Overview
MGF, or Mechano Growth Factor, refers to a splice variant of the insulin-like growth factor 1 (IGF-1) gene known as IGF-1Ec. It was identified in research on how skeletal muscle responds to mechanical overload and injury, where the IGF-1 gene is alternatively spliced to produce this isoform with a distinct C-terminal E-domain.
In experimental settings, the unique E-domain peptide portion of MGF has been studied separately from the IGF-1 core, and is the focus of much of the muscle-repair signaling research associated with this molecule.
Mechanism of action
Research describes MGF’s E-domain peptide as acting through a pathway that appears at least partly distinct from the classical IGF-1 receptor. The E-domain has been studied for its proposed role in activating and proliferating muscle satellite cells, the resident progenitor cells involved in skeletal muscle repair and growth.
The literature frames MGF as an early-response factor following mechanical stress, with its signaling preceding the more sustained anabolic action attributed to systemic IGF-1 in muscle remodeling models.
Research findings
Identified as the IGF-1Ec splice variant expressed after mechanical muscle loading.,Research suggests a role in activating muscle satellite cells in study models.,The distinct E-domain peptide has been studied separately from the IGF-1 core.,Investigated as an early-response factor in muscle repair literature.,Action reported to be partly independent of the classical IGF-1 receptor.
Research context
Research literature describes MGF and its E-domain peptide as having a very short biological half-life on the order of minutes, which has shaped how it is studied and led to interest in stabilized variants. Experimental amounts, preparations, and readouts vary considerably across cell and animal models, and much of the molecular detail remains incompletely characterized. This is a research reference only. Not approved for human use outside regulated settings; consult the primary literature.
Handling & storage
Typically handled in laboratory settings as a lyophilized powder kept desiccated and protected from light. Long-term storage is commonly reported at -20°C or colder, with reconstituted material refrigerated for short periods. Treat as a research chemical under standard laboratory practices.
Reported safety signals
Side effects of MGF are not well characterized in controlled human research. Literature on IGF-related peptides generally notes theoretical considerations around growth-factor signaling, but specific safety data for the MGF peptide remain limited.
Studied alongside
In research contexts MGF has been examined in relation to its PEGylated counterpart PEG-MGF and to IGF-1 analogs such as IGF-1 LR3, where short-acting and longer-acting growth-factor signaling have been compared.
At a glance
Research strengths
- Distinct IGF-1 splice variant of muscle-repair research interest
- Studied for satellite cell activation in models
- Unique E-domain peptide examined independently
- Framed as an early-response factor in muscle remodeling
Limitations & cautions
- Very short reported biological half-life
- Molecular pathway incompletely characterized
- Limited controlled safety data
- Not approved for human use
