IGF-1 LR3 Research Overview: Growth Factor Science

Peptide Profiles — 2026-04-10

IGF-1 LR3 (Long Arginine 3-IGF-1) is a modified version of insulin-like growth factor 1 that has become an important tool in cell biology and growth factor research. Its extended half-life and enhanced potency compared to native IGF-1 make it particularly useful for research applications.

What Is IGF-1 LR3?

IGF-1 LR3 is a synthetic analog of IGF-1 with two key modifications: - Substitution of arginine for glutamic acid at position 3 - Addition of 13 amino acids to the N-terminus

These modifications reduce binding to IGF-binding proteins (IGFBPs), resulting in a significantly longer half-life (20-30 hours vs. 12-15 minutes for native IGF-1) and greater bioavailability.

Mechanism of Action

IGF-1 LR3 exerts its effects primarily through the IGF-1 receptor (IGF-1R), triggering several downstream signaling cascades: - PI3K/Akt pathway — Promotes cell survival and growth - MAPK/ERK pathway — Stimulates cell proliferation - mTOR pathway — Enhances protein synthesis

Research Applications

Cell Culture IGF-1 LR3 is widely used as a supplement in cell culture media to promote cell growth and survival. Its reduced IGFBP binding makes it more effective than native IGF-1 in culture conditions.

Muscle Biology Research has explored IGF-1 LR3's effects on skeletal muscle: - Satellite cell activation and proliferation - Muscle fiber hypertrophy in animal models - Enhanced protein synthesis rates

Metabolic Research Studies have investigated IGF-1 LR3's metabolic effects: - Glucose uptake stimulation - Insulin sensitivity modulation - Fat metabolism regulation

Research Considerations

IGF-1 LR3 is a potent growth factor requiring careful handling: - Store at -20°C for long-term stability - Reconstitute with 0.1M acetic acid or bacteriostatic water - Use within manufacturer-recommended timeframes - Precise dosing is critical due to high potency

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