Neutrophil activation machinery

Neutrophil activation machinery refers to the integrated system of receptors, signaling cascades, and effector proteins that mediate the recruitment and antimicrobial activities of neutrophils [1]. This machinery includes G protein-coupled receptors (GPCRs) for chemoattractants like C5a and fMLP, adhesion molecules such as integrins, and the NADPH oxidase complex responsible for the respiratory burst [2]. Upon activation, neutrophils undergo a series of functional changes including chemotaxis, phagocytosis, degranulation, and the release of neutrophil extracellular traps (NETs) to neutralize pathogens [5]. While essential for host defense, dysregulated or chronic activation of this machinery is a primary driver of tissue damage in inflammatory and autoimmune diseases such as rheumatoid arthritis, COPD, and acute respiratory distress syndrome (ARDS) [1, 2]. Therapeutic strategies often target specific components of this machinery, such as the DPP1 inhibitor brensocatib or the C5aR antagonist avacopan, to dampen excessive inflammation without completely compromising the immune response [3, 4].

Other names

Neutrophil activation pathwayNeutrophil effector systemNeutrophil signaling networkNeutrophil activation complex

Inhibition of neutrophil protease maturation via DPP1 inhibition, antagonism of chemoattractant receptors such as C5aR1, and suppression of effector functions like the oxidative burst or NETosis.