Deletion of Nampt in Projection Neurons of Adult Mice Leads to Motor Dysfunction, Neurodegeneration, and Death.

Deletion of Nampt in Projection Neurons of Adult Mice Leads to Motor Dysfunction, Neurodegeneration, and Death.
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DOI:
10.1016/j.celrep.2017.08.022
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发表时间:
2017-08-29
期刊:
影响因子:
8.8
通讯作者:
Ding S
Ding S
中科院分区:
生物学1区
文献类型:
--
作者:
Wang X;Zhang Q;Bao R;Zhang N;Wang Y;Polo-Parada L;Tarim A;Alemifar A;Han X;Wilkins HM;Swerdlow RH;Wang X;Ding S

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细胞内烟酰胺磷酸贝糖基转移酶(INAMPT)是哺乳动物NAD+生物合成途径的限速酶。使用诱导和条件敲除(CKO)小鼠,我们表明成人投射神经元中的NAMPT基因缺失会导致体重,低温,运动神经元(MN)变性,运动功能缺陷,瘫痪和死亡的逐渐减少。 NAMPT删除会导致线粒体功能障碍,肌肉纤维类型转化和萎缩以及神经肌肉连接(NMJS)的突触功能有缺陷。当用烟酰胺单核苷酸(NMN)处理时,NAMPT CKO小鼠表现出降低的运动功能缺陷和寿命延长。在肌萎缩性侧索硬化症(ALS)患者的脊髓中,INAMPT蛋白水平显着降低,表明NAMPT参与ALS病理学。我们的发现表明,神经元NAMPT在线粒体生物能,运动功能和生存中起着至关重要的作用。我们的研究表明,NAMPT介导的NAD+生物合成途径是退行性MN疾病的潜在治疗靶标。 Wang等。发现投射神经元NAMPT对于成年小鼠的线粒体生物能,运动功能和存活至关重要,并且ALS患者的INMPT降低了。 NMN改善了健康,并延长了NAMPT敲除小鼠的寿命。他们的发现表明了运动神经元退化性疾病的治疗途径。
Intracellular nicotinamide phosphoribosyltransferase (iNAMPT) is the rate-limiting enzyme of the mammalian NAD+ biosynthesis salvage pathway. Using inducible and conditional knockout (cKO) mice, we show that Nampt gene deletion in adult projection neurons leads to a progressive loss of body weight, hypothermia, motor neuron (MN) degeneration, motor function deficits, paralysis, and death. Nampt deletion causes mitochondrial dysfunction, muscle fiber type conversion, and atrophy, as well as defective synaptic function at neuromuscular junctions (NMJs). When treated with nicotinamide mononucleotide (NMN), Nampt cKO mice exhibit reduced motor function deficits and prolonged lifespan. iNAMPT protein levels are significantly reduced in the spinal cord of amyotrophic lateral sclerosis (ALS) patients, indicating the involvement of NAMPT in ALS pathology. Our findings reveal that neuronal NAMPT plays an essential role in mitochondrial bioenergetics, motor function, and survival. Our study suggests that the NAMPT-mediated NAD+ biosynthesis pathway is a potential therapeutic target for degenerative MN diseases. Wang et al. find that projection neuron NAMPT is essential for mitochondrial bioenergetics, motor function, and survival of adult mice and that iNAMPT is reduced in ALS patients. NMN improves health and extends the lifespan of Nampt knockout mice. Their findings suggest therapeutic avenues for motor neuron degenerative diseases.
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