Paeoniflorin treatment was reported to lead to significant improvement of DSS-induced colitis by significantly reversing the upregulation of TLR4, decreasing the activity of MPO, reducing the production of inflammatory cytokines (TNF-αand IL-6), downregulating inflammatory mediators (MCP-1, Cox-2, IFN-γ, TNF-α, IL-6, and IL-17), and limiting the inflammatory (histological) response [66]. Here, CCL2 is linked to colitis.