Neutrophil Activation and Reactive Oxygen Species Dynamics

Neutrophils are frontline defenders of the innate immune system, swiftly responding to invading pathogens through a coordinated programme of activation. Central to their antimicrobial arsenal is the regulated production of reactive oxygen species (ROS), which serve both to destroy microbes and to modulate signalling pathways that shape the ensuing inflammatory response. Activation of neutrophils typically involves a priming step—induced by cytokines, microbial products or extracellular matrix components—followed by a full oxidative burst upon encounter with a secondary stimulus. This sequence is orchestrated by receptor engagement (including G-protein-coupled receptors, toll-like receptors and Fcγ receptors), intracellular kinase cascades such as those mediated by p38 mitogen-activated protein kinase, and assembly of the NADPH oxidase complex at phagosomal or endosomal membranes. The spatial and temporal dynamics of ROS release ensure effective pathogen clearance while limiting bystander tissue damage. Beyond microbial defence, neutrophil-derived ROS influence processes as diverse as neutrophil extracellular trap formation, apoptosis and the regulation of vascular permeability, thus linking innate immunity to wider host-defence and repair mechanisms. Dysregulation of these processes contributes to chronic inflammation, autoimmunity and impaired wound healing, emphasising the therapeutic potential of targeting neutrophil activation and ROS dynamics in human disease.

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Neutrophil Activation and Reactive Oxygen Species Dynamics publication trend

The graph below shows the total number of articles in neutrophil activation and reactive oxygen species dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Neutrophil: A type of white blood cell that serves as a first responder in innate immunity, capable of engulfing pathogens and releasing antimicrobial molecules.

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen that mediate pathogen killing and cellular signalling during inflammation.

NADPH oxidase: A multi-protein enzyme complex in neutrophils responsible for the production of superoxide, the precursor of various ROS.

Priming: The process by which neutrophils become more responsive to subsequent activating stimuli, often enhancing ROS generation.

Oxidative burst: A rapid release of ROS by neutrophils following activation, crucial for microbial clearance.

NETosis: A specialised form of cell death in which neutrophils release web-like structures composed of DNA and antimicrobial proteins to trap pathogens.

References

1. Hyaluronan promotes intracellular ROS production and apoptosis in TNFα-stimulated neutrophils. Frontiers in Immunology (2023).
2. Paracetamol suppresses neutrophilic oxygen radicals through competitive inhibition and scavenging. Chemico-Biological Interactions (2024).
3. Neutrophils to the ROScue: Mechanisms of NADPH Oxidase Activation and Bacterial Resistance. Frontiers in Cellular and Infection Microbiology (2017).