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• W2007789679 abstract "Without the brainstem, thoracic spinal cords of neonatal rats in vitro spontaneously generate tonic sympathetic nerve discharge (SND) in the splanchnic nerves. Activation of nicotinic receptors in cords is known to alter a repertoire of neurotransmitter releases to sympathetic preganglionic neurons (SPNs). Using in vitro nerve-cord preparations, we investigated whether endogenous nicotinic receptor activity is essential for SND genesis. Application of mecamylamine, an open-channel nicotinic receptor blocker, reduced SND in a progressive manner. Exogenous activation of nicotinic receptors by application of various nicotinic agonists generally excited SND at low agonistic concentrations. At higher concentrations, however, agonists induced biphasic responses characterized by an initial excitation followed by prolonged SND suppression. Whether ionotropic glutamate, GABA(A), or glycine receptors are downstream signals of nicotinic receptor activation was explored by pretreatment of cords with selective antagonists. The initial excitation of SND persisted in the presence of ionotropic glutamate receptor antagonists. In contrast, the SND suppression was partially reversed by glycine or GABA(A) receptor antagonists. Incubation of the cord in a low Ca(2+)/high Mg(2+) bath solution to block Ca(2+)-dependent synaptic transmission did not affect SND excitation induced by nicotinic agonists, confirming direct activation of postsynaptic nicotinic receptors on SPNs. In conclusion, the endogenous activity of nicotinic receptors is essential for SND genesis in the thoracic spinal cord. Nicotinic activation of glycinergic and GABAergic interneurons may provide a recurrent inhibition of SPNs for homeostatic regulation of sympathetic outflow." @default.
• W2007789679 created "2016-06-24" @default.
• W2007789679 creator A5041914967 @default.
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• W2007789679 date "2006-12-01" @default.
• W2007789679 modified "2023-10-14" @default.
• W2007789679 title "Endogenous activation of nicotinic receptors underlies sympathetic tone generation in neonatal rat spinal cord in vitro" @default.
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• W2007789679 doi "https://doi.org/10.1016/j.neuropharm.2006.06.015" @default.
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