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• W1984237754 abstract "The consequences of irreversibly-inhibiting D2 dopaminergic receptors on the expression of D1 and D2 dopamine receptor mRNAs and proenkephalin mRNA and on the levels of mu- and delta-opioid receptors in rat striatum were studied following single or repeated administration of the irreversibly-acting D2 dopamine receptor antagonist, fluphenazine-N-mustard (FNM). The density of dopamine and opioid receptors was determined by receptor autoradiography and the levels of the mRNA for the D1 and D2 dopamine receptors and proenkephalin were measured by in situ hybridization histochemistry. Repeated treatment of rats with FNM for 6 days produced more than 80% inhibition of D2 dopamine receptors but less than 25% inhibition of D1 dopamine receptors. Repeated treatment with FNM also resulted in statistically significant increases in D2 dopamine receptor mRNA but decreases in D1 dopamine receptor mRNA. In contrast, acute treatment with FNM for 3 h had no significant effects on D1 or D2 dopamine receptor mRNAs in striatum. An examination of the effects of FNM on the opioid system showed that repeated treatment with FNM for 6 days produced more than a 2-fold increase in the expression of proenkephalin mRNA in striatum. This was accompanied by significant decreases in mu- and delta-opioid receptors in striatum, mainly by reducing the size of the patch compartment of striatum. Acute treatment with FNM for 3 h produced small increases in proenkephalin mRNA and mu-opioid receptors in striatum but had no significant effects on delta-opioid receptors. These results suggest that persistent inhibition of D2 dopamine receptors differentially regulates the expression of D1 and D2 dopamine receptor mRNA in striatum, and that the magnitude, duration and interval of inhibiting dopaminergic transmission may be important factors in regulating dopamine receptor mRNA expression. These results also suggest that D2 dopamine antagonists indirectly down-regulate opioid receptors by increasing the expression of proenkephalin mRNA, thereby increasing enkephalin which, in turn, decreases opioid receptors in striatum." @default.
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• W1984237754 date "1994-10-01" @default.
• W1984237754 modified "2023-10-16" @default.
• W1984237754 title "Irreversible blockade of D2 dopamine receptors by fluphenazine-N-mustard increases D2 dopamine receptor mRNA and proenkephalin mRNA and decreases D1 dopamine receptor mRNA and mu and delta opioid receptors in rat striatum" @default.
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• W1984237754 doi "https://doi.org/10.1016/0197-0186(94)90143-0" @default.
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