A Leptin-Mediated Neural Mechanism Linking Breathing to Metabolism.

A Leptin-Mediated Neural Mechanism Linking Breathing to Metabolism.
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DOI:
10.1016/j.celrep.2020.108358
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发表时间:
2020-11-10
期刊:
影响因子:
8.8
通讯作者:
Martina M
Martina M
中科院分区:
生物学1区
文献类型:
--
作者:
Do J;Chang Z;Sekerková G;McCrimmon DR;Martina M

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Breathing is coupled to metabolism. Leptin, a peptide mainly secreted in proportion to adipose tissue mass, increases energy expenditure with a parallel increase in breathing. We demonstrate that optogenetic activation of LepRb neurons in the nucleus of the solitary tract (NTS) mimics the respiratory stimulation after systemic leptin administration. We show that leptin activates the sodium leak channel (NALCN), thereby depolarizing a subset of glutamatergic (VGluT2) LepRb NTS neurons expressing galanin. Mice with selective deletion of NALCN in LepRb neurons have increased breathing irregularity and central apneas. On a high-fat diet, these mice gain weight with an associated depression of minute ventilation and tidal volume, which are not detected in control littermates. Anatomical mapping reveals LepRb NTS-originating glutamatergic axon terminals in a brainstem inspiratory premotor region (rVRG) and dorsomedial hypothalamus. These findings directly link a defined subset of NTS LepRb cells to the matching of ventilation to energy balance. Do et al. identify an NTS-based, leptin-dependent neural circuit that stimulates breathing, matching ventilation to energy consumption. Leptin selectively depolarizes galanin-expressing LepRb NTS neurons through activation of NALCN. Activation of this pathway is required to increase tidal volume in overweight conditions.
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