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Changes in the Asynchronicity of Transmitter Release at the Neuromuscular Junction during Prolonged High-Frequency Stimulation

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Abstract

In experiments on neuromuscular junctions in the frog m. cutaneous-pectoris, changes in the intensity and asynchronicity of transmitter release during high-frequency (10 and 50 sec-1) rhythmic stimulation of the motor nerve were investigated using extracellular recording. At low extracellular Ca2+ concentrations, rhythmic stimulation resulted in a gradual enlargement of the quantum content of end-plate currents (EPC), the so-called facilitation. The latter phenomenon was accompanied by an increase in the average value and variance of synaptic delays of single-quantum EPC, a shift of the main mode of their distribution towards greater values, and an increase in the latency of the nerve ending responses. The above-described changes reduce the magnitude of facilitation in the neuromuscular synapse.

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Authors and Affiliations

  1. Kazan State Medical University, Russia

    A. L. Zefirov, M. A. Moukhamediarov & G. G. Sitdikova

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  1. A. L. Zefirov
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  2. M. A. Moukhamediarov
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  3. G. G. Sitdikova
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Correspondence to M. A. Moukhamediarov.

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Zefirov, A.L., Moukhamediarov, M.A. & Sitdikova, G.G. Changes in the Asynchronicity of Transmitter Release at the Neuromuscular Junction during Prolonged High-Frequency Stimulation. Neurophysiology 34, 264–266 (2002). https://doi.org/10.1023/A:1020708912769

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  • DOI: https://doi.org/10.1023/A:1020708912769

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