Synergistic effects of (--)-epigallocatechin gallate with (--)-epicatechin, sulindac, or tamoxifen on cancer-preventive activity in the human lung cancer cell line PC-9.
The study on incorporation of [3H](-)-epigallocatechin gallate (EGCG) into human lung cancer cell line PC-9 indicated that the [3H]EGCG incorporation was significantly enhanced by (-)-epicatechin, an inert tea polyphenol without a galloyl moiety. (-)-Epicatechin enhanced apoptosis, growth inhibition of PC-9 cells, and inhibition of tumor necrosis factor-alpha release from BALB/c-3T3 cells by EGCG and other tea polyphenols with a galloyl moiety in a dose-dependent manner. Moreover, the effects of EGCG on induction of apoptosis were also synergistically enhanced by other cancer-preventive agents, such as sulindac and tamoxifen. This paper reports significant evidence that whole green tea is a more reasonable mixture of tea polyphenols for cancer prevention in humans than EGCG alone and that it is even more effective when it is used in combination with other cancer preventives.
Suganuma
M
M
Saitama Cancer Center Research Institute, Japan.
Okabe
S
S
Kai
Y
Y
Sueoka
N
N
Sueoka
E
E
Fujiki
H
H
D016475:3T3 Cells; D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology* / Q000627:therapeutic use; D002455:Cell Division / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000517:prevention & control*; D051379:Mice; D013467:Sulindac / Q000494:pharmacology* / Q000627:therapeutic use; D013629:Tamoxifen / Q000494:pharmacology* / Q000627:therapeutic use; D013662:Tea; D014407:Tumor Cells, Cultured
D016588:Anticarcinogenic Agents; D013662:Tea; D013629:Tamoxifen; D013467:Sulindac; D002392:Catechin; C045651:epigallocatechin gallate