NOS2 and colitis: It is also reported that naringenin significantly improved colitis in a DSS-induced mice colitis model by inhibiting of TLR4 protein and NF-κB activity, downregulating the expression of inflammatory mediators (iNOS, ICAM-1, MCP-1 Cox-2, TNF-α and IL-6) and the production of inflammatory cytokines (TNF-α and IL-6) [60].