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Effects of trichostatin A, a histone deacetylase inhibitor, on the regulation of apoptosis in H-ras-transformed breast epithelial cells

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This study examined the mechanism for the anti-cancer effects of histone deacetylase (HDAC) inhibitor trichostatin A (TsA) in H-ras-transformed human breast epithelial (MCF10A-ras) cells. The effects of TsA on anti-cancer effects of MCF10A-ras cells were determined by measuring the level of cell cycle regulator expression and apoptotic cell death using Western blotting and flow cytometry analysis, respectively. TsA induced morphological changes, apoptotic cell death and modulation of the cell cycle regulatory proteins in the MCF10A-ras cells. TsA increased the levels of acetylated histone H3 and H4 in MCF10A-ras cells. In addition, TsA markedly down-regulated the expression of cyclin D1 and CDK4, up-regulated the expression of p21WAF1 and p53 and induced cell cycle arrest at the G1 phase in MCF10A-ras cells. The levels of hyperphosphorylation of the Rb protein were lower in MCF10A-ras cells after the TsA treatment. Furthermore, the up-regulation of p53 promoted Bax expression, which led to the activation of pro-caspase-3 and eventually to apoptosis in MCF10A-ras cells. TsA significantly increased the levels of ERK1/2 phosphorylation in MCF10A-ras cells. Overall, the TsA-activated ERK pathway plays an important role in cell cycle arrest and apoptosis through the ERK-dependent induction of p21 in Ras-related human cancer cells.
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Document Type: Research Article

Affiliations: College of Pharmacy, Pusan National University, San 30, Geumjeung-gu, Busan 609-735, Korea

Publication date: November 1, 2008

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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