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Priming study of human phagocytes oxidative burst by using flow cytometry
C Elbim1, M A Gougerot-Pocidalo
1INSERM U294 et Laboratoire d'Immunologie et d'Hématologie, CHU X. Bichat, Paris, France.
Hematology and Cell Therapy
|December 1, 1996
Summary
Pro-inflammatory cytokines like TNF-alpha and IL-8 prime phagocyte oxidative bursts for bacterial killing. Impaired H2O2 production in HIV patients suggests a link to infection susceptibility.
Area of Science:
- Immunology
- Cellular Biology
- Microbiology
Background:
- Phagocytes release reactive oxygen species (ROS) crucial for bacterial killing and inflammation.
- The priming of phagocyte oxidative burst is vital for effective immune responses.
Purpose of the Study:
- To investigate the in vitro effects of proinflammatory cytokines on the phagocyte oxidative burst in whole blood.
- To assess the role of cytokines in priming the polymorphonuclear neutrophil (PMN) oxidative burst and its implications in disease.
Main Methods:
- Utilized flow cytometry to measure the phagocyte oxidative burst in whole blood.
- Examined the in vitro effects of various proinflammatory cytokines (TNF-alpha, IL-1 alpha, IL-1 beta, IL-6, IL-8, GM-CSF) on PMN oxidative burst.
Main Results:
- No tested cytokine directly activated the PMN oxidative burst.
- TNF-alpha, GM-CSF, and IL-8 strongly primed a PMN subpopulation, enhancing H2O2 production in response to fMLP.
- Reduced H2O2 production was observed in TNF-alpha or IL-8 primed PMN from HIV-infected patients, correlating with disease stage.
Conclusions:
- Certain cytokines (TNF-alpha, GM-CSF, IL-8) play a critical role in priming PMN for enhanced bactericidal activity in vivo.
- Impaired phagocyte oxidative burst priming in HIV infection may contribute to increased susceptibility to bacterial infections.
- A case study suggests impaired phagocyte priming may underlie severe recurrent infections in a child.