PEG-MGF (Pegylated Mechano Growth Factor)
PEG-MGF is a synthetic peptide formed by conjugating polyethylene glycol (PEG) to mechano growth factor (MGF), a splice variant of insulin-like growth factor-1 (IGF-1). It is designed to enhance the stability and half-life of native MGF, which is naturally produced in skeletal muscle in response to mechanical stress or injury.
Core Properties
- Full Name: Pegylated Mechano Growth Factor
- CAS Number: 108174-48-7
- Molecular Weight: ~2888.16 g/mol (varies slightly by PEG chain length)
- Solubility: Water-soluble
- Key Modification: PEGylation extends its half-life to approximately 2–3 days, compared to just a few minutes for unmodified MGF.
Mechanism of Action
- Receptor Binding: Binds to IGF-1 receptors, stimulating cell growth and tissue differentiation.
- Satellite Cell Activation: Activates muscle satellite cells—critical for muscle repair and regeneration—promoting their fusion with damaged muscle fibers.
- Protein Synthesis: Enhances muscle protein synthesis while inhibiting protein breakdown, supporting muscle hypertrophy.
- Anti-Apoptotic Effects: Suppresses cell death pathways, aiding tissue survival and repair.
Primary Applications
- Muscle Regeneration: Accelerates recovery from exercise-induced muscle damage and supports muscle growth.
- Wound Healing: Promotes tissue repair in injuries and chronic wounds.
- Osteoporosis Support: Aids in bone tissue growth and remodeling.
- Muscle Wasting: Investigated for conditions like sarcopenia and cachexia associated with chronic illness.
Safety & Regulation
- Limited Human Data: Most research is preclinical (cell/animal studies); no global regulatory approval for human use.
- Administration: Typically via subcutaneous injection (common dosage: 150–200 mcg, 2–3 times weekly for 8–10 weeks).
- Risks: Potential side effects include local injection reactions, fluid retention, and unknown long-term effects. The FDA warns against unregulated use due to insufficient safety data.
Key Distinction from MGF
Native MGF acts locally in muscle tissue with an extremely short half-life. PEGylation creates a "stealth" layer that reduces renal clearance and enzymatic degradation, enabling sustained systemic activity while retaining muscle-targeted effects.
Note: PEG-MGF is often used in fitness and bodybuilding circles for muscle growth, but its clinical use remains experimental. Always consult a healthcare provider before use.
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