IGF-2 Preprograms Maturing Macrophages to Acquire Oxidative Phosphorylation-Dependent Anti-inflammatory Properties.

Affiliation

Shanghai Jiao Tong University School of Medicine and Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China. Electronic address: [Email]

Abstract

Recent investigations revealed that macrophages could be trained with an altered responsiveness, raising the possibility of combating autoimmune diseases by imparting anti-inflammatory capabilities to these cells. While investigating the effect of mesenchymal stem cells on experimental autoimmune encephalomyelitis (EAE), we found a critical role of insulin-like growth factor 2 (IGF-2) in training macrophages to become anti-inflammatory during their maturation. IGF-2 exerts its effects by preprogramming maturing macrophages to commit oxidative phosphorylation (OXPHOS). IGF-2-preprogrammed macrophages maintained the mitochondrial complex V activities even upon pro-inflammation stimulation, thus enabling an elevated programmed death-ligand 1 (PD-L1) expression. PD-L1 neutralization abolished the beneficial effect of IGF-2 on EAE. Furthermore, adoptive transfer of IGF-2-preprogrammed macrophages to EAE mice increased Tregs and alleviated the diseases. Our results demonstrate that shaping macrophage responsiveness by IGF-2 is effective in managing inflammatory diseases, and the OXPHOS commitment can be preset to determine the anti-inflammatory fate of macrophages.

Keywords

IGF-2,PD-L1,experimental autoimmune encephalomyelitis,immunometabolism,innate immune memory,macrophage,mesenchymal stem cell,oxidative phosphorylation,

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