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The peculiar apoptotic behavior of skeletal muscle cells

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dc.contributor.authorSalucci, Sara
dc.contributor.authorBurattini, Sabrina
dc.contributor.authorBaldassarri, Valentina
dc.date.accessioned2018-06-27T14:33:19Z
dc.date.available2018-06-27T14:33:19Z
dc.date.issued2013
dc.description.abstractApoptosis plays an active role in maintaining skeletal muscle homeostasis. Its deregulation is involved in several skeletal muscle disorders such as dystrophies, myopathies, disuse and sarcopenia. The aim of this work was to study in vitro the apoptotic behavior induced by etoposide, staurosporine and hydrogen peroxide in the C2C12 skeletal muscle cell line, comparing myoblast vs myotube sensitivity, investigated by means of morphological and cytofluorimetric analyses. Myotubes appeared more resistant than myoblasts to apoptotic induction. In myoblasts treated with etoposide, nuclei with chromatin condensation were observed, in the presence of a diffuse DNA fragmentation, as shown by confocal microscopy. The latter also appeared in myotubes, where apoptotic and normal nuclei coexisted inside the same syncytium. After staurosporine treatment, myobalsts evidenced late apoptotic features and a high number of TUNEL-positive nuclei. Secondary necrosis appeared in myotubes, where myonuclei with cleaved DNA again coexisted with normal myonuclei. After H2O2 exposure, myotubes, differently from myoblasts, showed a poor sensitivity to cell death. Intriguingly, autophagic granules appeared abundantly in myotubes after each treatment. In myotubes, mitochondria were better preserved than in myoblasts since those which were damaged were probably degraded through autophagic processes. These findings demonstrate a scarce sensitivity of myotubes to apoptotic stimuli due to acquisition of an apoptosis-resistant phenotype during differentiation. The presence of nuclear-dependent “territorial” death domains in the syncytium could explain a slower death of myotubes compared to mononucleated cells. In addition, autophagy could preserve and protect muscle cell integrity against chemical stimuli, making C2C12 cells, in particular myotubes, more resistant to apoptosis induction.es
dc.formatapplication/pdfes
dc.format.extent15es
dc.identifier.citationHistology and Histopathology, vol. 28, nº 8 (2013)
dc.identifier.issn1699-5848
dc.identifier.issn0213-3911
dc.identifier.urihttp://hdl.handle.net/10201/59683
dc.languageenges
dc.publisherF. Hernández y Juan F. Madrid. Universidad de Murcia. Departamento de Biología Celular e Histologíaes
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.subjectMyoblastses
dc.subjectMyotubeses
dc.subject.otherCDU::5 - Ciencias puras y naturales::57 - Biología::576 - Biología celular y subcelular. Citologíaes
dc.titleThe peculiar apoptotic behavior of skeletal muscle cellses
dc.typeinfo:eu-repo/semantics/articlees
dspace.entity.typePublicationes
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Histology and histopathology Vol.28, nº 8 (2013)