Abstract
Melanin concentrating hormone (MCH) is an orexigenic peptide secreted from the lateral hypothalamus. Various observations suggest a role for MCH in energy expenditure in transgenic mice; however, the influence of MCH on energy expenditure and body temperature in WT mice was inadequately studied. Therefore, our first goal was to characterize the influence of chronic intracerebroventrical MCH infusion on energy homeostasis in mice. Our second goal was to explore the effect of MCH on the GH–insulin like growth factor 1 (IGF-1) axis in vivo. We have recently published that MCH directly increased GH-secretion from pituitary cells in vitro, suggesting that MCH may exert part of its effects on energy balance via direct pituitary hormone regulation. Mice were centrally infused with MCH for 14 days, resulting in a significant increase in food intake, body weight, fat mass and plasma IGF-1 levels, while decreasing body temperature and energy expenditure. Our data emphasize the role of MCH as a key regulator of energy homeostasis by means of appetite regulation, regulation of energy expenditure, and an integrator of energy balance with the neuroendocrine system regulating pituitary hormone secretion. They also support the notion that MCH may have a physiologic role in GH regulation that may, in turn, contribute to its effect on body weight.
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Acknowledgments
We thank Dr. Hadara Rubinfeld for her generous assistance. This study was supported by a grant from the United States-Israel Binational Science Foundation, Jerusalem, Israel, to G. Segal-Lieberman (Grant no. 2001160).
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Glick, M., Segal-Lieberman, G., Cohen, R. et al. Chronic MCH infusion causes a decrease in energy expenditure and body temperature, and an increase in serum IGF-1 levels in mice. Endocr 36, 479–485 (2009). https://doi.org/10.1007/s12020-009-9252-5
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DOI: https://doi.org/10.1007/s12020-009-9252-5