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[Hypothalamic control of ACTH secretion].

C Oliver, B Conte-Devolx, P Giraud

    Hormone Research
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Hypothalamic regulation of ACTH secretion involves corticotropin-releasing factor (CRF) in various forms. Vasopressin shows CRF-like activity, and glucocorticoids inhibit ACTH release at multiple levels.

    Area of Science:

    • Neuroendocrinology
    • Hormone Regulation

    Background:

    • Hypothalamic control of ACTH secretion is complex.
    • Corticotropin-releasing factor (CRF) is a key regulator.
    • The precise molecular forms and physiological roles of CRF and vasopressin are under investigation.

    Purpose of the Study:

    • To review the hypothalamic regulation of ACTH secretion.
    • To discuss recent findings on CRF molecular forms and vasopressin's role.
    • To examine the influence of neurotransmitters and glucocorticoids on ACTH release.

    Main Methods:

    • Review of existing biochemical and physiological investigations.
    • Analysis of studies on CRF synthesis and transport.
    • Examination of data on monoamine and glucocorticoid effects on ACTH secretion.

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    Main Results:

    • CRF exists in multiple molecular weight forms in the hypothalamus, with structures yet to be fully elucidated.
    • Vasopressin exhibits CRF-like activity, but its physiological role as a CRF is debated.
    • CRF synthesis occurs widely in the hypothalamus, with projections to the hypophysial portal system.
    • Monoamine receptor stimulation (nicotinic, muscarinic) increases ACTH secretion, while alpha-adrenergic receptors may inhibit it (species-dependent).
    • Glucocorticoids reduce ACTH secretion via hypothalamic and pituitary actions.

    Conclusions:

    • Hypothalamic regulation of ACTH secretion is multifaceted, involving CRF, vasopressin, neurotransmitters, and glucocorticoids.
    • Further research is needed to clarify CRF structures and vasopressin's exact physiological function.
    • Glucocorticoid feedback provides a crucial regulatory mechanism for ACTH release.