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Related Experiment Videos

Cimetidine and adrenals

G De Natale, M Vacca, P Preziosi

    Arzneimittel-Forschung
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Cimetidine, an H2-antagonist, lowers corticosterone in rats and blocks stress-induced increases. This effect is dose-dependent and lasts for 4 hours, suggesting potential pituitary or adrenal action.

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    Area of Science:

    • Endocrinology
    • Pharmacology
    • Neuroscience

    Background:

    • Corticosterone is a key stress hormone regulated by the hypothalamic-pituitary-adrenal (HPA) axis.
    • H2-antagonists are commonly used to reduce stomach acid production.
    • The impact of H2-antagonists on stress hormone regulation is not fully understood.

    Purpose of the Study:

    • To investigate the effect of cimetidine, an H2-antagonist, on plasma corticosterone levels in rats.
    • To determine if cimetidine antagonizes the increase in corticosterone induced by cold stress.
    • To explore the potential site of action for cimetidine's effects on adrenocortical secretion.

    Main Methods:

    • Administration of cimetidine to rats under normal and cold stress conditions.
    • Measurement of plasma corticosterone levels.

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  • Dose-response analysis of cimetidine's effects.
  • Evaluation of the duration of cimetidine's action.

    • Main Results:

    • Cimetidine significantly reduced basal plasma corticosterone levels in rats.
    • Cimetidine dose-dependently antagonized the increase in plasma corticosterone following cold stress.
    • The observed reduction in corticosterone by cimetidine persisted for approximately 4 hours.
    • The findings suggest a potential inhibitory effect of cimetidine on the HPA axis.

    Conclusions:

    • Cimetidine exhibits significant inhibitory effects on both normal and stress-induced corticosterone secretion in rats.
    • The dose-dependent nature and duration of action suggest a specific pharmacological interaction.
    • Further research is warranted to elucidate the precise hypophyseal or adrenal mechanisms underlying cimetidine's influence on adrenocortical function.