NDLI: Role of Opioid Peptides in Behavior of Invertebrates

Content Provider	Springer Nature Link
Author	Dyakova, V. E.
Copyright Year	2001
Abstract	Opioid peptides have been revealed in representatives of practically all large taxonomic groups of invertebrates, and the opiate receptors are found even in unicellulars. The opioid system seems to belong to the evolutionary ancient signal systems. The comparative data indicate that the most conservative and ancient function of opioids is control of the adequate level of protective reactions. In the infusorian Stentor the opiate ligands suppress a contractile response to mechanical stimulation, i.e., the protective behavior. In all studies multicellular invertebrates, agonists also suppress protective behavior, whereas antagonists produce opposite effects. This initially signal meaning of opioids might have become a basis for divergent development of their functions in evolution. Already in higher invertebrates, molluscs and arthropods, many functions of opioids, for example, stress-induced analgesia, regulation of feeding and mating behavior, of social aggression, are similar to those in vertebrates. It is suggested that the main events in formation of functions of the endogenous opioid system have occurred in the lower invertebrates that have remained so far the least studied.
Starting Page	335
Ending Page	347
Page Count	13
File Format	PDF
ISSN	00220930
Journal	Journal of Evolutionary Biochemistry and Physiology
Volume Number	37
Issue Number	4
e-ISSN	16083202
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Ecology, Evolution, Behavior and Systematics

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