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IGF-1Ec, IGF-1Eb, Mechano-Growth Factor
A splice variant of IGF-1 that promotes muscle repair, hypertrophy, and satellite cell activation in response to mechanical stress or damage.
Goldspink. G G; Yang. S Y SY
The study shows that a special form of IGF‑1 called MGF is produced in muscle when it’s stretched, especially if you add electrical stimulation. MGF helps build protein and protects muscle cells, which is especially useful as we age because the liver’s IGF‑1 drops. So, doing intense stretch or eccentric work (and maybe EMS) can boost this local growth factor and aid muscle repair and growth.
Yang. Shi Yu SY; Goldspink. Geoffrey G
The study shows that the IGF‑I Ec peptide (also called MGF) makes muscle precursor cells multiply more but stops them from fully maturing into muscle fibers, and it does this through a different receptor than regular IGF‑I. This helps explain why older people and those with muscle diseases lose muscle, because their MGF production is altered.
Hameed. M M; Toft. A D AD; Pedersen. B K BK; Harridge. S D R SD; Goldspink. G G
A 60‑minute eccentric cycling workout (pedaling backwards) raises the muscle’s MGF gene activity in both young and older adults, while not changing another IGF‑I form, suggesting this type of exercise triggers a repair‑related signal regardless of age.
Yi. Qian Q; Feng. Jianguo J; He. Ling L; Wan. Rongxue R; Zeng. Hui H; Yang. Li L; Wu. Shiyong S; Tan...
The study shows that the full IGF‑1Ec (MGF) protein has two parts: the front part (similar to IGF‑1) helps muscle cells multiply, while the back part (the MGF‑E peptide) helps them turn into mature muscle cells and move. Using only the MGF‑E fragment won’t give all the benefits of the whole IGF‑1Ec protein for muscle repair.
Deng. Moyuan M; Zhang. Bingbing B; Wang. Ke K; Liu. Feng F; Xiao. Hualiang H; Zhao. Jianhua J; Liu....
A short piece of the mechano growth factor protein (MGF‑Ct24E) helped bone‑building cells grow faster and improved healing of a broken bone in rabbits, working better than regular IGF‑1 at the doses tested.
Quesada. Arnulfo A; Micevych. Paul P; Handforth. Adrian A
A short piece of the IGF‑1 related peptide called MGF24 was shown in lab cells and rats to protect dopamine‑producing brain cells from damage by boosting a protective protein called HO‑1. The protection worked even when the usual IGF‑1 pathway was blocked, suggesting a new way the peptide helps neurons survive. However, the work is still early‑stage and has only been tested in animals, not people.
Wei. Wenzhen W; Liu. Songcai S; Song. Jie J; Feng. Tianqi T; Yang. Rui R; Cheng. Yunyun Y; Li. Haoya...
A specific version of the mechano growth factor peptide called T‑MGF‑19E helped mouse bone cells grow, turn into bone‑forming cells, and lay down mineral, and it also sped up healing of a bone defect in rabbits when given at a low dose. The study was done in cells and animals, not people.
Pöllänen. Eija E; Ronkainen. Paula H A PH; Horttanainen. Mia M; Takala. Timo T; Puolakka....
A year‑long hormone replacement therapy (2 mg estradiol + 1 mg norethisterone acetate) in post‑menopausal women raised the muscle’s own MGF (IGF‑1Ec) and other growth‑related genes, which was linked to bigger muscles. Lab cells didn’t show the same effect, suggesting the whole‑body environment matters.
Sha. Yongqiang Y; Afandi. Ruli R; Zhang. Bingbing B; Yang. Li L; Lv. Yonggang Y
A lab study found that treating injured knee ligament cells with the MGF‑E peptide helped them grow faster and make more of the right kind of collagen, while also lowering enzymes that break down tissue. This effect works through a known cell‑signaling pathway (MEK‑ERK1/2).
Mills. Philippe P; Lafrenière. Jean-François JF; Benabdallah. Basma Fattouma BF; El Fahime...
The study shows that a short synthetic piece of the IGF‑1Ec protein, called MGF‑Ct24E, can make human muscle‑stem cells move more easily, which could help muscle repair, but it’s still early‑stage lab work and not a ready‑to‑use supplement.
Sha. Yongqiang Y; Lv. Yonggang Y; Xu. Zhiling Z; Yang. Li L; Hao. Xiaoying X; Afandi. Ruli R
The study shows that a short pre‑treatment with the MGF‑E peptide can help bone‑marrow stem cells keep growing and turn into bone‑forming cells even when oxygen levels are very low. It works by lowering a stress protein (HIF‑1α) and activating two cell‑signaling pathways (MEK‑ERK1/2 and PI3K‑Akt). While this is only cell‑culture work, it hints that MGF‑E might aid bone healing in tough conditions like injuries or surgeries where blood flow is limited.
Hanke. Nina N; Kubis. Hans-Peter HP; Scheibe. Renate J RJ; Berthold-Losleben. Mark M; Hüsing. O...
The study shows that gently moving muscle cells in a fluid (like a rotary shaker) creates a passive stretch that makes them produce more fast‑twitch muscle proteins (MHC IId/x). This happens through a cell‑surface receptor called integrin that turns on a signaling pathway (p38 MAP‑kinase), while the usual growth pathway (IGF‑1/Akt/mTOR) stays quiet. In simple terms, just stretching muscles—even without active contraction—can push them toward a faster, stronger type, but the work was done in a dish, not people.
Ates. Kenan K; Yang. Shi Yu SY; Orrell. Richard W RW; Sinanan. Andrea C M AC; Simons. Paul P; Solomo...
The study shows that a short piece of the IGF‑1 protein called MGF can boost the number of muscle stem‑like cells in both healthy and diseased muscle, but it also slows down the cells turning into mature muscle fibers. This could help muscle repair, but might not directly increase muscle size on its own.
Goldspink. Geoffrey G
The study says that as we get older, a natural protein called MGF (a form of IGF‑1) drops, which contributes to losing muscle and strength. Giving extra MGF can wake up muscle stem cells, helping repair and grow muscle tissue, which could improve strength and reduce frailty in seniors.
Janssen. Joseph A M J L JA; Hofland. Leo J LJ; Strasburger. Christian J CJ; van den Dungen. Elisabet...
The study shows that the full‑length version of MGF can turn on the IGF‑I receptor just as strongly as regular IGF‑I, but you need a lot more of it to do so. It also hits insulin receptors, especially the B type, even better than insulin itself. Shorter MGF forms didn’t work on the IGF‑I receptor. This means the full‑length peptide has some IGF‑I‑like activity, but you’d likely need high doses, and it’s unclear how this translates to real‑world use.
Wilborn. Colin D CD; Taylor. Lemuel W LW; Greenwood. Michael M; Kreider. Richard B RB; Willoughby. D...
A single session of resistance training, whether you do moderate weight with lots of reps (60‑65% of your max) or heavier weight with fewer reps (80‑85% of your max), triggers the muscle’s own growth signals. About two hours after the workout, the genes that make IGF‑1, its receptor, and the mechano‑growth factor (MGF) all go up, while the genes that block growth go down. This shows that a wide range of typical gym intensities can activate the pathways that biohackers try to boost with peptide supplements.
Goldspink. G G
The study shows that when muscles are stretched or overloaded, they make a special form of IGF‑1 called mechano growth factor (MGF) that helps repair and grow muscle locally. This MGF is different from the liver‑produced IGF‑1 and works right where the muscle is stressed, without messing up blood sugar. Muscles that lack proper structural proteins (like in some dystrophies) don’t make MGF when stretched, highlighting its role in muscle health.
Goldspink. Geoffrey G
The study shows that a special form of IGF‑1 called MGF is produced in muscle when it’s mechanically stressed (like during resistance training). This peptide helps activate satellite cells that repair and grow muscle, but its production drops with age and in dystrophic muscle, which may limit muscle maintenance. Over‑expressing MGF can cause muscle hypertrophy, indicating its key role in muscle growth and repair.
Ahtiainen. Juha P JP; Lehti. Maarit M; Hulmi. Juha J JJ; Kraemer. William J WJ; Alen. Markku M; Nyma...
After a very heavy leg workout, the body naturally increases the genetic signals for IGF‑1 (including the MGF variant) in the leg muscle, which are thought to help repair and grow muscle. However, the levels of the androgen receptor don’t change, and strength stays reduced for about six days before feeling better than before. This shows that intense training triggers a natural MGF response, but the study doesn’t test taking the peptide itself.
Wackerhage. Henning H; Ratkevicius. Aivaras A
The abstract explains that heavy resistance training and about 20 g of protein right after a workout can boost muscle building for up to three days. It also shows that the muscle‑growth engine (mTOR) is turned on by signals like IGF‑1/MGF, mechanical stress, amino acids, and the muscle’s energy state, while myostatin works against growth. For biohackers, this means the basics—hard training, timely protein, and possibly IGF‑1/MGF‑type peptides—are what drive growth, and blocking myostatin could help further.