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In native skeletal muscle, densely packed myofibers exist in close contact with surrounding motor neurons and blood vessels, which are embedded in the fibrous connective tissue.
In comparison to conventional two-dimensional 2D cultures, the three-dimensional 3D engineered skeletal muscle models allow structural and mechanical resemblance with native skeletal muscle tissue by providing geometric confinement and physiological matrix stiffness to the cells. In addition, various external stimuli applied to these models enhance muscle maturation along with cell—cell and cell—extracellular matrix interaction. Therefore, 3D in vitro muscle models can adequately recapitulate the pathophysiologic events occurring in tissue—tissue interfaces inside the native skeletal muscle such as neuromuscular junction.
Moreover, 3D muscle models can induce pathological phenotype of human muscle dystrophies such as Duchenne muscular dystrophy by incorporating patient-derived induced pluripotent stem cells and human primary cells. In this review, we discuss the current biofabrication technologies for modeling various skeletal muscle tissue-related diseases i. In particular, these approaches would enable the discovery of novel phenotypic markers and the mechanism study of human muscle diseases with genetic mutations.
The tissue microenvironment comprises uniaxially aligned multinucleated muscle cells myofibers that are arranged in a three-dimensional 3D extracellular matrix ECM scaffold. Owing to the presence of muscle-resident stem cells, also referred as satellite cells SCs , the healthy skeletal muscles exhibit an inherent capacity for regeneration in response to small-scale injuries.