Submitted: 06 Dec 2019
Revision: 13 Jul 2020
Accepted: 27 Jul 2020
ePublished: 05 Sep 2020
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J Cardiovasc Thorac Res. 2020;12(3): 214-221.
doi: 10.34172/jcvtr.2020.37
  Abstract View: 77
  PDF Download: 89

Original Article

Relationship of hypomethylation CpG islands in interleukin-6 gene promoter with IL-6 mRNA levels in patients with coronary atherosclerosis

Monireh Mohammadpanah 1 ORCID logo, Mohammad Mehdi Heidari 1* ORCID logo, Mehri Khatami 1 ORCID logo, Mehdi Hadadzadeh 2 ORCID logo

1 Department of Biology, Faculty of Science, Yazd University, Yazd, Iran
2 Department of Cardiac Surgery, Afshar Hospital, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
*Corresponding Author: Mohammad Mehdi Heidari, Email: Heidarimm@yazd.ac.ir


Introduction: Atherosclerosis is the important cause of most cardiovascular diseases, with high prevalence and mortality. Atherosclerosis is not only a lipid metabolism disorder but also recently is defined as a chronic inflammatory disease. Several studies showed that interleukin-6 (IL-6) is involved in the pathogenesis of atherosclerosis. The aim of the present study is the examination of IL6 mRNA Levels and hypomethylation of IL6 promoter in atherosclerosis patients.
Methods: In this assay, a total of 35 cases with atherosclerosis and 30 controls were enrolled. RNA and DNA were isolated from the peripheral blood of all samples. Mean IL6 gene expression was determined by RT-PCR and methylation status at six CpG motifs in IL6 promoter was determined using bisulfite genomic sequencing.
Results: Real Time-PCR analysis results showed the mean IL6 RNA level in atherosclerosis patients candidate for CABG (coronary artery bypass grafting) was significantly higher than controls (P value = 0.01). Also, the upstream CpG motifs (-1038 to -952) in IL6 promoter were predominantly unmethylated in patients than in the controls (P value = 0.01).
Conclusion: These findings suggest that an increase in IL-6 gene expression and its DNA hypomethylation promoter are associated with atherosclerosis patient’s candidate for CABG surgery.
Keywords: Atherosclerosis, Interleukin-6, DNA Methylation, Gene Expression
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