Involvement of basal and calcium-activated protein kinase C in neurotransmitter secretion in mouse motor synapses.

A E Gaydukov, A A Marchenkova, O P Balezina

Department of Human and Animal Physiology, Biological Faculty, M. V. Lomonosov Moscow State University, Russia. gaydukov@gmail.com

Bulletin of experimental biology and medicine 2012 Oct

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Blocker of presynaptic protein kinase C isoforms, GF109203X, reduced quantal content of single and rhythmic evoked end-plate potentials. The increase in quantal content of single potentials under the effect of 4- aminopyridine was neutralized by 75% under the effect of L-type Ca(2+)-channel blocker nitrendipine and completely returned to the control level after protein kinase C inhibition with chelerythrine. Neither nitrendipine, nor GF109203X affected the potentiating effect of tetraethylammonium on quantal content of end-plate potentials. Thus, we discovered basal activity of presynaptic protein kinase C under normal conditions that is aimed at the maintenance of quantal content of evoked release. It has been concluded that 4-aminipyridine, but not tetraethylammonium, triggers Ca(2+) entry into the terminal, which activates protein kinase C and enhanced the evoked acetylcholine release.

Citation

A E Gaydukov, A A Marchenkova, O P Balezina. Involvement of basal and calcium-activated protein kinase C in neurotransmitter secretion in mouse motor synapses. Bulletin of experimental biology and medicine. 2012 Oct;153(6):820-3