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Mol Carcinog. 2007 Jun;46(6):436-45.

Structure-activity relationship of flavonoids for inhibition of epidermal growth factor-induced transformation of JB6 Cl 41 cells.

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Department of Hospital Pharmacy, School of Medicine, Kanazawa University, Kanazawa, Japan.


We found that quercetin, myricetin, quercetagetin, fisetin, (-)-epigallocatechin gallate (EGCG), and theaflavins, among 24 flavonoids examined, markedly inhibited epidermal growth factor (EGF)-induced cell transformation of mouse epidermal JB6 Cl 41 cells. The six flavonoids suppressed the EGF-induced activation of activator protein 1 (AP-1). In addition, myricetin, quercetagetin, EGCG, and theaflavins directly inhibited EGF-induced phosphatidylinositol 3-kinase (PI3K) activation. The important structural features of flavonoids for cell transformation-inhibitory activity are 3'- and 4'-OH on the B-ring, 3-OH on the C-ring, C2=C3 double bond in the C-ring, and the phenylchromone (C6-C5-C6) skeleton in the flavonols, and the galloyl group in EGCG and theaflavins. Our results provide new insight into possible mechanisms of the anti-carcinogenic effects of flavonoids, and could help to provide a basis for the design of novel cancer chemopreventive agents.

[Indexed for MEDLINE]

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