Ablation of LMO4 in glutamatergic neurons impairs leptin control of fat metabolism.

Ablation of LMO4 in glutamatergic neurons impairs leptin control of fat metabolism.
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DOI:
10.1007/s00018-011-0794-3
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发表时间:
2012-03
影响因子:
8
通讯作者:
Chen, Hsiao-Huei
Chen, Hsiao-Huei
中科院分区:
生物学1区
文献类型:
--
作者:
Zhou, Xun;Gomez-Smith, Mariana;Qin, Zhaohong;Duquette, Philippe M.;Cardenas-Blanco, Arturo;Rai, Punarpreet S.;Harper, Mary-Ellen;Tsai, Eve C.;Anisman, Hymie;Chen, Hsiao-Huei

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LIM domain only 4(LMO 4)蛋白在下丘脑中表达,但其功能尚不清楚。使用LMO 4在出生后丘脑能神经元中消融的小鼠,包括LMO 4表达的室旁核(PVN)和腹内侧核(VMH)的大多数神经元,我们询问LMO 4是否是代谢稳态所需的。LMO 4突变小鼠表现出早发性肥胖。这些小鼠具有减少的能量消耗和受损的产热以及减少的交感神经流出到脂肪组织。由脂肪细胞产生的肽激素瘦素激活下丘脑的Jak/Stat 3信号传导以控制食物摄入、能量消耗和脂肪代谢。LMO 4突变小鼠和对照小鼠侧脑室注射瘦素抑制摄食的作用相似。然而,在这些小鼠中,瘦素诱导的脂肪减少受损,VMH中Stat 3的激活减弱。因此,我们的研究确定LMO 4作为选择性下丘脑核团中的瘦素功能的新调节剂来调节脂肪代谢。
The LIM domain only 4 (LMO4) protein is expressed in the hypothalamus, but its function there is not known. Using mice with LMO4 ablated in postnatal glutamatergic neurons, including most neurons of the paraventricular (PVN) and ventromedial (VMH) hypothalamic nuclei where LMO4 is expressed, we asked whether LMO4 is required for metabolic homeostasis. LMO4 mutant mice exhibited early onset adiposity. These mice had reduced energy expenditure and impaired thermogenesis together with reduced sympathetic outflow to adipose tissues. The peptide hormone leptin, produced from adipocytes, activates Jak/Stat3 signaling at the hypothalamus to control food intake, energy expenditure, and fat metabolism. Intracerebroventricular infusion of leptin suppressed feeding similarly in LMO4 mutant and control mice. However, leptin-induced fat loss was impaired and activation of Stat3 in the VMH was blunted in these mice. Thus, our study identifies LMO4 as a novel modulator of leptin function in selective hypothalamic nuclei to regulate fat metabolism.
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