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• W1960258372 abstract "Melanin-concentrating hormone (MCH) is a neuropeptide, identified by its ability to either mimic or antagonize the melanin-dispersing action of α-melanocyte stimulating hormone (αMSH) on skin melanophores. MCH and αMSH also have antagonistic actions in the brain affecting feeding behaviour, aggression, anxiety, arousal and reproductive function through the release of luteinizing hormone (LH). It is not clear, however, how they exert their opposite effects in the central nervous system (CNS). One possibility is that they act via a common receptor. In this study we have examined the effect of a number of MC receptor antagonists, with relative selectivity for the MC3, 4 and 5 subtypes, on the actions of MCH on LH release. We confirmed that bilateral administration of MCH (100 and 200 ng/side) into the medial preoptic area of oestrogen-primed (oestradiol benzoate 5 μg) ovariectomized anaesthetized rats, stimulated the release of LH. This effect was blocked by the concomitant administration into the medial preoptic area of the MC4/5 antagonist ([ d-Arg8]ACTH(4–10) and the MC3/5 antagonist ([Ala6]ACTH(4–10)—both at 500 ng/side—but not by the MC3/4 antagonist, SHU9119 (200 ng/side). Furthermore, the MC3 agonist [Nle3]-γ2 MSH failed to affect LH release. These results indicate that the MC3 and MC4 receptors are not involved in mediating the action of MCH but are consistent with an action via the MC5 subtype. Preputial glands, which express MC5 receptors, were also stimulated by MCH which is in keeping with this idea. In HEK293 cells transfected with the MC5 receptor MCH increased the production of IP3. However, it was much less potent than αMSH and unlike αMSH, had no effect on the production of cAMP. MCH (10−10 to 10−5 M) also failed to displace I125NDP-MSH from cells transfected with MC5 receptors indicating that it was not acting as a competitive antagonist and its binding site was distinct from that of αMSH. Thus while MCH may function as an agonist at the MC5 receptor, its stimulation of LH release is more likely to be mediated via a specific MCH receptor that has common properties with the MC5 receptor." @default.
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• W1960258372 date "2001-12-24" @default.
• W1960258372 modified "2023-09-24" @default.
• W1960258372 title "Melanin-Concentrating Hormone, Melanocortin Receptors and Regulation of Luteinizing Hormone Release" @default.
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• W1960258372 doi "https://doi.org/10.1046/j.1365-2826.2000.00440.x" @default.
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