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Comparisons were made using one-way ANOVA. All experiments were repeated at least three times, and representative experiments are shown. Differences were considered significant at p? http://www.selleck.cn/products/BKM-120.html luciferase reporter assay, mice, micro�Ccomputed tomography (?CT) analysis, histomorphometric analysis, and biochemical analysis are documented in the Supplemental Materials (Supplemental Tables S1�CS3 and Figs. S1�CS4). To investigate the miRNA expression profile during osteoclastogenesis, microarray assays were performed. CD14+ PBMCs from young healthy volunteers were induced to osteoclastogenesis by treatment with M-CSF?+?RANKL. CD14+ PBMCs from the same subject were cultured without M-CSF?+?RANKL as controls. Our results showed that 27 miRNAs were differently expressed during the differentiation of PBMCs into osteoclasts (Fig. 1A, Supplemental Table S1). Also, hsa-miR-148a, hsa-miR-483, http://www.selleckchem.com/products/Y-27632.html hsa-miR-223, hsa-miR-21, and hsa-miR-214 were upregulated. Conversely, hsa-miR-155, hsa-miR-125a, hsa-miR-27b, hsa-miR-145 were downregulated. The results of real-time PCR were consistent with that of miRNA microarray (Fig. 1B). As the most dramatically upregulated miRNA, we chose to study miR-148a and investigated its expression pattern during osteoclast differentiation. Northern blot showed miR-148a started to be expressed on 5 days in CD14+ PBMCs after treatment with M-CSF?+?RANKL and increased progressively. On day 15 after induction, the expression of miR-148a reached the maximum (Fig. 1C). Theses results suggested that miR-148a plays important roles in osteoclast differentiation. To investigate the role of miR-148 during osteoclast differentiation, PBMCs were transfected with the miRNA precursor (pre-miR-148a) and the level of mature miR-148a was assessed by Northern blotting (Fig. 2A). After treatment with M-CSF?+?RANKL for 6 days, osteoclast formation was investigated. Nuclear http://www.selleckchem.com/products/chir-99021-ct99021-hcl.html factor of activated T-cells cytoplasmic (NFATc1) and TRAP were used as reliable markers of osteoclasts.16, 17 Our results showed that after pre-miR-148a transfection, TRAP+ multinucleated giant cells (Fig. 2B), TRAP activity and expression, and NFATc1 expression (Fig. 2C, D) increased significantly. Conversely, 2��-O-methyl antisense inhibitory oligoribonucleotides (anti-miR-148a), a proven effective blocker of miR-148a, inhibited osteoclastogenesis significantly (Fig. 2B�CD). Furthermore, we transfected the CD14+ PBMCs with pre-miR-148a adenoviral vector. Our results showed that after treatment with M-CSF?+?RANKL for 15 days, overexpression of miR-148a significantly increased the bone resorption area on dentin slices (Fig. 2E), indicating that miR-148a also regulates osteoclast differentiation at this late stage. We also investigated the role of miR-148a in osteoclastogenesis of bone marrow cells from mice.