CHANGES IN MOTOR UNIT PROPERTIES IN SOD1 (G93A) RATS

CHANGES IN MOTOR UNIT PROPERTIES IN SOD1 (G93A) RATS
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DOI:
10.1002/mus.24196
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发表时间:
2014-10-01
期刊:
影响因子:
3.4
通讯作者:
Celichowski, Jan
Celichowski, Jan
中科院分区:
医学3区
文献类型:
--
作者:
Krysciak, Katarzyna;Grieb, Pawel;Celichowski, Jan

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简介:在肌萎缩侧索硬化症 (ALS) 中,运动神经元的进行性死亡导致肌肉去神经支配和神经支配重新支配。目前尚不清楚 ALS 如何影响运动单位 (MU) 的特性。方法:在携带人类突变超氧化物歧化酶基因 1(SOD1)的大鼠的内侧腓肠肌(MG)中的单个 MU 的特性在 3 个阶段进行测定:无症状(ALS I);无症状(ALS I);早期症状(ALS II);和终端(ALS III)。结果:在 ALS II 中,观察到较高比例的 FF(快疲劳)和 S(慢)MU,而在 ALS III 中,与对照组相比,观察到较高比例的 S 百分比和较低比例的 FF MU。 S 运动神经元重新支配快肌纤维,这些 MU 获得了快肌纤维的一些特性,包括较低的抗疲劳性、更大的力产生和更高的动作电位幅度。结论:SOD1大鼠MU特性的变化具有渐进性和多向性特征,其速度取决于MU类型。
Introduction: In amyotrophic lateral sclerosis (ALS), progressive death of motor neurons results in denervation and reinnervation of muscles. It is not clear how ALS affects the properties of motor units (MUs). Methods: Properties of single MUs in the medial gastrocnemius (MG) muscle of rats bearing the human mutated superoxide dismutase gene type 1 (SOD1) were determined at 3 stages: asymptomatic (ALS I); early symptomatic (ALS II); and terminal (ALS III). Results: In ALS II, higher proportions of FF (fast fatigable) and S (slow) MUs were observed, whereas in ALS III higher percentages of S and lower percentages of FF MUs were noted compared with controls. S motor neurons reinnervated fast muscle fibers, and those MUs gained some properties of fast MUs, including lower fatigue resistance, greater force generation, and higher action potential amplitudes. Conclusion: Changes in MU properties of SOD1 rats have progressive and multidirectional character and speed depending on the MU type.