Cited by 47Bone health and osteoporosis researchBone health and treatmentsBone Metabolism and Diseases

Higher doses of bisphosphonates further improve bone mass, architecture, and strength but not the tissue material properties in aged rats

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Shahnazari, Mohammad, Yao, Wei, Dai, WeiWei, Wang, Bob, Ionova-Martin, Sophi S., Ritchie, Robert O., Heeren, Daniel, Burghardt, Andrew J. +3 more·2010·Bone

Abstract

We report the results of a series of experiments designed to determine the effects of ibandronate (Ibn) and risedronate (Ris) on a number of bone quality parameters in aged osteopenic rats to explain how bone material and bone mass may be affected by the dose of bisphosphonates (BP) and contribute to their anti-fracture efficacy. Eighteen-month old female rats underwent either ovariectomy or sham surgery. The ovariectomized (OVX) groups were left untreated for 2 months to develop osteopenia. Treatments started at 20 months of age as follows: sham and OVX control (treated with saline), OVX + risedronate 30 and 90 (30 or 90 microg/kg/dose), and OVX + ibandronate 30 and 90 (30 or 90 microg/kg/dose). The treatments were given monthly for 4 months by subcutaneous injection. At sacrifice at 24 months of age the 4th lumbar vertebra was used for microCT scans (bone mass, architecture, and degree of mineralization of bone, DMB) and histomorphometry, and the 6th lumbar vertebra, tibia, and femur were collected for biomechanical testing to determine bone structural and material strength, cortical fracture toughness, and tissue elastic modulus. The compression testing of the vertebral bodies (LVB6) was simulated using finite-element analysis (FEA) to also estimate the bone structural stiffness. Both Ibn and Ris dose-dependently increased bone mass and improved vertebral bone microarchitecture and mechanical properties compared to OVX control. Estimates of vertebral maximum stress from FEA were correlated with vertebral maximum load (r=0.5, p<0.001) and maximum stress (r=0.4, p<0.005) measured experimentally. Tibial bone bending modulus and cortical strength increased compared to OVX with both BP but no dose-dependent effect was observed. DMB and elastic modulus of trabecular bone were improved with Ibn 30 compared to OVX but were not affected in other BP-treated groups. DMB of tibial cortical bone showed no change with BP treatments. The fracture toughness examined in midshaft femurs did not change with BP even with the higher doses. In summary, the anti-fracture efficacy of BP is largely due to their preservation of bone mass and while the higher doses further improve the bone structural properties do not improve the localized bone material characteristics such as tissue strength, elastic modulus, and cortical toughness.

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Crossref · 10.1016/j.bone.2009.11.019

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  • Prolonged bisphosphonate treatment may have an adverse effect on cortical bone mineralization and quality such that cortical strength declines independent of bone mass.

    “Prolonged bisphosphonates treatment may have an adverse effect on cortical bone mineralization and quality such that cortical strength decline independent of bone mass [54].”

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  1. [42]Cheng Z Yao W Zimmermann EA Busse C Ritchie RO Lane NE 2008 Prolonged Treatments with Anti-Resorptive Agents and PTH Have Different Effects on Bone Strength and the Degree of Mineralization in Old Estrogen Deficient Osteoporotic Rats J Bone Miner Res PMC3276355 18847326

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Authors
Shahnazari, M., Yao, W., Dai, W., Wang, B., Ionova-Martin, S. S., Ritchie, R. O., Heeren, D., Burghardt, A. J., Nicolella, D. P., Kimiecik, M. G., & Lane, N. E.
Affiliations
  • University of California Davis Medical Center (US)
  • Lawrence Berkeley National Laboratory (US)
  • University of California, San Francisco (US)
  • Southwest Research Institute (US)
Corresponding author
Lane, Nancy E.
Venue
Bone
Publisher
Elsevier BV
Published
2010-05
Volume
46
Issue
5
Pages
1267-1274
ISSN
  • 1873-2763 (ISSN-L)
  • 8756-3282
OpenAlex
W2039496643
Cited by
46
References
67
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2021: 1 · 2020: 3 · 2019: 3 · 2018: 3 · 2017: 3 · 2016: 4 · 2015: 3 · 2014: 4 · 2013: 4 · 2012: 5
FWCI
4.20
Type
journal article
Language
en
Open access
Locations
  • Bone (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (AR043052-07, AR-048841, 1K12HD05195801)
Topics
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Health Sciences › Medicine › Oncology › Bone health and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
Keywords
bisphosphonates, ibandronate, risedronate, dose-response relationship, bone quality, bone mass, bone microarchitecture, bone mineralization, bone strength, fracture toughness, elastic modulus, trabecular bone, cortical bone, osteopenia, ovariectomy, aging, vertebral biomechanics, finite element analysis, lumbar vertebrae
MeSH terms
Aging, Animals, Bone and Bones, Bone Diseases, Metabolic, Diphosphonates, Female, Lumbar Vertebrae, Ovariectomy, Rats, Inbred F344, Compressive Strength, Finite Element Analysis, Bone Density Conservation Agents, Rats

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