Fos plays an essential role in the upregulation of RANK expression in osteoclast precursors within the bone microenvironment

Journal of Cell Science
Atsushi AraiNaoyuki Takahashi

Abstract

Fos plays essential roles in the osteoclastic differentiation of precursor cells generated by colony-stimulating factor 1 (CSF-1) and receptor activator of NF-κB ligand (RANKL; also known as tumor necrosis factor ligand superfamily member 11, Tnsf11). RANKL-deficient (RANKL(-/-)) mice and Fos(-/-) mice exhibit osteopetrosis due to an osteoclast deficiency. We previously reported that RANK-positive osteoclast precursors are present in bone of RANKL(-/-) mice but not Fos(-/-) mice. Here we report the role of Fos in RANK expression in osteoclast precursors. Medullary thymic epithelial cells and intestinal antigen-sampling microfold cells have been shown to express RANK. High expression of RANK was observed in some epithelial cells in the thymic medulla and intestine but not in osteoclast precursors in Fos(-/-) mice. RANK mRNA and protein levels in bone were lower in Fos(-/-) mice than RANKL(-/-) mice, suggesting that Fos-regulated RANK expression is tissue specific. When wild-type bone marrow cells were inoculated into Fos(-/-) mice, RANK-positive cells appeared along bones. RANK expression in wild-type macrophages was upregulated by coculturing with RANKL(-/-) osteoblasts as well as wild-type osteoblasts, suggesting that cytokine...Continue Reading

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