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A cornerstone of autologous cell therapy for Duchenne muscular dystrophy is the engineering of suitable cells to express dystrophin in a stable fashion upon differentiation to muscle fibers. Most viral transduction methods are typically restricted to the expression of truncated recombinant dystrophin derivatives and by the risk of insertional mutagenesis, while non-viral vectors often suffer from inefficient transfer, expression and/or silencing. Here we addressed such limitations by using plasmid vectors containing nuclear matrix attachment regions (MAR). Using in vitro transfection and intra muscular transplantation in nude and immunosuppressed mdx mice, we show that clones of mesoangioblast skeletal muscle progenitors can be generated to mediate stable expression from MAR-containing vectors, while maintaining their ability to differentiate in vitro and in vivo and to express dystrophin after transplantation in dystrophic mouse muscles. We conclude that the incorporation of MARs into plasmid vectors may improve non-viral plasmid-based cell therapy feasibility.

MAR-Mediated Dystrophin Expression in Mesoangioblasts for Duchenne Muscular Dystrophy Cell Therapy