Hypothalamic tanycytes are an ERK-gated conduit for leptin into the brain.

Hypothalamic tanycytes are an ERK-gated conduit for leptin into the brain.
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DOI:
10.1016/j.cmet.2013.12.015
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发表时间:
2014-02-04
期刊:
影响因子:
29
通讯作者:
Prévot V
Prévot V
中科院分区:
生物学1区
文献类型:
--
作者:
Balland E;Dam J;Langlet F;Caron E;Steculorum S;Messina A;Rasika S;Falluel-Morel A;Anouar Y;Dehouck B;Trinquet E;Jockers R;Bouret SG;Prévot V

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脂肪细胞分泌的瘦素通过调节下丘脑内侧基底区(MBH)的神经元活动作用于大脑,减少摄食量。肥胖与对高循环瘦素水平的抵抗有关。在这里,我们证明了外周给药的瘦素激活了正中隆起张力细胞和MBH神经元中的瘦素受体(Lepr),这一过程需要紧张性细胞ERK信号和瘦素通过脑脊液。在缺乏信号转导LepRb亚型的小鼠或饮食诱导肥胖的小鼠中,张力细胞摄取的瘦素在正中隆起积聚,无法达到MBH。在肥胖动物体内,通过EGF激活ERK信号重建瘦素转运,诱导MBH神经元激活和能量消耗,并加速恢复正常脂肪饮食的瘦素敏感性。因此,依赖ERK的瘦素转运在瘦素抵抗的病理生理过程中可能发挥关键作用,并具有治疗肥胖症的潜力。
Leptin secreted by adipocytes acts on the brain to reduce food intake by regulating neuronal activity in the mediobasal hypothalamus (MBH). Obesity is associated with resistance to high circulating leptin levels. Here, we demonstrate that peripherally administered leptin activates its receptor (LepR) in median eminence tanycytes followed by MBH neurons, a process requiring tanycytic ERK signaling and the passage of leptin through the cerebrospinal fluid. In mice lacking the signal-transducing LepRb isoform or with diet-induced obesity, leptin taken up by tanycytes accumulates in the median eminence and fails to reach the MBH. Triggering ERK signaling in tanycytes with EGF reestablishes leptin transport, elicits MBH neuron activation and energy expenditure in obese animals, and accelerates the restoration of leptin sensitivity upon the return to a normal-fat diet. ERK-dependent leptin transport by tanycytes could thus play a critical role in the pathophysiology of leptin resistance, and holds therapeutic potential for treating obesity.
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