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Astragaloside III (AS-III) is a triterpenoid saponin contained in Astragali Radix and has potent anti-inflammatory effects on vascular endothelial cells; however, underlying mechanisms are unclear. In this study, we provided the first piece of evidence that AS-III induced phosphorylation of TNF-α converting enzyme (TACE) at Thr735 and enhanced its sheddase activity. As a result, AS-III reduced surface TNFR1 level and increased content of sTNFR1 in the culture media, leading to the inhibition of NF-κB signaling pathway and attenuation o