Cited by 804Tea Polyphenols and EffectsPhytochemicals and Antioxidant ActivitiesGenomics, phytochemicals, and oxidative stress

New insights into the mechanisms of polyphenols beyond antioxidant properties; lessons from the green tea polyphenol, epigallocatechin 3-gallate

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Kim, Hae-Suk, Quon, Michael J., Kim, Jeong-a·2014·Redox Biology

Abstract

Green tea is rich in polyphenol flavonoids including catechins. Epigallocatechin 3-gallate (EGCG) is the most abundant and potent green tea catechin. EGCG has been extensively studied for its beneficial health effects as a nutriceutical agent. Based upon its chemical structure, EGCG is often classified as an antioxidant. However, treatment of cells with EGCG results in production of hydrogen peroxide and hydroxyl radicals in the presence of Fe (III). Thus, EGCG functions as a pro-oxidant in some cellular contexts. Recent investigations have revealed many other direct actions of EGCG that are independent from anti-oxidative mechanisms. In this review, we discuss these novel molecular mechanisms of action for EGCG. In particular, EGCG directly interacts with proteins and phospholipids in the plasma membrane and regulates signal transduction pathways, transcription factors, DNA methylation, mitochondrial function, and autophagy to exert many of its beneficial biological actions.

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Crossref · 10.1016/j.redox.2013.12.022

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  • EGCG acts as an antioxidant at nM concentrations and as a prooxidant at μM concentrations.

    “Attention should be paid to the local EGCG concentration as, when tested in nM concentrations, it acts as antioxidant, whereas when tested in the μM concentration range, EGCG acts as a prooxidant [96].”

    From Antioxidants from Plants Protect against Skin Photoaging (2018) · cites this paper as [96]

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Authors
Kim, H.-S., Quon, M. J., & Kim, J.-A.
Affiliations
  • University of Alabama at Birmingham (US)
  • University of Maryland, Baltimore (US)
Corresponding author
Kim, Jeong-a
Venue
Redox Biology
Publisher
Elsevier BV
Published
2014
Volume
2
Pages
187-195
ISSN
2213-2317 (ISSN-L)
OpenAlex
W2056538157
Cited by
804
References
126
Citations by year
2026: 48 · 2025: 64 · 2024: 66 · 2023: 63 · 2022: 70 · 2021: 75 · 2020: 73 · 2019: 66 · 2018: 83 · 2017: 59 · 2016: 60 · 2015: 57 · 2014: 20
FWCI
9.10
Type
journal article
Language
en
Open access
Locations
  • Redox Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • American Diabetes Association (1-09-JF-33, 1-12-BS-99, 1-13-BS-150)
  • American Heart Association (13GRNT17220057)
  • National Institutes of Health (P60 DK-079626)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Tea Polyphenols and Effects
  • Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
Keywords
epigallocatechin gallate, green tea catechins, polyphenols, pro-oxidant activity, protein-lipid interactions, plasma membrane, signal transduction, transcription factors, DNA methylation, mitochondrial function, autophagy
MeSH terms
Cyclic AMP, Animals, Antioxidants, Autophagy, Catechin, Cell Membrane, Gene Expression Regulation, Cyclic GMP, Humans, Hydrogen Peroxide, Mitochondria, Oxidation-Reduction, Tea, Transcription Factors, Transcription, Genetic, Signal Transduction, Oxidants, DNA Methylation, Calcium Signaling, Polyphenols

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