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Protracted Systemic Changes in Bone Biology after Segmented Unloading in the Rat

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Abstract

To investigate whether the decreased bone formation observed in most experimental situations of disuse was caused by an increased inhibition by the bone microenvironment of osteoblast (OB) proliferation, we studied the inhibiting power on ROS 17/2.8 proliferation of the bone marrow extracellular fluid (IPEF) in loaded and unloaded bones of rats submitted to two situations of partial disuse: tail suspension (TS) for 3 days to 2 weeks and around the knee tenectomy (KT) for 2–10 weeks. Histomorphometric parameters and osteoblast precursors dynamics were studied in parallel. Bone volume was lost in the unloaded bones, but not in loaded bones, in both experimental situations. Bone formation was low at early times (7 - 14 days) in TS rats. However, in KT at later times (4 - 10 weeks), the osteoblastic index of the unloaded tibia was increased. IPEF was not increased in the unloaded bones 3–7 days after TS. It was decreased later in the course of unloading (after 2 weeks of TS and 2–10 weeks after KT). This decrease was observed in the loaded bones as well. Unexpectedly, we also found that the number of FCFUs was decreased in both loaded and unloaded limbs in TS and KT, and that the yield of cells obtained in primary culture from tibial metaphysis was decreased in both tibiae from KT animals. These data show that an increased IPEF does not play a role in the early inhibition of bone formation responsible for the loss of bone after unloading in the TS model. Its later decrease could be permissive for the increased osteoblastic index observed in the KT model. They also show that, contrary to the usual assumptions, bone biology is changed all over the skeleton after partial unloading, even if the changes result in bone loss in the unloaded bones only. Thus, as yet, unidentified systemic factors probably superimpose on the local factors that control bone volume.

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Acknowledgements

We gratefully acknowledge Catherine André, Xavier Butigieg, Isabelle Drouet, Bernard Hauquier, Dominique Martin, and Sylvie Renault for their excellent technical help. This work was supported partly by a grant from Université Libre de Bruxelles and by the convention N° 3.4575.01 from Fonds de la Recherche Scientifique Médicale Belge (FRSM).

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Authors and Affiliations

  1. Cliniques Universitaires de l’Université Libre de Bruxelles, Belgium

    D. Egrise, M. Hinsenkamp, A. Schoutens & P. Bergmann

  2. Department of Aerospace Physiology, IMASSA-CERMA, Bretigny sur Orge, France

    X. Holy, L. Begot & E. Zerath

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  1. D. Egrise
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  2. X. Holy
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  3. M. Hinsenkamp
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  7. E. Zerath
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Correspondence to D. Egrise.

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Egrise, D., Holy, X., Hinsenkamp, M. et al. Protracted Systemic Changes in Bone Biology after Segmented Unloading in the Rat . Calcif Tissue Int 73, 56–65 (2003). https://doi.org/10.1007/s00223-002-2085-3

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  • DOI: https://doi.org/10.1007/s00223-002-2085-3

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