Maresin2 negatively regulates DC's maturation via the MAPK/NF-κB pathway in DCs

Objective: To observe the effects and mechanisms of Maresin2 on the function of DCs(Dendritic cells). Method: The levels of IL-6, IL-12, TNF-alpha and IL-1 beta secreted by BMDCs (Bone marrow-derived Dendritic cells) after Maresin2 treatment were detected by ELISA. At the same time, the expressions of costimulatory molecules CD40 and CD86 on the surface, the ability of phagocytosis of ovalbumin(OVA) antigen, and antigen presentation function in BMDCs were analyzed by flow cytometry. Finally, MAPK and NF-kappa B pathway signaling phosphorylation in Maresin2-treated BMDCs were detected by western blot. Results: The secretion levels of IL-6, IL-12, TNF-alpha and IL-1 beta were significantly decreased in the Maresin2 treatment group after LPS treatment (P < 0.05). The expression levels of CD86 and CD40 were significantly decreased after Maresin2 treatment (P < 0.05). Maresin2 enhanced the phagocytosis ability of ovalbumin(OVA) (P < 0.05), but the ability of antigen presentation of BMDCs with the treatment of Maresin2 changed slightly (P > 0.05). Phosphorylation of p38, JNK, p65, ikka/beta and ERK peaked at 15 min in the LPS group, while phosphorylation of p-p38 and p-ERK weakened 30 min and 60 min after treatment with Maresin2. Conclusions: Maresin2 inhibits inflammatory cytokine secretion but enhances phagocytosis via the MAPK/NF-kappa B pathway in BMDCs, which may contribute to negatively regulating inflammation.