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Eur J Pharmacol. 2013 Jan 15;699(1-3):124-31. doi: 10.1016/j.ejphar.2012.12.008. Epub 2012 Dec 19.

Piceatannol, a hydroxystilbene natural product, stabilizes HIF-1α protein by inhibiting HIF prolyl hydroxylase.

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  • 1College of Pharmacy, Pusan National University, Busan 609-735, Republic of Korea.

Abstract

To investigate the mechanisms underlying the biological activity of piceatannol (PCT), a hydroxystilbene natural product that has anti-colitic properties, we examined whether PCT could modulate hypoxia-inducible factor (HIF)-1 activity in human colon carcinoma cells. PCT induced HIF-1α protein, leading to induction of its target gene products, vascular endothelial growth factor and heme oxygenase-1, which are involved in amelioration of colitis. PCT induction of HIF-1α resulted from HIF-1α protein stabilization, which occurred through inhibition of HIF-prolyl hydroxylase-2 (HPH-2). PCT inhibition of HPH-2 was reversed by addition of ascorbate, a cofactor of HPH-2, but not the cosubstrate, 2-ketoglutarate, to the reaction mixture of an in vitro von Hippel-Lindau (VHL) capture assay, and pretreatment with ascorbate abrogated PCT induction of cellular HIF-1α. Moreover, PCT prevented hydroxylation of cellular HIF-1α and attenuated coimmunoprecipitation of Flag-VHL protein and HA-HIF-1α over-expressed in human embryonic kidney 293 cells. Structural analysis using derivatives of PCT revealed that the catechol moiety in PCT was required for the stabilization of HIF-1α protein. Taken together, PCT activation of HIF-1 resulting from inhibition of HPH-2 may be a molecular mechanism for an anti-colitic effect of the natural product.

Copyright © 2012 Elsevier B.V. All rights reserved.

PMID:
23261967
[PubMed - indexed for MEDLINE]
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