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

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.
Mesh Terms:
Antineoplastic Agents, Biphenyl Compounds, Cell Death, Cell Line, Tumor, Enzyme Inhibitors, HSP70 Heat-Shock Proteins, HSP90 Heat-Shock Proteins, Histone Deacetylase Inhibitors, Histone Deacetylases, Humans, Hydroxamic Acids, Protein-Serine-Threonine Kinases, Pyrrolidines, Stomach Neoplasms
J. Mol. Med.
Date: Jan. 01, 2008
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