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- W1976962732 abstract "The activation of peroxisome proliferator-activated receptor gamma (PPARgamma) has been shown to induce growth arrest and differentiation of various cancer cells. In the current study, we investigated the effect of 12-O-tetradecanoylphorbol-13-acetate (TPA) on the expression of PPARgamma and proliferation of A549 cells. TPA elicited a dose- and time-dependent increase in PPARgamma mRNA and protein levels. PPARgamma expression in response to TPA was attenuated by pretreatment with bisindolylmaleimide I, N-acetyl-L-cysteine (NAC) and PD98059. TPA-induced protein kinase C (PKC) activation was linked to the generation of reactive oxygen species (ROS), both of which were indispensable for PPARgamma expression in A549 cells. Pretreatment with bisindolylmaleimide I or NAC blocked TPA-induced phosphorylation of extracellular signal-regulated kinase (ERK), suggesting that ERK-mediated signaling is also involved in the induction of PPARgamma. Furthermore, the growth inhibitory effect of troglitazone was significantly potentiated by prolonged incubation with TPA and was attenuated in the presence of GW9662, a specific inhibitor of PPARgamma. These effects were associated with an induction of cell cycle arrest at G0/G1 phase, which was accompanied by the induction of p21Waf1/Cip1 expression and decreased cyclin D1 expression. Taken together, these observations indicate that TPA synergizes with PPARgamma ligand to inhibit cell growth through up-regulation of PPARgamma expression." @default.
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- W1976962732 date "2006-10-01" @default.
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- W1976962732 title "Phorbol ester potentiates the growth inhibitory effects of troglitazone via up-regulation of PPARγ in A549 cells" @default.
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- W1976962732 doi "https://doi.org/10.1016/j.bbrc.2006.08.085" @default.
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