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Gpr18 agonist dampens inflammation, enhances myogenesis, and restores muscle function in models of Duchenne muscular dystrophy

ABSTRACT: Gpr18 agonist dampens inflammation, enhances myogenesis, and restores muscle function in models of Duchenne muscular dystrophy

PROVIDER: PRJNA923348 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23069481_1.fastq.gz	Fastqsanger.gz
	SRR23069481_2.fastq.gz	Fastqsanger.gz
	SRR23069482_1.fastq.gz	Fastqsanger.gz
	SRR23069482_2.fastq.gz	Fastqsanger.gz
	SRR23069483_1.fastq.gz	Fastqsanger.gz

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Gpr18 agonist dampens inflammation, enhances myogenesis, and restores muscle function in models of Duchenne muscular dystrophy

Project description:Muscle wasting in Duchenne Muscular Dystrophy is caused by myofiber fragility and poor regeneration that leads to chronic inflammation and muscle replacement by fibrofatty tissue. Our recent findings demonstrated that Resolvins, a class bioactive lipids derived from omega-3 fatty acids, have the capacity to dampen inflammation and stimulate muscle regeneration to alleviate disease progression. This therapeutic avenue has many advantages compared to glucocorticoids, the current gold-standard treatment for Duchenne Muscular Dystrophy. However, the use of bioactive lipids as therapeutic drugs also faces many technical challenges such as their short-half life. Here, we explored the potential of synthetic agonist of bioactive lipid receptor, namely the Gpr18 agonist PSB-KD107, as a therapeutic alternative for Duchenne Muscular Dystrophy. We showed that PSB-KD107 can stimulate the myogenic capacity of human iPSC-derived myoblasts in vitro. RNAseq analysis revealed an enrichment in biological processes related to lipid metabolism, small molecule biosynthesis, and steroid-related processes in PSB-KD107-treated cells, as well as pathways related to fatty acid signaling such as Peroxisome proliferator-activated receptors, AMP-activated protein kinase, and sphingolipid signaling pathways. In vivo, the treatment of dystrophic mdx mice with PSB-KD107 resulted in reduced inflammation, enhanced myogenesis, and improved muscle function compared to vehicle-treated mice. Overall, our findings identified a novel therapeutic target for the treatment of Duchenne Muscular Dystrophy.

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Myogenesis modelled by human pluripotent stem cells uncovers Duchenne muscular dystrophy phenotypes prior to skeletal muscle commitment

Project description:Duchenne muscular dystrophy (DMD) causes severe disability of children and death of young men, with an incidence of approximately 1/5,000 male births. Symptoms appear in early childhood, with a diagnosis made around 4, a time where the amount of muscle damage is already significant, preventing early therapeutic interventions that could be more efficient at halting disease progression. In the meantime, the precise moment at which disease phenotypes arise – even asymptomatically – is still unknown. Thus, there is a critical need to better define DMD onset as well as its first manifestations, which could help identify early disease biomarkers and novel therapeutic targets. In this study, we have used human induced pluripotent stem cells (hiPSCs) from DMD patients to model skeletal myogenesis, and compared their differentiation dynamics to healthy control cells by a comprehensive multi-omics analysis. Transcriptome and miRnome comparisons combined with protein analyses at 7 time points demonstrate that hiPSC differentiation 1) mimics described DMD phenotypes at the differentiation endpoint; and 2) homogeneously and robustly recapitulates key developmental steps - mesoderm, somite, skeletal muscle - which offers the possibility to explore dystrophin functions and find earlier disease biomarkers. Starting at the somite stage, mitochondrial gene dysregulations escalate during differentiation. We also describe fibrosis as an intrinsic feature of skeletal muscle cells that starts early during myogenesis. In sum, our data strongly argue for an early developmental manifestation of DMD whose onset is triggered before the entry into the skeletal muscle compartment, data leading to a necessary reconsideration of dystrophin functions during muscle development.

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Gene expression data from Duchenne muscular dystrophy patients versus controls

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