Cited by 133Skin Protection and AgingTea Polyphenols and EffectsPhytochemicals and Antioxidant Activities

Prevention of photocarcinogenesis by topical administration of pure epigallocatechin gallate isolated from green tea

Gensler, Helen L., Timmermann, Barbara N., Valcic, Susanne, Wächter, Gerald A., Dorr, Robert, Dvorakova, Katerina, Alberts, David S.·1996·Nutrition and Cancer

Abstract

Topical application of purified (-)-epigallocatechin-3-gallate (EGCG), a polyphenolic antioxidant isolated from green tea, inhibited photocarcinogenesis in BALB/cAnNHsd mice with no visible toxicity. Mice were treated with 0, 10, or 50 mg of EGCG in 200 microliters of acetone three times weekly for three weeks before ultraviolet (UV) treatments began and throughout the experiment. UV radiation consisted of five 30-minute exposures per week to banks of six FS40 Westinghouse sunlamps for 25 weeks. In the photocarcinogenesis study, mice received a total dose of approximately 2.1 x 10(6) J/m2. Skin cancer incidence in UV-irradiated mice was 96% at 28 weeks after the first UV treatment; EGCG at 10 or 50 mg reduced this incidence to 62% and 29%, respectively. UV-induced immunosuppression, assessed by the inability of UVB-irradiated mice to reject a syngeneic antigenic tumor, was not influenced by topical EGCG. Oral administration of 0, 100, or 500 mg of pure EGCG per liter of drinking water (approximately 0, 0.56, or 2.8 mg/day, respectively) did not decrease UV-induced skin tumor incidence, rate of primary tumor growth, or inability to reject antigenic tumors. Thus induction of skin tumors by UV radiation was significantly reduced by topical, but not by oral, administration of purified EGCG through a mechanism distinct from inhibition of photoimmunosuppression.

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Crossref · 10.1080/01635589609514488

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Authors
Gensler, H. L., Timmermann, B. N., Valcic, S., Wächter, G. A., Dorr, R., Dvorakova, K., & Alberts, D. S.
Affiliations
University of Arizona (US)
Venue
Nutrition and Cancer
Published
1996-01
Volume
26
Issue
3
Pages
325-335
ISSN
  • 0163-5581 (ISSN-L)
  • 1532-7914
OpenAlex
W1967936513
Cited by
133
References
47
Citations by year
2025: 2 · 2024: 2 · 2023: 1 · 2022: 5 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 2 · 2013: 4 · 2012: 2
FWCI
8.41
Type
journal article
Language
en
Open access
closed
Locations
  • Nutrition and Cancer (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA-44502, CA 27502, P01CA027502)
Topics
  • Health Sciences › Medicine › Dermatology › Skin Protection and Aging
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Tea Polyphenols and Effects
  • Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
Keywords
epigallocatechin gallate, green tea polyphenols, photocarcinogenesis, UV-induced skin cancer, topical administration, oral administration, ultraviolet radiation, photoimmunosuppression, cancer prevention, antioxidants
MeSH terms
Administration, Topical, Animals, Antigens, Neoplasm, Antineoplastic Agents, Catechin, Female, Immune Tolerance, Mice, Inbred BALB C, Skin Neoplasms, Tea, Ultraviolet Rays, Mice

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