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The role of calcium in modulation of the kinetics of synchronous and asynchronous quantal release at the neuromuscular junction

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The role of calcium in modulation of the kinetics of synchronous and asynchronous quantal release at the neuromuscular junction

Content Provider	Springer Nature Link
Author	Vasin, A. L. Samigullin, D. V. Bukharaeva, E. A.
Copyright Year	2010
Abstract	To elucidate the mechanisms of calcium regulation of the kinetics of the evoked neurotransmitter quantal release, we have investigated the temporal parameters of acetylcholine secretion in the mouse neuro-muscular junction at varying extracellular calcium concentration, in the presence of calcium channel blockers or intracellular calcium buffers. Acetylcholine secretion was induced by the motor nerve stimulation at a low frequency, which did not produce facilitation of the neurotransmitter release. The analysis of histograms of synaptic delays of uniquantal endplate currents recorded during 50 ms after the presynaptic action potential revealed three components of the secretion process: early and late periods of synchronous release and a delayed asynchronous release. At reduced extracellular calcium level, the relative number of quanta released during the asynchronous phase of secretion increased, while the rate of quantal release during the early synchronous period decreased. The findings support the hypothesis of participation of low- and high-affinity calcium sensors with different calcium binding kinetics in regulation of, respectively, synchronous and asynchronous release of neurotransmitter quanta.
Starting Page	77
Ending Page	84
Page Count	8
File Format	PDF
ISSN	19907478
Journal	Biochemistry (Moscow) Supplement Series A: Membrane and Cell Biology
Volume Number	4
Issue Number	1
e-ISSN	19907494
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-03-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	neuromuscular junction calcium ions secretion kinetics synchronous and asynchronous release of transmitter quanta Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Biophysics

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