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Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence

Myotonic dystrophy type 2 (DM2) is an autosomal dominant disorder caused by the expansion of the tetranucleotidic repeat (CCTG)n in the first intron of the Zinc Finger Protein-9 gene. In DM2 tissues, the expanded mutant transcripts accumulate in nuclear focal aggregates where splicing factors are se...

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Autores principales: Malatesta, M., Giagnacovo, M., Renna, L.V., Cardani, R., Meola, G., Pellicciari, C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PAGEPress Publications 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3203470/
https://www.ncbi.nlm.nih.gov/pubmed/22073373
http://dx.doi.org/10.4081/ejh.2011.e26
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author Malatesta, M.
Giagnacovo, M.
Renna, L.V.
Cardani, R.
Meola, G.
Pellicciari, C.
author_facet Malatesta, M.
Giagnacovo, M.
Renna, L.V.
Cardani, R.
Meola, G.
Pellicciari, C.
author_sort Malatesta, M.
collection PubMed
description Myotonic dystrophy type 2 (DM2) is an autosomal dominant disorder caused by the expansion of the tetranucleotidic repeat (CCTG)n in the first intron of the Zinc Finger Protein-9 gene. In DM2 tissues, the expanded mutant transcripts accumulate in nuclear focal aggregates where splicing factors are sequestered, thus affecting mRNA processing. Interestingly, the ultrastructural alterations in the splicing machinery observed in the myonuclei of DM2 skeletal muscles are reminiscent of the nuclear changes occurring in age-related muscle atrophy. Here, we investigated in vitro structural and functional features of satellite cell-derived myoblasts from biceps brachii, in the attempt to investigate cell senescence indices in DM2 patients by ultrastructural cytochemistry. We observed that in satellite cell-derived DM2 myoblasts, cell-senescence alterations such as cytoplasmic vacuolization, reduction of the proteosynthetic apparatus, accumulation of heterochromatin and impairment of the pre-mRNA maturation pathways occur earlier than in myoblasts from healthy patients. These results, together with preliminary in vitro observations on the early onset of defective structural features in DM2 myoblast derived-myotubes, suggest that the regeneration capability of DM2 satellite cells may be impaired, thus contributing to the muscular dystrophy in DM2 patients.
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spelling pubmed-32034702011-11-09 Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence Malatesta, M. Giagnacovo, M. Renna, L.V. Cardani, R. Meola, G. Pellicciari, C. Eur J Histochem Original Paper Myotonic dystrophy type 2 (DM2) is an autosomal dominant disorder caused by the expansion of the tetranucleotidic repeat (CCTG)n in the first intron of the Zinc Finger Protein-9 gene. In DM2 tissues, the expanded mutant transcripts accumulate in nuclear focal aggregates where splicing factors are sequestered, thus affecting mRNA processing. Interestingly, the ultrastructural alterations in the splicing machinery observed in the myonuclei of DM2 skeletal muscles are reminiscent of the nuclear changes occurring in age-related muscle atrophy. Here, we investigated in vitro structural and functional features of satellite cell-derived myoblasts from biceps brachii, in the attempt to investigate cell senescence indices in DM2 patients by ultrastructural cytochemistry. We observed that in satellite cell-derived DM2 myoblasts, cell-senescence alterations such as cytoplasmic vacuolization, reduction of the proteosynthetic apparatus, accumulation of heterochromatin and impairment of the pre-mRNA maturation pathways occur earlier than in myoblasts from healthy patients. These results, together with preliminary in vitro observations on the early onset of defective structural features in DM2 myoblast derived-myotubes, suggest that the regeneration capability of DM2 satellite cells may be impaired, thus contributing to the muscular dystrophy in DM2 patients. PAGEPress Publications 2011-08-27 /pmc/articles/PMC3203470/ /pubmed/22073373 http://dx.doi.org/10.4081/ejh.2011.e26 Text en ©Copyright M. Malatesta et al., 2011 This work is licensed under a Creative Commons Attribution NonCommercial 3.0 License (CC BY-NC 3.0). Licensee PAGEPress, Italy
spellingShingle Original Paper
Malatesta, M.
Giagnacovo, M.
Renna, L.V.
Cardani, R.
Meola, G.
Pellicciari, C.
Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title_full Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title_fullStr Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title_full_unstemmed Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title_short Cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
title_sort cultured myoblasts from patients affected by myotonic dystrophy type 2 exhibit senescence-related features: ultrastructural evidence
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3203470/
https://www.ncbi.nlm.nih.gov/pubmed/22073373
http://dx.doi.org/10.4081/ejh.2011.e26
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