Article Publish Status: FREE
Abstract Title:

Anti-Cancer Effects of Green Tea by Either Anti- or Pro- Oxidative Mechanisms.

Abstract Source:

Asian Pac J Cancer Prev. 2016 ;17(4):1649-54. PMID: 27221834

Abstract Author(s):

Sumio Hayakawa, Kieko Saito, Noriyuki Miyoshi, Tomokazu Ohishi, Yumiko Oishi, Mamoru Miyoshi, Yoriyuki Nakamura

Article Affiliation:

Sumio Hayakawa

Abstract:

Tea derived from the leaves and buds of Camellia sinensis (Theaceae) is consumed worldwide. Green tea contains various components with specific health-promoting effects, and is believed to exert protective effects against diseases including cancer, diabetes and hepatitis, as well as obesity. Of the various tea components, the polyphenol catechins have been the subject of extensive investigation and among the catechins, (-)-epigallocatechin gallate has the strongest bioactivity in most cases. Our research group has postulated that hepatocyte nuclear factor-4α, sterol regulatory element-binding proteins, and tumor necrosis factor-α are targets of green tea constituents including (-)-epigallocatechin gallate for their anti-diabetes, anti-obesity, and anti-hepatitis effects, respectively. Published papers were reviewed to determine whether the observedchanges in these factors can be correlated with anti-cancer effects of green tea. Two major action mechanisms of (-)-epigallocatechin gallate have been proposed; one associated with its anti-oxidative properties and the other with its pro-oxidative activity. When reactive oxygen species are assumedto be involved, our findings that (-)-epigallocatechin gallate down- regulated hepatocyte nuclear factor-4α, sterol regulatory element-binding proteins, and tumor necrosis factor-α may explain the anti-cancer effect of green tea as well. However, further studies are required to elucidate which determinant directs (-)-epigallocatechin gallate action as an anti-oxidant or a pro-oxidant for favorable activity.

Study Type : Review
Additional Links
Pharmacological Actions : Apoptotic : CK(5217) : AC(3846)
Additional Keywords : Fibronectin : CK(26) : AC(7)

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