Mechano Growth Factor E peptide (MGF-E), derived from an isoform of IGF-1, activates human muscle progenitor cells and induces an increase in their fusion potential at different ages

This study investigated the effects of MGF E peptide on human muscle progenitor cells (satellite cells) obtained from donors of different age groups. The cells were isolated from muscle biopsies and cultured in vitro, being treated with increasing concentrations of synthetic MGF-E peptide to assess its impact on proliferation, activation, and myogenic fusion capacity.

The results demonstrated that MGF-E significantly increased the proliferative lifespan of human satellite cells and promoted their activation and fusion into multinucleated myotubes. A particularly relevant finding was that these effects were observed in cells from donors of all ages, including the elderly, suggesting that MGF can partially overcome the decline in muscle regenerative capacity associated with aging.

The study reinforced the understanding that the E domain of MGF functions as an autocrine/paracrine signal independent of mature IGF-1, acting specifically on the mobilization and activation of the quiescent satellite cell pool. These findings have important implications for the development of muscle regenerative therapies in elderly populations and in conditions of muscle loss such as sarcopenia and dystrophies.