Association of AGTR1 A1166C and CYP2C9∗3 Gene Polymorphisms with the Antihypertensive Effect of Valsartan

Liu, Yi; Kong, Xiaomu; Jiang, Yongwei; Zhao, Meimei; Gao, Peng; Cong, Xiao; Cao, Yongtong; Ma, Liang

doi:https://doi.org/10.1155/2022/7677252

International Journal of Hypertension

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Abstract Introduction Materials and Methods Results Discussion Conclusions Data Availability Ethical Approval Consent Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2022 | Article ID 7677252 | https://doi.org/10.1155/2022/7677252

Association of AGTR1 A1166C and CYP2C9∗3 Gene Polymorphisms with the Antihypertensive Effect of Valsartan

Yi Liu,¹Xiaomu Kong,¹Yongwei Jiang,¹Meimei Zhao,¹Peng Gao,¹Xiao Cong,¹Yongtong Cao,¹and Liang Ma¹

Academic Editor: Yimin Zhu

Received20 Aug 2021

Revised27 Jan 2022

Accepted12 Feb 2022

Published19 Mar 2022

Abstract

Background. The differences in the antihypertensive treatment with angiotensin type II receptor blockers (ARBs) may be attributed to polymorphisms in genes involving drug-targeted receptor and drug metabolism. The present study aimed to investigate whether the antihypertensive effect of the ARB drug valsartan was associated with angiotensin II type 1 receptor (AGTR1) gene polymorphism (A1166 C) and cytochrome P450 enzyme 2C9 (CYP2C9) gene polymorphism (CYP2C9∗3). Methods. 281 patients with hypertension who received valsartan monotherapy in the past month were included in this retrospective study. Polymerase chain reaction-melting curve analysis was performed to genotype the AGTR1 and CYP2C9 gene polymorphisms. Based on the systolic blood pressure (SBP) and diastolic blood pressure (DBP) at the time of visit, the patients were divided into well-controlled group (n = 144, SBP/DBP <140/90 mmHg) and poorly controlled group (n = 137, SBP/DBP ≥140/90 mmHg). Results. Older age, decreased history of drinking, a higher proportion of mild-to-moderate hypertension, lower alanine aminotransferase levels, and higher high-density lipoprotein cholesterol levels were observed in the well-controlled group than the poorly controlled group. Higher frequencies of the C allele and AC + CC genotype of AGTR1 A1166C were detected in the well-controlled than the poorly controlled patients ( = 0.005 and = 0.006). After adjustment for demographic and environmental factors, the CC + AC genotype of AGTR1 A1166C was markedly linked to better hypertension control with valsartan treatment compared to the AA genotype (odds ratio: 2.836, 95% confidence interval: 1.199–6.705, = 0.018). No significant difference was observed in the allele or genotype distribution of CYP2C9∗3 polymorphism between well-controlled and poorly controlled patients. Conclusions. The current data suggested that the AGTR1 A1166 C polymorphism may be associated with the antihypertensive effect of valsartan, and carriers with AC and CC genotypes may have a better antihypertensive efficacy response to valsartan treatment.

1. Introduction

Hypertension is a major risk factor for cardiovascular disease and end-stage renal damage, affecting about 40% of the adult population worldwide, leading to increased mortality [1–3]. A survey conducted between 2012 and 2015 revealed that 23.2% of Chinese adults and approximately 40% of adults aged 45 years and older had hypertension [4, 5]. Evidence from clinical studies have proven that efficient control of blood pressure (BP) reduces cardiovascular- and stroke-associated morbidity and mortality [6, 7]. However, hypertension is controlled in <10% of Chinese patients who receive antihypertension medication [8, 9].

Angiotensin type II receptor blockers (ARBs) are widely used for hypertension treatment globally, with well-established safety profiles, and are better tolerated than other classes of antihypertensive agents [10, 11]. Especially, valsartan has been leading China’s ARB market from 2011 to 2017, with high treatment adherence in patients with hypertension based on the prescription information in 2014 [12, 13]. However, antihypertensive responses to ARBs differ from one patient to another and single nucleotide polymorphisms (SNPs) in genes involving drug-targeted receptors and drug metabolism are associated with this individual variation [14].

ARBs exhibit a BP-lowering effect by blocking angiotensin II receptor type1 (AGTR1), encoded by the AGTR1 gene, and mediate cardiovascular effects of angiotensin II, such as vasoconstriction, increased BP, and myocardial contractility [15]. In addition, ARBs are mainly metabolized by the hepatic cytochrome P450 2C9 (CYP2C9) encoded by the CYP2C9 gene and transformed into inactive/active forms [16, 17]. Several studies have shown that SNPs in AGTR1 and CYP2C9 genes contribute to the antihypertensive effect of ARBs [18–22]. Among these, two polymorphisms rs5186 of the AGTR1 gene or AGTR1 A1166C and rs1057910 of the CYP2C9 gene or CYP2C9∗3 were extensively studied in patients using different ARB agents or from different genetic backgrounds; however, the results were conflicting [16, 17, 19, 22, 23]. In addition, the data on the effect of CYP2C9 and AGTR1 polymorphisms on the antihypertensive efficacy response to valsartan were limited.

The present study aimed to investigate whether the antihypertensive effect of angiotensin receptor antagonist valsartan is associated with polymorphisms AGTR1 A1166C and CYP2C9∗3 in a Chinese population and provide information about the heterogeneity of antihypertensive drug responses, which would help the clinicians to make an informed decision about individualized medication for hypertension.

2. Materials and Methods

2.1. Study Design

This was a retrospective study of 281 Chinese patients, selected from 1682 patients with hypertension who visited China-Japan Friendship Hospital, Beijing, China, between January 2016 and December 2018. The present study was approved by the hospital Institutional Ethics Committee. Written informed consent was obtained from all individuals.

2.1.1. Patients

The inclusion criteria were as follows: (1) a definite diagnosis of hypertension (systolic BP, SBP ≥140 mmHg and diastolic BP, DBP ≥90 mmHg); (2) age >18 years and <65 years; and (3) antihypertensive treatment with valsartan 80 mg/day for at least 4 weeks before the visit to the hospital. The exclusion criteria were as follows: (1) secondary hypertension of any etiology; (2) poorly controlled diabetes, a history of malignant tumor, or severe complications, such as renal failure and nephritic syndrome; and (3) other drugs apart from valsartan used for antihypertensive treatment. The patient selection flowchart is presented in Figure 1.

Hypertension is classified as Grade 1, Grade 2, and Grade 3, and a BP control target of <140/90 mmHg (<130/80 mmHg for patients with diabetes or coronary heart disease) is recommended according to the 2018 guidelines of the European Society of Hypertension (ESH) and Chinese hypertension guidelines [24, 25]. In the present study, patients were divided into the well-controlled group and poorly controlled group, depending on whether they achieved the target BP levels.

2.1.2. Genotyping SNPs

Genomic DNA was extracted from peripheral blood samples using the QIAamp DNA Blood Mini Kit (Qiagen, Hilden, Germany). The purity and quantity of the extracted DNA were measured on a NanoDrop 1000 spectrophotometer (ThermoScientific, Waltham, MA, USA). Polymerase chain reaction (PCR)-melting curve analysis was performed to genotype these SNPs using a commercial kit (RIQIgen Biotech Co., Ltd., Wuxi, China), including specific primers and fluorescent probes for AGTR1 A1166C and CYP2C9∗3. The following thermocycling conditions were used for the PCR: pre-denaturation at 95°C for 2 min; 50 cycles of denaturing at 94°C for 30 sec, annealing at 56°C for 30 sec, and extension at 70°C for 30 sec. The subsequent melting analysis process included three steps: denaturation at 95°C for 30 sec; renaturation at 46°C for 60 sec followed by continuous fluorescence reading mode at 46–75°C with increasing temperature gradient at a rate of 0.3°C/s. The melting curves were analyzed on a Tianlong Gentier 96E PCR analysis system (Tianlong Science and Technology Co., Ltd., Xi’an, China) and matching software.

2.2. Statistical Analysis

Continuous variables were expressed as median (interquartile range), and categorical variables were presented as frequencies and percentages. The between-group data were compared using Mann–Whitney U test for continuous variables and χ² test for categorical variables. A goodness of fit χ² test was used to evaluate whether the genotype distributions of AGTR1 A1166C and CYP2C9∗3 polymorphisms were in accordance with Hardy–Weinberg equilibrium. The differences in genotype frequencies between groups were compared by χ² test or Fisher’s exact test. Because the CC genotype of AGTR1 A1166C polymorphism was extremely rare, a dominant genetic model (AA genotype vs. AC + CC genotype) was used in the logistic regression analysis. Univariable logistic regression analysis was used to evaluate the association between gene polymorphisms and the response to valsartan treatment, and the data were presented as unadjusted odds ratios (ORs) with 95% confidence intervals (CIs). Multivariate logistic regression was used to determine the factors associated with the antihypertensive efficacy of valsartan with adjustment for covariates: age, gender, body mass index (BMI), grade of hypertension, and history of drinking and smoking. The data were presented as adjusted ORs with 95% CIs. Statistical analysis was performed using SPSS version 20.0 (SPSS Inc., Chicago, USA), and < 0.05 was considered statistically significant.

3. Results

3.1. General Characteristics

There were 144 patients in the well-controlled group (achieving target BP levels) and 137 patients in the poorly controlled group (failing to achieve target BP levels). The demographic and clinical characteristics of the two groups are summarized in Table 1. Advanced age, less history of drinking, lower alanine aminotransferase (ALT) levels, and higher high-density lipoprotein cholesterol (HDL-C) levels were observed in the well-controlled group than the poorly controlled group (Table 1). Moreover, the grade of hypertension differed significantly between the two groups ( = 0.001). No differences were detected in other variables, such as gender, BMI, history of smoking, levels of total cholesterol, triglyceride, low-density lipoprotein cholesterol (LDL-C), creatinine, and estimated glomerular filtration rate (eGFR) between the two groups (Table 1).

3.2. Genotype Distributions of AGTR1 A1166C and CYP2C9∗3

The distribution of allele frequencies of AGTR1 A1166C and CYP2C9∗3 was in accordance with the Hardy–Weinberg equilibrium in both well-controlled and poorly controlled groups. The genotype and allele distributions of gene polymorphisms between the two groups are shown in Table 2. The genotype and allele frequencies of AGTR1 A1166C polymorphism differed between the well-controlled and poorly controlled group ( = 0.006 and = 0.005, respectively), while no significant difference was observed in the genotype or allele frequency of CYP2C9∗3 between the two groups ( = 0.239 and = 0.250, respectively). Only one patient carried the CC genotype of AGTR1 A1166C polymorphism; therefore, a dominant genetic model for AGTR1 A1166C (AA genotype vs. AC + CC genotype) was used in the subsequent analysis.

3.3. Association of Gene Polymorphisms with the Antihypertensive Effect of Valsartan

The association of AGTR1 A1166C and CYP2C9∗3 genotypes with the response to valsartan treatment was evaluated by univariate and multivariate regression analyses (Table 3). In terms of AGTR1 polymorphism, AC + CC genotype significantly increased the control rate of hypertension in patients with valsartan treatment compared to the AA genotype (AC + CC vs. AA: OR 2.988, 95% CI 1.340–6.661, = 0.007). However, in terms of CYP2C9 polymorphism, ∗1/∗3 genotype did not affect the hypertension control rate in valsartan treatment (∗1/∗3 vs. ∗1/∗1: OR 0.607, 95% CI 0.263–1.402, = 0.242). The results were similar after adjusting for age, gender, BMI, grade of hypertension, and history of drinking and smoking. In addition, age was also an independent factor affecting the response to valsartan treatment in the multivariate analysis (OR 1.035, 95% CI 1.004–1.067, = 0.028) (Table 3).

Considering the potential synergistic effect of AGTR1 A1166C and CYP2C9∗3 polymorphisms, the combined effect of AGTR1 A1166C and CYP2C9∗3 genotypes on the antihypertensive efficacy response to valsartan was further analyzed (Table 4). When the genotype of AGTR1 TT and CYP2C9 ∗1/∗1 was used as the reference, the combined genotype of AGTR1 AC + CC and CYP2C9 ∗1/∗1 showed a higher rate of hypertension control with valsartan treatment in the unadjusted and adjusted statistical models (unadjusted: OR 2.953, 95% CI 1.267–6.880, = 0.012; adjusted: OR 3.028, 95% CI 1.225–7.486, = 0.016). Also, the combined effect of other genotypes of AGTR1 A1166C and CYP2C9∗3 was examined, but no difference was observed in the unadjusted or adjusted statistical model.

4. Discussion

Hypertension is one of the most common modifiable cardiovascular risk factors. The effective control of hypertension to reduce the morbidity and mortality of cardiovascular diseases is a global goal [25]. Interindividual variation in the BP response to the commonly used antihypertensive drug ARB is attributed to environmental and genetic factors, such as the polymorphisms in the genes involving targeted receptor and drug metabolism [14, 26, 27]. In the present study, we analyzed the association of polymorphisms AGTR1 A1166C and CYP2C9∗3 with the antihypertensive effect of valsartan based on real-world data. High frequencies of the C allele and AC + CC genotype of AGTR1 A1166C were observed in the well-controlled hypertensive patients and the AC + CC genotype was linked to a higher rate of hypertension control with valsartan treatment after adjustment for demographic and environmental factors ( = 0.018). These findings suggested that carriers with AC and CC genotypes exhibit an adequate antihypertensive efficacy response to valsartan, and the C allele of AGTR1 A1166C may be an independent factor associated with good control of hypertension with valsartan treatment. However, the current study detected no significant difference in the allele or genotype distribution of CYP2C9∗3 polymorphism between well-controlled and poorly controlled patients. Moreover, CYP2C9∗3 polymorphism did not play a synergistic role in the effect of AGTR1 A1166C polymorphism on the antihypertensive response to valsartan.

The polymorphism AGTR1 A1166C located in the 3′ untranslated region of AGTR1 may influence the stability of the mRNA expression and might be involved in the cellular signaling mediated by the angiotensin II receptor [28, 29]. Previous studies have shown that AGTR1 A1166C is implicated in the hypertension risk and the sensitivity of ARBs; however, the conclusion is unanimous [14, 29–32]. Consistent with our findings, Sun et al. found that AGTR1 A1166C was associated with the antihypertensive response of candesartan in a Chinese population, and individuals with the AC genotype had a significant reduction of SBP after candesartan medication [23]. Dong et al. also observed an enhanced antihypertensive effect of irbesartan only in male patients with AC and CC genotypes of AGTR1 A1166C [33]. In another study on a large Chinese cohort (n = 1049), the decrease in BP was positively correlated with irbesartan concentration in the carriers with the C allele of AGTR1 A1166C, suggesting an impact of the interaction of AGTR1 polymorphism and irbesartan concentration on the antihypertensive response to irbesartan [27]. Conversely, the AGTR1 1166 C allele was not linked to the irbesartan concentration-BP response correlation in a Swedish study (n = 42). On the other hand, Konoshita et al. suggested that the AGTR1 A1166C polymorphism was not a predictor of the response to antihypertensive treatment with valsartan [32].

Similarly, the results from previous studies on the association between CYP2C9 polymorphism and the antihypertensive function of ARBs are contradictory. The CYP2C9∗3 polymorphism may lead to decreased activity of the CYP2C9 enzyme, which is widely studied in the Asian population [16–18, 34, 35]. The prodrug losartan is oxidized by the liver enzyme CYP2C9 and converted into an active form. Several studies implicated that the BP-lowering effect of losartan may be weakened in carriers with the CYP2C9∗3 polymorphism due to decreased activation of losartan [16, 35], while other ARBs, such as irbesartan and valsartan, need to be metabolized into inactive forms by the CYP2C9 enzyme. A previous study demonstrated that the patients with CYP2C9 ∗1/∗3 or ∗3/∗3 genotype showed a significant decrease in SBP and DBP compared to patients with ∗1/∗1 genotype [33], which is different from our findings that no impact of CYP2C9∗3 polymorphism on the antihypertensive effect of valsartan was observed. Hiltunen et al. [22] suggested that the reproducibility of studies on the correlation between antihypertensive response and gene polymorphism was low. The study did not identify the association of AGTR1 or CYP2C9 polymorphisms with the antihypertensive effect of ARBs by using GWAS technology. Among the top 20 SNPs associated with losartan response in the GENRES study [36], few SNPs overlapped in the other studies conducted by Hiltunen et al. [22].

Herein, we found that age may be an independent factor for the response to valsartan treatment in our study, and patients with well-controlled hypertension were slightly older than the poorly controlled group, which was rarely reported in other studies. The factors, such as dietary habits, medication compliance, and physical activity, may be the underlying reasons that need to be explored further. Hypertension may be affected by many factors, such as age, race, and gene-gene interactions, which provide a multigenetic and multifactorial antihypertensive response of ARBs [18]. In addition, different sample sizes may also be a reason for the conflicting results of previous studies.

Nevertheless, the present study had some limitations. First, the sample size is limited leading to a limited statistical power to detect association. However, this retrospective study included patients with essential hypertension treated with valsartan in a large tertiary hospital during a 3-year period. The exclusion criteria were reasonable, and allele frequencies were in accordance with the Hardy–Weinberg equilibrium. Therefore, the study population was representative and the results were reliable. Second, factors such as dietary habits, patient compliance, and pharmacokinetics of ARBs among patients with different genotypes were not evaluated. Finally, this study only selected two common gene polymorphisms. Whether other gene polymorphisms are involved in the individual variability in the antihypertensive response to ARBs needs further investigation.

5. Conclusions

The current study showed that the polymorphism AGTR1 A1166 C was significantly related to the antihypertensive effect of valsartan, suggesting that the C allele of AGTR1 is an independent factor associated with better control of hypertension under valsartan treatment. The CYP2C9∗3 polymorphism was not significantly related to the antihypertensive response to valsartan in this study. Thus, further prospective studies with a large sample size are needed to clarify the association between gene polymorphisms and the antihypertensive efficacy response of ARBs.

Data Availability

Data used to support the findings of this study will be available upon reasonable request.

Ethical Approval

This study was reviewed and approved by Ethics Committee of China-Japan Friendship Hospital.

Written informed consent was obtained from each subject in this study.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Authors’ Contributions

Yi Liu, Liang Ma, and Yongtong Cao participated in the study design and study conception. Yongwei Jiang, Meimei Zhao, Peng Gao, and Xiao Cong collected samples and conducted genotyping. Xiaomu Kong and Yi Liu performed data analysis. Yi Liu drafted the manuscript. All authors have read and approved the final manuscript for publication.

Acknowledgments

This study was supported by grants from Horizontal Scientific Research Project (Grant no: 2019-HX-28), Key Clinical Specialty Project of Beijing (Grant no: 2020), the National Natural Science Foundation of China (Grant no: 82074221), and Elite Medical Professionals project of China-Japan Friendship Hospital (Grant no: ZRJY2021-GG03).

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