title: Role of Zn2+ in epigallocatechin gallate affecting the growth of PC-3 cells.
abstract: Green tea has chemo-preventive effects to human carcinoma including prostate cancer. Epigallocatechin gallate (EGCG) is the major active component in green tea. Zn(2+) is indispensable to our health, and plays an important role in the normal function and pathology of the prostate gland, and might be a good marker for diagnosing prostate cancer. Effects of Zn(2+), EGCG and their interactions on the growth of androgen-insensitive prostate cancer cell (PC-3) were investigated in the present paper. The results show that Zn(2+) and EGCG inhibited the growth of PC-3 cells in a time- and dose-dependent manner, but effects of interactions of EGCG with Zn(2+) were extremely dependent on their concentrations and added orders. Inhibitory effects of Zn(2+) were significantly decreased in the presence of EGCG on PC-3 cell growth. Therefore, we hypothesize that complexation of EGCG with Zn(2+) might be responsible for the observed decrease of the bioactivities of Zn(2+) against PC-3 cells.
authors.affiliation: Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, PR China.
authors.forename: Xun
authors.initials: X
authors.lastname: Chen
authors.forename: Haining
authors.initials: H
authors.lastname: Yu
authors.forename: Shengrong
authors.initials: S
authors.lastname: Shen
authors.forename: Junjie
authors.initials: J
authors.lastname: Yin
mesh_terms: D016588:Anticarcinogenic Agents / Q000737:chemistry / Q000378:metabolism*; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D045744:Cell Line, Tumor; D002470:Cell Survival; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000378:metabolism*; D013662:Tea / Q000737:chemistry; D015032:Zinc / Q000737:chemistry / Q000378:metabolism*
chemical_list: D016588:Anticarcinogenic Agents; D013662:Tea; D002392:Catechin; C045651:epigallocatechin gallate; D015032:Zinc