Figure 7. NMN and SRT 1720 promoted osteogenic differentiation after LPS treatment. Cells were cultured in 100 μM NMN or 5 μM SRT 1720 with 100 ng/mL LPS for 7 days. (A) ELISA results showing the IL-6 levels. (B) ALP activity and (C) ALP staining were increased after incubation with SRT 1720. (D) Western blot results showing the protein expression of Nampt, Sirt1, p-NF-κB p65, Runx2, Col1a1 and OCN. The data are expressed as the mean ± SD. *, p<0.05; **, p<0.01.