Insulin-like growth factor 1 Ec E-peptide (Mechano-growth factor) (MGF)

Mechano-growth factor (MGF), specifically the C-terminal E-peptide of the IGF-1Ec splice variant, is a locally produced growth factor that plays a pivotal role in tissue repair and adaptation, particularly in skeletal muscle (Goldspink, 2005). Unlike systemic IGF-1, MGF is primarily expressed in response to mechanical strain or tissue injury, acting as a local repair factor (Philippou et al., 2014). It functions by stimulating the proliferation of satellite cells, which are the resident stem cells of muscle tissue, thereby facilitating the repair and hypertrophy of muscle fibers (Matheny et al., 2010). Beyond its myogenic properties, MGF has demonstrated potential neuroprotective and cardioprotective effects in various experimental models, suggesting a broader role in tissue homeostasis (Dluzniewska et al., 2005). While it is a subject of significant interest for treating muscle-wasting conditions such as sarcopenia and muscular dystrophy, it is also classified as a performance-enhancing substance and is prohibited by the World Anti-Doping Agency (WADA, 2023). Research continues to investigate its specific signaling pathways, which appear to be distinct from the classical IGF-1 receptor-mediated signaling, potentially involving unique cell surface receptors (Aperghis et al., 2004). Therapeutic development has focused on stabilized versions like PEG-MGF to improve its short half-life for clinical applications (Esposito et al., 2009). Despite its potential, the lack of human clinical trials remains a significant hurdle for its approval as a mainstream therapeutic agent.

Other names

MGFMechano-growth factorIGF-1Ec peptideC-terminal propeptide of IGF-1EcIGF-1Ec propeptide

Stimulates the proliferation of satellite cells (muscle stem cells) and promotes tissue repair through signaling pathways that appear to be independent of the classical IGF-1 receptor (IGF-1R).