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. 2008 Jan;86(1):117-28.
doi: 10.1007/s00109-007-0260-8. Epub 2007 Sep 13.

Inhibitors of histone deacetylases induce tumor-selective cytotoxicity through modulating Aurora-A kinase

Jung-Hyun Park  1 , Hyun-Soon Jong, Sang Gyun Kim, Yeonjoo Jung, Keun-Wook Lee, Ju-Hee Lee, Dae-Kee Kim, Yung-Jue Bang, Tae-You Kim
Affiliations

Inhibitors of histone deacetylases induce tumor-selective cytotoxicity through modulating Aurora-A kinase

Jung-Hyun Park et al. J Mol Med (Berl). 2008 Jan.

Abstract

The molecular basis of the antitumor selectivity of histone deacetylase inhibitors (HDIs) remains unclear. Centrosomal Aurora-A kinase regulates chromosomal segregation during mitosis. The overexpression or amplification of Aurora-A leads to genetic instability, and its inhibition has shown significant antitumor effects. In this paper, we report that structurally related hydroxamate LAQ824 and SK-7068 induce tumor-selective mitotic defects by depleting Aurora-A. We found that HDI-treated cancer cells, unlike nontransformed cells, exhibit defective mitotic spindles. After HDI, Aurora-A was selectively downregulated in cancer cells, whereas Aurora-B remained unchanged in both cancer and nontransformed cells. LAQ824 or SK-7068 treatment inhibited histone deacetylase (HDAC) 6 present in Aurora-A/heat shock protein (Hsp) 90 complex. Inhibition of HDAC6 acetylated Hsp90 and resulted in dissociation of acetylated Hsp90 from Aurora-A. As a result, Hsp70 binding to Aurora-A was enhanced in cancer cells, leading to proteasomal degradation of Aurora-A. Overall, these provide a novel molecular basis of tumor selectivity of HDI. LAQ824 and SK-7068 might be more effective HDIs in cancer cells with Aurora-A overexpression.

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