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Association of human platelet alloantigens encoding gene polymorphisms with the risk of Coronary artery disease in Iranian patients

BMC Cardiovascular Disorders volume 21, Article number: 68 (2021) Cite this article

Abstract

Background

Coronary artery disease (CAD) is characterized by narrowing/ blockade of coronary arteries that is mainly caused by atherosclerotic plaques. Considering the involvement of platelet abnormalities, such as defective aggregation and adhesion, in the cardiovascular-related disorders, genetic variations in human platelet alloantigens (HPA) have been implicated in the CAD susceptibility. Herein, we intended to determine the association of HPA-1 to -6, -9, and -15 biallelic polymorphisms with CAD in an Iranian population.

Methods

In this retrospective case–control study, 200 CAD subjects and 100 matched healthy individuals were enrolled. DNA samples were isolated from peripheral blood samples and genotyping of HPA polymorphisms was accomplished using polymerase chain reaction-sequence-specific primers.

Results

The alleles and genotypes of studied HPA polymorphisms were equally distributed among cases and controls and therefore no statistically significant differences were detected. Univariate analysis identified no association of combined haplotypes with CAD risk. However, multivariate analysis showed a positive association of the‌ HPA1b/2a/3b haplotype with CAD after adjustment for some covariates (including BMI, TG, LDL, FBS and blood pressure) that conferred a CAD susceptibility haplotype (P = 0.015; OR = 2.792; 95% CI 1.45–8.59).

Conclusions

Although alleles, genotypes, and haplotypes of HPA polymorphisms were not associated with CAD risk, HPA1b/2a/3b haplotype was found to be a dependent disease risk haplotype in Iranian population after correcting for confounding factors.

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Background

Coronary artery disease (CAD) is a leading cause of mortality and morbidity in the globe. According to a report in 2014, about 17.5 million individuals died due to CAD [1], in which approximately 80% of death cases occurred in the countries with low/middle-income economy [2]. CAD in considered as a common disease of the vascular system and is defined by prolonged atherosclerotic lesions that eventuate in narrowing and ultimately obstructing the coronary arteries, resulting in tissue injury. The most critical manifestations of the CAD are myocardial infarction (MI) and angina, with the ultimate development of thrombosis of coronary arteries and rupture of the plaques [3]. Currently, many risk factors have been reported to be involved in susceptibility to CAD. More than 250 genes play critical roles in CAD predisposition that are involved in increasing or decreasing risks of CAD [4,5,6].

Evidence show that impaired aggregation and adhesion of platelets might be underlying contributing factor in the progression of coronary syndrome. Additionally, genetic polymorphisms in human platelet antigens (HPAs) have been recognized to be associated with susceptibility to CAD [7]. Receptors of the membrane glycoproteins (GP) on the platelets are involved in the activation, aggregation, and adhesion of platelets, the serialized occurrences that culminate in thrombus formation and development of acute coronary syndrome (ACS) [8,9,10]. Most of the known HPA (20 of 33) are located on the GPIIb/IIIa complex, while the remaining 13 HPAs are expressed on other GP complexes of the platelet, including GPIb/IX/V, GPIa/IIa and CD109 [11]. Several studies have indicated an association between multiple genetic polymorphisms harbored by the genes coding the platelet GPs with dysregulated functions of the platelets, such as promoted platelet adhesion and aggregation, and therefore increase the risk of CAD [12].

Studies have reported the role of HPA-1, HPA-2, and HPA-3 in development of disorders associated with blood clotting and platelet aggregation, hence conferring a risk for the onset of cardiovascular diseases [11]. In addition, most of the GPs on the platelets (such as GPIIb/IIIa) have been shown to harbor these SNPs [13].

Previous studies are inconsistent with the association of HPA-1b/2a/3b alleles, genotypes, haplotypes, and traditional risk factors with CAD. The observed conflict in the results of different studies may stem from diagnostic criteria in determination of the CAD patients, genetic detection techniques, and adjustment of genetic polymorphisms to other risk factors of CAD. Moreover, differences in genetic stratifications in different ethnic populations may also be involved in the incongruent results. This study evaluated most important HPA polymorphisms (HPA-1, HPA-2, HPA-3) as well as those with little considerations in previous studies (HPA-4, HPA-5, HPA-6, HPA-9, and HPA-15) in association with CAD susceptibility in an Iranian population.

Study subjects and methods

Patients and controls

The current retrospective case–control study, comprising 200 unrelated Iranian patients with CAD, consisted of 124 males and 76 females (mean age of 62.21 ± 9.48). The subjects were selected consecutively from individuals who referred to the Rajaei Heart Hospital, Tehran, Iran between January 2018 until August 2019. As the control group, 100 healthy and unrelated Iranian individuals, consisting of 55 males and 45 females (mean age of 57.74 ± 10.5), who attended to Masoud Medical Laboratory, Tehran, Iran for a routine checkup, were included in the study. The healthy control subjects did not have autoimmune and inflammatory diseases, cancers, metabolite disorders, and immunodeficiencies, neither in themselves nor their immediate family members.

The diagnosis of CAD was accomplished in accordance with the visual evaluation of the coronary angiogram by cardiologist. A threshold of luminal narrowing greater than 50% in diameter seen in minimum one of the main coronary arteries or related main branches was regarded as validation for diagnosis of CAD. The clinical history of patients, such as risk factors related to the cardiovascular development, was obtained from CAD patients. The scores for blood pressure, glucose, and lipid profile were obtained from the medical records at the time of diagnosis, when the subjects were detected for CAD but were not under medication. Furthermore, there was a number of subjects that were newly diagnosed, which were also not under drug regimen for controlling blood pressure, glucose, and lipid profile. The patients were assessed for the presence of diabetes mellitus based on a raised fasting blood glucose (FBS) > 130 mg/dl. Individuals with a body mass index (BMI), which was determined through body weight divided by height squared (kg/m2), of higher than 30 was considered as obese patients. To determine the hypertension in the study participants, the seated blood pressure (BP) was measured (> 140/90 mmHg on two different occasions). Hypercholesterolemia was defined as a total cholesterol level above 200 mg/dl. Baseline features of the patients and healthy control individuals are described in detail in Table 1.

Table 1 Characteristics of study participants
Full size table

The local ethical committee of Iran University of Medical Sciences, Tehran, Iran approved the protocol of the study. Before sampling, all study participates signed the informed consent forms. Upon an overnight fasting, peripheral blood samples were obtained from all patients and control subjects in EDTA-treated vacuum tubes.

Genotyping of HPA polymorphisms by PCR-SSP

The DNA content was extracted from blood samples by the salting-out approach [14]. After dissolving the DNAs with RNase-free water, samples were stored at 4 °C for pending assays. In order to genotype eight HPA polymorphisms [including HPA-1 T196C (rs5918), HPA-2 C524T (rs6065), HPA-3 T2622G (rs5911), HPA-4 G526A (rs5917), HPA-5 G1648A (rs1062535), HPA-6 A1564G (rs13306487), HPA-9 A2603G (rs137852907), and HPA15 A2108G (rs10455097)], the polymerase chain reaction with sequence-specific primers (PCR-SSP) approach was employed, as already described [15]. The detection of two different alleles through PCR-SSP technique depends on the Taq polymerase inability to repair a single base mismatch located in the 3′-end of a primer. The amplification of the target region is happened if a complementary matching of the 3′-end of primer occurred to the sequence at the allelic polymorphism region. Otherwise, mismatching of the primer and sequence of the allelic variation leads to no amplification. Wild-type and variant HPA alleles for each locus were assigned as “a” and “b”, respectively. The thermocycling program of the PCR were: 1 cycle of 95 °C for 2 min, then followed by 10 cycles of 95 °C for 10 s and 65 °C for 1 min, then 20 cycles of 95 °C for 10 s, 61 °C for 50 s and 72 °C for 30 s, finally holding at 4 °C. The thermocycling conditions of the PCR were in accordance of the previous recommendation, with slight alterations on the annealing temperature of the primers (Table 2). In order to detect each allele of the HPA polymorphisms, two sets of primers, one for allele-specific and another for the common allele, were employed (Table 2) [16]. After performing electrophoresis of the amplified samples on the agarose gel (2% w/v) stained with DNA safe stain, discrimination of the alleles was conducted through direct observation of the products. Figure 1 illustrates the electrophoretic bands related to each allele of the determined HPA polymorphisms.

Table 2 Primer sequences, mixes, and their specificities in PCR-SSP assay
Full size table
Fig. 1
figure 1

Gel electrophoresis of PCR-SSP products for HPA genotyping. Representative typing result revealing identification of homozygous a/a (HPA 1, 4, 5, 6 and 9) heterozygous a/b (HPA 2, 3 and 15). The upper arrow indicates a 429 bp of human growth hormone gene as internal amplification control for HPA 1,2,3,4,6,9 and a 607 bp of DRα gene as internal control for HPA 5 and 15, while the lower arrow indicates specific HPA allele. Full-length gel images are presented in Additional file 1: Fig. 1

Full size image

Statistical analysis

The gene-counting approach was used to determine the frequency of the alleles for each polymorphism of HPAs. The Fisher’s exact or Pearson’s chi-squared tests was implemented in order to determine the deviation of genotype frequencies in the control group from Hardy–Weinberg equilibrium (HWE). Univariate and then multivariate logistic linear regression analyses were employed to calculate the odds ratios (ORs) and corresponding 95% confidence intervals (CIs). The differences in the frequencies of the allele and genotype of HPA polymorphisms were determined using Fisher’s exact or Pearson’s chi-squared tests. The expectation maximization approach was carried out in order to estimate the HPA haplotypes using the online SHEsis software [17]. The correction of P values in more than 2 comparisons was conducted by the Bonferroni method. The relative risks were adjusted for the confounding variables, such as diabetes mellitus, hypertension, BMI, total cholesterol, and triglycerides. The difference between numerical variables was determined through Mann–Whitney U test to compare the means between CAD patients and healthy controls. A P value < 0.05 was regarded as the statistical level of significance. The data analysis was conducted using SPSS v.22 software. Presentation of data was done through mean ± standard deviation (SD) and percentage fraction of the total value for continuous and nominal variables, respectively.

Results

Frequency of the allele and genotypes of the HPA polymorphisms

Table 3 shows the frequency of the alleles and genotypes of each HPA polymorphism in both patient and control groups. No deviation from HWE was detected for the genotype distribution of the HPA polymorphisms in the control group.

Table 3 Allele and genotype distribution of HPA polymorphisms in CAD patients and healthy controls
Full size table

The distribution of the HPA alleles and genotypes did not show significant differences between CAD patient and healthy control groups. It was observed that the HPA-15b allele frequency was the highest in patients and healthy control subjects. The homozygous HPA-15b/15b and HPA-3b/3b genotypes were detected in high prevalence in patient and healthy control groups. The frequencies of the alleles and genotypes of HPA-4b, HPA-6b, and HPA-9b polymorphisms were not seen to have any differences between patients and controls, and therefore were omitted from further analysis (Table 3).

Haplotype frequencies

The analysis of haplotype was based on three variants, including HPA1, HPA2, and HPA3. Among the eight identified HPA haplotypes, none of them indicated statistically significant differences between CAD patients and controls. In addition, upon performing the Bonferroni correction, it was observed that the differences were not significant for HPA haplotypes between patients and control subjects (Table 4).

Table 4 HPA haplotypes of HPA 1–3 in patients and controls
Full size table

Regression analysis

The frequency of all potential haplotypes did not show statistically significant differences between CAD patients and healthy controls, according to the univariate regression analysis (Table 5). However, when the HPA-1a/2a/3a haplotype was considered as reference (OR = 1.00), there was a statistically significant association of HPA-1b/2a/3b (P = 0.015, OR = 2.792, 95% CI 1.45–8.59) with CAD risk in the multivariate regression analysis upon adjusting for the confounding factors (Table 5).

Table 5 Univariate and multivariate regression for haplotypes of HPA1-3 polymorphisms
Full size table

Discussion

Here we evaluated the association of eight HPA polymorphisms with CAD in an Iranian population. Our findings indicated that the frequencies of all HPA alleles and genotypes were not significantly different between CAD patients and healthy controls. Moreover, there was no significant association of HPA haplotypes as independent risk factors with CAD development in the Iranian population. Nonetheless, after controlling for traditional CAD risk factors, our data supported the involvement of the HPA haplotype (1b/2a/3b) with CAD risk.

A study in a Japanese population reported no association of HPA1-6 genotypes with MI, which was in line with our results [18]. Our study is also consistent with a recent Tunisian study that reported the association of haplotypes containing HPA-1b allele, such as 1b/2a/3a and 1b/2a/3b with CAD risk. This association was still significant when it was adjusted for the traditional risk factors involved in the CAD development [19]. Our findings are in line with the results of prior research performed by Floyd et al. in the UK. Their results did not find any association between HPA-1 polymorphism and CAD in patients over 45 years old. Nonetheless, the presence of the HPA-1b allele was considered as a risk factor for development of cardiovascular diseases in younger patients (≤ 45 years). It appeared that the relative effect of this polymorphism is decreased considerably with increasing in age and the presence of risk factors, such as blood pressure, diabetes, and cholesterol [20]. Nevertheless, our results are in apparent disagreement with previous reports indicating a positive association of HPA-1b and HPA-3b alleles with the risk of CAD in Tunisian patients [19], platelet hyper-reactivity in ACS [21, 22], and increased thrombotic complications [8, 23, 24].

Our study confirms the study of Kvasnicka et al. on HPA-1 and HPA-5 polymorphisms in a large case–control study involving 2369 cardiovascular patients with a history of the Vein thrombo embolism (VTE). Based on their statistical analysis, the allele frequency of the HPA-1 and HPA-5 polymorphisms did not associate with susceptibility to CAD [25]. This paper also proposes robust evidences along with Wei et al. study on HPA-1 and HPA-2 polymorphisms in Coronary heart disease (CHD) patients with more than 50% diameter stenosis. They showed that there was no relationship between the alleles and genotypes of HPA-1 and HPA-2 polymorphisms and the incidence of CAD [26]. In contrast, Zhang et al. proposed the HPA-2b allele as a major risk factor for CHD disease in Chinese population. They reported that the frequency of HPA-2a/2b and HPA-2b/2b genotypes had a significant relationship with the incidence of the disease. Nonetheless, a meta-analysis of 25 case–control studies demonstrated a significant association between HPA-2b allele and HPA-2a/2b and HPA-2b/2b genotypes with incidence of CAD [27, 28].

Our findings shed additional light on the conception that, whereas individual genetic variations possess a confining impact on CAD proneness, the haplotype analysis permits valid recognition of cases at high- and low-risk in the development of CAD [29, 30]. HPA-1a/1b, -2a/2b, -3a/3b are located on the GPIIIa, GPIbα, and GPIIb, respectively, which are the most frequent GPs and are important in the immunologic reactions. Genetic polymorphisms of these antigens may increase the adhesion tendency of the platelets to the harmed endothelium [11]. Therefore, specific HPA haplotypes may promote the activation, aggregation, and adhesion of platelets to the vessel endothelium during pathological conditions and the presence of risk factors like high blood pressure. These events may eventuate in the narrowing of the vessel intima and development of atherosclerotic plaques through recruitment of further inflammatory leukocytes to the site of injured endothelium [9, 10, 31]. Our analysis indicated increased risk of CAD susceptibility in cases harboring the HPA1b/HPA2a/HPA3b haplotype.

Based on our data, no associations of homozygous HPA-3b/3b genotype and HPA-3b allele were identified with predisposition to CAD in the Iranian population. These reports are in agreement with a study in German population, which indicated that there were no associations of both HPA-1 and HPA-3 variants, in the allelic, genotypic or haplotypic analysis, with risk of MI or CAD susceptibility [32]. However, it was observed that HPA-3b/b had a protective role in the young male (< 56 years of age) from Korean CAD cases [33]. By contrast, this is in apparent disagreement with reports of Lekakis et al., which indicated that HPA-3b allele and HPA-3b/3b genotype did not associate with the intensity of coronary thrombosis in patients from Greece [34]. Although these incongruities remain to be speculated, they might stem from varieties in the diagnostic criteria of the patients or differences in the number of patients or control subjects included [18, 35], as well as the differences in the ethnicity of the study participants [18, 32, 33, 36]. For instance, HPA-1b prevalence has been reported to be higher in Iranian healthy individuals (11%) than African (8%) [37], and Southeast Asians (1%) [38]. On the contrary, prevalence was lower than for Northern Europe (14–19%) [39, 40], American populations (19.1%) [24], and Tunisians (45.4%), which is the utmost prevalence identified to date for all studied population ever [19].

Our data did not support any association of HPA polymorphisms with CAD in Iranian population. However, there was an association between the HPA haplotypes and CAD susceptibility after adjusting for traditional risk factors of CAD using the regression analysis models to determine the contribution of haplotypes for CAD development. It should be noted that the patients usually undergo a drug regiment to control blood pressure, glucose, and lipid after diagnosis of CAD. We used the recorded data of the patients before initiation of medication, not follow-up period. This issue could be contributing in obtaining solid and straightforward results in the analysis that could, otherwise, confer biased outcomes.

Among the limitations and caveats of the current study were the relatively small number of subjects, the retrospective case–control design of the study, and the HPA polymorphisms analyzed. As a consequence, the interpretation of these data should be conducted cautiously considering the platelet function in CAD, as the platelet functions in healthy individuals probably differ from that of CAD patients, in which other items may also impress the physiology of platelets. We suggest a prospective study with a greater sample size for higher confidence level in approaching our results. We also suggest to investigate major adverse cardiac events within the formation of plaque in vessels and to explore their association with platelet antigens polymorphism.

Conclusion

Considering all the results, this was the first replication study of HPA polymorphism association with CAD risk in an Iranian population. In spite of non-significant association of alleles, genotypes, and haplotypes of HPA polymorphisms with CAD risk, HPA1b/2a/3b haplotype was detected to be dependent disease risk after adjustment for confounding factors. Being armed with the comprehensive knowledge of the functional implications of the genetic polymorphism in HPAs might be useful to stratify the patients based on the inherited risk factors for thrombosis, which in turn, might be beneficial in devising and developing novel treatment options to monitor and manage the arterial thrombosis in CAD patients. To comment with certainty on the implications of the HPA polymorphisms in the pathogenesis of CAD, further independent studies in different populations exerting larger sample sizes will be contributing.

Availability of data and materials

Not applicable.

Abbreviations

CAD:

Coronary artery disease

HPA:

Human platelet alloantigens

PCR-SSP:

Polymerase chain reaction-sequence-specific primers

GP:

Glycoproteins

BP:

Blood pressure

SD:

Standard deviation

HWE:

Hardy–Weinberg equilibrium

OR:

Odds ratios

CI:

Confidence intervals

MI:

Myocardial infarction

VTE:

Vein thrombo embolism

CHD:

Coronary heart disease

ACS:

Acute coronary syndrome

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Acknowledgements

We are grateful to staffs in the Department of Immunology, School of Medicine, Iran University of Medical Sciences, for their persistent contribution to this project.

Funding

This study was financially supported by grants from Iran University of Medical Sciences and Tehran University of Medical Sciences (Grant No. 17657). The funding body played no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.

Author information

Authors and Affiliations

  1. Immunology Research Center (IRC), Institute of Immunology and Infectious Disease, Iran University of Medical Sciences, Shahid Hemmat Highway 14496, Tehran, Iran

    Farideh Malakootikhah, Hossein Naghavi & Nader Tajik

  2. Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

    Farideh Malakootikhah

  3. Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran

    Negar Firouzabadi

  4. Cardiovascular Intervention Research Center, Shaheed Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran

    Mohsen Maadani

  5. Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran

    Massoumeh Shafiei

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Contributions

FM: Performed the experiments, participated in manuscript drafting, and read the manuscript critically. HN: Performed the statistical analysis, participated in manuscript drafting, and read the manuscript critically. NF; Participated in conducting the experiments, participated in manuscript drafting, and read the manuscript critically. MM: Performed the patient diagnosis, participated in manuscript drafting, and read the manuscript critically. MS: Participated in manuscript drafting, and read the manuscript critically. NT: Developed the main idea, participated in manuscript drafting, and read the manuscript critically. All authors read and approved the final manuscript.

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Correspondence to Nader Tajik.

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Research carried out here were in compliance with the Helsinki Declaration. The protocol of this study was approved by the Human Research Ethics Committee from the Iran University of Medical Sciences, Tehran, Iran (Reference No. 17657). Written informed consent forms were obtained from patients and healthy controls before blood taking.

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Additional file 1: Fig. 1

. The gele electrophorosis image of the PCR products for different samples.

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Malakootikhah, F., Naghavi, H., Firouzabadi, N. et al. Association of human platelet alloantigens encoding gene polymorphisms with the risk of Coronary artery disease in Iranian patients. BMC Cardiovasc Disord 21, 68 (2021). https://doi.org/10.1186/s12872-021-01892-z

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Keywords

BMC Cardiovascular Disorders

ISSN: 1471-2261

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