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Regulation of hepatic stellate cell proliferation and collagen synthesis by proteinase-activated receptors.

Abstract：

BACKGROUND/AIMS:Thrombin and MC tryptase, which are agonists for proteinase-activated receptors-1 and -2, respectively, are both increased in injured liver. We have examined if rat stellate cells express these receptors and if receptor agonists influence stellate cell activation. METHODS:Expression of mRNA for proteinase activated receptors-1 and -2 were examined by RT-PCR and Northern blotting in lysates of cultured stellate cells and receptor protein examined by Western blotting. The effects of receptor agonists on cell proliferation and collagen synthesis were examined by 3H-thymidine and 3H-proline incorporation assays, respectively. RESULTS:Rat stellate cells activated by culture on plastic showed a progressive increase in expression of proteinase-activated receptor-1 and -2 mRNA and proteinase-activated receptor-2 protein as they transformed to a myofibroblastic phenotype. Proteinase-activated receptor-1 agonists thrombin and the peptide SFFLRN, and proteinase-activated receptor-2 agonists tryptase and the peptide SLIGRL induced stellate cell proliferation and the rapid phosphorylation of 44 and 42 kDa mitogen-activated protein kinases. PD98059, an inhibitor of these kinases, inhibited this proliferative response. Both tryptase and SLIGRL increased collagen secretion by stellate cells. CONCLUSIONS:This study indicates that the natural proteinase-activated receptor agonists thrombin and MC tryptase might sustain liver fibrosis by promoting stellate cell proliferation and collagen synthesis.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Gaça MD,Zhou X,Benyon RC

doi

10.1016/s0168-8278(01)00285-9

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

362-9

issue

3

eissn

0168-8278

issn

1600-0641

pii

S0168827801002859

journal_volume

36

pub_type

杂志文章

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