Abstract

Neutrophils are the most abundant leukocytes and serve as a first line of defense against infectious microorganisms. For this purpose, neutrophils contain granules filled with proteolytic and other cytotoxic enzymes. Neutrophils have the shortest lifespan of all leukocytes. To prevent senescent neutrophils from releasing their toxic contents into the surrounding tissues, these cells become apoptotic and are then internalized by tissue macrophages. Recent studies have revealed more details about effects of cytokines on neutrophil apoptosis and on the uptake of apoptotic neutrophils by macrophages. In addition, the intracellular events leading to apoptosis are slowly being unraveled.

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