Abstract
Bidens bipinnata L. is well known as a traditional antipyretic, anti-inflammatory and anti-rheumatic medicine in China. This study was designed to evaluate the role of total extracted flavonoids from B. bipinnata (TFB) in inhibiting the production of inflammatory cytokines. Human umbilical vein endothelial cells (HUVEC) were used to examine the effect of TFB on the production of inflammatory cytokines. The supernatant interleukin (IL)-8, tumour necrosis factor (TNF)-α and nitric oxide (NO) levels of HUVEC were measured with ELISA methods. Nuclear factor-kappaB (NF-κB) and fractalkine expression was evaluated by RT-PCR and Western blot methods, respectively. We observed that IL-8, TNF-α and NO release of HUVEC incubated with sera from active Henoch-Schönlein purpura (HSP) was significantly increased. TFB intervention may significantly suppressed the supernatant IL-8, TNF-α and NO levels of HUVEC. Similarly, TFB obviously suppressed the NF-κB and fractalkine mRNA and protein expression. These results suggested that TFB may be useful for improving microvascular inflammation in HSP patients.
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