Abstract
Neutrophil extracellular traps (NETs) are toxic extracellular structures deployed by neutrophils in response to pathogens and sterile danger signals. NETs are circadian in nature as mouse and human neutrophils preferentially deploy them at night or early morning. Traditionally, NETs have been quantified using a plethora of methods including immunofluorescence and ELISA-based assays; however few options are available to visualize them in vivo. Here we describe a method to directly visualize and quantify NET formation and release in the microvasculature of the lung using intravital imaging in a model of acute lung injury. The method allows four-dimensional capture and quantification of NET formation dynamics over time and should be a useful resource for those interested in visualizing neutrophil responses in vivo.
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