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Insulin-like growth factor binding proteins: new proteins, new functions
R J Ferry1, R W Cerri, P Cohen
1Division of Endocrinology/Diabetes, Department of Pediatrics, The Children's Hospital of Philadelphia and The University of Pennsylvania, Philadelphia, PA, USA.
Hormone Research
|June 3, 1999
Summary
The insulin-like growth factors (IGFs) and their binding proteins (IGFBPs) are crucial for growth and cell proliferation. Their complex interactions also influence diseases like cancer and diabetes.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- Insulin-like growth factors (IGFs) are key regulators of somatic growth and cellular proliferation.
- IGF binding proteins (IGFBPs) modulate IGF availability and actions, acting as both high-affinity binders and independent regulators of cell growth.
- IGFBP proteases and IGFBP-related proteins (IGFBP-rPs) further add complexity to the IGF system, influencing cell growth and differentiation.
Purpose of the Study:
- To review the complex roles of the growth hormone (GH)-IGF-IGFBP axis in regulating biological processes.
- To highlight the emerging understanding of IGFBPs as independent regulators of cell growth.
- To discuss the significance of IGFBP proteases and IGFBP-rPs in modulating IGF actions.
Main Methods:
- Literature review and synthesis of existing research on the GH-IGF-IGFBP axis.
- Analysis of the molecular mechanisms underlying IGF and IGFBP interactions.
- Examination of the physiological and pathological implications of this axis.
Main Results:
- The GH-IGF-IGFBP axis is a complex and powerful regulatory system.
- Free IGF availability, controlled by IGFBPs and their proteases, is critical for IGF receptor interaction and mitogenic activity.
- IGFBPs exhibit IGF-independent functions, impacting cell growth and differentiation.
Conclusions:
- The intricate interplay between IGFs, IGFBPs, and related proteins is fundamental to cell biology.
- Understanding this axis offers potential therapeutic strategies for diseases such as cancer and diabetes mellitus.
- Further research into the physiology of the GH-IGF-IGFBP axis promises significant advancements in understanding cell biology and disease treatment.