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IGFBP-3. Functional and structural implications in aging and wasting syndromes
1Department of Medicine, State University of New York, Stony Brook. MGelato@epo.som.sunysb.edu
Endocrine
|August 1, 1997
Summary
Aging and catabolic conditions like AIDS and diabetes alter insulin-like growth factors (IGFs) and their binding proteins (IGFBPs). These changes in IGFs and IGFBPs contribute to reduced growth and increased tissue breakdown.
Area of Science:
- Endocrinology
- Metabolism
- Aging Research
Background:
- Insulin-like growth factors (IGFs) and their binding proteins (IGFBPs) play crucial roles in cellular growth and metabolism.
- Circulating levels and physical states of IGFs and IGFBPs are altered in various clinical conditions, including aging and catabolic states.
Purpose of the Study:
- To investigate the characteristic patterns of IGFs and IGFBPs in aging and catabolic conditions.
- To understand the implications of these alterations on anabolic activity and catabolism.
Main Methods:
- Serum analysis of IGF-I, IGF-II, IGFBP-1, and IGFBP-3 levels.
- Ligand blotting and IGFBP-3 proteolysis assays.
- Native gel electrophoresis to assess IGFBP-1 phosphorylation and ternary complex integrity.
Main Results:
- Aging is associated with decreased IGF-I/II, normal IGFBP-3, and increased IGFBP-1 (highly phosphorylated).
- Catabolic conditions (AIDS, diabetes, trauma, burns) show decreased IGF-I/II and IGFBP-3, increased IGFBP-1 (highly phosphorylated), and IGFBP-3 proteolysis.
- Disruption of the IGF ternary complex with decreased ALS levels observed in AIDS and burns.
Conclusions:
- Altered circulating IGF and IGFBP profiles are characteristic of aging and catabolic states.
- Changes in IGFs and IGFBPs, including proteolysis and altered phosphorylation, likely contribute to reduced anabolism and increased catabolism/wasting.