Honokiol inhibits HIF pathway and hypoxia-induced expression of histone lysine demethylases.

Abstract:

:Hypoxia-inducible-factor (HIF)-mediated expression of pro-angiogenic genes under hypoxic conditions is the fundamental cause of pathological neovascularization in retinal ischemic diseases and cancers. Recent studies have shown that histone lysine demethylases (KDMs) play a key role in the amplification of HIF signaling and expression of pro-angiogenic genes. Thus, the inhibitors of the HIF pathway or KDMs can have profound therapeutic value for diseases caused by pathological neovascularization. Here, we show that hypoxia-mediated expression of KDMs is a conserved process across multiple cell lines. Moreover, we report that honokiol, a biphenolic phytochemical extracted from Magnolia genus which has been used for thousands of years in the traditional Japanese and Chinese medicine, is a potent inhibitor of the HIF pathway as well as hypoxia-induced expression of KDMs in a number of cancer and retinal pigment epithelial cell lines. Further, treating the cells with honokiol leads to inhibition of KDM-mediated induction of pro-angiogenic genes (adrenomedullin and growth differentiation factor 15) under hypoxic conditions. Our results provide an evidence-based scientific explanation for therapeutic benefits observed with honokiol and warrant its further clinical evaluation for the treatment of pathological neovascularization in retinal ischemic diseases and cancers.

authors

Vavilala DT,Ponnaluri VK,Vadlapatla RK,Pal D,Mitra AK,Mukherji M

doi

10.1016/j.bbrc.2012.04.143

subject

Has Abstract

pub_date

2012-06-08 00:00:00

pages

369-74

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(12)00832-7

journal_volume

422

pub_type

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