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Clearance of apoptotic and necrotic cells and its immunological consequences

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Abstract

The ultimate and most favorable fate of almost all dying cells is engulfment by neighboring or specialized cells. Efficient clearance of cells undergoing apoptotic death is crucial for normal tissue homeostasis and for the modulation of immune responses. Engulfment of apoptotic cells is finely regulated by a highly redundant system of receptors and bridging molecules on phagocytic cells that detect molecules specific for dying cells. Recognition of necrotic cells by phagocytes is less well understood than recognition of apoptotic cells, but an increasing number of recent studies, which are discussed here, are highlighting its importance. New observations indicate that the interaction of macrophages with dying cells initiates internalization of the apoptotic or necrotic targets, and that internalization can be preceded by “zipper”-like and macropinocytotic mechanisms, respectively. We emphasize that clearance of dying cells is an important fundamental process serving multiple functions in the regulation of normal tissue turnover and homeostasis, and is not just simple anti- or pro-inflammatory responses. Here we review recent findings on genetic pathways participating in apoptotic cell clearance, mechanisms of internalization, and molecules involved in engulfment of apoptotic versus necrotic cells, as well as their immunological consequences and relationships to disease pathogenesis.

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Authors and Affiliations

  1. Molecular Signaling and Cell Death Unit, Department for Molecular Biomedical Research, VIB-Ghent University, Technologiepark 927, B-9052, Ghent, Belgium

    Dmitri V. Krysko & Peter Vandenabeele

  2. Department of Human Anatomy, Embryology, Histology and Medical Physics, Ghent University, Godshuizenlaan, 4, B-9000, Ghent, Belgium

    Dmitri V. Krysko & Katharina D’Herde

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  1. Dmitri V. Krysko
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  2. Katharina D’Herde
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  3. Peter Vandenabeele
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Correspondence to Dmitri V. Krysko.

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Katharina D’Herde and Peter Vandenabeele share senior authorship.

This study was supported by Ghent University GOA grant No. 12050502, IUAP-V/12-12.0C14.02, FWO-Vlaanderen 3G.0218.06, and Flanders Interuniversity Institute for Biotechnology (VIB).

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Krysko, D.V., D’Herde, K. & Vandenabeele, P. Clearance of apoptotic and necrotic cells and its immunological consequences. Apoptosis 11, 1709–1726 (2006). https://doi.org/10.1007/s10495-006-9527-8

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