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Liu H, Li X, Li P, Hai R, Li J, Fan Q, Wang X, Chen Y, Cao X, Zhang X, Gao R, Wang K, Du C. Glutamatergic melanocortin-4 receptor neurons regulate body weight. FASEB J 2023; 37:e22920. [PMID: 37078546 DOI: 10.1096/fj.202201786r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 02/22/2023] [Accepted: 03/30/2023] [Indexed: 04/21/2023]
Abstract
The locus coeruleus (LC), enriched in vesicular glutamate transporter 2 (VGlut2) neurons, is a potential homeostasis-regulating hub. However, the identity of melanocortin-4 receptor (MC4R) neurons in the paraventricular nucleus (PVN) of the hypothalamus, PVNVGlut2::MC4R and LCVGlut2::MC4R regulation of body weight, and axonal projections of LCVGlut2 neurons remain unclear. Conditional knockout of MC4R in chimeric mice was used to confirm the effects of VGlut2. Interscapular brown adipose tissue was injected with pseudorabies virus to study the central nervous system projections. We mapped the LCVGlut2 circuitry. Based on the Cre-LoxP recombination system, specific knockdown of MC4R in VGlut2 neurons resulted in weight gain in chimeric mice. Adeno-associated virus-mediated knockdown of MC4R expression in the PVN and LC had potential superimposed effects on weight gain, demonstrating the importance of VGlut2 neurons. Unlike these wide-ranging efferent projections, the PVN, hypothalamic arcuate nucleus, supraoptic nucleus of the lateral olfactory tegmental nuclei, and nucleus tractus solitarius send excitatory projections to LCVGlut2 neurons. The PVN → LC glutamatergic MC4R long-term neural circuit positively affected weight management and could help treat obesity.
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Affiliation(s)
- Haodong Liu
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Xiaojing Li
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot, China
| | - Penghui Li
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Rihan Hai
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
- Vocational and Technical College, Inner Mongolia Agricultural University, Baotou, China
| | - Jiacheng Li
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Qi Fan
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Xing Wang
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Yujie Chen
- Vocational and Technical College, Inner Mongolia Agricultural University, Baotou, China
| | - Xiaojuan Cao
- Vocational and Technical College, Inner Mongolia Agricultural University, Baotou, China
| | - Xiaoyu Zhang
- Vocational and Technical College, Inner Mongolia Agricultural University, Baotou, China
| | - Ruifeng Gao
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Kun Wang
- Institute of Cereal and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, China
- Key Laboratory of Crop Cultivation Physiology and Green Production in Hebei Province, Shijiazhuang, China
| | - Chenguang Du
- Inner Mongolia Key Laboratory of Basic Veterinary Science, Hohhot, China
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
- Vocational and Technical College, Inner Mongolia Agricultural University, Baotou, China
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