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Endocrinology Vol. 143, No. 7 2469-2477
Copyright © 2002 by The Endocrine Society

RECEPTORS

Targeted Disruption of the Melanin-Concentrating Hormone Receptor-1 Results in Hyperphagia and Resistance to Diet-Induced Obesity

Yanyun Chen, Changzhi Hu, Chiun-Kang Hsu, Qing Zhang, Chen Bi, Mark Asnicar, Hansen M. Hsiung, Niles Fox, Lawrence J. Slieker, Derek D. Yang, Mark L. Heiman and Yuguang Shi

Division of Endocrinology (Y.C., C.H., C.-K.H., C.B., M.A., H.M.H., L.J.S., M.L.H., Y.S.), Division of Bio-Research Technologies and Proteins (Q.Z., N.F., D.D.Y.), Lilly Research Laboratories, Eli Lilly \|[amp ]\|Co., Indianapolis, Indiana 46285

Address all correspondence and requests for reprints to: Dr. Yuguang Shi, Lilly Research Laboratories, Endocrine Division, Lilly Corporate Center, DC 0545, Eli Lilly \|[amp ]\|Co., Indianapolis, Indiana 46285. E-mail: . shi_yuguang{at}lilly.com

The hypothalamic neuropeptide melanin-concentrating hormone (MCH) has been implicated in a variety of physiological functions including the regulation of feeding and energy homeostasis. Two MCH receptors (MCHR1 and MCHR2) have been identified so far. To decipher the functional role of the MCH receptors, we have generated and phenotypically characterized mice rendered deficient in MCHR1 expression by homologous recombination. Inactivation of MCHR1 results in mice (MCHR1-/-) that are resistant to diet-induced obesity. With a high-fat diet, body fat mass is significantly lower in both male (4.7 ± 0.6 g vs. 9.6 ± 1.2 g) and female (3.9 ± 0.2 vs. 5.8 ± 0.5 g) MCHR1-/- mice than that of the wild-type control (P < 0.01), but the lean mass remains constant. When normalized to body weight, female mice are hyperphagic, and male mice are hyperphagic and hypermetabolic, compared with wild-type mice. Consistent with the lower fat mass, both leptin and insulin levels are significantly lower in male MCHR1-/- mice than in the wild-type controls. Our data firmly establish MCHR1 as a mediator of MCH effects on energy homeostasis and suggest that inactivation of MCHR1 alone is capable to counterbalance obesity induced by a high-fat diet.




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