Excitatory and Inhibitory Junction Potentials Recorded from the Red Muscle of Marine Teleost, Puffer Fish : Physiology

概要

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Junction potentials were recorded from the red muscle of two species of the marine teleost, puffer fish. Takifugu poecilonotus and T. rubripes. Three types of potential change, the excitatory junction potential (ejp), the inhibitory junction potential (ijp) and the diphasic junction potential composed of ejp and ijp, were elicited by the nerve stimulation, and the miniature excitatory junction potential (mejp) and the miniature inhibitory junction potential (mijp) were observed in the resting muscle. Thus, this muscle received the innervations from both excitatory and inhibitory nerves and the excitatory innervations were much more abundant than the inhibitory ones. Nicotinic antagonist of acetylcholine (ACh), d-tubocurarine (d-TC), suppressed ejp, ijp, mejp and mijp and anticholinesterase, neostigmine, augmented them, while muscarinic antagonist of ACh, atropine, did not affect them. The results suggested that the excitatory and the inhibitory neuromuscular transmissions of this muscle were cholinergic and the nature of the receptors was nicotinic. The present observations obtained in the marine teleost were almost the same as those reported in the freshwater teleost, silver carp.
社団法人日本動物学会の論文
1988-10-15