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S2A), and osteoblast activity and expression of osteoblast differentiation markers in CD11b-deficient mice were comparable to those of control mice in vitro (Supplemental http://www.selleckchem.com/products/Adriamycin.html Fig. S2B,C). Thus, the decreased osteoblast activity in vivo in CD11b-deficient mice is unlikely to have resulted from an intrinsic osteoblast defect but instead may reflect uncoupling of osteoclast and osteoblast function, although this notion needs to be further investigated. Collectively, these results show that CD11b-deficient mice show increased osteoclastogenesis and decreased bone formation at an early age (8 weeks) that results in a clear low bone mass phenotype at 12 weeks of age. The results suggest that CD11b is a negative regulator of osteoclastogenesis. We wished to corroborate a negative role for http://www.selleckchem.com/PD-1-PD-L1.html CD11b in osteoclastogenesis by activating CD11b signaling in a complementary gain-of-function approach. We activated CD11b signaling in mouse bone marrow-derived osteoclast precursors using the well-defined CD11b ligand Fb and the standard approach of adding cells to plates coated with Fb versus control plates coated with serum.28 Immobilized Fb undergoes a conformational change that reveals the binding epitope present in fibrin, which is present in inflamed tissues and inflammatory exudates.28 Treatment with Fb nearly completely and significantly (p? http://www.selleck.cn/products/MK-1775.html Fig. S3A,B), further supporting a role of CD11b signaling in the inhibition of osteoclastogenesis. Fb strongly suppressed RANKL-induced expression of osteoclast-related genes such as cathepsin K and ��3 integrin (Fig. 2B). These results show that Fb, a ligand for CD11b, strongly inhibits RANKL-induced osteoclastogenesis by acting directly on OCPs. To confirm that Fb was signaling through CD11b we performed experiments using CD11b-deficient OCPs. Deficiency of CD11b resulted in a minimal increase in RANKL-induced osteoclastogenesis (Fig. 2C), likely because CD11b signaling is not induced under these in vitro culture conditions in the absence of exogenous ligands. Fb-induced suppression of osteoclastogenesis was partially reversed in CD11b-deficient cells (Fig. 2C), suggesting that Fb engages additional receptors that generate inhibitory signals that cooperate with CD11b signaling to inhibit osteoclastogenesis.