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Phagocytosis and clearance of apoptotic cells is mediated by MER

Abstract

Apoptosis is fundamental to the development and maintenance of animal tissues and the immune system1. Rapid clearance of apoptotic cells by macrophages is important to inhibit inflammation and autoimmune responses against intracellular antigens2,3,4. Here we report a new function for Mer, a member of the Axl/Mer/Tyro3 receptor tyrosine kinase family. merkd mice with a cytoplasmic truncation of Mer had macrophages deficient in the clearance of apoptotic thymocytes. This was corrected in chimaeric mice reconstituted with bone marrow from wild-type animals. Primary macrophages isolated from merkd mice showed that the phagocytic deficiency was restricted to apoptotic cells and was independent of Fc receptor-mediated phagocytosis or ingestion of other particles. The inability to clear apoptotic cells adequately may be linked to an increased number of nuclear autoantibodies in merkd mice. Thus, the Mer receptor tyrosine kinase seems to be critical for the engulfment and efficient clearance of apoptotic cells. This has implications for inflammation and autoimmune diseases such as systemic lupus erythematosus.

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Figure 1: Effect of bone marrow reconstitution on dexamethasone treatment of thymus.
Figure 2: Macrophage phagocytosis of apoptotic thymocytes from merkd and wild-type mice.
Figure 3: Binding of apoptotic thymocytes to wild-type and merkd macrophages.
Figure 4: Phagocytosis of opsonized thymocytes.

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Acknowledgements

We thank R. Bagnell and V. Madden for assistance with microscopy, C. Lawler for statistical analysis, E. Cash and T. Lee for histological assistance, S. Parker for irradiating mice and L. Su for critical reading of the manuscript.

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Correspondence to Glenn K. Matsushima.

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Scott, R., McMahon, E., Pop, S. et al. Phagocytosis and clearance of apoptotic cells is mediated by MER. Nature 411, 207–211 (2001). https://doi.org/10.1038/35075603

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