医学
内科学
中缝背核
肥胖
内分泌学
下丘脑
原肌球蛋白受体激酶B
神经营养因子
受体
血清素
5-羟色胺能
作者
Yuan Li,Min‐Hyun Kim,Lin Jiang,Lee Ann Fisher Baron,Latrice D. Faulkner,David P. Olson,Xingyu Li,Noam Gannot,Peng Li,Liangyou Rui
标识
DOI:10.1002/advs.202400437
摘要
Abstract SH2B1 mutations are associated with obesity, type 2 diabetes, and metabolic dysfunction‐associated steatotic liver disease (MASLD) in humans. Global deletion of Sh2b1 results in severe obesity, type 2 diabetes, and MASLD in mice. Neuron‐specific restoration of SH2B1 rescues the obesity phenotype of Sh2b1‐null mice, indicating that the brain is a main SH2B1 target. However, SH2B1 neurocircuits remain elusive. SH2B1‐expressing neurons in the paraventricular hypothalamus (PVH SH2B1 ) and a PVH SH2B1 →dorsal raphe nucleus (DRN) neurocircuit are identified here. PVH SH2B1 axons monosynaptically innervate DRN neurons. Optogenetic stimulation of PVH SH2B1 axonal fibers in the DRN suppresses food intake. Chronic inhibition of PVH SH2B1 neurons causes obesity. In male and female mice, either embryonic‐onset or adult‐onset deletion of Sh2b1 in PVH neurons causes energy imbalance, obesity, insulin resistance, glucose intolerance, and MASLD. Ablation of Sh2b1 in the DRN‐projecting PVH SH2B1 subpopulation also causes energy imbalance, obesity, and metabolic disorders. Conversely, SH2B1 overexpression in either total or DRN‐projecting PVH SH2B1 neurons protects against diet‐induced obesity. SH2B1 binds to TrkB and enhances brain‐derived neurotrophic factor (BDNF) signaling. Ablation of Sh2b1 in PVH SH2B1 neurons induces BDNF resistance in the PVH, contributing to obesity. In conclusion, these results unveil a previously unrecognized PVH SH2B1 →DRN neurocircuit through which SH2B1 defends against obesity by enhancing BDNF/TrkB signaling.
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