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Abstract

M-1 and M-2 muscarinic receptor-mediated inhibition of dopamine-sensitive adenylate cyclase in rat neostriatum: a permissive role for D-2 dopamine receptors.

A N Schoffelmeer, F Hogenboom and A H Mulder
Journal of Pharmacology and Experimental Therapeutics May 1988, 245 (2) 658-663;
A N Schoffelmeer
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F Hogenboom
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A H Mulder
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Abstract

The interactions between dopamine and muscarinic receptor subtypes coupled to adenylate cyclase in superfused rat neostriatal slices were investigated using the efflux of cyclic AMP, in the presence of the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine, as a highly sensitive parameter of cyclic AMP production. Cyclic AMP efflux induced by simultaneous activation of (stimulatory) D-1 and (inhibitory) D-2 dopamine receptors by dopamine was reduced profoundly by the muscarinic receptor agonist oxotremorine and by inhibition of acetylcholinesterase with physostigmine, but not by the M-1 muscarinic receptor agonist McN-A-343. In contrast, upon blockade of D-2 receptors with (-)-sulpiride, dopamine-stimulated cyclic AMP efflux was inhibited by oxotremorine and physostigmine as well as by McN-A-343. Cyclic AMP efflux induced by isoprenaline, adenosine or vasoactive intestinal peptide was not affected by oxotremorine. The M-1 receptor-selective antagonist pirenzepine, unlike the nonselective antagonist atropine, was about 10 times less potent in antagonizing the inhibitory effects of (a near-maximally effective concentration of) oxotremorine upon simultaneous D-1 and D-2 receptor activation that upon selective D-1 receptor activation (i.e., upon blockade of D-2 receptors). In the latter case, pirenzepine was about 5 times more effective as an antagonist when muscarinic receptors were activated by McN-A-343 than upon exposure of the slices to oxotremorine or physostigmine, whereas the potency of atropine was independent of the agonist used.(ABSTRACT TRUNCATED AT 250 WORDS)

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Journal of Pharmacology and Experimental Therapeutics
Vol. 245, Issue 2
1 May 1988
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Abstract

M-1 and M-2 muscarinic receptor-mediated inhibition of dopamine-sensitive adenylate cyclase in rat neostriatum: a permissive role for D-2 dopamine receptors.

A N Schoffelmeer, F Hogenboom and A H Mulder
Journal of Pharmacology and Experimental Therapeutics May 1, 1988, 245 (2) 658-663;

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Abstract

M-1 and M-2 muscarinic receptor-mediated inhibition of dopamine-sensitive adenylate cyclase in rat neostriatum: a permissive role for D-2 dopamine receptors.

A N Schoffelmeer, F Hogenboom and A H Mulder
Journal of Pharmacology and Experimental Therapeutics May 1, 1988, 245 (2) 658-663;
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