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MDM2 antagonist can inhibit tumor growth in hepatocellular carcinoma with different types of p53 in vitro
Author(s) -
Wang Jiabei,
Zheng Tongsen,
Chen Xi,
Song Xuan,
Meng Xianzhi,
Bhatta Nishant,
Pan Shangha,
Jiang Hongchi,
Liu Lianxin
Publication year - 2011
Publication title -
journal of gastroenterology and hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 130
eISSN - 1440-1746
pISSN - 0815-9319
DOI - 10.1111/j.1440-1746.2010.06440.x
Subject(s) - apoptosis , cancer research , mdm2 , cell growth , cell cycle , hepatocellular carcinoma , cell culture , viability assay , cell cycle checkpoint , western blot , medicine , biology , biochemistry , genetics , gene
Background and Aims: Nutlin‐3, a selective small‐molecule inhibitor of the p53‐MDM2 interaction, has been shown to have antitumor activities in various tumors with wild‐type p53. However, its effect on hepatocellular carcinoma (HCC) with different types of p53 remains unclear. This study is designed to determine nutlin‐3′s antitumor efficacy and underlying mechanisms of action in human HCC cells. Methods: Cell viability assay, cell cycle analysis, apoptosis assay, western blot, co‐ immunoprecipitation and siRNA experiments were analyzed in three human HCC cells. Anti‐tumoral effects of nutlin‐3 targeting the p53 and p73 pathways were evaluated in HCC cell lines. Results: Nutlin‐3 exerted the greatest anti‐tumoral effect to three human HCC cells with wild‐type p53, mutant p53 and p53‐null. Nutlin‐3 not only upregulated p53 in HepG2 cells, but also p73 in Huh7 and Hep3B cells, and disrupted p53‐MDM2 and p73‐MDM2 complexes in HCC cells. The compound inhibited cell proliferation, induced G0/G1 phase arrest, decreased the levels of CyclinD1, CyclinE, CDK2, CDK4, PCNA and E2F‐1, and increased the levels of p21 and p27. It also induced apoptosis, increased the Bax/Bcl‐2 ratio, then activated caspase‐9 and caspase‐3. Conclusions: Nutlin‐3 has significant anticancer effects against human HCC cells, regardless of p53 status, indicating that it is a promising therapy for human hepatocellular carcinoma.