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Mild hyperthermia down-regulates receptor-dependent neutrophil function.

Dieter Fröhlich¹, Sigrid Wittmann, Gregor Rothe

¹Departments of *Anesthesia, †Clinical Chemistry and Laboratory Medicine, and ‡Surgery, University of Regensburg, Regensburg, Germany; and §Outcomes Research™ Institute and Departments of Anesthesiology and Pharmacology, University of Louisville, Louisville, Kentucky.

Anesthesia and Analgesia

|July 30, 2004

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Mild hypothermia complicates neutrophil function, impacting bacterial uptake and receptor activity. This study reveals complex temperature-dependent regulation of key neutrophil functions, challenging previous assumptions.

Area of Science:

Immunology
Cellular Biology
Physiology

Background:

Mild hypothermia is known to impair host defense mechanisms.
Previous research suggests hypothermia affects neutrophil phagocytosis and bacterial killing.

Purpose of the Study:

To investigate the temperature-dependent regulation of various neutrophil functions.
To elucidate the complex relationship between temperature and neutrophil activity in vitro.

Main Methods:

Neutrophils from volunteers were analyzed at temperatures ranging from 33°C to 41°C.
Flow cytometry and light microscopy were used to assess adhesion, receptor expression, phagocytosis, and oxidant release.

Main Results:

Hypothermia increased CD11b up-regulation by TNF-alpha and N-formyl-L-methionyl-L-leucyl-phenylalanine receptor expression.

Related Experiment Videos

Bacterial uptake was inversely related to temperature, particularly for Escherichia coli.

Receptor-dependent neutrophil functions showed complex temperature-dependent regulation, with hypothermia often enhancing activity.

Conclusions:

Neutrophil function exhibits intricate temperature-dependent regulation, contrary to simpler models.
Hypothermia can enhance specific receptor-mediated neutrophil activities, suggesting a nuanced role in host defense.