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Article Dans Une Revue Am J Pathol Année : 2012

Myotubularin-deficient myoblasts display increased apoptosis, delayed proliferation, and poor cell engraftment

M. W. Lawlor
  • Fonction : Auteur
M. S. Alexander
  • Fonction : Auteur
M. G. Viola
  • Fonction : Auteur
H. Meng
  • Fonction : Auteur
R. Joubert
  • Fonction : Auteur
N. Motohashi
  • Fonction : Auteur
R. A. Manfready
  • Fonction : Auteur
C. P. Hsu
  • Fonction : Auteur
P. Huang
  • Fonction : Auteur
L. M. Kunkel
  • Fonction : Auteur
A. H. Beggs
  • Fonction : Auteur
E. Gussoni
  • Fonction : Auteur

Résumé

X-linked myotubular myopathy is a severe congenital myopathy caused by deficiency of the lipid phosphatase, myotubularin. Recent studies of human tissue and animal models have discovered structural and physiological abnormalities in myotubularin-deficient muscle, but the impact of myotubularin deficiency on myogenic stem cells within muscles is unclear. In the present study, we evaluated the viability, proliferative capacity, and in vivo engraftment of myogenic cells obtained from severely symptomatic (Mtm1delta4) myotubularin-deficient mice. Mtm1delta4 muscle contains fewer myogenic cells than wild-type (WT) littermates, and the number of myogenic cells decreases with age. The behavior of Mtm1delta4 myoblasts is also abnormal, because they engraft poorly into C57BL/6/Rag1null/mdx5cv mice and display decreased proliferation and increased apoptosis compared with WT myoblasts. Evaluation of Mtm1delta4 animals at 21 and 42 days of life detected fewer satellite cells in Mtm1delta4 muscle compared with WT littermates, and the decrease in satellite cells correlated with progression of disease. In addition, analysis of WT and Mtm1delta4 regeneration after injury detected similar abnormalities of satellite cell function, with fewer satellite cells, fewer dividing cells, and increased apoptotic cells in Mtm1delta4 muscle. These studies demonstrate specific abnormalities in myogenic cell number and behavior that may relate to the progression of disease in myotubularin deficiency, and may also be used to develop in vitro assays by which novel treatment strategies can be assessed.

Dates et versions

hal-02881205 , version 1 (25-06-2020)

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Citer

M. W. Lawlor, M. S. Alexander, M. G. Viola, H. Meng, R. Joubert, et al.. Myotubularin-deficient myoblasts display increased apoptosis, delayed proliferation, and poor cell engraftment. Am J Pathol, 2012, 181 (3), pp.961-8. ⟨10.1016/j.ajpath.2012.05.016⟩. ⟨hal-02881205⟩
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