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pubmed-article:8990120pubmed:abstractTextDominant alleles at the agouti locus (A) cause an obesity syndrome in the mouse, as a consequence of ectopic expression of the agouti peptide. This peptide, normally only found in the skin, is a high-affinity antagonist of the melanocyte-stimulating hormone receptor (MC1-R), thus explaining the inhibitory effect of agouti on eumelanin pigment synthesis. The agouti peptide is also an antagonist of the hypothalamic melanocortin-4 receptor (MC4-R). To test the hypothesis that agouti causes obesity by antagonism of hypothalamic melanocortin receptors, we identified cyclic melanocortin analogues that are potent agonists or antagonists of the neural MC3 (refs 11, 12) and MC4 receptors. Intracerebroventricular administration of the agonist, MTII, inhibited feeding in four models of hyperphagia: fasted C57BL/6J, ob/ob, and A(Y) mice, and mice injected with neuropeptide Y. Co-administration of the specific melanocortin antagonist and agouti-mimetic SHU9119 completely blocked this inhibition. Furthermore, administration of SHU9119 significantly enhanced nocturnal feeding, or feeding stimulated by a prior fast. Our data show that melanocortinergic neurons exert a tonic inhibition of feeding behaviour. Chronic disruption of this inhibitory signal is a likely explanation of the agouti obesity syndrome.lld:pubmed
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pubmed-article:8990120pubmed:articleTitleRole of melanocortinergic neurons in feeding and the agouti obesity syndrome.lld:pubmed
pubmed-article:8990120pubmed:affiliationThe Vollum Institute for Advanced Biomedical Research, Portland, Oregon 97201, USA.lld:pubmed
pubmed-article:8990120pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8990120pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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