Heterogeneity of neuronal nicotinic acetylcholine receptors: Structural and functional aspects |
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Authors: | V. I. Skok S. V. Voitenko A. Yu. Bobryshev L. P. Voitenko M. V. Skok |
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Affiliation: | (1) Bogomolets Institute of Physiology, National Academy of Science of Science of Ukraine, Kyiv, Ukraine |
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Abstract: | Decay kinetics of the postsynaptic excitatory currents (EPSC), distribution of the antibodies specific to different α-subunits of neuronal nicotinic acetylcholine receptors (nAChR), and the effects of these antibodies on ACh-induced membrane currents were studied in neurons of different autonomic ganglia of rats. It was shown that α3-, α5- and α7-subunits were present in all studied cultured neurons of the rat superior cervical ganglion (SCG), while the α4-subunit was present only in about half of the neurons; this α-subunit distribution differed from that in cultured intracardial neurons of rats. Two nAChR populations were found in rat SCG neurons, and a series of nAChR populations were found in murine superior mesenteric ganglion neurons; they differed in kinetics of their ion channel activity, voltage dependence and the rate of their open channel blockade. The possible functional role of neuronal nAChR heterogeneity is discussed. |
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