Neutrophil oxidative burst and degranulation

Neutrophil oxidative burst and degranulation are the primary effector mechanisms of the innate immune system used to destroy invading microorganisms. The oxidative burst involves the rapid production of reactive oxygen species (ROS), such as superoxide anions and hydrogen peroxide, primarily through the activation of the NADPH oxidase (NOX2) complex (StatPearls, 2023). Degranulation refers to the regulated release of antimicrobial proteins and enzymes—including myeloperoxidase, lactoferrin, and neutrophil elastase—from intracellular granules into the phagosome or the extracellular environment (Journal of Leukocyte Biology, 2020). While these processes are essential for host defense, their chronic or excessive activation is implicated in the tissue damage seen in inflammatory diseases like COPD, rheumatoid arthritis, and vasculitis (Nature Reviews Immunology, 2013). Pharmacological intervention typically targets specific molecular components of these pathways, such as MPO or NOX enzymes, to reduce pathological inflammation while attempting to preserve basic immune function.

Other names

Respiratory burstNeutrophil activationNeutrophil effector responsePolymorphonuclear leukocyte activationNeutrophil degranulation

Modulation of reactive oxygen species production via NADPH oxidase inhibition and the blockade of antimicrobial enzyme release from intracellular granules.