The specific anti-cancer activity of green tea (-)-epigallocatechin-3-gallate (EGCG)

Y. C. Wang, U. Bachrach

Research output: Contribution to journalArticle

Abstract

The effect of the green tea polyphenol-(-)epigallocatechin-3-gallate (EGCG) was tested in cultures of normal and transformed NIH-pATMras fibroblasts. In this system transformation can be induced at will by the addition of dexamethasone, which induces the expression of H-ras by activating the mammary tumor virus long terminal repeat (MMTV-LTR) promoter. This facilitates a reliable comparison of the susceptibility of normal and transformed cells to EGCG. It has been shown that EGCG inhibited the growth of transformed but not of the normal fibroblasts. In an attempt to elucidate the mode of the preferential inhibitory activity of EGCG, its effect on growth promoting factors has been examined. The level of ornithine decarboxylase (ODC, EC 4.1.1.17), which is a signal for cellular proliferation, was reduced by EGCG in the transformed but not in the normal cells. EGCG also showed strong inhibition of tyrosine kinase and mitogen-activated protein kinase (MAPK) activities, without affecting the kinases in the normal cells. Similarly, EGCG also preferentially decreased the levels of the oncogenes Ras and Jun in transformed cell. EGCG preferentially induced apoptosis in the transformed fibroblasts. In vitro chemosen-sitivity tests demonstrated that EGCG inhibited the proliferation of leukemic cells. These findings suggest that EGCG has a therapeutic potential in the combat against cancer.

Original languageEnglish (US)
Pages (from-to)131-143
Number of pages13
JournalAmino Acids
Volume22
Issue number2
DOIs
StatePublished - Apr 6 2002

Keywords

  • (-)-Epigallocatechin-3-gallate (EGCG)
  • Amino acids
  • Apoptosis
  • Mitogen-activated protein kinase (MAPK)
  • Oncogene
  • Ornithine decarboxylase (ODC)
  • Tyrosine kinase

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Organic Chemistry

Fingerprint Dive into the research topics of 'The specific anti-cancer activity of green tea (-)-epigallocatechin-3-gallate (EGCG)'. Together they form a unique fingerprint.

  • Cite this