Add time:09/10/2019 Source:sciencedirect.com
psoralidin (cas 18642-23-4) is a metabolic product from the seed of psoraleacorylifolia, possessed anti-inflammatory and immunomodulatory effects. We speculated that psoralidin might impact osteoclastogenesis and bone loss. By using both in vitro and in vivo studies, we observed psoralidin strongly inhibited RANKL induced osteoclast formation during preosteoclast cultures, suggesting that it acts on osteoclast precursors to inhibit RANKL/RANK signaling. At the molecular level, by using MAPKs specific inhibitors (U-0126, SB-203580 and SP-600125) we demonstrated that psoralidin markedly abrogated the phosphorylation of p38, ERK, JNK. Moreover, the RANKL induced NF-κB/p65 phosphorylation and I-κB degradation were significantly inhibited by psoralidin. Further, psoralidin significantly suppressed osteoclastogenesis marker genes of TRAP, Cathepsin K and OSCAR. These were accompanied by the decreased expression of c-Fos and NFATc1 transcription factors. Consistent with in vitro results, our in vivo and serologic studies showed psoralidin inhibited lipopolysaccharide induced bone resorption by suppressing the inflammatory cytokines: TNF-α and IL-6 expression, as well as the ratio of RNAKL : OPG. These results collectively suggested that psoralidin could represent a novel therapeutic strategy for osteoclast-related disorders, such as rheumatoid arthritis and postmenopausal osteoporosis.
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