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The Endothelial Nitric Oxide Synthase Gene Polymorphism is Associated with the Susceptibility to Immunoglobulin a Nephropathy in Chinese Population

Gao J.a · Wang M.b · Wei L.a · Niu D.c · Wei J.d · Ou Y.a · Jin T.e · Yu Q.f · Liu X.b · Tian T.b · Dai C.b · Fu R.a · Wang L.a

Author affiliations

aDepartment of Nephrology, Second Affiliated Hospital of Xi’an, Xi’an, China
bDepartment of Oncology, Second Affiliated Hospital of Xi’an, Xi’an, China
cDepartment of Nephrology, First Affiliated Hospital of Xi’an, Jiaotong University, Xi’an, China
dDepartment of Nephrology, Hainan general hospital, Haikou, China
eNational Engineering Research Center for Miniaturized Detection Systems, School of Life Sciences, Northwest University, Xi’an, China
fDepartment of Pathology, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China

Corresponding Author

Li Wang, MD, PHD

Department of Nephrology,

Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an (China),

Tel. +86-29-8767-9917, Fax +86-29-8767-9917, E-Mail lemonwine@126.com

Key Words: Endothelial nitric oxide synthaseRs1799983Rs2070744Single-nucleotide polymorphismsIgA nephropathyRisk

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Kidney Blood Press Res 2017;42:608–616
https://doi.org/10.1159/000481421

Abstract

Background/Aims: Endothelial nitric oxide synthase (eNOS) is one of the most important enzymes for producting nitric oxide (NO), which regulate the function of many organs and cells. The single nucleotide polymorphisms (SNPs) of eNOS were found to be associated with many kidney diseases. However, it is lack of relevant studies to evaluate the associations between eNOS polymorphisms and immunoglobulin A nephropathy (IgAN). This case-control study aimed to evaluate the relationship between eNOS polymorphisms and IgAN. Methods: We recruited 351 IgAN patients and 310 age- and sex-matched healthy controls from Northwest China. Sequenom MassARRAY was used to detect the genotypes of two common eNOS SNPs (rs1799983 and rs2070744). Odds ratios (ORs) and 95% confidence intervals (95% CIs) were calculated by the Chi square test to evaluate the associations between eNOS and IgAN. Phase 2.1 was used to conduct haplotype analysis. Results: In the overall analysis, we found that the rs1799983 polymorphism was associated with a decreased risk of IgAN (G/T vs. G/G: OR=0.57, 95%CI=0.34–0.96; G/T+T/T vs. G/G: OR=0.52, 95%CI=0.31–0.86; G/T vs. G/G-T/T: OR=0.60, 95%CI=0.36–0.99; Log-additive model: OR=0.48, 95%CI=0.30–0.78). Haplotype analysis indicated that Trs1799983Crs2070744 is a protective factor against IgAN (OR=0.62, 95%CI=0.42––0.92). However, no significant differences were found between the two SNPs (rs1799983 and rs2070744) and clinical features (age, sex, blood pressure, and Lee’s grade) of IgAN. Conclusion: The eNOS gene rs1799983 polymorphism and Trs1799983Crs2070744 haplotype may reduce the risk of IgAN in Chinese populations.

© 2017 The Author(s). Published by S. Karger AG, Basel

Introduction

Immunoglobulin A nephropathy (IgAN), also known as Berger’s disease because it was first described by Berger and Hinglais [1], is the most common primary glomerulonephritis worldwide and the most common disease leading to end-stage renal disease (ESRD) [2]. The disease occurs at any age, particularly among the adolescents and young adults with a male-to-female ratio 2: 1 or 3: 1 [3]. Until now, four processes were suggested to be involved in IgAN development. Firstly, higher levels of IgA1 with galactose-deficient O-glycans in the hinge-region were observed in IgAN patients (Hit 1). Secondly, antibodies recognized these antigenic determinants to form and deposit immune complexes (Hit 2 and 3). Finally, these immune complexes activate mesangial cells to proliferate and secret extracellular matrix, cytokines, and chemokines, which lead to renal injury (Hit 4) [4]. Genetic factors have been demonstrated to be crucial in the development and progression of IgAN. Genome-wide association studies indicated that multiple gene polymorphisms were associated with the susceptibility to IgAN [5-7].

Nitric oxide (NO) is an endothelium-derived relax factor that can dilate blood vessels, relax vascular smooth muscle, and inhibit endothelial cell proliferation and platelet aggregation [8]. Its synthesis depends on NO synthase (NOS), which oxidizes L-arginine to L-citrulline. There are three important informs of NOS in humans: neuronal NO synthase, inducible NO synthase, and endothelial NO synthase (eNOS) [8, 9]. Endothelial cells that produce NO rely on eNOS, a multi-domain enzyme that uses several cofactors including tetrahydrobiopterin, nicotinamide-adenine -dinucleotide phosphate, flavin adenine dinucleotide, and flavin mononucleotide [8, 10]. The human eNOS gene is located on chromosome 7q35-36, with a length of 21 kb containing 25 introns and 26 exons [11]. eNOS is related to the dysfunction of endothelial cells, and normal eNOS function promotes pathological vascular repair, and protects against complications such as hypertension, atherosclerosis, and diabetes [10].

NO, produced by renal tubular epithelial cells and mesangial cells, plays an important role in regulating renal hemodynamic and tubular function [11, 12]. Decreased NO levels may be important in the progression of renal disease [13]. Polymorphisms in eNOS have been demonstrated to be associated with NO levels in the serum [14]. Additionally, several studies showed that eNOS polymorphisms were related to many renal diseases, including diabetic nephropathy (DN) [15-17], polycystic kidney disease [11], and lupus nephritis [18]. However, the relationship between single-nucleotide polymorphisms (SNPs) of eNOS and IgAN remains unclear. We conducted a case-control study, selecting two common loci in eNOS gene, G894T missense mutation (rs1799983) and T786C (rs2070744), to evaluate the influence of eNOS on IgAN.

Materials and Methods

Ethics statement

The study protocol was approved by the ethics committee of the Second Affiliated Hospital of Xi’an Jiaotong University. All participants signed informed consents before they were in for this experiment.

Population

This hospital-based study enrolled patients with IgAN from Northwestern China who visited to the First and Second Affiliated Hospital of Xi’an Jiaotong University during March 2009 to April 2014. All patients were pathologically confirmed by renal biopsy. The age- and sex-matched healthy controls were recruited from healthy examinations in the same hospitals during the same period. Participants were excluded if they had other renal diseases such as DN, lupus nephritis, and other secondary IgAN, or if they were not Han Chinese. Demographic and clinical characteristics were collected from the medical records and a self-administered questionnaire was completed by the participants. The information including age, gender, 24-h urine protein, blood pressure, serum creatinine level, blood urea nitrogen, serum albumin level, serum cholesterol level, serum IgA level, serum C3 level, and histopathological grade (Lee’s classification) were recorded. Lee’s classification is a method for determining pathological type, it relies on the severity of glomerular and interstitial lesions (I: glomerular, tubular and interstitial lesions are normal; II: focal hyperplasia in glomerular and tubular lesions, and interstitial lesions are normal; III: diffuse hyperplasia in glomerular lesions, focal atrophy in renal tubular lesions and interstitial edema; IV: less than 45% glomerular lesions with crescent and sclerosis, multifocal atrophy, and fibrosis in tubular and interstitial lesions; V: more than 45% glomerular lesions with crescent and sclerosis, and tubular and interstitial lesions are more serious than those of IV). Additionally, participants lacking detailed information were excluded.

DNA extraction and genotyping

Tubes containing ethylene diaminetetraacetic acid were used to collect approximately 2 mL peripheral venous blood samplesfrom each participant. The serum was collected by centrifuging the whole blood at 1500 rpm for 10 min and then stored at –80°C until use. The DNA was extracted according to the instructions of the GoldMag DNA Purification Kit (GoldMag Co. Ltd, Xi’an City, China). The purity and concentration of DNA were measured utilizing an ultraviolet spectrophotometer (Nanodrop, Thermo Scientific, Waltham, MA, USA). Sequenom MassARRAY RS1000 was used to detect the genotypes of two common eNOS SNPs (rs1799983 and rs2070744). The primers used for each SNP are listed in Table 1. SequenomTyper 3.0 Software (San Diego, CA, USA) was used for data analyses.

Table 1.

Primers used for this study

/WebMaterial/ShowPic/878640

Statistical analyses

Microsoft Excel (version 2007, Microsoft, Redmond, WA, USA) was used for data analysis. SPSS software (version 21.0, SPSS, Inc., Chicago, IL, USA) was used for statistical analyses. Hardy-Weinberg equilibrium was tested by Fisher’s exact test for each SNP in controls. The Student t-test or the Chi square test (χ2 test) was used to examine the differences in distributions of demographic characteristics between patients and controls. Odds ratios (ORs) and 95% confidence intervals (95% CIs) were calculated by χ2 test to evaluate the associations between eNOS and IgAN. All tests were two-tailed and P﹤0.05 was considered to indicate statistical difference. Five genetic models were used in our study: co-dominant model (including homozygote model and heterozygote model), recessive model, dominant model, over-dominant model, and Log-additive model. Phase2.1 software (downloaded from http://stephenslab.uchicago.edu/phase/download.html) was used to evaluate haplotypes and the χ2 test was used to estimate differences in each haplotype.

Results

Characteristics of the study participants

The study included 351 patients with IgAN (229 males and 122 females, mean age of 32 ± 11.9 years) and 310 age- and sex-matched healthy controls (186 males and 124 females, mean age of 35 ± 12.6 years), details as shown in our previous studies [19-21]. There were no statistically significant differences between the two groups in terms of age and sex (P﹥0.05).

Association between eNOS polymorphisms and IgAN risk

The genotype frequency distributions of the two selected SNPs (rs1799983 and rs2070744) are shown in Table 2. The detection rates of genotypes were greater than 95%, and only one patient’s information was missing for the rs1799983 polymorphism. Both SNPs in the controls were in Hardy-Weinberg equilibrium (P = 0.86, and P = 0.80, respectively). Rs1799983 was associated with a reduced risk of IgAN in all genetic models, except for the heterozygote model and recessive model (G/T vs. G/G: OR=0.57, 95%CI=0.34–0.96, P﹤0.0001; G/T+T/T vs. G/G: OR=0.52, 95%CI=0.31–0.86, P=0.01; G/T vs. G/G-T/T: OR=0.60, 95%CI=0.36–0.99, P=0.044; Log-additive model: OR=0.48, 95%CI=0.30–0.78, P=0.0027). However, no significant results were found for the association between rs2070744 and IgAN (all genetic models, P﹥0.05).

Table 2.

Genotype of eNOS polymorphisms among the cases and controls and the associations with IgAN risk (before and after adjusted by age and gender)

/WebMaterial/ShowPic/878639

Difference in allele frequencies of eNOS in cases and controls

The allele frequencies of rs1799983 and rs2070744 are shown in Table 3.The frequency of rs1799983 T allele in IgAN patients was significantly lower than in the healthy control group (OR=0.67, 95%CI=0.47–0.96, P=0.028). However, there was no statistically significant difference in the frequency distribution of the rs2070744 allele between IgAN patients and controls (P=0.695).

Table 3.

Allele frequencies of eNOS in case and control and the association with IgAN risk

/WebMaterial/ShowPic/878638

Haplotype analysis of eNOS polymorphisms and IgAN risk

We further conducted haplotype analysis to evaluate the effect of the interaction of rs1799983 and rs2070744 on IgAN. The results showed that people with the T rs1799983C rs2070744haplotype had a lower risk for IgAN than those who had the G rs1799983C rs2070744 haplotype (OR=0.62, 95%CI=0.42–0.92, P=0.017, shown in Table 4).

Table 4.

The haplotype frequencies of eNOS polymorphisms and IgAN risk

/WebMaterial/ShowPic/878637

Association between eNOS polymorphisms and clinical parameters of IgAN patients

IgA nephropathy is more common in males than in females. And, blood pressure, 24-h urine protein, and Lee’s grade are important for the prognosis of IgAN. Thus, we further performed subgroup analyses according to patient sex, blood pressure, 24-h urine protein, and Lee’s classification. However, we found no correlation between sex, blood pressure, 24-h urinary protein, or Lee’s classification in the two SNPs (all genetic models, P﹥0.05, shown in Table 5).

Table 5.

Subgroup analysis by clinical parameters for the association between eNOS SNPs and IgAN patients

/WebMaterial/ShowPic/878636

Discussion

Endothelial cell function and vascular tension can become unregulated in many organs, including the kidney. Abnormal levels of nitric oxide can lead to endothelial dysfunction, which may promote the occurrence and development of difference diseases, such as atherosclerosis, hypertension, hyperlipidemia, diabetes, and thrombosis disease [8, 16].

eNOS is mainly distributed in large and medium blood vessels, catalyzing the synthesis of NO from L-arginine and oxygen molecules [8]. The expression of eNOS can be influenced by transcription, mRNA stability, and phosphorylation level. Shear stress, exercise, and hypoxia were found to up-regulate the level of eNOS by enhancing transcription [22]. Additionally, lipopolysaccharide and tumor necrosis factor-α down regulated eNOS gene expression by damaging the stability of eNOS-mRNAs [22]. The phosphorylation and dephosphorylation of serine and threonine are important in the regulation of eNOS expression [23]. Statins, widely used in the treatment of cardiovascular diseases, were found to provide protection against cardiovascular diseases by increasing the bioavailability of NO via enhancing eNOS gene function [24]. NO can relax the efferent and afferent artery, increase glomerular filtration rate, and regulate renal sodium excretion [16, 25]. The level of serum NO was decreased in patients with ESRD, further promoting the occurrence of cardiovascular events, thus aggravating kidney injury [26]. Vascular endothelial damage in patients with ESRD reduced the synthesis of NO via disrupting the normal function of eNOS [27]. Abnormal hemodynamic function in the glomerulus may be involved in the pathogenesis of IgAN. Thus, we hypothesized that eNOS plays a role in IgAN risk. And, considering that several clinical and histological parameters such as severe proteinuria , arterial hypertension, hyperuricemia and glomerular sclerosis or tubulointerstitial scarring at renal biopsy may influence the progression [28-30], so that we further conducted subgroup analysis by clinical characteristics of IgAN patients.

The G894T (rs1799983) missense mutation in exon 7 leads to a single amino acid substitution from glutamate to aspartate at position 298 [15]. The T786C (rs2070744) polymorphism in the promoter of the eNOS gene at the eNOS-786 site results in the replacement of thymidine with cytosine, leading to compromised production of the eNOS enzyme in vivo by reducing promoter activity [15]. These two SNPs were demonstrated to be associated with various renal diseases. A recent meta-analysis suggested that the rs1799983 GG genotype is a protective factor for ESRD [31]. Studies performed in DN patients showed associations between eNOS SNPs and DN risk and prognosis. A meta-analysis conducted by Zhang et al. indicated that rs1799983 increases DN risk, while the relationship between rs2070744 and DN was not statistically significant [15]. However, few studies have focused on eNOS polymorphisms and IgAN. Zhang et al. found that eNOS G894T polymorphisms were correlated with high blood urea nitrogen and pathologic classification in IgAN patients, which may predict a poor prognosis of IgAN [32]. Rodríguez-Pérez et al. found no significant difference between G894T SNP and IgAN. However, the simultaneous presence of ACE DD variants and G894T GG variants was related to an unfavorable outcome as compared to other combinations [hazard ratio ranging from 4.7 (95% CI 1.52–14.33) to 8.4 (95% CI 2.45–29.10)] [33]. The results showed that the rs1799983 T allele may decrease IgAN risk, which is inconsistent with the results of Zhang et al. and Rodríguez-Pérez et al [32, 33]. We included 351 IgAN patients and 310 controls, which is a greater number of subjects than in previous studies, making our results more reliable. We first evaluated the association between the rs2070744 polymorphism and IgAN and the detailed clinical characteristics of IgAN patients were also analyzed. We further conducted haplotype analyses and found that the T rs1799983C rs2070744 haplotype may be a protective factor for IgAN compared to the G rs1799983C rs2070744 haplotype. This is the first study to evaluate the effect of the interaction of these two SNPs on IgAN risk. Several genome-wide association studies (GWAS) have also revealed some SNPs that associated with IgAN susceptibility. Gharavi AG et al. found SNPs in major histocompatibility complex, CFHR1 and CFHR3 contribute to 4-7% of the IgAN variance and tenfold variation in person risk [34]. HLA-DQB1/DRB1, PSMB9/TAP1, DPA1/DPB2, CFHR3/R1 and HORMAD2 were also suggested to be related to IgAN susceptibility [35]. Unfortunately, up to now, few GWAS studies have confirmed the association between eNOS polymorphisms and IgAN risk.

There were some limitations to this study. First, this was a single-center study, and thus bias is inevitable. More well-designed multi-center studies are needed to verify our results. Second, all participants were Han Chinese, which may restrict the large-scale application of our results to other ethnic groups. Third, the sample size of our study may not have been sufficiently large to identify differences in the subgroup analyses. Fourth, there were several clinical parameters, such as uric acid level, glomerular filtration rate, did not be analyzed because of lacking the data. Finally, this study was just focused on the different distribution of two SNPs in IgAN patients and health controls, so further functional studies and follow-up investigations are needed to perform in the future.

Conclusion

We found that the eNOS rs1799983 polymorphism and T rs1799983C rs2070744 haplotype might reduce the risk of IgAN in Chinese populations. However, additional well-designed large-scale studies are required to verify the molecular mechanisms of IgAN.

Disclosure Statement

The authors declare that they do not have any Disclosure Statements.

Acknowledgements

This work was supported by National Natural Science Foundation of China (No. 81470968, 81100530) and the Science and technology project of Shaanxi Province (2014K 11- 02- 04- 05).


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Author Contacts

Li Wang, MD, PHD

Department of Nephrology,

Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an (China),

Tel. +86-29-8767-9917, Fax +86-29-8767-9917, E-Mail lemonwine@126.com

Article / Publication Details

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Abstract of Original Paper

Received: December 16, 2016
Accepted: April 19, 2017
Published online: September 25, 2017
Issue release date: October 2017

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 5

ISSN: 1420-4096 (Print)
eISSN: 1423-0143 (Online)

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References

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2017, Vol.42, No. 3

October 2017

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J. Gao, M. Wang, and L. Wei contributed equally and therefore share first authorshipto.
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