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Myc-nick promotes efferocytosis through M2 macrophage polarization during resolution of inflammation.
FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology 2018 October
A key event required for effective resolution of inflammation is efferocytosis, which is defined as phagocytic removal of apoptotic cells mostly by macrophages acquiring an alternatively activated phenotype (M2). c-Myc has been reported to play a role in alternative activation of human macrophages and is proposed as one of the M2 macrophage markers. We found that M2-like peritoneal macrophages from zymosan A-treated mice exhibited a marked accumulation of Myc-nick, a truncated protein generated by a Calpain-mediated proteolytic cleavage of full-length c-Myc. Further, ectopic expression of Myc-nick in murine bone marrow-derived macrophages promoted the M2 polarization and, consequently, enhanced their efferocytic capability. Notably, Myc-nick-induced efferocytosis was found to be tightly associated with α-tubulin acetylation by K acetyltransferase 2a (Kat2a/Gcn5) activity. These findings suggest Myc-nick as a novel proresolving mediator that has a fundamental function in maintaining homeostasis under inflammatory conditions.-Zhong, X., Lee, H.-N., Kim, S. H., Park, S.-A., Kim, W., Cha, Y.-N., Surh, Y.-J. Myc-nick promotes efferocytosis through M2 macrophage polarization during resolution of inflammation.
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