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Modulation of Nrf2-mediated antioxidant and detoxifying enzyme induction by the green tea polyphenol EGCG
Hye-Kyung Na1, Young-Joon Surh
1National Research Laboratory of Molecular Carcinogenesis and Chemoprevention, College of Pharmacy, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-742, South Korea.
Abstract:
Frequent consumption of green tea, one of the most popular and widely consumed beverages, has been known to protect against development of various cancers according to numerous experimental and several population-based studies. Molecular mechanisms underlying chemopreventive effects exerted by green tea and its components have been extensively investigated. (-)-Epigallocatechin-3-gallate (EGCG), a major green tea polyphenol, has been shown to induce expression of glutathione S-transferase, glutathione peroxidase, glutamate cysteine ligase, hemeoxygenase-1, etc. that are involved in the elimination or inactivation of reactive oxygen species and electrophiles implicated in multi-stage carcinogenesis. The redox-sensitive transcription factor, nuclear factor erythroid 2 p45 (NF-E2)-related factor (Nrf2) plays a key role in regulating induction of phase II detoxifying or antioxidant enzymes. Thus, activation of Nrf2 is considered to be an important molecular target of many chemopreventive and chemoprotective agents. This review summarizes the molecular basis of chemoprevention and cytoprotection afforded by EGCG with emphasis on its ability to modulate Nrf2-mediated cellular events.
Insights
Green tea
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Green tea consumption is linked to cancer prevention.
- Its components, like EGCG, activate protective enzymes.
- Carcinogenesis involves reactive oxygen species and electrophiles.
Purpose of the Study:
- To review the chemopreventive and cytoprotective mechanisms of EGCG.
- To highlight EGCG's role in modulating Nrf2-mediated cellular events.
- To understand the molecular basis of green tea's cancer-protective effects.
Main Methods:
- Literature review of experimental and population-based studies.
- Focus on molecular mechanisms of EGCG action.
- Emphasis on Nrf2 pathway activation.
Main Results:
- EGCG induces phase II detoxifying and antioxidant enzymes.
- These enzymes (GST, GPx, GCL, HO-1) neutralize harmful agents.
- EGCG activates the Nrf2 transcription factor.
Conclusions:
- EGCG's chemopreventive effects are mediated by Nrf2 activation.
- Nrf2-dependent induction of antioxidant enzymes is key.
- EGCG represents a potential therapeutic agent for cancer prevention.
