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Related Experiment Videos

Insulin-like growth factor (IGF) and bone.

T L McCarthy1, M Centrella, E Canalis

  • 1Department of Medicine, Saint Francis Hospital & Medical Center, Hartford, CT.

Connective Tissue Research
|January 1, 1989
PubMed
Summary
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Bone growth factors, insulin-like growth factors I and II (IGF-I and IGF-II), stimulate bone cell growth and protein synthesis. Both IGF-I and IGF-II reduce collagen breakdown in bone tissue.

Area of Science:

  • Biochemistry
  • Bone Biology
  • Growth Factor Research

Background:

  • Bone synthesizes and retains growth factors like IGF-I and IGF-II.
  • Bone tissue is highly responsive to growth-promoting agents.

Purpose of the Study:

  • To investigate the effects of IGF-I and IGF-II on bone cell synthesis and degradation.
  • To compare the differential sensitivities of bone explants to IGF-I and IGF-II.

Main Methods:

  • Cultured calvariae (bone explants) were treated with IGF-I and IGF-II.
  • Assessed DNA, collagen, and noncollagenous protein synthesis.
  • Measured collagen degradation rates.

Main Results:

  • Both IGF-I and IGF-II stimulated DNA, collagen, and noncollagenous protein synthesis in cultured calvariae.

Related Experiment Videos

  • Calvariae exhibited quantitative differential sensitivities to IGF-I and IGF-II.
  • IGF-I and IGF-II treatment decreased collagen degradation.

    • Conclusions:

    • IGF-I and IGF-II play significant roles in regulating bone metabolism.
    • Differential sensitivities to IGFs suggest specific roles in bone remodeling.
    • These growth factors not only promote bone formation but also inhibit bone resorption.