Neuroanatomy of melanocortin-4 receptor pathway in the lateral hypothalamic area

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The central melanocortin system regulates body energy homeostasis including the melanocortin-4 receptor (MC4R). The lateral hypothalamic area (LHA) receives dense melanocortinergic inputs from the arcuate nucleus of the hypothalamus and regulates multiple processes including food intake, reward behaviors, and autonomic function. By using a mouse line in which green fluorescent protein (GFP) is expressed under control of the MC4R gene promoter, we systemically investigated MC4R signaling in the LHA by combining double immunohistochemistry, electrophysiology, and retrograde tracing techniques. We found that LHA MC4R-GFP neurons coexpress neurotensin as well as the leptin receptor but do not coexpress other peptide neurotransmitters found in the LHA including orexin, melanin-concentrating hormone, and nesfatin-1. Furthermore, electrophysiological recording demonstrated that leptin, but not the MC4R agonist melanotan II, hyperpolarizes the majority of LHA MC4R-GFP neurons in an ATP- sensitive potassium channeldependent manner. Retrograde tracing revealed that LHA MC4R-GFP neurons do not project to the ventral tegmental area, dorsal raphe nucleus, nucleus accumbens, and spinal cord, and only limited number of neurons project to the nucleus of the solitary tract and parabrachial nucleus. Our findings provide new insights into MC4R signaling in the LHA and its potential implications in homeostatic regulation of body energy balance. J. Comp. Neurol. 41684183, 2012. (c) 2012 Wiley Periodcicals, Inc.
Publisher
WILEY-BLACKWELL
Issue Date
2012-12
Language
English
Article Type
Article
Keywords

MELANOCYTE-STIMULATING HORMONE; MESOLIMBIC DOPAMINE SYSTEM; VENTRAL TEGMENTAL AREA; CENTRAL-NERVOUS-SYSTEM; FOOD-INTAKE; PARABRACHIAL NUCLEUS; PROOPIOMELANOCORTIN NEURONS; MESSENGER-RNA; MOUSE-BRAIN; PARAVENTRICULAR NUCLEUS

Citation

JOURNAL OF COMPARATIVE NEUROLOGY, v.520, no.18, pp.4168 - 4183

ISSN
0021-9967
DOI
10.1002/cne.23145
URI
http://hdl.handle.net/10203/201652
Appears in Collection
BS-Journal Papers(저널논문)
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