Inhibitory effect PLE0 on RANKL-induced expression of c-Fos and NFATc1 in BMMs. (A,B) BMMs were treated with PLE0 (25 mg/mL, -●-) or vehicle (-○-) in the presence of M-CSF (60 ng/mL) and RANKL (100 ng/mL) on the various days of incubation. (A) Whole-cell extracts were subjected to Western blot analysis with specific antibodies as indicated; (B) Total RNA was isolated at the indicated time points and mRNA expression of NFATc1, c-Fos, TRAP, ATPv0d2, cathepsin K, and DC-STAMP was analyzed using real-time quantitative PCR. PCR data are represented as mean ± SEM and were analyzed with a one-way analysis of variance (ANOVA) test and Dunnett’s post hoc test. *, p < 0.05 versus no PLE0 treatment. **, p < 0.01 versus no PLE0 treatment. ***, p < 0.001 versus no PLE0 treatment.