Desmin prevents muscle wasting, exaggerated weakness and fragility, and fatigue in dystrophic mdx mouse - CRM - Centre de recherche en myologie - U974 Accéder directement au contenu
Article Dans Une Revue The Journal of Physiology Année : 2020

Desmin prevents muscle wasting, exaggerated weakness and fragility, and fatigue in dystrophic mdx mouse

Résumé

Abstract: Duchenne muscular dystrophy (DMD) is a severe neuromuscular disease caused by dystrophin deficiency. Desmin, similar to dystrophin, is associated with costameric structures bridging sarcomeres to the extracellular matrix that contributes to muscle function. In the present study, we attempted to provide further insight into the roles of desmin, for which the expression is increased in the muscle from the mouse mdx DMD model. We show that a deletion of the desmin gene (Des) in mdx mice [double knockout (DKO) mice, mdx:desmin-/-] induces a marked muscle weakness; namely, a reduced absolute maximal force production and increased fatigue compared to that in mdx mice. Fragility (i.e. higher susceptibility to contraction-induced injury) was also aggravated in DKO mice compared to mdx mice, despite the promotion of supposedly less fragile muscle fibres in DKO mice, and this worsening of fragility was related to a decreased muscle excitability. Moreover, in contrast to mdx mice, the DKO mice did not undergo muscle hypertrophy, as indicated by smaller and fewer fibres, with a reduced percentage of centronucleated fibres, potentially explaining the severe muscle weakness. Notably, Desmin cDNA transfer with adeno-associated virus in newborn mdx mice improved specific maximal force normalized to muscle weight. Overall, desmin plays important and beneficial roles in muscle wasting, performance and fragility in dystrophic mdx mice, which differ, at least in part, from those observed in healthy muscle.
Fichier principal
Vignette du fichier
Ferry et al. - Desmin prevents muscle wasting, exaggerated weakne.pdf (326.11 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02996889 , version 1 (13-11-2020)

Identifiants

Citer

Arnaud Ferry, Julien Messéant, Ara Parlakian, Mégane Lemaitre, Pauline Roy, et al.. Desmin prevents muscle wasting, exaggerated weakness and fragility, and fatigue in dystrophic mdx mouse. The Journal of Physiology, 2020, 598 (17), pp.3667-3689. ⟨10.1113/JP279282⟩. ⟨hal-02996889⟩
149 Consultations
262 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More