Elsevier

Life Sciences

Volume 31, Issue 25, 20 December 1982, Pages 2883-2890
Life Sciences

Further evidence for the involvement of D2, but not D1 dopamine receptors in dopaminergic control of striatal cholinergic transmission

https://doi.org/10.1016/0024-3205(82)90679-8Get rights and content

Abstract

The relative involvement of D1 (cyclase linked) and D2 dopamine receptors in dopaminergic control of striatal cholinergic transmission has been investigated in the rat by comparing the effects of SKF 38393 and LY 141865 (which act as specific agonists at D1 and D2 dopamine receptors, respectively) on striatal acetylcholine and dopamine metabolite concentrations and on the potassium-evoked release of 3H-acetylcholine from rat striatal slices. LY 141865 given systemically produced a dose-dependent increase in acetylcholine concentrations and a concomitant reduction of homovanillic and dihydroxyphenylacetic acid levels in the striatum (ED50 0.1 mg/kg) whereas SKF 38393 (1–30 mg/kg) did not. SKF 38393 (30 mg/kg) also failed to modify the LY 141865 (1 mg/kg) induced alterations of striatal acetylcholine and dopamine metabolite levels when given concomitantly with the latter compound. In experiments in vitro, LY 141865 reduced (EC50 0.14 μM), whereas SKF 38393 (up to 100 μM) failed to affect, the potassium-evoked release of 3H-acetylcholine from striatal slices. When given concomitantly with LY 141865, SKF 38393 (10 μM) did not modify the ability of the former compound to diminish striatal 3H-acetylcholine release. Finally, SKF 38393 also failed to affect the release of striatal 3H-acetylcholine after chemical lesion of the nigro-striatal dopaminergic pathway. The present results provide evidence for the involvement of D2 but not D1 dopamine receptors in dopaminergic control of striatal cholinergic transmission and indicate that D1 dopamine receptors do not exert any modulatory influence on D2 dopamine receptor mediated dopaminergic transmission.

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