At a glance
Type
Pegylated Mechano Growth Factor
Also known as
IGF-1Ec E-domain peptide
Molecular weight
Varies with PEG length
Studied for
Muscle repairSatellite cellsRecovery
PEG-MGF is a pegylated form of Mechano Growth Factor (MGF) — a splice variant of IGF-1 (IGF-1Ec) that muscle produces locally in response to mechanical stress. The PEG (polyethylene glycol) attachment is meant to protect the peptide and extend how long it lasts.
How PEG-MGF works
When muscle is loaded or damaged, it briefly splices the IGF-1 gene toward the MGF/IGF-1Ec isoform, producing an early “pulse” whose E-domain peptide is thought to activate satellite (muscle stem) cells and drive myoblast proliferation — before splicing shifts to standard IGF-1, which promotes the cells to mature and fuse. PEGylation is intended to slow the peptide’s breakdown and clearance, lengthening its functional window.
What the research shows
- MGF splice variant induced by stretch (McKoy et al., 1999). Mechanical stretch plus stimulation induced the MGF/IGF-1Ec splice variant in muscle.
- Proliferation vs differentiation (Yang & Goldspink, 2002). The MGF E-peptide drove myoblast proliferation, while mature IGF-1 drove differentiation.
- Satellite-cell activation (Hill & Goldspink, 2003). In vivo, the MGF pulse preceded and was associated with satellite-cell activation after muscle damage.
- Human progenitor cells (Kandalla et al., 2011). The MGF E-peptide activated human muscle progenitor cells and raised their fusion potential across ages.
Candour: most credible evidence is on MGF/IGF-1Ec biology in cell and animal models, and the E-peptide’s independent activity is still debated; PEG-MGF specifically has essentially no human clinical data. There is no single standardised molecular weight or CAS for PEG-MGF, since the PEG length varies. Use belongs under a physician’s guidance.
Molecular specification
| Type | Pegylated Mechano Growth Factor |
| Also known as | IGF-1Ec E-domain peptide (MGF), PEGylated |
| Molecular weight | Not standardised — varies with PEG length |
| CAS number | None assigned |
Quality and sourcing
Every batch of Azzurri Wellness PEG-MGF is compounded through a Registered 503B outsourcing facility under GMP-compliant processes, HPLC-tested for purity and potency, and third-party lab verified. Shipped cold-pack when needed to protect stability.
References
- McKoy G, et al. Expression of insulin growth factor-1 splice variants and structural genes in rabbit skeletal muscle induced by stretch and stimulation. J Physiol. 1999;516(2):583–592. PubMed
- Yang SY, Goldspink G. Different roles of the IGF-I Ec peptide (MGF) and mature IGF-I in myoblast proliferation and differentiation. FEBS Lett. 2002;522(1-3):156–160. PubMed
- Hill M, Goldspink G. Expression and splicing of the IGF gene in rodent muscle is associated with muscle satellite (stem) cell activation following local tissue damage. J Physiol. 2003;549(2):409–418. PubMed
- Kandalla PK, et al. Mechano Growth Factor E peptide (MGF-E) activates human muscle progenitor cells and induces an increase in their fusion potential at different ages. Mech Ageing Dev. 2011;132(4):154–162. PubMed
Compiled by the Azzurri Wellness Research Team and checked against the cited literature. Educational only — not medical advice.
