Mechano Growth Factor (MGF) is a synthetic peptide derived from the alternative splicing of the insulin-like growth factor 1 (IGF-1) protein. Comprising 24 amino acids, MGF has a molecular mass of just over 2,866 g/mol.

Known as the MGF-24aa-E peptide, this variant results from a 49 base pair (bp) insert in the human IGF-1 gene, forming a distinct isoform, IGF-1Ec.

Human Muscle Progenitor Cell Research

In vitro studies using human muscle progenitor cells found that the MGF-E peptide activated these cells and increased their fusion potential, with this effect observed across progenitor cells derived from donors of different ages.¹

Peptide Structure: The E-Domain Versus Mature IGF-1

MGF corresponds specifically to the C-terminal E-domain that is cleaved away during processing of the full IGF-1 precursor, distinguishing it structurally from the 70-amino-acid mature IGF-1 protein that retains the classic IGF-1 receptor-binding domains.

Researchers studying this splice variant have noted that the E-domain peptide's basic core, rich in lysine and arginine residues, combined with a short acidic Glu-Glu segment near the C-terminus, gives it a charge and solubility profile distinct from mature IGF-1.

Analytical Purity Verification

As a 24-residue peptide with several basic residues clustered together, MGF synthesis is prone to specific byproducts such as incomplete couplings around the arginine- and lysine-rich core, making combined HPLC and mass spectrometry verification an important step before use in signaling assays.

Storage and Handling in the Laboratory Setting

Lyophilized MGF is stored under sub-zero freezer conditions to preserve integrity prior to use, since degradation of the peptide could otherwise introduce variability into cell-based assays examining progenitor cell activation or other MGF-related signaling endpoints.

Comparative Research Context Among IGF-1 Splice Variants

MGF is frequently studied alongside other IGF-1 splice variants, including IGF-1Ea, the predominant circulating form produced in the liver.

Researchers comparing these isoforms have focused on their differential signaling behaviors, using MGF's apparent IGF-1-receptor-independent activity as a point of contrast when investigating which effects of IGF-1 gene splicing depend on classical receptor engagement versus alternative signaling routes.

Important Notice

This product is strictly intended for in vitro laboratory research use only. It is not approved for any form of human consumption, diagnostic procedures, or medical treatment. Its use is restricted to controlled research environments, and these findings do not establish safety, efficacy, or suitability for any human application.

References

1. Kandalla PK, Goldspink G, Butler-Browne G, Mouly V. Mechano Growth Factor E peptide (MGF-E), derived from an isoform of IGF-1, activates human muscle progenitor cells and induces an increase in their fusion potential at different ages. Mech Ageing Dev. 2011;132(4):154-162.