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Muscle stem cells give rise to rhabdomyosarcomas in severe model of Duchenne muscular dystrophy

ABSTRACT: Muscle stem cells give rise to rhabdomyosarcomas in severe model of Duchenne muscular dystrophy

PROVIDER: PRJNA508732 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8285480.fastq.gz	Fastqsanger.gz
	SRR8285490.fastq.gz	Fastqsanger.gz
	SRR8285500.fastq.gz	Fastqsanger.gz
	SRR8285510.fastq.gz	Fastqsanger.gz
	SRR8285520.fastq.gz	Fastqsanger.gz

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Muscle Stem Cells Give Rise to Rhabdomyosarcomas in a Severe Mouse Model of Duchenne Muscular Dystrophy.

Project description:Most human cancers originate from high-turnover tissues, while low-proliferating tissues, like skeletal muscle, exhibit a lower incidence of tumor development. In Duchenne muscular dystrophy (DMD), which induces increased skeletal muscle regeneration, tumor incidence is increased. Rhabdomyosarcomas (RMSs), a rare and aggressive type of soft tissue sarcoma, can develop in this context, but the impact of DMD severity on RMS development and its cell of origin are poorly understood. Here, we show that RMS latency is affected by DMD severity and that muscle stem cells (MuSCs) can give rise to RMS in dystrophic mice. We report that even before tumor formation, MuSCs exhibit increased self-renewal and an expression signature associated with RMSs. These cells can form tumorspheres in vitro and give rise to RMSs in vivo. Finally, we show that the inflammatory genes Ccl11 and Rgs5 are involved in RMS growth. Together, our results show that DMD severity drives MuSC-mediated RMS development.

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Muscle stem cells give rise to rhabdomyosarcomas in severe model of Duchenne muscular dystrophy

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Project description:We developed a novel somite-based step-wise strategy for the efficient derivation of functional human myocytes, suggesting that past failures were due to incomplete specification. Treatment with two small molecules inhibiting glycogen synthase kinase 3Î² (GSK-3Î²) and the Notch signaling pathway in undifferentiated hPSCs results in the formation of somite-like cells by Day 4 and, subsequently contractile myotubes in vitro around Day 25 with the ability to engraft and actively participate in muscle repair in vivo. Antibody-based purification can enrich homogenous myocyte populations exhibiting genuine myogenic molecular and cellular characteristics, including extraocular muscle-like features. Furthermore, hPSCs derived from patients with multiple neuromuscular diseases successfully give rise to patient-specific skeletal muscle cells bearing signature phenotypes. Human embryonic stem cell were differentiated to skeletal muscle and compared to non-differentiated cells in triplicate biological replicates. For the confirmation of differentiated cell's characteristics and the global mRNA profiles, We used microarrays to detail the global programme of gene expression underlying cellularisation and identified distinct classes of up-regulated genes during this process. Further more, we used microarrys for the comparing control and disease gene expression profiles, again in triplicate.

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Project description:Skeletal muscle wasting results from numerous pathological conditions impacting both the musculoskeletal and nervous systems. A unifying feature of these pathologies is the upregulation of members of the E3 ubiquitin ligase family, resulting in increased proteolytic degradation of target proteins. Despite the critical role E3 ubiquitin ligases in regulating muscle mass, the specific proteins they target for degradation and the mechanisms by which they regulate skeletal muscle homeostasis remain ill-defined. Here, using zebrafish loss of function models combined with in vivo cell biology and proteomic approaches, we identified the endoplasmic reticulum chaperone, BiP, as a novel target of the E3 ubiquitin ligase atrogin-1. A loss in atrogin-1 results in an accumulation of BiP, leading to impaired mitochondrial dynamics and a subsequent loss in muscle fibre integrity. We further implicate a disruption in atrogin-1 mediated BiP regulation in the pathogenesis of Duchenne Muscular Dystrophy. We reveal that BiP is not only upregulated in Duchenne Muscular Dystrophy, but its inhibition using pharmacological strategies, or by upregulating atrogin-1, significantly ameliorates pathology in a zebrafish model of Duchenne Muscular Dystrophy. Collectively, our data implicates a novel disease axis in the pathogenesis of Duchenne Muscular Dystrophy, and highlights atrogin-1’s essential role in maintaining muscle homeostasis.

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