Preventive effect of 7,8-dihydroxyflavone against oxidative stress induced genotoxicity.

Abstract:

:We elucidated the protective effect of 7,8-dihydroxyflavone against hydrogen peroxide (H(2)O(2))-induced DNA damage. We found that 7,8-dihydroxyflavone scavenges 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and intracellular reactive oxygen species (ROS). 7,8-Dihydroxyflavone with antioxidant effect prevented the H(2)O(2)-induced cellular DNA damage, as evidenced by comet tail, 8-hydroxy-2'-deoxyguanosine (8-OHdG) content, and phospho-histone H2A.X protein expression. Hence, 7,8-dihydroxyflavone was shown to protect cell via the inhibition of apoptosis induced by H(2)O(2). This was substantiated by decreased apoptotic nuclear fragmentation, decreased sub-G(1) cell population, and decreased DNA fragmentation. Furthermore, 7,8-dihydroxyflavone activated the protein kinase B (PKB, Akt) signal pathway, which is a major survival signal pathway. In addition, LY294002, which is phosphatidylinositol 3 kinase (PI3K, upstream of Akt) inhibitor, attenuated the protective effect of 7,8-dihydroxyflavone against H(2)O(2)-induced cell damage. In conclusion, 7,8-dihydroxyflavone was shown to possess cytoprotective properties against oxidative stress by scavenging intracellular ROS and enhancing Akt activity.

journal_name

Biol Pharm Bull

authors

Zhang R,Kang KA,Piao MJ,Ko DO,Wang ZH,Chang WY,You HJ,Lee IK,Kim BJ,Kang SS,Hyun JW

doi

10.1248/bpb.32.166

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

166-71

issue

2

eissn

0918-6158

issn

1347-5215

pii

JST.JSTAGE/bpb/32.166

journal_volume

32

pub_type

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