Uderhardt et al., Cell 2019

Resident Macrophages Cloak Tissue Microlesions to Prevent Neutrophil-Driven Inflammatory Damage


HIGHLIGHTS Resident tissue macrophages (RTMs) respond to tissue damage and cloak the debris. Cloaking by RTM prevents neutrophil activation and neutrophil-driven inflammation. Cloaking by RTM prevents excess tissue damage and preserves tissue homeostasis.

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SUMMARY Neutrophils are attracted to and generate dense swarms at sites of cell damage in diverse tissues, often extending the local disruption of organ architecture produced by the initial insult. Whether the inflammatory damage resulting from such neutrophil accumulation is an inescapable consequence of parenchymal cell death has not been explored. Using a combination of dynamic intravital imaging and confocal multiplex microscopy, we report here that tissue-resident macrophages rapidly sense the death of individual cells and extend membrane processes that sequester the damage, a process that prevents initiation of the feedforward chemoattractant signaling cascade that results in neutrophil swarms. Through this “cloaking” mechanism, the resident macrophages prevent neutrophil-mediated inflammatory damage, maintaining tissue homeostasis in the face of local cell injury that occurs on a regular basis in many organs because of mechanical and other stresses.

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The techniques & methods we used in this study:
+ Intravital 2P-microscopy
+ Multiplex confocal microscopy
+ Optical clearing (Ce3D)
and volume imaging
+ Spatiotemporal tracking
+ low-input bulk RNA sequencing
+ In vivo cell biology

Resident tissue macrophages (green) cloaking a stromal microlesion (brown).