NCIt definition : An orally bioavailable, second-generation, hydroxamic acid-based inhibitor of histone
deacetylase (HDAC) with potential antineoplastic activity. HDAC inhibitor JNJ-26481585
inhibits HDAC leading to an accumulation of highly acetylated histones, which may
result in an induction of chromatin remodeling; inhibition of the transcription of
tumor suppressor genes; inhibition of tumor cell division; and the induction of tumor
cell apoptosis. HDAC, an enzyme upregulated in many tumor types, deacetylates chromatin
histone proteins. Compared to some first generation HDAC inhibitors, JNJ-26481585
may induce superior HSP70 upregulation and bcl-2 downregulation.;