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GABAergic modulation of learned helplessness.

F Petty, A D Sherman

    Pharmacology, Biochemistry, and Behavior
    |October 1, 1981
    PubMed
    Summary

    Learned helplessness (LeH) in animals shows reduced GABA release and increased glutamate in the hippocampus. Antidepressant treatments targeting GABAergic systems may reverse LeH, suggesting GABA

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    Area of Science:

    • Neuroscience
    • Neurobiology
    • Psychopharmacology

    Background:

    • The GABAergic system in the hippocampus is crucial for antidepressant-induced reversal of learned helplessness (LeH).
    • Previous research indicates a significant role for hippocampal GABAergic function in mood regulation and antidepressant efficacy.

    Purpose of the Study:

    • To investigate the specific alterations in GABA and glutamate release in the hippocampus during learned helplessness.
    • To examine the effects of specific pharmacological agents on GABAergic function and the behavioral state of learned helplessness.

    Main Methods:

    • Induction of learned helplessness (LeH) in animal models via uncontrollable electric shock.
    • Measurement of depolarization-induced release of GABA and glutamate from the hippocampus.
    • Intrahippocampal injections of bicuculline and glutamate.
    • Assessment of GABA flux through the small hippocampal pool following chronic antidepressant treatment.

    Main Results:

    • Animals with LeH exhibited decreased GABA release and increased hippocampal glutamate release compared to controls.
    • Hippocampal bicuculline injection mimicked the behavioral state of LeH without affecting pain sensitivity.
    • Chronic treatment with imipramine and iprindole, but not lorazepam or chlorpromazine, elevated GABA flux in the hippocampus.

    Conclusions:

    • These findings reinforce the critical role of the GABAergic system in the hippocampus for the learned helplessness model of depression.
    • Targeting hippocampal GABAergic pathways with specific antidepressants may be a viable therapeutic strategy for depression.

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