Leptin-inhibited PBN neurons enhance responses to hypoglycemia in negative energy balance.

Leptin-inhibited PBN neurons enhance responses to hypoglycemia in negative energy balance.
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DOI:
10.1038/nn.3861
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发表时间:
2014-12
影响因子:
25
通讯作者:
Myers, Martin G., Jr.
Myers, Martin G., Jr.
中科院分区:
医学1区
文献类型:
--
作者:
Flak, Jonathan N.;Patterson, Christa M.;Garfield, Alastair S.;D'Agostino, Giuseppe;Goforth, Paulette B.;Sutton, Amy K.;Malec, Paige A.;Wong, Jenny-Marie T.;Germani, Mark;Jones, Justin C.;Rajala, Michael;Satin, Leslie;Rhodes, Christopher J.;Olson, David P.;Kennedy, Robert T.;Heisler, Lora K.;Myers, Martin G., Jr.

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低血糖启动反调节反应(CRR),其中交感神经系统、胰高血糖素和糖皮质激素将葡萄糖恢复到适当的浓度。在饥饿期间,低瘦素抑制能量利用,提高长期生存。为了确保禁食动物在低血糖期间的短期存活,CRR必须克服这种能量节省计划和营养消耗。在这里,我们确定在小鼠中以前未被认识到的作用瘦素和瘦素调节的神经元,调节CRR,以满足这些挑战。低氧激活臂旁核(PBN)的瘦素受体(LepRb)和胆囊收缩素(CCK)表达神经元,这些神经元投射到下丘脑腹内侧核。瘦素抑制这些细胞,并且Cckcre介导的LepRb消融增强CRR。抑制PBN LepRb细胞使CRR钝化,而它们的活化以CCK依赖性方式模拟CRR。PBN LepRbCCK神经元代表CRR系统的重要组成部分,并可能代表低血糖症的治疗靶点。
Hypoglycemia initiates the counter regulatory response (CRR), in which the sympathetic nervous system, glucagon, and glucocorticoids restore glucose to appropriate concentrations. During starvation, low leptin restrains energy utilization, enhancing long-term survival. To ensure short-term survival during hypoglycemia in fasted animals, the CRR must overcome this energy-sparing program and nutrient depletion. Here, we identify in mice a previously unrecognized role for leptin and a population of leptin-regulated neurons that modulate the CRR to meet these challenges. Hypoglycemia activates leptin receptor (LepRb) and cholecystokinin (CCK)-expressing neurons of the parabrachial nucleus (PBN), which project to the ventromedial hypothalamic nucleus. Leptin inhibits these cells and Cckcre-mediated ablation of LepRb enhances the CRR. Inhibition of PBN LepRb cells blunts the CRR, while their activation mimics the CRR in a CCK-dependent manner. PBN LepRbCCK neurons represent a crucial component of the CRR system, and may represent a therapeutic target in hypoglycemia.
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