Kir4.1-Dependent Astrocyte-Fast Motor Neuron Interactions Are Required for Peak Strength.
Kir4.1-Dependent Astrocyte-Fast Motor Neuron Interactions Are Required for Peak Strength.
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DOI:
10.1016/j.neuron.2018.03.010
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发表时间:
2018-04-18
期刊:
影响因子:
16.2
通讯作者:
Rowitch DH
中科院分区:
文献类型:
--
作者:
Kelley KW;Ben Haim L;Schirmer L;Tyzack GE;Tolman M;Miller JG;Tsai HH;Chang SM;Molofsky AV;Yang Y;Patani R;Lakatos A;Ullian EM;Rowitch DH
Diversified neurons are essential for sensorimotor function, but whether astrocytes become specialized to optimize circuit performance remains unclear. Large fast α-motor neurons (FαMNs) of spinal cord innervate fast-twitch muscles that generate peak strength. We report that ventral horn astrocytes express the inward-rectifying K+ channel Kir4.1 (a.k.a. Kcnj10) around MNs in a VGLUT1-dependent manner. Loss of astrocyte-encoded Kir4.1 selectively altered FαMN size and function and led to reduced peak strength. Overexpression of Kir4.1 in astrocytes was sufficient to increase MN size through activation of the PI3K/mTOR/pS6 pathway. Kir4.1 was downregulated cell autonomously in astrocytes derived from amyotrophic lateral sclerosis (ALS) patients with SOD1 mutation. However, astrocyte Kir4.1 was dispensable for FαMN survival even in the mutant SOD1 background. These findings show that astrocyte Kir4.1 is essential for maintenance of peak strength and suggest that Kir4.1 downregulation might uncouple symptoms of muscle weakness from MN cell death in diseases like ALS. Kir4.1 is upregulated in astrocytes around high-activity alpha motor neurons (MNs) Astrocyte Kir4.1 KO caused decreased peak strength without alpha MN loss ALS patient-derived astrocytes show cell-autonomous Kir4.1 downregulation Astrocyte Kir4.1 regulates MN size through PI3K/mTOR/pS6 activation Kelley et al. show that specialized astrocytes surrounding spinal cord fast α-motor neurons are critical to generate peak strength and that they are compromised by mutations in models of amyotrophic lateral sclerosis.
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影响因子:
5.3
作者:
Djukic, Biljana;Casper, Kristen B.;McCarthy, Ken D.
通讯作者:
McCarthy, Ken D.
DOI:
10.1093/bioinformatics/btu638
发表时间:
2015-01-15
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
Anders S;Pyl PT;Huber W
通讯作者:
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影响因子:
56.9
作者:
Fremeau, RT;Kam, K;Edwards, RH
通讯作者:
Edwards, RH
DOI:
10.1073/pnas.1419497111
发表时间:
2014-11-25
影响因子:
11.1
作者:
Hadzipasic, Muhamed;Tahvildari, Babak;McCormick, David A.
通讯作者:
McCormick, David A.
影响因子:
16.2
作者:
Freeman MR;Rowitch DH
通讯作者:
Rowitch DH