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- W2003402857 abstract "Abstract Objective To examine the roles of STATs 1 and 3 in CCL2 production in human osteoblastic cells and their influences on arthritis development. Methods The expression of CCL2 in primary human osteoblasts and U2OS human osteoblastic cells was examined by Northern blotting and enzyme‐linked immunosorbent assay. The roles of STAT‐1/3 and c‐Fos were assessed using short hairpin RNAs (shRNA) to silence their functions. Serine phosphorylation of STATs was assessed by Western blotting. Promoter activities of c‐Fos and CCL2 were assessed by chloramphenicol acetyltransferase and luciferase assays, respectively. Interactions of STAT‐1, STAT‐3, and c‐Fos with DNA were evaluated by electrophoretic mobility shift assay (EMSA) and immunoprecipitation. The effect of the JAK inhibitor AG‐490 on collagen‐induced arthritis (CIA) in rats was examined using immunohistochemistry. Results Oncostatin M (OSM) stimulated CCL2 expression in primary human osteoblasts and U2OS cells. In U2OS cells, STAT‐1 and STAT‐3 were involved in OSM‐stimulated CCL2 expression, and both the phosphatidylinositol 3‐kinase/Akt and MEK/ERK pathways were implicated in the activation of these STATs. STAT‐1 and STAT‐3 modulated the expression of c‐Fos and directly transactivated the CCL2 promoter. Moreover, EMSA showed formation of a DNA–protein complex containing STAT‐1, STAT‐3, and interestingly, c‐Fos. Immunoprecipitation confirmed the binding between c‐Fos and STAT‐1/3. Reporter assay revealed synergistic attenuation of CCL2 promoter activity by shRNA targeting of STAT‐1, STAT‐3, and c‐Fos. AG‐490 suppressed OSM‐stimulated activation of STAT‐1/3 and synthesis of CCL2 in vitro and diminished the severity of CIA and the number of CCL2‐synthesizing osteoblasts in vivo. Conclusion These findings show that multiple levels of STAT‐1/3 signaling modulate OSM‐stimulated CCL2 expression in human osteoblastic cells. Clinically, this pathway may be related to the pathogenesis of arthritis." @default.
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- W2003402857 date "2009-04-29" @default.
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- W2003402857 title "Oncostatin M-induced CCL2 transcription in osteoblastic cells is mediated by multiple levels of STAT-1 and STAT-3 signaling: An implication for the pathogenesis of arthritis" @default.
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- W2003402857 doi "https://doi.org/10.1002/art.24452" @default.
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