The electrical property, chemoreceptivity and synaptic transmission of autonomic neurons

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This team has accomplished the following studies in the past three years beginning 1985:1. In-vitro study of sympathetic preganglionic neurons (cat); the resting and active membrane characteristics, ionic conductances, chemoreceptivities, fast and slow synaptic potentials and their chemical transmitters, and the modulatory action of noradrenaline has been clarified.2. In-vitro study of limbic neurons and central monoaminergic neurons; among these neurons, hippocampal pyramidal neurons have been subjected to the investigation of the effect of hypoxia. Hypoxia caused biphasic (hyper-polarizing-depolarizing) memrane potential changes. These changes can be attributed, respectively, to the primary and the secondary alteration resulted from an excessive entry of Ca ions into the cytoplasm. The study of dopamine action on neurons of the nucleus accumbens revealed that dopamine produces hyperpolarization via D-1 receptors and depolarization via D-2 receptors.3. Study of peptidergic transmission in sympathetic ganglia (frog) ; the mode of liberation of LHRH and acetylcholine which coexist in the preganglionic C nerve fiber terminals and the intracellular modulating system for the LHRH-mediating slow synaptic potential have been characterized.4. Study of enteric submucous plexus neurons (guinea-pig) ; electrogeneses, chemical transmitter substances and intracellular signal transductions for the slow EPSP and slow IPSP have been clarified.5. Study of intracardiac (parasympathetic) ganglion cells (guinea-pig) ; analysis of the nose currents associated withe the activation of nicotinic receptors revealed two kinds of receptor-ionophore complexes which characteristically differ in open time.