Summary.
Whole-cell patch-clamp recording from rat superior cervical ganglion neurons in culture was used to investigate the modulatory effect of desensitized α7-nAChRs on mAChRs. An inward α-bungarotoxin and methyllycaconitine sensitive current was elicited by rapid application of choline, which consisted of a fast and a slow desensitizing component. The amplitude of choline-evoked currents recorded 0.5, 1, 2, and 3 min after the prolonged application of choline (10 mM, 30 s) decreased to 25.3 ± 9.2%, 45.9 ± 11.8%, 66.3 ± 14.5%, and 73.9 ± 13.3% of their baseline levels, respectively. The amplitudes of M-currents, recorded at the same time intervals after the similar prolonged stimulation with choline, were decreased to 52.7 ± 17.4%, 63.9 ± 4.2%, 70.9 ± 2.8%, and 72.9 ± 17.3% of initial values respectively by focal application of pilocarpine (1 mM, 5 s) onto the soma of neurons. By contrast, before the desensitization of α7-nAChRs, M-currents were only decreased to 79.8 ± 13.7% of baseline levels by pilocarpine (1 mM, 5 s). Whereas the desensitization of α7-nAChRs had no direct effects on M-currents, and the facilitated effects on muscarinic agonists on the M-currents induced by desensitized α7-nAChRs, were removed in the presence of α-bungarotoxin and methyllycaconitine. These results indicated that desensitization of α7-nAChRs could potentiate the inhibitory effect on M-current by stimulation of mAChRs with their agonist.
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Yin, X., Cui, W., Hu, G. et al. Desensitization of α7 nicotinic receptors potentiated the inhibitory effect on M-current induced by stimulation of muscarinic receptors in rat superior cervical ganglion neurons. J Neural Transm 112, 1133–1148 (2005). https://doi.org/10.1007/s00702-004-0260-6
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DOI: https://doi.org/10.1007/s00702-004-0260-6