Calcified Tissue International

, Volume 91, Issue 6, pp 440–449

Temporal Changes in Bone Composition, Architecture, and Strength Following Estrogen Deficiency in Osteoporosis

  • Orlaith Brennan
  • Julia S. Kuliwaba
  • T. Clive Lee
  • Ian H. Parkinson
  • Nicola L. Fazzalari
  • Laoise M. McNamara
  • Fergal J. O’Brien
Original Research

Abstract

Using an ovariectomized (OVX) ovine model, we provide an analysis of the timing of changes in bone following estrogen deficiency. The expression of genes known to regulate osteoclastogenesis, matrix production, and mineralization, as measured by real-time RT-PCR, was significantly increased by 12 months; and increased expression was maintained through to 31 months post-OVX compared to controls. FTIR spectroscopy confirmed that mineralized crystals were less mature than in controls 12 months post-OVX and were even less so by 31 months. The mineral-to-matrix ratio was significantly reduced by 31 months, while the ratio of mature to immature collagen cross-linking was initially increased at 12 months and subsequently reduced at 31 months post-OVX. In contrast, trabecular number, thickness, and separation were unchanged at 12 months. Significant reductions in trabecular number and thickness and a significant increase in trabecular separation were observed 31 months after OVX. Most notably perhaps these combined changes led to a significant reduction in the compressive strength of trabecular bone after 31 months. The results indicate that there is an initial increase in bone turnover, which is accompanied by a change in bone composition. This is followed by a continued increase in bone resorption and relative reduction in bone formation, leading to deterioration in bone microarchitecture. Ultimately, these cumulative changes led to a significant reduction in the compressive strength of bones following 31 months of estrogen deficiency. These findings provide important insight into the time sequence of changes during osteoporosis.

Keywords

Osteoporosis Microarchitecture Bone composition Biomechanical property Animal model 

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Orlaith Brennan
    • 1
    • 2
    • 3
  • Julia S. Kuliwaba
    • 3
    • 4
  • T. Clive Lee
    • 1
    • 2
  • Ian H. Parkinson
    • 3
    • 4
  • Nicola L. Fazzalari
    • 3
    • 4
  • Laoise M. McNamara
    • 5
  • Fergal J. O’Brien
    • 1
    • 2
  1. 1.Department of AnatomyRoyal College of Surgeons in IrelandDublin 2Ireland
  2. 2.Trinity Centre for BioengineeringTrinity College DublinDublin 2Ireland
  3. 3.Bone and Joint Research LaboratorySA Pathology and Hanson InstituteAdelaideAustralia
  4. 4.Discipline of Anatomy and PathologyThe University of AdelaideAdelaideAustralia
  5. 5.Department of Mechanical and Biomedical EngineeringNational University of Ireland GalwayGalwayIreland

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