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Alterations in brain monoaminergic functioning associated with septal lesion induced hyperreactivity.

B K Bernard, J R Berchek, D A Yutzey

    Pharmacology, Biochemistry, and Behavior
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Bilateral septal lesions in rats increased reactivity to handling, accompanied by reduced hypothalamic norepinephrine and dopamine. This suggests a role for catecholamines in affective behavior, but not altered monoamine dynamics.

    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Neurochemistry

    Background:

    • Affective behaviors are complex and influenced by various neurochemical systems.
    • The septal area of the brain plays a role in regulating emotional and behavioral responses.
    • Monoamines, including norepinephrine and dopamine, are implicated in mood and reactivity.

    Purpose of the Study:

    • To investigate the effects of bilateral septal lesions on animal reactivity and brain monoamine levels.
    • To examine the relationship between septal lesions, affective behavior, and catecholamine dynamics.

    Main Methods:

    • Thirty male albino rats underwent behavioral testing for handling reactivity.
    • Bilateral septal lesions or sham operations were performed.
    • Postoperatively, monoamine levels (norepinephrine, dopamine, serotonin) and their metabolites were measured in various brain regions using fluorometry.

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  • Catecholamine dynamics (rate constants, turnover times, utilization rates) were assessed.

    • Main Results:

    • Septal-lesioned rats exhibited significantly increased reactivity to handling compared to controls.
    • Reduced norepinephrine and dopamine levels were observed in the hypothalamus of lesioned rats, along with decreased dopamine in the limbic system.
    • Serotonin levels and catecholamine dynamics remained largely unaffected by the lesions.
    • The ratio of norepinephrine to serotonin in the limbic system was significantly reduced in lesioned animals.

    Conclusions:

    • Septal lesions alter affective behavior and specific catecholamine levels in the brain.
    • These findings support the involvement of catecholamines in affective behaviors.
    • The study did not find evidence of altered functional dynamics of brain monoamines in relation to the induced hyperreactivity.