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Article Publish Status: FREE
Abstract Title:

Myricetin suppresses UVB-induced skin cancer by targeting Fyn.

Abstract Source:

Cancer Res. 2008 Jul 15 ;68(14):6021-9. PMID: 18632659

Abstract Author(s):

Sung Keun Jung, Ki Won Lee, Sanguine Byun, Nam Joo Kang, Sung Hwan Lim, Yong-Seok Heo, Ann M Bode, G Tim Bowden, Hyong Joo Lee, Zigang Dong

Article Affiliation:

Sung Keun Jung

Abstract:

Skin cancer is currently the most common type of human cancer in Americans. Myricetin, a naturally occurring phytochemical, has potent anticancer-promoting activity and contributes to the chemopreventive potential of several foods, including red wine. Here, we show that myricetin suppresses UVB-induced cyclooxygenase-2 (COX-2) expression in mouse skin epidermal JB6 P+ cells. The activation of activator protein-1 and nuclear factor-kappaB induced by UVB was dose-dependently inhibited by myricetin treatment. Western blot and kinase assay data revealed that myricetin inhibited Fyn kinase activity and subsequently attenuated UVB-induced phosphorylation of mitogen-activated protein kinases. Pull-down assays revealed that myricetin competitively bound with ATP to suppress Fyn kinase activity. Importantly, myricetin exerted similar inhibitory effects compared with 4-amino-5-(4-chloro-phenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine, a well-known pharmacologic inhibitor of Fyn. In vivo mouse skin data also revealed that myricetin inhibited Fyn kinase activity directly and subsequently attenuated UVB-induced COX-2 expression. Mouse skin tumorigenesis data clearly showed that pretreatment with myricetin significantly suppressed UVB-induced skin tumor incidence in a dose-dependent manner. Docking data suggest that myricetin is easily docked to the ATP-binding site of Fyn, which is located between the N and C lobes of the kinase domain. Overall, these results indicated that myricetin exerts potent chemopreventive activity mainly by targeting Fyn in skin carcinogenesis.

Study Type : In Vitro Study

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Sayer Ji
Founder of GreenMedInfo.com

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