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
中科院分区:
文献类型:
--
作者:
Krysciak, Katarzyna;Grieb, Pawel;Celichowski, Jan
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.