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Temperature influence on stimulated PMN respiratory burst
M Catenaccio1, D Chindamo, S Lorenzini
1Institute of Rheumatology, University of Siena.
Summary
Body temperature significantly impacts human neutrophil function. Elevated temperatures (40-42°C) reduce oxygen free radical release, except for monosodium urate crystals, which increase release at 39°C.
Area of Science:
- Immunology
- Cellular Physiology
Background:
- Body temperature influences disease pathogenesis, potentially by affecting white blood cell functions.
- Neutrophils play a critical role in the immune response through mechanisms like the respiratory burst.
Purpose of the Study:
- To investigate the effect of varying temperatures on the respiratory burst activity of human neutrophils.
- To understand how temperature modulates neutrophil responses to different stimuli.
Main Methods:
- Human polymorphonuclear leukocytes (neutrophils) were isolated from blood.
- Neutrophils were stimulated with opsonized zymosan (OZ), FMLP, PMA, and MSU crystals at temperatures ranging from 26°C to 42°C.
- Luminol-dependent chemiluminescence was used to measure oxygen free radical (OFR) release.
Main Results:
- OFR production in neutrophils stimulated with OZ, FMLP, and PMA was highest at 37°C and decreased significantly at higher temperatures (up to 42°C).
- Neutrophil stimulation with MSU crystals showed a significant increase in OFR release at 39°C compared to 37°C.
- Temperature's effect is complex, involving not only neutrophil activity but also crystal properties.
Conclusions:
- Body temperature modulates neutrophil respiratory burst activity, with optimal function generally observed at 37°C.
- The response of neutrophils to MSU crystals is temperature-dependent, with increased activity at 39°C.
- Further research is needed to elucidate the interplay between temperature, neutrophil function, and crystal characteristics.