DNA methylation patterns of peroxisome proliferator-activated receptor gamma gene associated with liver fibrosis and inflammation in chronic hepatitis B.

Abstract:

:Peroxisome proliferator-activated receptor gamma (PPAR gamma) is a nuclear receptor that regulates gene expression of inflammatory mediators in liver injury. Hepatitis B virus (HBV) suppresses the PPAR gamma-mediated transactivation in liver cancerous cell lines. However, the role of PPAR gamma in patients with chronic HBV infection has not fully demonstrated. Our present study was firstly to determine the clinical relevance of peripheral PPAR gamma mRNA levels in chronic hepatitis B (CHB) patients, and then, the DNA methylation of PPAR gamma promoter was investigated. Peripheral blood mononuclear cells (PBMCs) were isolated from 91 CHB patients and 18 healthy controls. The mRNA level of PPAR gamma was determined by quantitative real-time PCR; meanwhile, the CpG island methylation was assessed by methylation-specific PCR. CHB patients showed significantly lower mRNA level of PPAR gamma than healthy controls (P = 0.005). The mRNA level was decreased in HBV-DNA-positive group than HBV-DNA-negative group (P = 0.041). Interaction analysis demonstrated that the DNA methylation pattern was responsible for the suppression of peripheral PPAR gamma transcription in CHB patients (P = 0.003). Furthermore, the hypermethylation of PPAR gamma gene promoter was significantly associated with liver inflammation and fibrosis in CHB. In conclusion, DNA methylation patterns were responsible for the decreased mRNA level of peripheral PPAR gamma in CHB patients. Liver inflammation and fibrosis were found to be associated with hypermethylation of PPAR gamma promoter.

journal_name

J Viral Hepat

authors

Zhao Q,Fan YC,Zhao J,Gao S,Zhao ZH,Wang K

doi

10.1111/jvh.12048

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

430-7

issue

6

eissn

1352-0504

issn

1365-2893

journal_volume

20

pub_type

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