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Synergistic effects of tea polyphenols and ascorbic acid on human lung adenocarcinoma
SPC-A-1 cells.
J Zhejiang Univ Sci B. 2010 Jun;11(6):458-64
Li W, et al
Department of Tea Science, Zhejiang University, Hangzhou 310029, China.
Abstract
Tea polyphenols have been shown to have anticancer activity in many studies.
In the present study, we investigated effects of theaflavin-3-3'-digallate (TF(3)), one of the major theaflavin monomers in black tea, in combination with ascorbic acid (AA), a reducing agent, and (-)-epigallocatechin-3-gallate (EGCG), the main polyphenol presented in green tea, in combination with AA on cellular viability and cell cycles of the human lung adenocarcinoma SPC-A-1 cells.
The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay showed that the 50% inhibition concentrations (IC(50)) of TF(3), EGCG, and AA on SPC-A-1 cells were 4.78, 4.90, and 30.62 micromol/L, respectively.
The inhibitory rates of TF(3) combined with AA (TF(3)+AA) and EGCG combined with AA (EGCG+AA) at a molar ratio of 1:6 on SPC-A-1 cells were 54.4% and 45.5%, respectively. Flow cytometry analysis showed that TF(3)+AA and EGCG+AA obviously increased the cell population in the G(0)/G(1) phase of the SPC-A-1 cell cycle from 53.9% to 62.8% and 60.0%, respectively.
TF(3)-treated cells exhibited 65.3% of the G(0)/G(1) phase at the concentration of its IC(50).
Therefore, TF(3)+AA and EGCG+AA had synergistic inhibition effects on the proliferation of SPC-A-1 cells, and significantly held SPC-A-1 cells in G(0)/G(1) phase.
The results suggest that the combination of TF(3) with AA or EGCG with AA enhances their anticancer activity.
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Green tea and cancer prevention.
Nutr Cancer. 2010 Oct;62(7):931-7.
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