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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
p38 MAPK mediates the regulation of alpha1(I) procollagen mRNA levels by TNF-alpha and TGF-beta in a cell line of rat hepatic stellate cells(1).
FEBS Letters 2002 September 26
The role of members of the mitogen-activated protein kinase (MAPK) family on tumor necrosis factor alpha (TNF-alpha)-mediated down-regulation of col1a1 gene was studied. TNF-alpha increased extracellular-regulated kinase and Jun-N-terminal kinase phosphorylation, but these effects were not related to its inhibitory effect on alpha1(I) procollagen (col1a1) mRNA levels. Phosphorylation of p38 MAPK was decreased in response to TNF-alpha, and the specific p38 MAPK inhibitor SB203580 mimicked the effect of TNF-alpha on col1a1 mRNA levels. Transforming growth factor beta (TGF-beta) increased p38 MAPK phosphorylation and SB203580 prevented the induction of col1a1 mRNA levels by TGF-beta. These results suggest that p38 MAPK plays an important role in regulating the expression of col1a1 in hepatic stellate cells in response to cytokines.
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