PEGylated MGF
moderate riskAlso: Mechano Growth Factor · PEG-MGF · IGF-1Ec splice variant
Mechano Growth Factor (MGF) is a splice variant of IGF-1 produced locally in response to mechanical stress (exercise). PEGylation extends its short half-life. Acts on satellite (muscle stem) cells, distinct from the systemic IGF-1 receptor axis.
Reported Benefits
Satellite cell activation / muscle repair
Animal models show significant satellite cell proliferation and accelerated muscle repair post-injury.
Mechanism of Action
Unique E-domain peptide acts on a distinct receptor from IGF-1R (not fully characterized); activates muscle satellite cells; promotes myoblast proliferation and differentiation; PEGylation extends half-life to ~3 days.
The Satellite Cell Mechanism
MGF’s appeal lies in its specific targeting of muscle satellite cells — the stem cells responsible for muscle hypertrophy and repair. This mechanism is distinct from and potentially additive to the systemic IGF-1 axis, making it of interest for sports medicine applications.
Human data is essentially absent beyond theoretical extrapolation from animal models.
Regulatory Status
Research OnlySafety Profile
Side Effects
- •WADA-prohibited
- •Limited safety data
- •Potential immune response to PEG
Contraindications
- •Active malignancy
Drug Interactions
- •Insulin
- •IGF-1 preparations
Primary Uses
Weekly Briefing
Regulatory updates + new study breakdowns.
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