On the role of cholinergic, adrenergic and tryptamin- ergic mechanisms in the regulation of a „catch” muscle (Anodonta cygnea L.)

Salánki, János and Lábos, Elemér (1969) On the role of cholinergic, adrenergic and tryptamin- ergic mechanisms in the regulation of a „catch” muscle (Anodonta cygnea L.). A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 36. pp. 77-93. ISSN 0365-3005

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Abstract

The spontaneous activity as well as the evoked responses of the posterior adductor of Anodonta cygnea were investigated after intramuscular injection of cholinergic, adrenergic and tryptaminergic substances. We found: 1. Ach in large doses, TMA and nicotine in low concentrations cause tonic contraction. Mytolon and TEAC increase the frequency of the spontaneous phasic contractions. Prostigmine, eserine, curare, hexamethonium and atropine are ineffective or act indefinitely.2. Adrenaline, noradrenaline, and 1PNA cause tonic contraction and increase the rhythmic activity. Dopamine and tyramine in large doses increase the rhythm but inhibit the tone. Dibenamine in large dose acts similarly to adrenaline. Ergotamine and DCI are ineffective. 3. 5HT inhibits both tone and rhythm, tryptamine decreases tone but enhances rhythm. BOL-148 increases both tone and rhythm, while ergometrine results an increase in the rhythm. 4. With stimulation of the cerebrо-visceral connective the tonic contraction caused by ACh could be relaxed to some extent while the TMA and nicotine tonus remaind nearly intact. It is supposed, that in the regulation of the adductor actvity in the fresh water mussel an adrenergic-tryptaminergic antagonism exists.

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