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Related Experiment Videos

Multiple hormonal control of pars intermedia cell activity.

H Meunier, F Labrie

    Canadian Journal of Biochemistry and Cell Biology = Revue Canadienne De Biochimie Et Biologie Cellulaire
    |July 1, 1983
    PubMed
    Summary

    Corticotropin-releasing factor (CRF) stimulates alpha-melanocyte-stimulating hormone (alpha-MSH) release from rat pars intermedia cells, acting via cyclic AMP (cAMP). This adds CRF as a key regulator alongside beta-adrenergic agents.

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    Area of Science:

    • Neuroendocrinology
    • Cellular Signaling

    Background:

    • Pars intermedia cells regulate alpha-melanocyte-stimulating hormone (alpha-MSH) secretion.
    • Secretion is modulated by beta-adrenergic stimulation and dopaminergic inhibition.

    Purpose of the Study:

    • To identify novel stimulatory substances for alpha-MSH secretion.
    • To elucidate the signaling pathways involved in pars intermedia cell regulation.

    Main Methods:

    • Measurement of alpha-MSH secretion and adenylate cyclase activity in rat pars intermedia cells.
    • Investigation of the roles of calcium ions, guanine nucleotides (GTP), and specific receptor agonists/antagonists.

    Main Results:

    • Corticotropin-releasing factor (CRF) was identified as a potent stimulator of alpha-MSH release.
    • CRF stimulates adenylate cyclase activity and cyclic AMP (cAMP) accumulation, similar to beta-adrenergic agonists.
    • Calcium ions are essential for both basal and CRF-induced alpha-MSH secretion; GTP potentiates receptor-mediated effects.

    Conclusions:

    • CRF is a significant stimulator of pars intermedia cell activity, acting through a cAMP-mediated pathway.
    • Both beta-adrenergic and CRF receptors, along with the dopamine receptor, converge on adenylate cyclase activity.
    • Receptor sensitivity and interactions fine-tune pars intermedia cell activity.

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