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Endorphins do not affect behavioral stress responses in mice.

A Katoh¹, T Nabeshima, R Ukai

¹Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Meijo University, Nagoya, Japan.

|July 1, 1992

Summary

Endorphins do not influence behavioral stress responses in mice. Unlike enkephalins and dynorphin, endorphins (alpha, beta, gamma) showed no effect on motility suppression or immobility during stress tests.

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Area of Science:

Neuroscience
Behavioral Science
Pharmacology

Background:

Endorphins are endogenous opioid peptides with known roles in pain and mood.
Previous research indicated that enkephalins attenuate stress responses, while dynorphin potentiates them.

Purpose of the Study:

To investigate the effects of specific endorphins on behavioral stress responses in a mouse model.
To compare the role of endorphins with that of enkephalins and dynorphin in stress.

Main Methods:

Mice were subjected to environment-induced conditioned suppression of motility and forced swimming-induced immobility tests.
Cerebral ventricular administration of alpha-endorphin, beta-endorphin, and gamma-endorphin at varying dosages.
Behavioral responses were quantified by measuring motility suppression and immobility duration.

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Main Results:

Administration of alpha-endorphin, beta-endorphin, or gamma-endorphin did not alter environment-induced conditioned suppression of motility.
These endorphins also failed to affect forced swimming-induced immobility.
The findings contrast with the known effects of enkephalins and dynorphin on these stress behaviors.

Conclusions:

Endorphinergic systems are not responsible for mediating the observed behavioral stress responses in mice.
The role of endorphins in stressful situations may differ significantly from that of enkephalins and dynorphins.
Further research is needed to elucidate the specific functions of different endogenous opioid systems in stress.