Abstract
The interactions of the cells in the bone microenvironment play important roles in bone remodeling. Osteoblasts are involved in the bone remodeling through the production of soluble factors that regulate proliferation and differentiation of osteoclasts and through cell–cell interactions. Histological studies have suggested that endothelial cells are also associated with some osteolytic bone diseases. However, it is still unclear how endothelial cells contribute to bone resorption. We established bone-derived endothelial cells (BDECs) to study their roles in bone remodeling. The established BDECs promoted bone resorption in a murine neonatal calvaria organ culture system by secreting a soluble bone resorption-inducing factor(s) when stimulated by several inflammatory cytokines. This bone resorption-inducing factor was identified as interleukin-11 (IL-11). IL-11 is known to enhance bone resorption by promoting osteoclastogenesis and by suppressing the activity of osteoblasts. The production of IL-11 in BDECs was also promoted by conditioned medium of human melanoma A375M cells. Because A375M cells formed osteolytic bone metastasis in vivo, BDECs might be involved in pathological osteolysis by producing IL-11. These results suggest that endothelial cells in bone play important roles in the promotion of bone resorption by secreting IL-11 in physiological and pathological conditions.
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Zhang, Y., Fujita, N., Oh-hara, T. et al. Production of interleukin-11 in bone-derived endothelial cells and its role in the formation of osteolytic bone metastasis. Oncogene 16, 693–703 (1998). https://doi.org/10.1038/sj.onc.1201581
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DOI: https://doi.org/10.1038/sj.onc.1201581
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