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Bisphosphonates alter trabecular bone collagen cross-linking and isomerization in beagle dog vertebra

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Abstract

Summary

Changes in organic matrix may contribute to the anti-fracture efficacy of anti-remodeling agents. Following one year of treatment in beagle dogs, bisphosphonates alter the organic matrix of vertebral trabecular bone, while raloxifene had no effect. These results show that pharmacological suppression of turnover alters the organic matrix component of bone.

Introduction

The collagen matrix contributes significantly to a bone’s fracture resistance yet the effects of anti-remodeling agents on collagen properties are unclear. The goal of this study was to assess changes in collagen cross-linking and isomerization following anti-remodeling treatment.

Methods

Skeletally mature female beagles were treated for one year with oral doses of vehicle (VEH), risedronate (RIS; 3 doses), alendronate (ALN; 3 doses), or raloxifene (RAL; 2 doses). The middle dose of RIS and ALN and the lower dose of RAL approximate doses used for treatment of post menopausal osteoporosis. Vertebral trabecular bone matrix was assessed for collagen isomerization (ratio of α/β C-telopeptide [CTX]), enzymatic (pyridinoline [PYD] and deoxypyridinoline [DPD]), and non-enzymatic (pentosidine [PEN]) cross-links.

Results

All doses of both RIS and ALN increased PEN (+34–58%) and the ratio of PYD/DPD (+14–26%), and decreased the ratio of α/β CTX (−29–56%) compared to VEH. RAL did not alter any collagen parameters. Bone turnover rate was significantly correlated to PEN (R = −0.664), α/β CTX (R = 0.586), and PYD/DPD (R = −0.470).

Conclusions

Bisphosphonate treatment significantly alters properties of bone collagen suggesting a contribution of the organic matrix to the anti-fracture efficacy of this drug class.

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Acknowledgements

The authors thank Dr. Keith Condon, Diana Jacob, Mary Hooser, and Lauren Waugh for histological preparation. This work was supported by NIH Grants AR047838 and AR007581 and research grants from The Alliance for Better Bone Health (Procter & Gamble Pharmaceuticals and sanofi-aventis), and Lilly Research Laboratories, as well as an unrestricted grant from Eli Lilly to INSERM. Merck and Co. kindly provided the alendronate. This investigation utilized an animal facility constructed with support from Research Facilities Improvement Program Grant Number C06 RR10601-01 from the National Center for Research Resources, National Institutes of Health.

Conflict of interest statement

Matthew R. Allen has current research funding from Eli Lilly, Amgen, and the Alliance for Better Bone Health.

Diana Julie Leeming is a full-time employee of Nordic Bioscience.

David B. Burr has research funding from the Alliance for Better Bone Health, Eli Lilly and Co., and Amgen. He serves as a consultant and speaker for Procter and Gamble Pharmaceuticals and for Eli Lilly and Company.

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Authors and Affiliations

  1. Department of Anatomy and Cell Biology, MS 5035, Indiana University School of Medicine, 635 Barnhill Dr., Indianapolis, IN, 46202, USA

    M. R. Allen & D. B. Burr

  2. Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, USA

    D. B. Burr

  3. Department of Biomedical Engineering, Indiana University-Purdue University at Indianapolis, Indianapolis, IN, USA

    D. B. Burr

  4. INSERM Unit 403 and Université Claude Bernard Lyon1, Lyon, France

    E. Gineyts & P. D. Delmas

  5. Nordic Bioscience Diagnostics, Herlev, Denmark

    D. J. Leeming

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  1. M. R. Allen
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Correspondence to M. R. Allen.

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Allen, M.R., Gineyts, E., Leeming, D.J. et al. Bisphosphonates alter trabecular bone collagen cross-linking and isomerization in beagle dog vertebra. Osteoporos Int 19, 329–337 (2008). https://doi.org/10.1007/s00198-007-0533-7

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  • DOI: https://doi.org/10.1007/s00198-007-0533-7

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