PEG-MGF
Preclinical ResearchPEGylated Mechano Growth Factor (PEG-MGF)
A pegylated version of Mechano Growth Factor, a splice variant of IGF-1. Extended half-life version studied for muscle repair, growth, and recovery.
Dose
200-400 mcg
Route
SubQ injection
Cycle
4-6 weeks
Storage
Refrigerated (2-8°C)
What is PEG-MGF?
PEG-MGF is a synthetic, pegylated analog of Mechano Growth Factor (MGF), a splice variant of Insulin-like Growth Factor-1 (IGF-1). The MGF E-domain is involved in muscle repair and regeneration following mechanical stress. PEGylation, the attachment of polyethylene glycol, significantly extends the peptide's half-life in the body, allowing for less frequent administration compared to non-pegylated MGF. Research indicates its potential role in activating muscle stem cells (satellite cells), promoting protein synthesis, and supporting muscle fiber repair and growth, making it a subject of interest for muscle recovery and development studies.
Key Benefits
- Muscle repair stimulation
- Satellite cell activation
- Muscle growth support
- Extended action vs MGF
Mechanism of Action
- Activates muscle stem cells (satellite cells)
- Promotes protein synthesis
- Stimulates muscle fiber repair and growth
Best For
- Muscle repair research
- Advanced body composition research
Body Systems
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Molecular Information
Molecular weight
Approximately 28 kDa (MGF peptide is ~8 kDa, PEGylation adds mass)
Length
24 amino acids (for the MGF E-domain portion)
Type
Peptide hormone analog
Amino acid sequence
Y-Q-P-P-S-T-N-K-N-T-K-S-Q-R-R-K-G-S-T-F-E-E-R-K (This is the MGF E-domain sequence, the PEG moiety is covalently attached)
The PEGylation site can vary, commonly at a lysine residue or N-terminus, extending the peptide's circulatory half-life significantly.
Pharmacokinetics
Half-life
72 h
Based on extended half-life often cited in research (e.g., several days). Specific human pharmacokinetic data for PEG-MGF can be limited in readily available literature.
Research Indications
Satellite Cell Activation
Promotes the activation and proliferation of muscle satellite cells, critical for muscle repair and hypertrophy.
Protein Synthesis
Stimulates increased muscle protein synthesis, contributing to muscle mass accumulation.
Muscle Hypertrophy
Research indicates a potential for enhanced muscle growth and development following resistance exercise.
Research Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| General Muscle Growth and Recovery | 200 mcg | 2 times per week | Subcutaneous |
| Targeted Muscle Repair (e.g., post-injury in animal models) | 200-400 mcg | 1-2 times per week | Subcutaneous (potentially localized) |
| Enhanced Athletic Performance | 300 mcg | 2 times per week | Subcutaneous |
| Study of Satellite Cell Proliferation | 100-200 mcg | 1 time per week | Subcutaneous |
| Long-Term Muscle Maintenance (e.g., during caloric deficit in animal models) | 100 mcg | 1 time per week | Subcutaneous |
Timing of administration often centers around periods of muscle recovery or rest, though research protocols vary.
Peptide Interactions
- Synergistic
GHRPs (e.g., Ipamorelin, GHRP-2)
Often discussed in combination, as GHRPs stimulate growth hormone release, which can complement the direct anabolic effects of PEG-MGF on muscle tissue.
- Synergistic
CJC-1295 (DAC)
Similar to GHRPs, CJC-1295 enhances growth hormone pulsatility, potentially providing a more comprehensive anabolic environment when combined with PEG-MGF.
- Monitor Combination
IGF-1 LR3
Both are related to the IGF-1 pathway; combining them could lead to excessive activation of these pathways, requiring careful monitoring in research settings. Potential for increased side effects.
- Use Caution
Insulin
Both compounds have roles in glucose metabolism and nutrient partitioning. Combining them may require close monitoring of blood glucose levels and could increase the risk of hypoglycemia if not carefully managed.
- Monitor Combination
Androgenic Anabolic Steroids (AAS)
Often combined in research models. While theoretically synergistic for muscle growth, the combined effects on various physiological systems and potential for side effects should be meticulously monitored.
How to Reconstitute
- 1Obtain lyophilized PEG-MGF vial and bacteriostatic water for injection.
- 2Swab the rubber stopper of both vials with an alcohol wipe.
- 3Draw 1 mL (or desired volume) of bacteriostatic water into a sterile syringe.
- 4Carefully inject the bacteriostatic water into the PEG-MGF vial, aiming for the side of the vial to minimize direct contact with the lyophilized powder.
- 5Gently swirl the vial (do not shake vigorously) until the powder is completely dissolved. This may take several minutes.
- 6Store the reconstituted solution in the refrigerator.
Care should be taken to avoid vigorous shaking during reconstitution to preserve peptide integrity.
What to Expect
- Weeks 1-2: Initial subtle improvements in recovery from exercise may be reported.
- Weeks 2-4: More pronounced improvements in muscle soreness reduction and recovery time are commonly discussed.
- Weeks 4-6: Potential for enhanced muscle growth and strength, particularly when combined with resistance training, may be observed.
- Post-cycle: Continued benefits for some time after cessation due to its longer-acting nature.
- Individual responses may vary significantly based on research subject's training status, diet, and genetics.
Side Effects & Safety
| Effect | Frequency | Severity |
|---|---|---|
| Injection site irritation | Common | Mild |
| Headache | Uncommon | Mild |
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