Green tea polyphenol epigallocatechin-3-gallate differentially modulates oxidative stress in PC12 cell compartments

Haider Raza, Annie John

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

Tea polyphenols have been reported to be potent antioxidants and beneficial in oxidative stress related diseases. Prooxidant effects of tea polyphenols have also been reported in cell culture systems. In the present study, we have studied oxidative stress in the subcellular compartments of PC12 cells after treatment with different concentrations of the green tea polyphenol, epigallocatechin-3-gallate (EGCG). We have demonstrated that EGCG has differentially affected the production of reactive oxygen species (ROS), glutathione (GSH) metabolism and cytochrome P450 2E1 activity in the different subcellular compartments in PC12 cells. Our results have shown that although the cell survival was not inhibited by EGCG, there was, however, an increased DNA breakdown and activation of apoptotic markers, caspase 3 and poly- (ADP-ribose) polymerase (PARP) at higher concentrations of EGCG treatment. Our results suggest that the differential effects of EGCG might be related to the alterations in oxidative stress, GSH pools and CYP2E1 activity in different cellular compartments. These results may have implications in determining the chemopreventive therapeutic use of tea polyphenols in vivo.

Original languageEnglish
Pages (from-to)212-220
Number of pages9
JournalToxicology and Applied Pharmacology
Volume207
Issue number3
DOIs
Publication statusPublished - Sep 15 2005

Keywords

  • Apoptosis
  • GSH metabolism
  • Oxidative stress
  • PC12 cells
  • Tea polyphenol -EGCG

ASJC Scopus subject areas

  • Toxicology
  • Pharmacology

Fingerprint

Dive into the research topics of 'Green tea polyphenol epigallocatechin-3-gallate differentially modulates oxidative stress in PC12 cell compartments'. Together they form a unique fingerprint.

Cite this