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Biochem Biophys Res Commun. 2009 Jan 16;378(3):326-31. doi: 10.1016/j.bbrc.2008.11.057. Epub 2008 Nov 25.

An HDAC inhibitor, trichostatin A, induces a delay at G2/M transition, slippage of spindle checkpoint, and cell death in a transcription-dependent manner.

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Department of Molecular Science and Technology, College of Natural Sciences, Ajou University, Suwon 443-749, Daejeon 305-701, Republic of Korea.


Histone deacetylases (HDACs), a promising target for cancer therapy, play a role in regulating cell-cycle progression. The mechanisms for HDAC inhibition-induced regulation of G(2)/M transition and mitotic progression remain to be elucidated. Herein, we report that trichostatin A (TSA), an HDAC inhibitor, induces a delay at the G(2)/M transition, chromosome missegregation and multi-nucleation, and thereby leads to cell death by promoting exit from aberrant mitosis without spindle checkpoint. These results are associated with a transcriptional modulation of key regulator genes of the cell cycle, including CyclinB1, Plk1, Survivin, and p21(WAF1/Cip1). Actinomycin D, a transcriptional inhibitor, abrogated the TSA-induced delay of G(2)/M transition and transcriptional modulation of cell-cycle regulator genes, indicating that the impact of TSA in this manner is transcription dependent. Overall, our findings indicate that TSA provides a barrier to cell-cycle progression for antiproliferation and promotes escape from mitotic catastrophe and cell death, by inhibiting an HDAC-mediated transcriptional action.

[Indexed for MEDLINE]

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