title: Striatal synaptosomal dopamine synthesis: evidence against direct regulation by an autoreceptor mechanism.
abstract: Regulation of the rate-limiting step in dopamine (DA) synthesis was estimated in striatal synaptosomes by measuring the rate of hydroxylation of L-4-[3H]phenylalanine, a substrate of tyrosine hydroxylase (TH). DA inhibited hydroxylation with an IC50 of 0.2 microM. The concentration-response curve of DA-induced inhibition was not affected by the presence of 1 microM chlorpromazine, a phenothiazine DA antagonist. Sulpiride and haloperidol, DA antagonists of the benzamide and butyrophenone classes respectively, also failed to alter the inhibition of substrate hydroxylation by 1 microM DA, even at concentrations up to 10 microM. In contrast, a parallel 15 fold shift to the right in the concentration-response curve of DA-induced inhibition of hydroxylation was obtained when 10 microM nomifensine, a competitive DA uptake inhibitor, was added. Even in the presence of nomifensine, 1 microM chlorpromazine had no effect on the DA concentration-response curve. The addition of DMPH4, an artificial cofactor for TH, completely blocked DA-induced inhibition of enzymatic activity. These data suggest that direct autoreceptor control of synaptosomal TH activity does not exist in vitro, and that DA-induced inhibition of TH occurs subsequent to reuptake via classical feedback inhibition, presumably by competitive displacement of the necessary endogenous cofactor.
authors.forename: D R
authors.initials: DR
authors.lastname: Compton
authors.forename: K M
authors.initials: KM
authors.lastname: Johnson
mesh_terms: D000818:Animals; D002746:Chlorpromazine / Q000494:pharmacology; D003342:Corpus Striatum / Q000378:metabolism*; D004298:Dopamine / Q000096:biosynthesis*; D018492:Dopamine Antagonists; D006220:Haloperidol / Q000494:pharmacology; D006900:Hydroxylation; D066298:In Vitro Techniques; D008297:Male; D009627:Nomifensine / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000378:metabolism*; D013469:Sulpiride / Q000494:pharmacology; D013574:Synaptosomes / Q000378:metabolism*; D014446:Tyrosine 3-Monooxygenase / Q000037:antagonists & inhibitors
chemical_list: D018492:Dopamine Antagonists; D011954:Receptors, Dopamine; D009627:Nomifensine; D013469:Sulpiride; D014446:Tyrosine 3-Monooxygenase; D006220:Haloperidol; D002746:Chlorpromazine; D004298:Dopamine