What Are The Research Benefits of PEG-MGF
Muscle Structure: Muscle resistance activity significantly activates MGF mRNA expression in muscle tissues, with studies showing up to a 456% increase during resistance exercises. This up-regulation, linked to mechanical stimuli, coincides with elevated growth hormone levels, which alone contribute to an 80% rise in MGF mRNA. Researchers propose this reflects enhanced transcription of the IGF-I gene prior to splicing. Further insights from muscle cell cultures reveal the role of MGF in muscle formation, influencing muscle cell size and chondrocyte migration, highlighting its critical function in tissue repair and adaptation to mechanical stress (1).
Muscle Injury: Skeletal muscle injuries are common in sports medicine, with macrophages playing a vital role in muscle regeneration. Research into mechano growth factor (MGF) has shown it may mitigate the effects of macrophage depletion on muscle healing. While MGF injections did not enhance muscle fibre regeneration, they reduced fibrosis, inflammation, oxidative stress, and chemokine expression in injured muscles (2).
It was also observed that MGF may suppress collagen types I and III, inflammatory cytokines (e.g., TNF-α, IL-1β), chemokines, and oxidative stress markers, which are key contributors to fibrosis and inflammation. Collagens play a key role in fibrotic processes, while reduced oxidative stress markers and matrix metalloproteinases (MMPs) suggest MGF may help alleviate inflammation linked to muscle injury. Although MGF showed limited impact on satellite cell function essential for regeneration, it appears to help modulate the inflammatory environment and oxidative stress, aiding muscle recovery (3).
Muscle Tissue Hypertrophy: A study on MGF examined its effects on muscle cells of different ages. In younger cells, MGF delayed cellular aging and enhanced cell proliferation, promoting muscle regeneration. While older cells did not show increased proliferation, they experienced muscle hypertrophy with larger cell size. MGF also enhanced myotube formation and size across all age groups, potentially improving muscle functionality. However, it reduced the number of reserve cells, suggesting it encourages active participation in muscle repair. Overall, the study highlights MGF’s potential to activate, proliferate, and fuse satellite cells for muscle maintenance and repair (4).
Bone Repair: This study examined the effects of MGF on bone healing in rabbits with 5-mm bone defects. MGF-treated tissues showed significantly better healing compared to controls and those treated with IGF-1. Findings suggest that MGF may enhance bone repair by influencing the cell cycle and activating the MAPK-Erk1/2 signaling pathway, highlighting its potential as a targeted strategy for improving bone regeneration (5).
Heart Protection: This study evaluated the effects of MGF on cardiac muscle cells undergoing apoptosis due to hypoxia. In rat models with 1% oxygen supply, MGF appeared to enhance the migration of mesenchymal stem cells (hMSCs) to the heart, potentially inhibiting apoptosis. Increased Bcl-2 gene levels suggest MGF may support cell survival and tissue regeneration by preventing programmed cell death, highlighting its potential for therapeutic applications (6).
Neuroprotection: Studies on mice investigated the effects of increased MGF levels on brain cells. In one study, mice were bred to overproduce MGF in the hippocampus, leading to higher concentrations of BrdU, a marker of cell proliferation (7). Another study induced conditional MGF production at different ages, with results showing elevated BrdU levels and increased neurogenesis after 2 years (8).
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References For Further Reading
(1) M Hameed, K H W Lange, J L Andersen, P Schjerling, et al (2003) The effect of recombinant human growth hormone and resistance training on IGF-I mRNA expression in the muscles of elderly men – Journal of Physiology, 2003 Oct 18, Volume 555 (Pt 1), Pages 231–240.
(2) X Liu, Z Zeng, L Zhao, P Chen, and W Xiao (2019) Impaired Skeletal Muscle Regeneration Induced by Macrophage Depletion Could Be Partly Ameliorated by MGF Injection – Frontiers in Physiology, 2019 May 17, Volume 10, Page 601.
(3) Keng-Ting Sun, Kwok-Kuen Cheung, Shannon W N Au, Simon S Yeung, and Ella W Yeung (2018) Overexpression of Mechano-Growth Factor Modulates Inflammatory Cytokine Expression and Macrophage Resolution in Skeletal Muscle Injury – Frontiers in Physiology, 2018 Jul 26, Volume 9, Page 999.
(4) Prashanth Kumar Kandalla, Geoffrey Goldspink, Gillian Butler-Browne, and Vincent Mouly (2011) 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 – Mechanisms of Ageing and Development, 2011 Apr, Volume 132 (Issue 4), Pages 154-62.
(5) Moyuan Deng 1, Bingbing Zhang, Ke Wang, Feng Liu, et al (2010) Mechano growth factor E peptide promotes osteoblasts proliferation and bone-defect healing in rabbits – International Orthopaedics, 2010 Nov 6, Volume 35 (Issue 7), Pages 1099–1106.
(6) Golnar Doroudian, James Pinney, Perla Ayala, Tamara Los, et al (2014) Sustained delivery of MGF peptide from microrods attracts stem cells and reduces apoptosis of myocytes – Biomedical Microdevices, 2014 Oct, Volume 16 (Issue 5), Pages 705–715.
(7) Jason J Tang, Jewel L Podratz, Miranda Lange, Heidi J Scrable, et al (2017) Mechano growth factor, a splice variant of IGF-1, promotes neurogenesis in the aging mouse brain – Molecular Brain, 2017 Jul 7, Volume 10, Page 23.
(8) Jason J Tang, Jewel L Podratz, Miranda Lange, Heidi J Scrable, et al (2017) Mechano growth factor, a splice variant of IGF-1, promotes neurogenesis in the aging mouse brain – Molecular Brain, 2017 Jul 7, Volume 10 (Issue 1), Page 23.