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Septin4_i1 Regulates Apoptosis in Hepatic Stellate Cells through Peroxisome Proliferator-Activated Receptor-?/Akt/B-Cell Lymphoma 2 Pathway #MMPMID25527525
Zhu D; Wang J; Sun X; Chen J; Duan Y; Pan J; Xu T; Qin Y; He X; Huang C
J Histochem Cytochem 2015[Mar]; 63 (3): 163-9 PMID25527525show ga
Apoptosis of activated hepatic stellate cells (HSCs) has been verified as a potential mechanism to aid in hepatic fibrosis remission. Earlier research suggests that Septin4_i1 may sensitize hepatocellular carcinoma cells to serum starvation-induced apoptosis. Here, we aimed to investigate the effect of Septin4_i1 on HSC apoptosis and explore the associated signaling pathways. We found that Septin4_i1 can induce apoptosis in LX-2 cells and that this is accompanied by an up-regulation in cleaved-caspase-3 and peroxisome proliferator-activated receptor-? (PPAR-?) expression and a down-regulation in ?-SMA expression. Over-expression of Septin4_i1 reduced phosphorylated Akt and B-cell lymphoma 2 (Bcl-2) expression but had no effect on the expression of p53 and death receptor (DR)-5. The decreased expression of Bcl-2 and the increased expression of cleaved-caspase-3 induced by Sept4_i1 could be reversed by GW501516, a PPAR-?/? agonist that has been reported by others to enhance Akt signaling. In addition, GW9662, an antagonist of PPAR-?, could also inhibit apoptosis in LX-2 cells induced by Sept4_i1. In conclusion, our data suggest that Sept4_i1 induces HSC apoptosis by inhibiting Akt and Bcl-2 expression and up-regulating PPAR-? expression.