title: MPTP metabolites inhibit rat brain glutathione S-transferases.
abstract: 1-Methyl-4-phenyl-2,3-dihydropyridinium and 1-methyl-4-phenyl-pyridinium species, metabolites of the neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine, non-competitively inhibit glutathione S-transferases of rat brain in vitro. The Ki values for 1-methyl-4-phenyl-2,3-dihydropyridinium bromide and 1-methyl-4-phenyl-pyridinium bromide are 0.67 and 0.3 mM, respectively. Inhibition of these enzymes may lead to impairment of cellular defense mechanisms.
mesh_terms: D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D000818:Animals; D001921:Brain / Q000201:enzymology*; D005982:Glutathione Transferase / Q000037:antagonists & inhibitors*; D007700:Kinetics; D011725:Pyridines / Q000494:pharmacology*; D051381:Rats; D013329:Structure-Activity Relationship
chemical_list: D011725:Pyridines; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D005982:Glutathione Transferase