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Comparative transcriptomic analysis ofcirculatingand muscle resident fibroadipogenic progenitors in middle cerebral artery occlusion (MCAO) mice.

ABSTRACT: Patients surviving stroke usually experience rapid muscle wasting and an increased risk of physical disability. Although multifactorial interactions including malnutrition, disuse, systemic catabolic imbalance and neurohormonal dysregulation are considered to contribute to the progression of stroke-related sarcopenia, the underlying mechanisms of this brain-muscle crosstalk remain elusive. Muscle-resident fibro/adipogenic progenitors (FAPs) are indispensable for maintaining muscle homeostasis and function as initial sensors of external perturbations. In the present study, we illustrate that FAPs rapidly respond to the overactive sympathetic nervous system (SNS), and egress from the muscle niche into circulation during the acute phase of stroke. In our study, we performed comparative transcriptomic analysis of circulating fibroadipogenic progenitors and muscle resident fibroadipogenic progenitors.

ORGANISM(S): Mus musculus

PROVIDER: GSE272033 | GEO | 2025/07/31

REPOSITORIES: GEO

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Project description:Fibro-adipogenic progenitors (FAPs) are emerging cellular components of the skeletal muscle regenerative environment. The alternative functional phenotype of FAPs - either supportive of muscle regeneration or promoting fibro-adipogenic degeneration M-bM-^@M-^S is a key determinant in the pathogenesis of muscular diseases, including Duchenne Muscular Dystrophy (DMD). However, the molecular regulation of FAPs is still unknown. We show here that an M-bM-^@M-^\HDAC-myomiR-BAF60 variant networkM-bM-^@M-^] regulates the functional phenotype of FAPs in dystrophic muscles of mdx mice. Combinatorial analysis of gene expression microarray and genome-wide chromatin remodeling by Nuclease accessibility (NA)-seq revealed that HDAC inhibitors de-repress a M-bM-^@M-^\latentM-bM-^@M-^] myogenic program in FAPs from dystrophic muscles at early stages of disease progression. In these cells HDAC inhibition promoted the expression of two core components of the myogenic transcriptional machinery, MyoD and BAF60C, and upregulated the myomiRs (miRs) 1.2, 133 and 206, which target two alternative BAF60 variants (BAF60A and B) ultimately leading to the activation of a pro-myogenic program at the expense of the fibro-adipogenic phenotype. By contrast, FAPs from dystrophic muscles at late stages of disease progression displayed resistance to HDACi-induced chromatin remodeling at myogenic loci and fail to activate the pro-myogenic phenotype. These results reveal a previously unappreciated disease stage-specific bipotency of mesenchimal cells within the regenerative environment of dystrophic muscles. Resolution of such bi-potency by epigenetic interventions, such as HDACi, provides the molecular rationale for the in situ reprogramming of target cells to promote therapeutic regeneration of dystrophic muscles. Genome-wide chromatin accessibility patterns in FAPs cells derived from mdx mice at different ages treated either with HDAC inhibitor Trichostatin A (TSA) or with vehicle (saline solution) were assessed using NA-seq (PMID: 19289091)

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Comparative transcriptomic analysis ofcirculatingand muscle resident fibroadipogenic progenitors in middle cerebral artery occlusion (MCAO) mice.

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