Overexpression of KNG1 significantly reverses the inhibitory effects of sufentanil on inflammation and oxidative stress. Levels of (A) TNF-α, (B) IL-6, (C) IL-1β and (D) MCP-1 were determined via ELISA. (E) MDA content and the activities of (F) SOD, (G) CAT and (H) GSH-Px were assessed using commercial kits. ***P<0.001 vs. Oe-NC; ###P<0.001 vs. control; ΔP<0.05, ΔΔΔP<0.001 vs. LPS + Oe-NC; $P<0.05, $$P<0.01, $$$P<0.001 vs. 40 µM sufentanil + Oe-NC; &P<0.05, &&P<0.01, &&&P<0.001 vs. LPS; @P<0.05, @@P<0.01, @@@P<0.001 vs. LPS + 40 µM sufentanil + Oe-NC. KNG1, kininogen-1; TNF-α, tumor necrosis factor-α; IL, interleukin; MCP-1, monocyte chemoattractant protein-1; MDA, malondialdehyde; SOD, superoxide dismutase; CAT, catalase; GSH-Px, glutathione peroxidase; Oe, overexpression; NC, negative control.