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Neutrophil priming: pathophysiological consequences and underlying mechanisms

A M Condliffe, E Kitchen, E R Chilvers

    Clinical Science (London, England : 1979)
    |July 31, 1998
    PubMed
    Summary

    Neutrophil priming enhances immune cell responses and longevity at inflammation sites. Neutrophils can also

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Neutrophil priming, induced by agents like TNF-α, GM-CSF, and LPS, significantly amplifies neutrophil responses to activators.
    • Priming is crucial for neutrophil-mediated tissue injury and involves enhanced superoxide generation, degranulation, and lipid mediator release.

    Discussion:

    • Mechanisms of priming involve protein tyrosine phosphorylation and activation of phospholipase D and phosphoinositide 3-kinase.
    • While initial studies suggested dissociation from receptor changes and G-protein signaling, newer research points to specific enzymatic pathways.

    Key Insights:

    • Priming delays apoptosis, extending neutrophil functional lifespan at inflamed sites.
    • Neutrophils exhibit a remarkable ability to 'de-prime' and 're-prime', indicating dynamic regulation of their activation state.

    Outlook:

    • Understanding neutrophil priming and de-priming cycles offers insights into inflammatory diseases.
    • Further research into these dynamic neutrophil behaviors could reveal novel therapeutic targets.

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