8-Prenylkaempferol, a natural product isolated and purified from the roots of Sophora flavescens, is an effective agent for attenuating pro-inflammatory NO induction, induces differentiation/maturation of MC3T3-E1 osteoblasts by BMP-2/p38/Runx2 pathways, and may be an anti-inflammatory agent for suppressing influenza A virus-induced RANTES production acts by blocking PI3K-mediated transcriptional activation of NF-κB and IRF-3 and in part by interfering with IκB degradation which subsequently decreases NF-κB translocation.