, Volume 31, Issue 1–2, pp 37–44 | Cite as

Effects of green, oolong and black teas and related components on the proliferation and invasion of hepatoma cells in culture

  • Guoying Zhang
  • Yutaka Miura
  • Kazumi Yagasaki


The effects of teas and related components on the proliferation and invasion of cancer cells were examined by employing both in vitro proliferation and invasion assay systems. Powdered green, oolong and black tea extracts dose-dependently inhibited proliferation and invasion of a rat ascites hepatoma cell line of AH109A but did not affect the proliferation of the normal mesentery-derived mesothelial cells (M-cells) isolated from rats; higher concentrations of powdered oolong and black teas could restrain the proliferation of another tumor cell line of L929. The AH109A cells were found to penetrate underneath the monolayer of M-cells in the presence of 10% calf serum. When each rat serum obtained at 0.5, 1, 2, 3 and 5 h after oral intubation of each tea extract was added to the culture media instead of calf serum at a concentration of 10%, both the invasion and proliferation of AH109A were significantly suppressed. These ex vivo results suggest the potential bioavailability of effective tea components in rats. Furthermore, (–)-epigallocatechin gallate, (–)-epicatechin gallate and (–)-epigallocatechin from green tea as well as the mixture of theaflavin and theaflavin gallates from black tea were shown to be the most effective components against the invasion and proliferation of AH109A. These results show that the inhibitory effects of the teas and related components against AH109A cells are due to the cell-specific and higher sensitivity of the cell line to tea components.

catechins hepatoma cells invasion proliferation teas 


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© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Guoying Zhang
  • Yutaka Miura
  • Kazumi Yagasaki

There are no affiliations available

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