The IGF-1 pathway sits downstream of many GH-axis discussions. IGF-1 binds the IGF-1 receptor tyrosine kinase and drives PI3K/AKT and MAPK outputs associated with growth and survival signaling.
What it is
IGF-1 is a peptide growth factor produced largely in the liver under GH influence, with additional local production in other tissues. The IGF-1 pathway describes receptor activation and the kinase networks that follow.
How it works
IGF-1 binds IGF1R, triggering autophosphorylation and recruitment of IRS adaptor proteins. PI3K/AKT and RAS–MAPK cascades then modulate metabolism, protein synthesis cues, and cell-cycle regulators.
IGF-binding proteins in circulation and tissue microenvironments shape bioavailability, so measured IGF-1 levels do not equal free receptor engagement.
Biological role
Across development and adult physiology, IGF-1 signaling is intertwined with growth, tissue maintenance, and metabolic coordination. Research literature carefully distinguishes endocrine IGF-1 from autocrine/paracrine actions.
Proteins involved
- IGF-1
- IGF-1 receptor (IGF1R)
- IRS-1 / IRS-2
- PI3K
- AKT
- MAPK pathway components
Research summary
Mechanistic and translational papers map IGF1R signaling architecture and its crosstalk with insulin receptor pathways. Educational crossover content should avoid equating pathway activation with clinical benefit.
Descriptions summarize published mechanistic frameworks. Findings from cell culture or animal models should not be interpreted as proven clinical effects in humans.
Research limitations
Scientific references
- LeRoith D, Yakar S. Mechanisms of disease: metabolic effects of growth hormone and IGF-1. Nat Clin Pract Endocrinol Metab.
- Annunziata M et al. IGF system reviews in endocrine journals.