Abstract
It has been suggested that melanin concentrating hormone (MCH) possesses potent corticotrophin (ACTH) inhibitory activity, on the basis of the inhibitory effects displayed by salmon MCH on ACTH release from either trout or rat isolated pituitary fragments. Recently, rat MCH has been characterised, and this prompted us to investigate the putative inhibitory activity of synthetic rat MCH on basal and stimulated ACTH secretion from freshly-dispersed rat pituitary cells or incubated rat pituitary fragments, as well on KCl (28 mmol/l) or noradrenaline-evoked release of corticotrophin releasing hormone-41 (CRH-41) from rat hypothalamic explants in vitro. There were no effects of rat MCH on either CRH-41 or ACTH release in vitro.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adrenocorticotropic Hormone / metabolism*
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Animals
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Corticotropin-Releasing Hormone / metabolism*
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Corticotropin-Releasing Hormone / pharmacology
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Dose-Response Relationship, Drug
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Hypothalamic Hormones*
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Hypothalamo-Hypophyseal System / drug effects*
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Hypothalamo-Hypophyseal System / metabolism
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In Vitro Techniques
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Male
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Melanins / pharmacology*
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Pituitary Gland, Anterior / drug effects*
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Pituitary Gland, Anterior / metabolism
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Pituitary Hormones / pharmacology*
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Pituitary-Adrenal System / drug effects*
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Pituitary-Adrenal System / metabolism
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Rats
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Rats, Inbred Strains
Substances
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Hypothalamic Hormones
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Melanins
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Pituitary Hormones
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melanin-concentrating hormone
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Adrenocorticotropic Hormone
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Corticotropin-Releasing Hormone