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Fhl2b expression ameliorates muscular dystrophy [5dpf trunk]

ABSTRACT: fhl2b expression ameliorates muscular dystrophy [5dpf trunk]

PROVIDER: PRJNA1011838 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25868071_1.fastq.gz	Fastqsanger.gz
	SRR25868071_2.fastq.gz	Fastqsanger.gz
	SRR25868072_1.fastq.gz	Fastqsanger.gz
	SRR25868072_2.fastq.gz	Fastqsanger.gz
	SRR25868073_1.fastq.gz	Fastqsanger.gz

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fhl2b expression ameliorates muscular dystrophy [20 months EOM and trunk]

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fhl2b expression ameliorates muscular dystrophy [5dpf trunk]

Project description:In muscle dystrophies, muscle fibers loose integrity and die, leading to significant suffering and a shorter life. Strikingly, the extraocular muscles (EOMs), controlling eye movements, are spared and function well despite the disease progression. Although EOMs have been shown to have important differences compared to body musculature the mechanisms underlying this inherent resistance to muscle dystrophies remain largely unknown. Here, we demonstrate important differences in gene expression as a response to muscle dystrophies between the EOMs and trunk muscle in zebrafish via transcriptomic profiling. We show that the LIM-protein Fhl2 is upregulated in response to knockout of desmin, plectin and obscurin, intermediate filament proteins causing different muscle dystrophies, and contributes to disease protection of the EOMs. Moreover, we show that ectopic expression of fhl2b can partially rescue the muscle phenotype in the zebrafish Duchenne muscular dystrophy model sapje, significantly improving their survival rate. Therefore, fhl2 is a protective agent and a candidate target gene for therapy of muscle dystrophies.

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fhl2b expression ameliorates muscular dystrophy [5 months EOM and trunk]

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fhl2b expression ameliorates muscular dystrophy [20 months EOM and trunk]

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Atrogin-1 regulates BiP levels - novel therapeutic targets for Duchenne Muscular Dystrophy

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.

2024-03-07 | PXD038406 | Pride

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