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Enkephalin and fear-motivated behavior

H Rigter, R A Jensen, J L Martinez

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1980
    PubMed
    Summary

    Enkephalins, including Leu[Enkephalin and its analog [DAla,DLeu]enkephalin, were found to suppress behavior in rats. These peptides may enhance fear or arousal, influencing avoidance learning.

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    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology

    Background:

    • Opioid peptides like enkephalins play roles in modulating pain and stress responses.
    • Understanding the behavioral effects of enkephalins is crucial for deciphering their central nervous system functions.

    Purpose of the Study:

    • To investigate the effects of Leu[Enkephalin and its analog [DAla,DLeu]enkephalin on learning and memory in rats.
    • To determine the mechanisms underlying enkephalin-induced behavioral changes.

    Main Methods:

    • Rats were administered Leu[Enkephalin and [DAla,DLeu]enkephalin intraperitoneally before training on aversively motivated tasks.
    • Behavioral responses, including active avoidance, inhibitory avoidance, and swim-escape, were assessed.
    • The influence of peptides on locomotor activity, pain perception, and light sensitivity was evaluated.

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    Main Results:

    • Enkephalins impaired the acquisition of a one-way active avoidance response.
    • Enkephalins facilitated the acquisition of an inhibitory avoidance response.
    • No significant effects were observed on the acquisition of a swim-escape response, suggesting specific modulation of avoidance learning rather than general motor or sensory deficits.

    Conclusions:

    • Enkephalins appear to strengthen behavioral suppression in response to aversive cues, potentially mediated by increased fear or arousal.
    • The observed effects at low doses and rapid onset suggest peripheral initiation of enkephalin actions.
    • These findings contribute to understanding the role of endogenous opioids in fear conditioning and behavioral regulation.