The Mechanism of the Anti-Tumor Activity of the Histone Deacetylase Inhibitor, Suberoylanilide Hydroxamic Acid (SAHA)

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Abstract
Histone deacetylases (HDAC) are ubiquitously distributed through chromatin. Nevertheless HDAC inhibitors (HDACi), such as SAHA, selectively alter the transcription of as few as 2–5% of expressed genes in various transformed cells. p21WAF1 is one of the most commonly induced genes in cells cultured with SAHA. Understanding the mechanism of the selective effects of the HDACi is a challenging problem. Gui et al. have identified effects of SAHA on p21WAF1 promotor associated proteins that explain, at least in part, the selective effects of HDAC in altering gene expression (see ref. 1).

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