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The IGF axis and programmed cell death.

A J Butt1, S M Firth, R C Baxter

  • 1Kolling Institute of Medical Research, University of Sydney, Royal North Shore Hospital, St Leonards, New South Wales, Australia. abutt@med.usyd.edu.au

Immunology and Cell Biology
|June 11, 1999
PubMed
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The insulin-like growth factor (IGF) system regulates cell proliferation and survival. Emerging evidence suggests IGFs and their binding proteins also play complex roles in apoptosis, impacting cancer development.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Insulin-like growth factors (IGFs) are key regulators of cellular proliferation.
  • The IGF axis is increasingly recognized for its role in apoptosis.
  • IGF receptor signaling typically promotes cell survival.

Purpose of the Study:

  • To review the current understanding of the IGF system's role in apoptosis.
  • To explore the implications of IGF-mediated apoptosis in tumorigenesis.
  • To highlight the dual role of IGFs and their binding proteins in cell fate.

Main Methods:

  • Literature review of studies on IGFs, IGF binding proteins (IGFBPs), and apoptosis.
  • Analysis of signaling pathways involving IGF receptors and p53.
  • Synthesis of evidence regarding IGFBP-3's independent apoptotic functions.

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Main Results:

  • IGF signaling generally confers a survival advantage, protecting cells from apoptosis.
  • IGF binding proteins (IGFBPs) modulate IGF bioavailability, influencing IGF signaling.
  • IGFBP-3 may possess pro-apoptotic functions independent of IGF modulation.
  • The tumor suppressor p53 may influence apoptosis via the IGF axis.

Conclusions:

  • The IGF system has a complex, context-dependent role in regulating apoptosis.
  • Dysregulation of the IGF axis is implicated in cancer development.
  • Further research into IGFs, IGFBPs, and p53 interactions is crucial for understanding tumorigenesis.