Inhibition of transforming growth factor-beta-induced liver fibrosis by a retinoic acid derivative via the suppression of Col 1A2 promoter activity - PubMed (original) (raw)
. 2008 Aug 22;373(2):219-23.
doi: 10.1016/j.bbrc.2008.05.192. Epub 2008 Jun 17.
Affiliations
- PMID: 18558083
- DOI: 10.1016/j.bbrc.2008.05.192
Inhibition of transforming growth factor-beta-induced liver fibrosis by a retinoic acid derivative via the suppression of Col 1A2 promoter activity
Kun-Lin Yang et al. Biochem Biophys Res Commun. 2008.
Abstract
Transforming growth factor-beta1 (TGF-beta1) mediates expression of collagen 1A2 (Col 1A2) gene via a synergistic cooperation between Smad2/Smad3 and Sp1, both act on the Col 1A2 gene promoter. In our previous study, we reported that a retinoic acid derivative obtained from Phellinus linteus (designated PL) antagonizes TGF-beta-induced liver fibrosis through regulation of ROS and calcium influx. In this continuing study we seek further the effect of PL on the Smad signaling pathway. We used a Col 1A2 promoter-luciferase construct to study the action of PL on Smad through TGF-beta. We found that PL decreases the promoter activity of Col 1A2, hinders the translocalization of phosphorylated Smad2/3-Smad 4 complex from cytosol into nucleus and inhibits Sp1 binding activity. These results suggest that PL inhibits TGF-beta1-induced Col 1A2 promoter activity through blocking ROS and calcium influx as well as impeding Sp1 binding and translocalization of pSmad 2/3-Smad4 complex into nucleus.
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