Clinical impact of echocardiography parameters and molecular biomarkers in heart failure: Correlation of ACE2 and MCP‑1 polymorphisms with echocardiography parameters: A comparative study
- Authors:
- Published online on: April 28, 2021 https://doi.org/10.3892/etm.2021.10118
- Article Number: 686
Abstract
Introduction
Heart failure still represents the leading cause of hospital admission in patients over 65 years of age. It is defined as a multifactorial disease, which involves environmental factors and genetic predispositions and severely affects the quality of life of these patients (1). Genetic polymorphisms are involved in the pathogenesis of heart failure, but also in disease progression, and they may influence clinical outcomes or therapeutic responses (2-10).
It is well known that the renin-angiotensin system (RAS) plays an important role in heart failure progression. Angiotensin converting enzyme (ACE) converts angiotensin I (Ang I) to angiotensin II (Ang II), and angiotensin converting enzyme 2 (ACE2) cleaves Ang I into Ang-(1-9) and Ang II into Ang-(1-7). Ang II has pro-inflammatory and pro-atherosclerotic effects, and promotes hypertrophy and fibrosis, while Ang-(1-7) reduces left ventricular remodeling and the infarcted area, protects against cardiac hypertrophy, therefore having a cardioprotective effect. By having an opposite effect on the cardiovascular system, ACE and ACE2 counteract each other to regulate heart function (1,3,11-16).
The ACE2 gene is located on chromosome Xp22. ACE2 is mainly expressed in cardiac tissue, the renal endothelium and in the blood vessels, and is widely expressed in human tissues and cells, except for red blood cells. Soluble ACE2 activity is a biomarker for heart failure and arterial hypertension (4,17-19). ACE2 genetic variants are associated with essential hypertension (20-23), coronary artery disease (20), heart failure (13), atrial fibrillation or left atrial remodeling (20).
Research studies have confirmed that ACE2 gene polymorphism rs4646156 is associated with higher left ventricular mass and septal wall thickness, left ventricular hypertrophy (LVH) in men, diabetic-related cardiovascular complications, and a higher risk for severe pectoris angina in women (20,21,24-29). ACE2 gene polymorphism rs4646174 is associated with arterial hypertension and is found frequently in patients diagnosed with pectoris angina without significant stenosis of the circumflex artery (25,27).
The molecular mechanism of chronic inflammation associated with cardiac-specific expression of MCP-1 and its role in heart failure has been described in previous research studies. Experimental studies showed a correlation between MCP-1 expression and increased mortality in congestive heart failure. MCP-1 -2518 A>G (rs1024611) polymorphism is frequently associated with coronary artery disease, non-familial dilated cardiomyopathy, myocardial infarction, ischemic heart disease, ischemic stroke, arterial hypertension and carotid atherosclerosis in patients with type 2 diabetes, underlying the role of MCP-1 in atherosclerosis initiation, coronary artery disease and myocardial infarction (30-35).
Identifying additional components of RAS and molecular pathways involved in the pathogenesis of heart failure may lead to novel molecular biomarkers which could represent the basis in developing novel therapeutic strategies for these patients, individualized therapeutic options which might improve therapy response, clinical outcomes, survival rates and quality of life of these patients.
Based on current data regarding the association of ACE2 and MCP-1 polymorphisms with heart failure and the importance of understanding molecular pathways underlying heart failure and targeting different genes in defining novel therapeutic strategies, our study aimed to evaluate three SNPs, ACE2 polymorphisms (rs4646156, rs4646174) and MCP-1 (rs1024611) and their potential correlation with echocardiography parameters involved in cardiac remodeling in patients diagnosed with heart failure.
Patients and methods
The study was observational, prospective, cohort type. The current study included 116 patients diagnosed with heart failure and admitted to the Departments of Cardiology from ‘Niculae Stancioiu’ Heart Institute, Clinical Rehabilitation Hospital and Municipal Clinical Hospital of Cluj-Napoca, Romania, between November 2017 and March 2019. The inclusion criteria were: Patients aged at least 18 years with symptomatic heart failure of New York Heart Association (NYHA) functional classes II to IV, high pro-BNP values (over 300 pg/ml in an acute setting and over 125 pg/ml in a non-acute setting). Our study excluded patients with congenital heart disease, primary pulmonary hypertension, secondary arterial hypertension, pericardial disease, sepsis, malignancies, recent coronary bypass surgery and severe valvular heart disease.
Written consent was obtained from each participant after they were provided information concerning genetic testing and the study design. Confirmation of protection and integrity of personal and clinical data of the included patients was also provided. The study was approved by the Ethics Committee of ‘Iuliu Hatieganu’ University of Medicine and Pharmacy, Cluj-Napoca, Romania, following the rules and principles of the Helsinki Declaration. Clinical data of these patients were collected by clinical questionnaires, physical examination and medical record evaluation: Age, body mass index (BMI), comorbidities, smoking status, diameter of the left atrium (LA), left ventricular end-diastolic and end-systolic diameter (LVEDD, LVESD), ejection fraction (EF) and left ventricular mass index (LVMI). Two blood samples (2 ml EDTA) were collected for each patient. One was utilized for evaluation of total cholesterol, low-density lipoprotein, high density cholesterol, triglycerides, fasting plasma glucose, urea, serum creatinine, NT-proBNP, while the other was used for genetic testing. We performed 2D echocardiography for all patients using an Epiq7 (Phillips) or Affiniti 50 (Phillips) or Arietta 60 (Hitachi) machine. Standard parasternal and apical views were performed to assess LV and LA dimensions. The anteroposterior diameter of the LA was measured in the parasternal long-axis view using two-dimensional windows. We performed the measurements of the left ventricle and its wall from a parasternal long-axis view at the level of the mitral valve leaflet tips perpendicular to the LV long axis using two-dimensional sections. LV ejection fraction (EF) was measured using Simpson biplane formula. LV mass was calculated using the linear method and the Cube formula as following: LV mass=0.8x1.04x [(IVS+LVID+PWT)3-LVID3]+0.6 g. IVS is the interventricular septum, LVID is LV internal diameter and PWT is inferolateral wall thickness. LV mass was indexed to body surface area. Left ventricular hypertrophy (LVH) was defined as LV mass index (LVMI) above 95 g/m2 in women and above 115 g/m2 in men (36). All patients included in our study followed standard medical management according to ESC guidelines for heart failure (37).
SNP genotyping
Whole blood was collected on EDTA samples. Genomic DNA was extracted using a commercial genomic kit (PureLink Mini Genomic DNA Kit; Invitrogen, Thermo Fisher Scientific, Inc.). Genotyping was determined for SNPs rs1024611, rs4646156 and rs4646174 for all participants using real-time polymerase chain reaction (qPCR) performed on a QuantStudio 3 system (Applied Biosystem; Thermo Fisher Scientific, Inc.). Predesigned TaqMan probes, containing the needed primers (codes C__2551619_10, C__2551617_20, C__2590362_10, Thermo Fisher Scientific, Inc.) were used.
The used amplification regime for genotyping included a pre-read stage of 30 sec at 60˚C, a hold stage of 10 min at 95˚C, a PCR stage, covering 40 cycles, each containing 15 sec at 95˚C and 1 min at 60˚C and finally, a post-read stage of 30 sec at 60˚C.
Statistical analysis was conducted using MedCalc Statistical Software version 19.2.1 (MedCalc Software Ltd.; https://www.medcalc.org; 2020). Quantitative data were tested for normality of distribution using the Shapiro Wilk test and were characterized by mean and standard deviation or median and 25-75 percentiles. Qualitative data are expressed as frequency and percentage. Comparisons between groups were made using the Student's t-test or Chi-square test, whenever appropriate. In order to ascertain which variables were associated with indexed LV mass, we used a multivariate linear regression. Variables that achieved a P-value of <0.2 in the univariate analysis, were introduced in the regression. A P-value <0.05 was considered statistically significant.
Results
Clinical and demographic data of the patients are reported in Table I. The mean age of the patients with heart failure was 69±8 years, 81% had arterial hypertension, 64% associated coronary artery disease and 48% had type 2 diabetes. The clinical features of the patients according to their genotype are presented in Table II. A total of 74.1% of GG carriers of ACE2 rs4646174 presented coronary artery disease with statistical significance (P=0.01).
Genotype distribution of the three single nucleotide polymorphisms (SNPs) is shown in Table III.
Echocardiographic parameters for the MCP-1 polymorphisms are presented in Tables IV and V. No statistical differences between the three groups was observed for the analyzed echocardiographic parameters for SNP 1024611 of MCP-1. In the dominant model we observed a statistically significant association between AA homozygotes and LVH (P=0.03 for LV mass, P=0.04 for indexed LV mass).
Echocardiographic variables for rs4646156 of ACE2 polymorphism are presented in Table VI. We observed a higher enlargement of the left atrium (P=0.007) for TT carriers and a dilatation of the left ventricle [end-systolic (LVESD) and end-diastolic diameters (LVEDD); P=0.003 vs. 0.001] for homozygotes AA. We noted a higher LV mass in the same group. No significant differences regarding ejection fraction (EF), interventricular and posterior wall dimensions of the left ventricle were observed. Homozygotes had the lowest EF of the left ventricle ranging from severe reduced EF (24.8%) and slightly reduced EF (51.2%), with AA homozygotes having the most affected systolic function of the LV.
Correlations of ACE2 polymorphism rs4646174 with echocardiographic parameters are presented in Table VII. We reported a statistically significant higher LVEDD and LV mass for homozygotes of the C allele. CC carriers had a tendency towards a lower EF (P=0.05).
We analyzed the influence that the clinical and demographic variables may have on one relevant echocardiographic measurement (Table VIII). Male sex and normal body weight were statistically significant associated with a larger LVMI. Patients with coronary disease had a tendency of a higher LVMI, but the statistical threshold was slightly surpassed.
In order to ascertain which variables were associated with the LVMI, we used a multivariate linear regression (Table IX). Patients with genotypes AG or GG for MCP-1 SNP 1024611 or with obesity were more likely to have lower LVMI.
Discussion
Myocardial remodeling plays an important role in the evolution of heart failure. It involves molecular, cellular and interstitial alterations as response to cardiac damage. The clinical spectrum of manifestations includes changes in geometry, mass, cavity diameter of the left ventricle, fibrosis and inflammation. Cardiac remodeling is linked to worsening of cardiac function. In spite of reperfusion therapy of myocardial infarction and evidence based medicine for heart failure, ventricular remodeling remains independently associated with heart failure (38-45).
There is still limited data regarding the implication of angiotensin converting enzyme 2 (ACE2) and monocyte chemoattractant protein-1 (MCP-1) polymorphisms in the pathophysiology of heart failure.
For MCP-1 rs1024611, no statistical association was observed between groups for the echocardiographic parameters, but in a dominant model (AA vs. AG+GG), AA carriers presented a significant left ventricular hypertrophy (LVH). After multivariate linear regression analysis, AA carriers associated a higher LV mass index (LVMI) in the dominant model.
LVH is an independent factor for cardiac mortality and develops in the first hours after a myocardial infarction (43,44).
In a previous study analyzing a large cohort, the minor allele of MCP-1 polymorphism rs1799864 was associated with heart failure and myocardial infarction in patients younger than 65 years (46). The GG genotype of SNP 1024611 was previously associated with coronary artery disease susceptibility and carotid atherosclerosis (33,47-49). Although all of our patients with GG genotype were associated with coronary artery disease, no further remarks regarding this observation can be made because of the small number of patients with this genotype in our study.
We observed a significant association of LV mass index (LVMI), left atrium (LA) and left ventricle (LV) dimensions with ACE2 rs4646156. Patients with AA genotype had a significant higher LVMI. Patients with TT genotype had higher LA dimensions. The association of rs4646156 and cardiovascular complication of diabetes type II was evaluated on an Uyghurs population. Our results are partially consistent with a study conducted by Liu et al, where patients with AA and AT genotypes presented significant LVH and lower ejection fraction (EF) (26).
We report in our study no statistical significance for the LVMI after multivariate linear regression analysis for the dominant model.
In our research study, there were no significant differences between groups regarding the systolic function of the LV. This finding is similar to a study by Patel et al (28) and the MONICA Augsburg echocardiographic substudy (29), where no significant differences for the systolic LV function were observed in men or women. In the MONICA Augsburg study, the rs4646156 T allele was significant associated with higher LV masses in men (29).
LA enlargement appears as a consequence of increased diastolic and systolic overloading. It can lead to the development of atrial fibrillation and has prognostic value. Some authors consider LA dilatation a marker of structural heart disease in context of left ventricular dysfunction, coronary artery disease or mitral valve diseases. An increased LA index was found to be associated with major adverse cardiac events in patients with and without atrial fibrillation (50-53).
In a study conducted by Luo et al, several SNPs of ACE2 [rs4240157, rs4830542 (CC+CT), rs4646155 (TT+CT)] were correlated with LA enlargement and the risk for atrial fibrillation, but rs4646156 was not evaluated in their study (20).
To the best of our knowledge, this is the first report evaluating an association of ACE2 rs4646174 polymorphism and echocardiographic parameters in heart failure. In our study, patients with a CC genotype had significant higher LV dimensions, based on the end-diastolic diameter and a significant higher LV mass. CC carriers had a tendency towards a lower EF, but without statistical significance. GG carriers had the highest prevalence of coronary artery disease compared to the other genotypes. Further clinical experimental studies using a larger sample size are awaited to test the risk of the G allele for coronary artery disease and the association of the C allele with cardiac remodeling in different ethnic populations with different associated pathologies.
In both analyzed SNPs of ACE2, homozygotes were associated with LV hypertrophy and dilatation of the LV, both consequences of adverse myocardial remodeling. Adverse reverse LV remodeling has important prognostic significance. It is an independent parameter associated with the risk of sudden cardiac death and major arrhythmic events (54,55).
In previous experimental studies, ACE2 was found to be involved in modulation of cardiac function and structure. Genetic mutation of ACE2 stimulated atherosclerosis and cardiac remodeling in ACE2-knockout mice. In humans, ACE2 expression was upregulated in the ischemic failing heart, in idiopathic dilated and ischemic cardiomyopathy. In another study, plasma levels of ACE2 were found to be correlated with the severity of heart failure (56-60). Similar to other genetic studies, our study lacks data regarding plasma ACE2 levels.
Genetic variants of ACE2 may influence cardiac structure in heart failure. Both tested ACE2 polymorphisms from our experimental study are located in introns. Previous studies suggest that intronic polymorphism may affect gene expression and are involved in the pathophysiology of various complex disorders (61-64). How these SNPs influence the expression and function of ACE2 need to be evaluated in future experimental studies.
ACE inhibitors have significantly decreased cardiovascular mortality and hospitalizations for heart failure with left ventricular dysfunction. A proper dose selection of this therapy is an important requirement in heart failure treatment. Despite an optimal treatment with ACE inhibitors, a large number of patients with heart failure present elevated Ang II levels (11). Clinical studies in the field of pharmacogenomics have revealed that antihypertensive treatment could be influenced by the ACE2 polymorphism. Female carriers of ACE2 T allele of rs2106809 have a reduced response to ACE inhibitors. In another study, Chinese female patients carrying the C allele of rs2106809 had a better response to ACE inhibitors (65,66). New therapeutic strategies enhancing the effect of Ang 1-7 or further reducing Ang II levels may have a future in heart failure therapy.
The present study has some limitations. The cohort size was limited in order to define initially potential correlations of genetic polymorphisms with echocardiographic parameters in patients diagnosed with heart failure. Further prospective larger sample studies are needed to validate our findings and establish novel correlation with clinical features or clinical outcome in patients diagnosed with heart failure. Our study included only Caucasians and it is unknown if our results can be applied to other ethnic groups. Regarding our study design, which was clinical and volunteer based, potential bias could exist.
In conclusion, our study showed a strong association between echocardiographic parameters of cardiac remodeling and SNPs of the ACE2 and MCP-1 genes in Caucasian patients with heart failure. ACE2 genetic polymorphism could have prognostic significance in heart failure and may also represent a target molecular biomarker for precise therapy for specific variants which might lead to future therapeutic approach in heart failure patients. Our future research studies will try to identify novel genetic variants involved in heart failure pathogenesis and define novel prognostic or diagnostic biomarkers in this pathology.
Acknowledgements
Not applicable.
Funding
Funding: The present study was supported by an institutional research grant from ‘Iuliu Hatieganu’ University of Medicine and Pharmacy, Cluj-Napoca, Romania (PCD 2016- no. 7690/86/15.04.2016).
Availability of data and materials
The datasets used during the present study are available from the corresponding author upon reasonable request.
Authors' contributions
MSP, AT and MDS performed the literature research and drafted the manuscript. MSP, ADB and SCV designed the study. APT performed the genetic analyses. MSP, OS, DEP, AEM, and SCV acquired the data and performed data analysis and interpretation. DP and HSR contributed to overall review of the study and manuscript modification. ADB and SCV critically revised the manuscript. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The study was approved by the Ethics Committee of ‘Iuliu Hatieganu’ University of Medicine and Pharmacy, Cluj-Napoca, Romania (registry no. 403/8.11.2017). Signed informed consent was obtained from each patient for the inclusion in this study.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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