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PPAR gamma inhibits growth of rat hepatic stellate cells and TGF beta-induced connective tissue growth factor expression.

Abstract：

AIM:To investigate the effect of peroxisome proliferator-activated receptor gamma (PPAR gamma ) activation on the growth of rat hepatic stellate cells (HSC) and transforming growth factor beta (TGF-beta)-induced connective tissue growth factor (CTGF) expression. METHODS:After being treated with various amounts of the PPAR gamma natural ligand 15-deoxy-delta12,14-prostaglandin J(2) (15-d-PGJ(2)) or synthetic ligand GW7845, the status of HSC proliferation and apoptosis were detected by MTT assay and flow cytometry. Furthermore, HSC were treated with PPAR gamma -specific antagonist GW9662 prior to the addition of 15-d-PG J(2) or GW7845 and were subsequently stimulated with TGF- beta1. The mRNA and protein levels of CTGF expression were detected by semi-quantitative RT-PCR and Western blotting analysis. Morphological changes in the HSC were observed by electron microscopy. RESULTS:15-d-PGJ(2) and GW7845 markedly inhibited HSC proliferation and induced cell apoptosis in a dose-dependent manner. Furthermore, PPAR gamma ligands significantly suppressed TGF-beta1-induced CTGF expression (at both transcriptional and post-transcriptional levels) in HSC, and the inhibitory effect was dramatically, if not completely, abolished by pretreatment with GW9662, suggesting that the inhibition was indeed mediated by PPAR gamma. Moreover, morphological observation revealed that PPAR gamma activation caused obvious changes of HSC from activated to quiescent phenotype. CONCLUSION:The PPAR gamma ligand has a potent inhibitory effect on the growth of HSC and TGF-beta1-induced CTGF expression, which makes it a potential antifibrotic candidate for the treatment and prevention of hepatic fibrosis.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Sun K,Wang Q,Huang XH

doi

10.1111/j.1745-7254.2006.00299.x

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

715-23

issue

6

eissn

1671-4083

issn

1745-7254

journal_volume

27

pub_type

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