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Figure 3 | Arthritis Research & Therapy

Figure 3

From: CCAAT/enhancer-binding protein β promotes receptor activator of nuclear factor-kappa-B ligand (RANKL) expression and osteoclast formation in the synovium in rheumatoid arthritis

Figure 3

Osteoclast formation from peripheral blood mononuclear cells (PBMC) is promoted by the enhanced expression of C/EBPβ in fibroblast-like synoviocytes from the synovium of rheumatoid arthritis patients (RA-FLS). (A) Co-cultures of PBMCs and RA-FLS transfected with adenovirus vectors expressing C/EBPβ-LAP, −LIP or LacZ control for 72 hours. Number of TRAP-positive multinucleated cells recognized in the co-culture system. Osteoclasts were identified as TRAP-positive multinucleated cells that contained more than three nuclei. Original magnification, 100×. *P <0.05 versus control using the Mann-Whitney U-test. (B) Negative control for the co-culture experiments. PBMC or RA-FLS over-expressing C/EBPβ-LAP, −LIP or LacZ control, respectively, were cultured for 72 hours. No TRAP-positive multinucleated cells were observed.

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Arthritis Research & Therapy

ISSN: 1478-6362

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