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- W2017831452 abstract "Scopolamine produces rapid and significant symptom improvement in patients with depression, and most notably in patients who do not respond to current antidepressant treatments. Scopolamine is a nonselective muscarinic acetylcholine receptor antagonist, and it is not known which one or more of the five receptor subtypes in the muscarinic family are mediating these therapeutic effects. We used the mouse forced-swim test, an antidepressant detecting assay, in wild-type and transgenic mice in which each muscarinic receptor subtype had been genetically deleted to define the relevant receptor subtypes. Only the M<sub>1</sub> and M<sub>2</sub> knockout (KO) mice had a blunted response to scopolamine in the forced-swim assay. In contrast, the effects of the tricyclic antidepressant imipramine were not significantly altered by gene deletion of any of the five muscarinic receptors. The muscarinic antagonists biperiden, pirenzepine, and VU0255035 (<i>N</i>-[3-oxo-3-[4-(4-pyridinyl)-1-piper azinyl]propyl]-2,1,3-benzothiadiazole-4-sulfonamide) with selectivity for M<sub>1</sub> over M<sub>2</sub> receptors also demonstrated activity in the forced-swim test, which was attenuated in M<sub>1</sub> but not M<sub>2</sub> receptor KO mice. An antagonist with selectivity of M<sub>2</sub> over M<sub>1</sub> receptors (SCH226206 [(2-amino-3-methyl-phenyl)-[4-[4-[[4-(3 chlorophenyl)sulfonylphenyl]methyl]-1-piperidyl]-1-piperidyl]methanone]) was also active in the forced-swim assay, and the effects were deleted in M<sub>2</sub><sup>−/−</sup> mice. Brain exposure and locomotor activity in the KO mice demonstrated that these behavioral effects of scopolamine are pharmacodynamic in nature. These data establish muscarinic M<sub>1</sub> and M<sub>2</sub> receptors as sufficient to generate behavioral effects consistent with an antidepressant phenotype and therefore as potential targets in the antidepressant effects of scopolamine." @default.
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- W2017831452 date "2014-09-03" @default.
- W2017831452 modified "2023-09-27" @default.
- W2017831452 title "M<sub>1</sub>and M<sub>2</sub>Muscarinic Receptor Subtypes Regulate Antidepressant-Like Effects of the Rapidly Acting Antidepressant Scopolamine" @default.
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- W2017831452 doi "https://doi.org/10.1124/jpet.114.216804" @default.
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