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    Eur J Pharmacol. 1981 Aug 27;74(1):73-81.

    In vivo modulation of the number of muscarinic receptors in rat brain by cholinergic ligands.

    Abstract

    Administration of the muscarinic agonist oxotremorine led to a decrease in the number of muscarinic receptors, as determined by specific binding of [3H]quinuclidinyl benzilate ([3H]QNB), in several rat brain regions both during development and at maturity. In contrast, administration of the muscarinic antagonist scopolamine led to an increase in the number of [3H]QNB-binding sites in various brain regions. Scopolamine also prevented the decrease in the number of [3H]QNB-binding sites induced by administration of an organophosphorus drug. The results are compatible with the hypothesis that the number of brain muscarinic receptors, or at least of a sub-class of them, is regulated by their transmitter.

    PMID:
    7318895
    [PubMed - indexed for MEDLINE]

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