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Bone blood flow and In vitro proliferation of bone marrow and trabecular bone osteoblast-like cells in ovariectomized rats

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Summary

Ovariectomy in the rat induces a rapid osteopenia associated with an elevated bone turnover. One hundred and twenty-day-old rats were ovariectomized (OVX) or sham-operated (n=6–8 per group and per time period studied). 45Ca accretion rate and bone blood flow (microspheres trapping technique) in the femurs were determined at 28, 42, 84, and 119 days after ovariectomy. Both parameters were markedly increased by 84 days and subsided thereafter. At the 42nd day, when bone turnover was maximal, bone marrow and trabecular bone cultures were obtained from shamoperated and ovariectomized animals (n=10/group). Proliferation rate of bone marrow cells and trabecular osteoblast-like cells estimated by fibroblast colony-forming units (FCFU) efficiency and cell counting was markedly increased in primary and secondary cultures in ovariectomy. These data fitted well with the enhanced number of osteoblasts observed in situ in the long bone metaphyses of estrogen-depleted animals. As estrogens were shown in the literature to inhibit proliferation of the red cell line and of other hemopoietic lines, it is possible that estrogens, through a general mechanism, inhibit hemopoietic and stromal lines and also the proliferation of bone marrow-derived trabecular bone cells.

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Authors and Affiliations

  1. Cliniques universitaires de Bruxelles, Université libre de Bruxelles, Brussels, Belgium

    Dominique Egrise, Dominique Martin, Pierre Neve, Anne Vienne, Michel Verhas & Andre Schoutens

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  1. Dominique Egrise
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  2. Dominique Martin
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  3. Pierre Neve
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  4. Anne Vienne
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  5. Michel Verhas
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  6. Andre Schoutens
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Egrise, D., Martin, D., Neve, P. et al. Bone blood flow and In vitro proliferation of bone marrow and trabecular bone osteoblast-like cells in ovariectomized rats. Calcif Tissue Int 50, 336–341 (1992). https://doi.org/10.1007/BF00301631

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  • DOI: https://doi.org/10.1007/BF00301631

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