Tyraminergic modulation of agonistic outcomes in crayfish

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
Yuto MomoharaToshiki Nagayama

Abstract

Octopamine, a biogenic amine, modulates various behaviors, ranging from locomotion and aggression to learning and memory in invertebrates. Several studies recently demonstrated that tyramine, the biological precursor of octopamine, also affects behaviors independent of octopamine. Here we investigated the involvement of tyramine in agonistic interaction of the male crayfish Procambarus clarkii. When male crayfish fight, larger animals (3-7% difference in body length) are more likely to win. By contrast, direct injection of tyramine or octopamine counteracted the physical advantage of larger animals. Tyramine or octopamine-injected naive large animals were mostly beaten by untreated smaller naive animals. This pharmacological effect was similar to the loser effect in which subordinate larger animals are frequently beaten by smaller animals. Furthermore, loser effects were partly eliminated by either injection of epinastine, an octopamine blocker, or yohimbine, a tyramine blocker, and significantly diminished by injection of a mixture of both blockers. We also observed that tyramine levels in the subesophageal ganglion were remarkably increased in subordinate crayfish after losing a fight. These results suggest that tyramine modu...Continue Reading

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Citations

Mar 1, 2019·The Journal of Experimental Biology·Kazuya TakahashiToshiki Nagayama
Jul 26, 2018·International Journal of Molecular Sciences·Leonor Mendoza-VargasHéctor Solís-Chagoyán
Feb 9, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Leonid L MorozAndrea B Kohn
Mar 28, 2021·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Toshiki Abe, Toshiki Nagayama
Apr 22, 2021·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Satomi Kamada, Toshiki Nagayama
Jun 16, 2021·The Journal of Experimental Biology·Kengo Ibuchi, Toshiki Nagayama

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Methods Mentioned

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Software Mentioned

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