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Blood, 15 June 2006, Vol. 107, No. 12, pp. 4930-4937.
Prepublished online as a Blood First Edition Paper on February 23, 2006; DOI 10.1182/blood-2005-10-4144.
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PHAGOCYTES
IL-10–producing macrophages preferentially clear early apoptotic cells
Wei Xu,
Anja Roos,
Nicole Schlagwein,
Andrea M. Woltman,
Mohamed R. Daha, and
Cees van Kooten
From the Department of Nephrology, Leiden University Medical Center, The Netherlands.
Efficient clearance of apoptotic cells seems to be a prerequisite to prevent the development of autoimmunity. Here we identify that macrophage colony-stimulating factor (M-CSF)–driven macrophages (Mø2s) are potent phagocytes that have the unique capacity to preferentially bind and ingest early apoptotic cells. This macrophage subset has intrinsic anti-inflammatory properties, characterized by high interleukin-10 (IL-10) production in the absence of proinflammatory cytokines, such as IL-6 and tumor necrosis factor- (TNF-). Importantly, whereas the IL-6 and TNF- production by granulocyte-macrophage (GM)–CSF–driven macrophages (Mø1s) is inhibited upon uptake of apoptotic cells, the anti-inflammatory status of Mø2 is retained during phagocytosis. Mø2s were shown to use CD14 to tether apoptotic cells, whereas recognition of phosphatidylserine (PS) contributed to uptake of early apoptotic cells. Mø2s showed more potent macropinocytosis compared with dendritic cells (DCs) and Mø1s, and uptake of apoptotic cells was inhibited by a macropinocytosis inhibitor. Our studies suggest that, under steady-state conditions, IL-10–producing Mø2s are prominently involved in the clearance of early apoptotic cells.
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