Motor transmission defects with sex differences in a new mouse model of mild spinal muscular atrophy

被引:20
作者
Deguise, Marc-Olivier [1 ,2 ,3 ]
De Repentigny, Yves [1 ]
Tierney, Alexandra [1 ]
Beauvais, Ariane [1 ]
Michaud, Jean [4 ]
Chehade, Lucia [1 ,2 ,3 ]
Thabet, Mohamed [2 ]
Paul, Brittany [1 ,3 ]
Reilly, Aoife [1 ,2 ,3 ]
Gagnon, Sabrina [1 ]
Renaud, Jean-Marc [2 ,3 ]
Kothary, Rashmi [1 ,2 ,3 ,5 ,6 ]
机构
[1] Ottawa Hosp, Regenerat Med Program, Res Inst, 501 Smyth Rd, Ottawa, ON K1H 8L6, Canada
[2] Univ Ottawa, Dept Cellular & Mol Med, Ottawa, ON K1H 8M5, Canada
[3] Univ Ottawa, Ctr Neuromuscular Dis, Ottawa, ON K1H 8M5, Canada
[4] Univ Ottawa, Fac Med, Dept Pathol & Lab Med, Ottawa, ON K1H 8M5, Canada
[5] Univ Ottawa, Fac Med, Dept Biochem Microbiol & Immunol, Ottawa, ON K1H 8M5, Canada
[6] Univ Ottawa, Dept Med, Ottawa, ON K1H 8M5, Canada
基金
加拿大健康研究院;
关键词
Aging; SMN; Type IV; Electrophysiology; Sex difference; Non-neuronal defects; FATTY-ACID-METABOLISM; SMN GENE; NEURON DEGENERATION; MISSENSE MUTATION; CARDIAC DEFECTS; SURVIVAL; DISEASE; ONSET; MICE; PROTEIN;
D O I
10.1016/j.ebiom.2020.102750
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background: Mouse models of mild spinal muscular atrophy (SMA) have been extremely challenging to generate. This paucity of model systems has limited our understanding of pathophysiological events in milder forms of the disease and of the effect of SMN depletion during aging. Methods: A mild mouse model of SMA, termed Smn(2B/-);SMN2(+/-), was generated by crossing Smn(-/-);SMN2 and Smn(2B/2B) mice. This new model was characterized using behavioral testing, histology, western blot, muscle-nerve electrophysiology as well as ultrasonography to study classical SMA features and extra-neuronal involvement. Findings: Smn(2B/-);SMN2(+/-) mice have normal survival, mild but sustained motor weakness, denervation and neuronal/neuromuscular junction (NMJ) transmission defects, and neurogenic muscle atrophy that are more prominent in male mice. Increased centrally located nuclei, intrinsic contractile and relaxation muscle defects were also identified in both female and male mice, with some male predominance. There was an absence of extra-neuronal pathology. Interpretation: The Smn(2B/-);SMN2(+/-) mouse provides a model of mild SMA, displaying some hallmark features including reduced weight, sustained motor weakness, electrophysiological transmission deficit, NMJ defects, and muscle atrophy. Early and prominent increase central nucleation and intrinsic electrophysiological deficits demonstrate the potential role played by muscle in SMA disease. The use of this model will allow for the understanding of the most susceptible pathogenic molecular changes in motor neurons and muscles, investigation of the effects of SMN depletion in aging, sex differences and most importantly will provide guidance for the currently aging SMA patients treated with the recently approved genetic therapies. (C) 2020 The Author(s). Published by Elsevier B.V.
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页数:14
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