Injured skeletal muscle fibers and muscle niche

The injured skeletal muscle fibers and the surrounding muscle niche constitute a dynamic microenvironment essential for muscle repair and regeneration. This niche is composed of various cellular components, including satellite cells (the primary muscle stem cells), fibro-adipogenic progenitors (FAPs), and immune cells like macrophages, all embedded within a specialized extracellular matrix (ECM) (Yin et al., 2013, Physiol Rev). Following injury, a coordinated sequence of inflammation, satellite cell activation, proliferation, and differentiation occurs to restore muscle function (Bentzinger et al., 2012, Cold Spring Harb Perspect Biol). While the niche itself is a physiological location rather than a single molecular target, it serves as the critical site for therapeutic interventions in diseases such as Duchenne muscular dystrophy and age-related sarcopenia. Pharmacological strategies often target specific signaling pathways within this niche, such as the myostatin/activin pathway or IGF-1 signaling, to enhance muscle mass and regenerative capacity (Tidball, 2017, Nat Rev Immunol). Understanding the interplay between these components is vital for developing regenerative medicines that can effectively restore muscle integrity after trauma or chronic degeneration (Dumont et al., 2015, Annu Rev Cell Dev Biol).

Other names

Muscle regenerative nicheMyogenic nicheSkeletal muscle injury microenvironmentSatellite cell niche

Modulation of the regenerative microenvironment to promote satellite cell activation, reduce pathological fibrosis, and enhance the fusion of myoblasts into injured myofibers.