Storage Stability
Mechanism of Action
No IGFBP Binding
Full-length IGF-1 is 99% bound to IGF-binding proteins in circulation, which regulate its bioavailability. DES lacks the N-terminal tripeptide that IGFBPs recognize, so it circulates and acts in free form, explaining its dramatically higher potency at the receptor level.IGF-1R Activation
DES binds the IGF-1 receptor with similar or slightly lower intrinsic affinity than IGF-1, but its free (unbound) state means far more receptor engagement per mole administered.Localized vs. Systemic
Due to its short half-life, DES acts locally when injected intramuscularly. Unlike IGF-1 LR3 (which circulates systemically for hours), DES primarily affects the injection site tissue, making it the choice for localized muscle research.Research Summary
Muscle Hypertrophy (Local)
In rodent studies, intramuscular IGF-1 DES injection promotes local satellite cell activation and muscle fiber hypertrophy at the injection site with minimal systemic effects.CNS Activity
IGF-1 DES is the predominant IGF-1 form in the brain (produced locally by neurons and glia). It plays roles in neuronal survival, synaptogenesis, and myelination, distinct from peripherally-acting IGF-1.Potency Comparison
In cell culture assays, DES is ~5-10x more potent than IGF-1 LR3 at stimulating myoblast proliferation, reflecting the IGFBP-free advantage.Research Protocols
Reconstitution
Critical: IGF-1 DES must be reconstituted with dilute acetic acid (0.1-1% acetic acid or AA solution), not BAC water or sterile water. Alkaline or neutral pH denatures the peptide. Add acetic acid first, then dilute with sterile saline.Dosing
50-100 µg intramuscularly into target muscle, 1-2x daily. Dose immediately pre- or post-workout for muscle hypertrophy research.Cycle
4-8 weeks. Longer cycles risk receptor desensitization and IGF-1R downregulation.Storage & Handling
Store lyophilized at -20°C. Reconstitute with 0.1% acetic acid, NOT bacteriostatic water. After reconstitution, store at 2-8°C and use within 2-3 weeks. Do not freeze reconstituted solution. Acetic acid reconstitution maintains peptide integrity at refrigerator temperatures.
References
- [1]Francis GL, et al. "Des(1-3)IGF-1: a truncated form of insulin-like growth factor-I." Biochem J, 1992.
- [2]Ballard FJ, et al. "Production and role of IGF binding protein-4 in cells." J Cell Physiol, 1996.
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