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Related Experiment Videos

Insulin-like growth factor-binding protein-5 induces a gender-related decrease in bone mineral density in transgenic

Dervis A M Salih1, Subburaman Mohan, Yuji Kasukawa

  • 1Laboratory of Molecular Signaling, The Babraham Institute, Cambridge, United Kingdom CB2 4AT.

Endocrinology
|November 20, 2004
PubMed
Summary
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Overexpressing IGF-binding protein-5 (IGFBP-5) in mice unexpectedly reduced bone mineral density (BMD), particularly in males. This highlights IGFBP-5

Area of Science:

  • Skeletal biology and bone metabolism research.
  • Endocrinology and molecular genetics.
  • Osteoporosis and bone health.

Background:

  • IGF-binding protein-5 (IGFBP-5) is crucial for skeletal development and its levels decline in osteoporosis.
  • IGFBP-5 influences bone formation through both insulin-like growth factor (IGF)-dependent and independent pathways.
  • Previous studies suggest a positive role for IGFBP-5 in bone health.

Purpose of the Study:

  • To investigate the in vivo role of IGFBP-5 in bone mineral density (BMD) acquisition and maintenance.
  • To determine if IGFBP-5 overexpression impacts skeletal development and bone metabolism.
  • To explore the gender-specific effects of IGFBP-5 on bone health.

Main Methods:

  • Generation of transgenic (Tg) mice overexpressing Igfbp5 using the CMV/betaA promoter.

Related Experiment Videos

  • Measurement of serum IGFBP-5 concentrations in Tg and wild-type mice.
  • Assessment of BMD using dual-energy x-ray absorptiometry (DXA) and peripheral quantitative computed tomography (pQCT).
  • Histomorphometric analysis of bone formation and remodeling at periosteal and endosteal surfaces.

    • Main Results:

    • Tg mice exhibited significantly elevated serum IGFBP-5 levels.
    • BMD was reduced in Tg mice in a gender-dependent manner, with males more severely affected than females.
    • Histomorphometry indicated opposing effects of IGFBP-5 on periosteal and endosteal bone formation.
    • Findings suggest IGF-independent actions of IGFBP-5 in bone.

    Conclusions:

    • IGFBP-5 plays a significant, gender- and age-dependent role in BMD acquisition and maintenance.
    • Overexpression of IGFBP-5 can lead to decreased BMD, challenging previous assumptions.
    • This study provides the first in vivo genetic evidence for IGF-independent functions of IGFBP-5 in bone.
    • Results have implications for understanding osteoporosis, particularly its gender-biased progression.