Related Experiment Videos
Anticarcinogenic effects of (-)-epigallocatechin gallate
H Fujiki1, S Yoshizawa, T Horiuchi
1Cancer Prevention Division, National Cancer Center Research Institute, Tokyo, Japan.
Background:
Our research objective is to develop nontoxic cancer chemopreventive agents and to apply these agents in treating humans. We are identifying agents that inhibit the process of tumor promotion in two-stage carcinogenesis experiments on mouse skin.
Methods:
We review (a) the inhibitory effect of penta-O-galloyl-beta-D-glucose (5GG) on tumor promotion by teleocidin, one of the 12-O-tetradecanoylphorbol-13-acetate (TPA)-type tumor promoters (5GG is structurally similar to (-)-epigallocatechin gallate (EGCG) and is isolated from hydrolyzed tannic acid); (b) the inhibitory effects of EGCG, the main constituent of Japanese green tea, on tumor promotion with two tumor promoters, teleocidin and okadaic acid, a non-TPA-type tumor promoter; (c) the mechanisms of action of EGCG, a single application of which reduced the specific binding of [3H]TPA and [3H]okadaic acid to a particulate fraction of mouse skin; and (d) the anticarcinogenic effects of EGCG on duodenal carcinogenesis induced by N-ethyl-N'-nitro-N-nitrosoguanidine in male C57BL/6 mice. EGCG is a nontoxic compound.
Conclusion:
We believe that the main constituent of Japanese green tea, EGCG, is a practical cancer chemopreventive agent available in everyday life.
Insights
(-)-Epigallocatechin gallate (EGCG), found in green tea, shows promise as a nontoxic cancer chemopreventive agent. It effectively inhibits tumor promotion in mouse models, suggesting potential for human cancer prevention.
Area of Science:
- Chemoprevention
- Cancer Research
- Natural Products
Background:
- Developing nontoxic cancer chemopreventive agents is crucial for human treatment.
- Identifying agents that inhibit tumor promotion in two-stage carcinogenesis models is a key strategy.
Purpose of the Study:
- To evaluate the chemopreventive potential of penta-O-galloyl-beta-D-glucose (5GG) and (-)-epigallocatechin gallate (EGCG).
- To investigate the mechanisms of action and anticarcinogenic effects of EGCG.
Main Methods:
- Assessed the inhibitory effects of 5GG and EGCG on tumor promotion by teleocidin and okadaic acid in mouse skin models.
- Examined the impact of EGCG on specific binding of tumor promoters to mouse skin particulate fractions.
- Evaluated the anticarcinogenic effects of EGCG against chemically induced duodenal cancer in mice.
Main Results:
- EGCG demonstrated significant inhibition of tumor promotion by both TPA-type and non-TPA-type promoters.
- A single application of EGCG reduced the binding of [3H]TPA and [3H]okadaic acid to mouse skin particulate fractions.
- EGCG exhibited anticarcinogenic effects against duodenal carcinogenesis.
Conclusions:
- (-)-Epigallocatechin gallate (EGCG), a major component of Japanese green tea, is a practical and nontoxic cancer chemopreventive agent.
- EGCG holds significant potential for use in cancer prevention strategies.