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Home/Muscle Building & Performance/PEG-MGF (PEGylated Mechano Growth Factor)

PEG-MGF (PEGylated Mechano Growth Factor)

The PEGylated form of mechano growth factor, an IGF-1 splice variant studied for satellite-cell activation and muscle repair in animal models.

Overview

Mechano growth factor (MGF) is the insulin-like growth factor-1 Ec (IGF-1Ec) splice variant expressed in skeletal muscle in response to mechanical loading and injury. PEG-MGF is the polyethylene-glycol-conjugated form of this peptide, used in research to prolong its short half-life in circulation. Most available information comes from muscle-biology studies in animal models and from the research-compound market; it is not an approved drug.

Mechanism

MGF differs from the liver-type IGF-1Ea variant by a carboxy-terminal E-domain sequence that is proposed to activate satellite cells, the muscle stem-cell pool responsible for post-injury repair. PEGylation reduces renal clearance and proteolytic degradation, extending the peptide's exposure time. Its receptor pharmacology is still debated, with some effects attributed to IGF-1 receptor signaling and others to distinct actions of the E-domain region.

Dosing

Research dosing refers to subcutaneous or intramuscular injection protocols used in animal models of muscle injury and in laboratory experiments; human clinical dosing is not established.

  • Dose and frequency vary widely across published animal protocols
  • PEGylation means effective molar doses are typically lower than for unmodified IGF-1 variants
  • Human use outside regulated trials is unsupported by clinical data

Expected Effects

  • Satellite-cell activation and enhanced muscle regeneration reported after injury in animal models
  • Increased local IGF-1 signaling during the early repair phase
  • Claims of systemic hypertrophy or performance enhancement in humans lack controlled clinical evidence

Side Effects & Tolerability

Tolerability data come mainly from animal studies, and human safety is poorly characterized. As a modulator of growth-factor pathways, theoretical concerns include mitogenic signaling, hypoglycemia-like effects at high doses, and injection-site reactions. Long-term effects are unknown.

Storage

Lyophilized peptide should be stored cold and desiccated, protected from light. Reconstituted solutions are typically aliquoted to avoid repeated freeze-thaw cycles. Follow the supplier certificate of analysis.

Related peptides

ACE-031Soluble ActRIIB-Fc decoy receptor for myostatin studied as a muscle-mass candidate; a protein biologic, not a peptide, with a discontinued clinical program.Follistatin 344Natural glycoprotein isoform (344 amino acids) that neutralizes myostatin; research interest centers on gene-therapy delivery to increase muscle mass.GDF-8 (Myostatin)Myostatin (GDF-8), a TGF-beta-family protein that limits skeletal muscle growth; a research target for muscle-loss conditions.IGF-1 LR3Engineered 83-amino-acid analog of insulin-like growth factor 1 with reduced binding-protein affinity, used in growth research.IGF-DES (1-3)Naturally occurring truncated IGF-1 variant lacking the first three amino acids; high receptor potency with a very short half-life.Muscle Fiber Type Conversion AnalogsCatalog heading about shifting muscle fiber types; no defined peptide product with published evidence under this name.