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标题：Involvement of p53 and Nuclear Factor-kappaB Signaling Pathway for the Induction of G1-Phase Cell Cycle Arrest of Cholangiocarcinoma Cell Lines by Isomorellin
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作者：Chariya Hahnvajanawong ; Supaluk Ketnimit ; Kovit Pattanapanyasat 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2012
卷号：35
期号：11
页码：1914-1925
DOI：10.1248/bpb.b12-00118
出版社：The Pharmaceutical Society of Japan
摘要：Cell cycle arrest is closely linked to apoptosis. Isomorellin—a caged xanthone isolated from Garcinia hanburyi —induced apoptosis in cholangiocarcinoma (CCA) cell lines. To elucidate potential anticancer mechanisms, we investigated the effects of isomorellin on the growth, cell cycle progression, cell cycle regulated protein expression and nuclear factor-kappa B (NF-κB) activation of KKU-100 and KKU-M156 CCA cell lines; using sulforhodamine B assay, flow cytometry and Western blot analysis. The growth of both CCA cell lines was significantly inhibited by isomorellin treatment in a time- and dose-dependent manner. The respective IC₅₀ value of isomorellin for KKU-100 cells was 6.2±0.13, 5.1±0.11 and 3.5±0.25 µ M at 24, 48 and 72 h. By comparison, the respective IC₅₀ value for KKU-M156 cells was 1.9±0.22, 1.7±0.14 and 1.5±0.14 µ M at 24, 48 and 72 h. The growth inhibition of CCA cells by isomorellin was through the G0/G1 phase arrest mediated by inhibition of NF-κB activation, up-regulation of p53, p21 and p27 and down-regulation of cyclin D1, cyclin E, Cdk4 and Cdk2 protein levels. Our research suggests that isomorellin induces cell cycle arrest and apoptosis in CCA cell lines through p53 and the NF-κB-signaling pathway. The growth inhibitory potential of isomorellin was comparable to that of gambogic acid. Isomorellin shows potential as a therapeutic agent against human cholangiocarcinoma.
关键词：isomorellin;cell cycle arrest;cholangiocarcinoma;Garcinia hanburyi;nuclear factor-kappa B;p53