1-methyl-4-phenylpyridinium ion ( mpp+ ) , a metabolite of a neurotoxin , 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine , was found to reduce dopamine ( da ) level and the activity of enzymes related to its metabolism in clonal rat pheochromocytoma pc12h cells .
C0013030
dopamine
C0031511
pheochromocytoma