MGF (Mechano Growth Factor) Peptide

MGF (Mechano Growth Factor) is a splice variant of IGF-1 produced locally by muscle tissue in response to mechanical loading or damage. Unlike systemic IGF-1, MGF acts as a localised signal that activates satellite cells — the muscle stem cells responsible for repair and hypertrophy — making it a subject of intense research interest in muscle biology and post-injury recovery contexts.

The native, unmodified form of MGF is characterised by an extremely short half-life of approximately 5–7 minutes, as it is rapidly cleared by serum proteases. This rapid degradation restricts its action to the local tissue environment, which is thought to be central to its physiological role. PEG-MGF, a pegylated derivative, was developed specifically to extend this half-life for systemic research applications, and the two peptides are frequently compared in preclinical studies.

Research into MGF has focused on its E-domain peptide sequence — a unique 24-amino-acid region absent in other IGF-1 splice variants — which appears to be responsible for satellite cell activation independently of the IGF-1 receptor pathway. This mechanistic distinction has made MGF a model compound for understanding localised muscle anabolism and repair signalling.