposite trend (HR of 4.88 [0.87 - 27.4] (p = 0.07) was observed in carriers of the rs867186-G allele. The test for homogeneity of these two HRs was borderline (p = 0.075).
To the best of our knowledge, this is the first prospective study that investigates the association between sEPCR levels and CAD. Contrary to our initial hypothesis, there was no association between sEPCR levels and future CVE. Moreover both individuals with ACS and SAP at baseline had similar sEPCR levels.
Only one previously published case–control study examined the relationship between sEPCR levels and CAD . In this work, stratification of sEPCR in quartiles according to the levels in controls showed that, compared to the first quartile, the OR for subjects with values in the 4th quartile was 0.57 (95CI: 0.34-0.95). This result differs from ours, as we did not find a protective effect of high sEPCR levels in our cohort. Among the possible explanations for this discrepancy are differences in study design (retrospective versus prospective) and in the age of study participants at baseline (median age of 42 years in the case–control study versus 62 years in our prospective study). It could also be argued that the low number of events observed during the follow-up with median time of 3.7 years may have limited our power to detect any association of sEPCR with future CVE, especially if sECPR effects, if any, exert at a later time period. Nevertheless, our study was large enough to detect the association of several biomarkers, including parameters characterizing the renal function, with the risk of future CVE.
The physiological role of sEPCR is still unclear. Elevated plasma sEPCR levels may increase thrombotic risk by inhibiting PC and APC and by competing with membrane associated EPCR for PC binding . High plasma sEPCR levels might also result in low residual EPCR levels on the membrane, resulting in reduced PC activation. Alternatively, higher levels of endothelial or soluble EPCR may shift the haemostatic balance toward anticoagulant activity by inhibiting the activation of FX by the FVIIa-tissue factor (TF) complex. Low sEPCR levels, on the other hand, also might reflect increased thrombotic risk. This could be caused by low EPCR expression on the endothelium or by membrane-bound EPCR that is resistant to ADAM17 shedding , resulting in decreased APC formation. Further studies are needed to investigate the relationship between EPCR membrane expression and its circulating form. Indeed, a recent study reported that TNFα causes a rapid down-regulation of membrane associated EPCR expression without markedly affecting the spontaneous release of sEPCR by arterial endothelial cells .
With respect to parameters affecting sEPCR levels, we confirmed in a subsample of 891 patients who had both sEPCR measured and DNA available the major impact of the Ser219Gly EPCR polymorphism on sEPCR levels [17–22]. However, we did not observe any evidence in favour of an association of Ser219Gly with future CVE. This is unlikely due to a loss power since the same allele frequencies were observed in both groups of patients with or without future CVE. Conversely, this is in line with a recent review demonstrating that this polymorphism is unlikely a risk variant for arterial thrombosis but more likely a risk variant for venous thrombosis . Nevertheless, it would be highly interesting to investigate whether the trend of association observed between sEPCR and CVE risk in rs867186-G carriers only could replicate in a much larger cohort with a longer follow-up.
In addition, we have explored the association of plasma sEPCR levels with haemostatic variables. sEPCR levels correlated with sTF and t-TAFI levels. Previous studies demonstrated that sTF levels, but not t-TAFI, were predictive of cardiovascular death in individuals with CAD [27, 33]. In atherosclerosis, circulating sTF can arise not only by membrane shedding but also by alternative splicing . Several recent observations indicate that FVIIa interacts with EPCR in vivo. Moreover, analysis of FVII, FVIIa, and sEPCR levels in a large group of healthy individuals revealed that those with higher sEPCR levels also had higher levels of circulating FVII and FVIIa . The association observed between sEPCR and sTF in the present study underlines the interplay between EPCR and the extrinsic coagulation pathway.
Several papers [14, 36] have previously suggested that sEPCR levels could be a reliable marker of thrombin generation. Our study did not favour this hypothesis as no relation was observed between sEPCR levels and markers of thrombin generation such as D-dimer, fibrin monomers, and TAFIa/TAFIai levels.
We also evaluated the relationship between sEPCR levels and traditional cardiovascular risk factors. We confirmed recent data  demonstrating that gender strongly correlates with sEPCR levels, with higher circulating sEPCR levels observed in males. We found a strong association between diabetes and sEPCR levels. These results are in line with those from Ireland et al.  who observed a contribution of duration of diabetes on sEPCR levels in the Ealing Diabetes Study of Coagulation (EDSC). Interestingly, we also found a strong correlation between sEPCR and parameters reflecting kidney functions such as creatinine and cystatin C. High sEPCR levels were reported in hemodialysis patients and significantly decreased after kidney transplantation . This finding extends those already reported on the association between coagulation parameters and kidney function .
In conclusion, we reported the first prospective study investigating the association of sEPCR with CAD. We observed no association between sEPCR levels and acute coronary syndrome or with future cardiovascular events. However, sEPCR levels were associated with conventional cardiovascular risk factors such as diabetes and parameters reflecting kidney function. More research is warranted to elucidate the pathogenic effect of sEPCR in CAD.
This work was supported by a grant of the Programme National de Recherche sur les Maladies Cardiovasculaires 2006 (A06034AS), by the “Stiftung Rheinland-Pfalz für Innovation”, Ministry for Science and Education (AZ 15202-386261/545), Mainz, by the MAIFOR grant 2001 of the Johannes Gutenberg-University Mainz, Germany and by a grant from the Fondation de France (no. 2002004994).
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