Abstract
The effects of VU 0238429, an allosteric modulator of muscarinic acetylcholine (ACh) M5 receptor, on the amplitude and temporal parameters of spontaneous and evoked endplate potentials, as well as on the force of muscle contractions in different modes of motor nerve stimulation, were studied. It was shown that M5 cholinoreceptors regulate the quantal release of acetylcholine from motor nerve endings in the mouse diaphragm. Specifically, M5 activation increases the level of ACh release during low-frequency nerve stimulation (0.5 Hz) and enhances synaptic depression at 70 Hz. Pharmacological potentiation of M5 cholinoreceptors exerts a depressing effect on the force of skeletal muscle contractions at stimulation frequencies in the range from 0.5 to 70 Hz, which must be considered when developing new drugs aimed at affecting M5 cholinoreceptors.
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Funding
Electrophysiological studies were supported by the Russian Foundation for Basic Research grant No. 20-04-00571; the experiments on recording muscle contractions were implemented within a governmental assignment to the Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of the Russian Academy of Sciences.
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The basic idea and experimental design (I.V.K., A.I.M.); data collection (A.A.Kh., N.S.F.); data processing (I.V.K., A.A.Kh., N.S.F., A.I.M.); writing and editing a manuscript (I.V.K., A.I.M.).
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Translated by A. Polyanovsky
Russian Text © The Author(s), 2022, published in Rossiiskii Fiziologicheskii Zhurnal imeni I.M. Sechenova, 2022, Vol. 108, No. 1, pp. 98–108https://doi.org/10.31857/S0869813922010083.
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Kovyazina, I.V., Khamidullina, A.A., Fedorov, N.S. et al. Effects of VU 0238429, an Allosteric Modulator of M5 Cholinoreceptors, on Neuromuscular Transmission in the Mouse Diaphragm. J Evol Biochem Phys 58, 149–157 (2022). https://doi.org/10.1134/S0022093022010136
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DOI: https://doi.org/10.1134/S0022093022010136