Physiological actions of the neuropeptide Antho-RNamide on antagonistic muscle systems in sea anemones

Antagonistic contractions of longitudinal and circular muscles in the body wall cause shape changes in sea anemones. Single electrode voltage clamp recordings from Calliactis parasitica body wall preparations distinguish two cells types (Types 1 and 2) with different time course of evoked inward cur...

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Bibliographic Details
Published in:Neuroscience letters 1996-11, Vol.219 (3), p.171-174
Main Authors: Cho, K., McFarlane, I.D.
Format: Article
Language:English
Subjects:
Animals
Anthozoa
Biological and medical sciences
Calliactis parasitica
Cnidaria. Ctenaria
Electric Conductivity
Fundamental and applied biological sciences. Psychology
Invertebrates
Marine
Muscle
Muscles - cytology
Muscles - drug effects
Muscles - physiology
Nerve net
Neuropeptides
Neuropeptides - pharmacology
Patch-Clamp Techniques
Sea anemones
Sea Anemones - physiology
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Summary:Antagonistic contractions of longitudinal and circular muscles in the body wall cause shape changes in sea anemones. Single electrode voltage clamp recordings from Calliactis parasitica body wall preparations distinguish two cells types (Types 1 and 2) with different time course of evoked inward current. The anthozoan neuropeptide Antho-RNamide ( l-3-phenyllactyl-Leu-Arg-Asn-NH 2) excites longitudinal body wall preparations and Type 1 cells, but inhibits circular body wall preparations and Type 2 cells. Type 1 and Type 2 cells may therefore belong to longitudinal and circular myoepithelium respectively. Antho-RNamide may open Ca 2+ channels in longitudinal muscle cells and K + channels in circular muscle cells. This opposite action of a neuropeptide is of significance in the control of antagonistic contractions.
ISSN:0304-3940
1872-7972
DOI:10.1016/S0304-3940(96)13193-1