HPA (96017-59-3) is a histone deacetylase (HDAC) inhibitor, IC50=13 μM1. More potent and robust than valproic acid at inducing histone hyperacetylation (600% at 50 μM), HSP70 induction and protection against glutamate excitotoxicity in cultured neurons2. Cell permeable.
1) Eikel et al. (2006), Teratogenic effects mediated by inhibition of histone deacetylases: evidence from quantitative structure activity relationships of 20 valproic acid derivatives; Chem. Res. Toxicol., 19 272
2) Leng et al. (2010), Potent neuroprotective effects of novel structural derivatives of valproic acid: potential roles of HDAC inhibition and HSP70 induction; Neurosci. Lett., 476 127