since the inhibitory effects of cys on both the decrease in the ratio of gsh/gssg and the induction of odc activity by tpa were greatly reduced by the inhibitors of gamma-glutamyl transpeptidase and gamma-glutamylcysteine synthetase , it is suggested that some of the inhibitory effects of glu , cys and gly on tumor promotion could result from their interference with the metabolism of the tripeptide gsh , a natural antioxidant which inhibits chemical carcinogenesis .
C0061516
gssg
C0017817
gsh