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- W2118881723 abstract "During liver injury, hepatic stellate cells (HSC) acquire a myofibroblast-like phenotype associated with reduction of lipid droplets, increased collagen synthesis, and proliferation. Peroxisome proliferator-activated receptor gamma (PPARgamma) regulates adipocyte differentiation and controls gene transcription in response to various activators including prostanoids and antidiabetic thiazolidinediones. We explored whether the presence of PPARgamma and its transcriptional activity were involved in control of HSC proliferation in vitro. PPARgamma ligands, 15-deoxy-triangle up(1214) prostaglandin J(2) (15d-PGJ(2)) and ciglitizone, significantly decrease platelet-derived growth factor (PDGF)-induced proliferation in activated human HSC and inhibit alpha smooth muscle actin (alpha-SMA) expression during HSC transdifferentiation. Treatment with 9-cis retinoic acid (9-cisRA) and LG268, ligands of the heterodimerization partner retinoic X receptor (RXR), had a negligible effect in PDGF-treated cells but caused a further reduction of proliferation when used in combination with ciglitizone. Transfection experiments with a reporter gene consisting of 3 copies of a PPAR response element (peroxisome proliferator response element [PPRE](3)-tk-luciferase) showed a progressive reduction of PPAR transcriptional activity during plastic-induced HSC transdifferentiation. Cotransfection with human PPARgamma expression vector restored the PPRE(3)-tk-luciferase reporter expression and the increased level of the receptor in activated HSC-inhibited cell proliferation in a dose-dependent manner. Incubation of human PPARgamma-cotransfected HSC with PDGF strongly inhibited luciferase activity and this effect was blocked by the inhibition of the mitogen-activated protein (MAP) kinase signal cascade. Our results indicate that depression of PPARgamma expression and activity is involved in HSC proliferation and that the PPARgamma ligand-mediated activation exerts a previously unrecognized inhibition of PDGF-induced mitogenesis in activated human HSC." @default.
- W2118881723 created "2016-06-24" @default.
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- W2118881723 date "2000-01-01" @default.
- W2118881723 modified "2023-10-14" @default.
- W2118881723 title "Peroxisome proliferator-activated receptor ? transcriptional regulation is involved in platelet-derived growth factor-induced proliferation of human hepatic stellate cells" @default.
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- W2118881723 doi "https://doi.org/10.1002/hep.510310117" @default.
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