MRP8/14 mediates macrophage efferocytosis through RAGE and Gas6/MFG‐E8, and induces polarization via TLR4‐dependent pathway

Myeloid‐related protein 8/14 (MRP8/14) participates in various inflammatory responses, however, its effect on macrophage efferocytosis remains unclear. Here, we demonstrate that MRP8/14 significantly inhibits the efferocytosis of apoptotic thymocytes by mouse bone marrow‐derived macrophages (BMDMs), which later proves to be associated with the receptor for advanced glycation end products (RAGE) or for reducing the expression of growth arrest‐specific protein 6 and milk fat globule epidermal growth factor 8, independent of RAGE. Furthermore, MRP8/14 promotes polarization of BMDMs from the M2‐ to M1‐like phenotype by upregulating expression of M1‐related surface receptor proteins and signature M1‐marker genes and by downregulating signature M2‐marker gene expression, which depends on Toll‐like receptor 4 and p38 mitogen‐activated protein kinase/nuclear factor κB pathways. Thus, we report a significant inhibitory effect of MRP8/14 on macrophage efferocytosis and MRP8/14‐mediated phenotypic polarization, which may be helpful in developing novel therapeutic strategies leading to inflammation resolution.

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