Abnormalities in Early Markers of Muscle Involvement Support a Delay in Myogenesis in Spinal Muscular Atrophy
Por:
Martinez-Hernandez, R, Bernal, S, Alias, L, Tizzano, EF
Publicada:
1 jun 2014
Resumen:
Spinal muscular atrophy (SMA) is characterized by loss of motor neurons in the spinal cord that results in muscle denervation and profound weakness in affected patients. We sought evidence for primary muscle involvement in the disease during human development by analyzing the expression of several muscle cytoskeletal components (i.e. slow, fast, and developmental myosin, desmin, and vimentin) in fetal or postnatal skeletal muscle samples from 5 SMA cases and 6 controls. At 14 weeks' gestation, SMA samples had higher percentages of myotubes expressing fast myosin and lower percentages of myotubes expressing slow myosin versus control samples. Desmin and vimentin were highly expressed at prenatal stages without notable differences between control and SMA samples, although both proteins showed persistent immunostaining in atrophic fibers in postnatal SMA samples. We also studied the expression of Pax7-positive nuclei as a marker of satellite cells and found no differences between control and SMA prenatal samples. There was, however, a significant increase in satellite cells in postnatal atrophic SMA fibers, suggesting an abnormal myogenic process. Together, these results support the hypothesis of a delay in muscle maturation as one of the primary pathologic components of SMA. Furthermore, myosins and Pax7 may be useful research markers of muscle involvement in this disease.
Filiaciones:
Martinez-Hernandez, R:
Hosp La Princesa, Dept Mol Biol, Madrid, Spain
Bernal, S:
Hosp Santa Creu & Sant Pau, IIB St Pau Res Inst, Dept Genet, Barcelona, Spain
Ctr Invest Biomed Red Enfermedades Raras, Barcelona, Spain
Alias, L:
Hosp Santa Creu & Sant Pau, IIB St Pau Res Inst, Dept Genet, Barcelona, Spain
Ctr Invest Biomed Red Enfermedades Raras, Barcelona, Spain
Tizzano, EF:
Hosp Valle De Hebron, Dept Clin & Mol Genet, Barcelona 08035, Spain
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