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Adrenaline Facilitates Synaptic Transmission by Synchronizing Release of Acetylcholine Quanta from Motor Nerve Endings

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Abstract

The long history of studies on the effect of catecholamines on synaptic transmission does not answer the main question about the mechanism of their action on quantal release in the neuromuscular junction. Currently, interest in catecholamines has increased not only because of their widespread use in the clinic for the treatment of cardiovascular and pulmonary diseases but also because of recent data on their possible use for the treatment of certain neurodegenerative diseases, muscle weakness and amyotrophic sclerosis. Nevertheless, the effects and mechanisms of catecholamines on acetylcholine release remain unclear. We investigated the action of noradrenaline and adrenaline on the spontaneous and evoked quantal secretion of acetylcholine in the neuromuscular junction of the rat soleus muscle. Noradrenaline (10 μM) did not change the spontaneous acetylcholine quantal release, the number of released quanta after nerve stimulation, or the timing of the quantal secretion. However, adrenaline at the same concentration increased spontaneous secretion by 40%, increased evoked acetylcholine quantal release by 62%, and synchronized secretion. These effects differ from those previously described by us in the synapses of the frog cutaneous pectoris muscle and mouse diaphragm. This indicates specificity in catecholamine action that depends on the functional type of muscle and the need to take the targeted type of muscle into account in clinical practice.

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Acknowledgements

This work was supported by the Russian Science Foundation (Project No. 18-15-00046). The investigation of the catecholamine’s autoxidation was supported by government assignment for FRC Kazan Scientific Center of RAS. We are grateful to Svetlana Dmitrieva for her help in doing the catecholamine’s autoxidation analysis.

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VK and EB contributed equally to the manuscript.

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Correspondence to Venera Khuzakhmetova.

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The authors declare that they have no conflict of interest.

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The study conformed to the Guide for the Care and Use of Laboratory Animals (NIH Publication No. 85-23, revised 1996) and the European Convention for the Protection of Vertebrate Animals Used for Experimental and Other (Int. J. Mol. Sci. 2019, 20, 4860 10 of 17) Scientific Purposes (Council of Europe No. 123, Strasbourg, 1985). The experimental protocol met the requirements of the EU Directive 2010/63/EU and was approved by the Bioethics Committees of Kazan State Medical University (Protocol #3/ 29 Jan 2016).

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Khuzakhmetova, V., Bukharaeva, E. Adrenaline Facilitates Synaptic Transmission by Synchronizing Release of Acetylcholine Quanta from Motor Nerve Endings. Cell Mol Neurobiol 41, 395–401 (2021). https://doi.org/10.1007/s10571-020-00840-3

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  • DOI: https://doi.org/10.1007/s10571-020-00840-3

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