By R. De Marneffe (auth.), A. Schoutens, J. Arlet, J. W. M. Gardeniers, S. P. F. Hughes (eds.)
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Extra resources for Bone Circulation and Vascularization in Normal and Pathological Conditions
The interesting point here, however, is that vitamin D3 depletion did not distort or disrupt the metaphyseal circulation. Rather, metaphyseal vessels matured and established a fully developed closed nutritional type of circulation, resulting in deficient osteogenesis. Endothelial invasivity and, consequently, osteogenesis were immediately and completely restored with vitamin D3 repletion. The precise mode of action of vitamin D3 in this process has not been elucidated, but it seems clear from this experiment that vascular invasivity is critical to osteogenesis.
1990) using immunocytochemical methods which localised laminin and other basement membrane components have demonstrated vessel-like structures in the callus cartilage. These findings have not yet been corroborated. Immunocytochemical methods have now become available which may be used to exclusively label endothelial cells and their progeny. , 1982; Walker 1985). There are available monoclonal antibodies specifically raised against endothelial cell proteins (Pringle and de Bono, 1988). These methods have been used in this study to investigate the origins of the fracture callus.
RESULTS In the HE sections, areas of endochondral ossification were observed adjacent to areas of intramembranous ossification. The reasons for the divergent differentiation pathways were not apparent. Lectin Binding Study Positive binding was observed only in the human specimens stained with UEP. In these specimens, lectin activity was restricted to the vascular structures and to red blood cells. No other cell types were stained. Clear and consistent results were obtained with no background staining.