δ-Amyrone inhibits lipopolysaccharide-induced inflammatory cytokines and protects against endotoxic shock in mice

delta-Amyrone (13(18)-Oleanen-3-one), which is an active constituent extracted and separated from Sedum lineare Thunb., has been found to possess a potent anti-inflammatory effect in different inflammation model animals. But its effects on lipopolysaccharide (LPS)-induced endotoxic shock have not been previous explored. The aim of this study is to evaluate the effect of delta-Amyrone on LPS-induced inflammatory cytokines and the protective effect on endotoxic shock mice. Experimental animals received delta-amyrone (4 and 8 mg/kg, i.p.) and dexamethasone (DEX) (5 mg/kg, i.p.) at 24 and 1 h before LPS injection. delta-Amyrone treatment significantly decreased mortality rate, tissues myeloperoxodase (MPO) activity, p65 NF-kappa B protein expression when compared with the LPS groups. The levels of tumor nectosis factor-alphagene (TNF-alpha) and interleukin-6 (IL-6) both in serum and lung, liver, kidney tissues, as well as the accumulation of nitric oxide (NO) in serum were decreased by delta-amyrone in response to p65 nuclear factors-kappa B (NF-kappa B). These results suggest that the protective activity of delta-amyrone on LPS-induced endotoxic shock is attributed to reducing NO production and mediating the pro-inflammatory cytokines, inhibited NF-kappa B expression. (C) 2015 Elsevier Ireland Ltd. All rights reserved.