Direct influence of mild hypothermia on cytokine expression and release in cultures of human peripheral blood mononuclear cells.

Hypothermia is associated with elevated frequency of infectious complications. Dysfunction of the immune response caused by hypothermia has been demonstrated in both clinical and animal studies, but it still remains unclear to what extent immunocompetent cells are directly influenced by hypothermia. To estimate the direct influence of mild hypothermia on cytokine expression and release by human peripheral blood mononuclear cells (PBMC), primary cultures of PBMC were incubated at 34 degrees C or 32 degrees C activated by lipopolysaccharide (LPS), phytohemagglutinin (PHA), or tumor necrosis factor-alpha (TNF-alpha). The cytokine gene expression was evaluated by RT-PCR. Release of interleukin-2 (IL-2), IL-6, IL-10, and TNF-alpha was measured by ELISA. Mild hyperthermia significantly impaired IL-2 gene expression in PHA-stimulated cultures of PBMC and decreased IL-2 release in all variants of cultures. Secretion of IL-6, IL-10, and TNF-alpha was decreased in hypothermic cultures of PBMC stimulated with the T lymphocyte activator PHA. Slight suppression of IL-10 secretion was observed also in TNF-alpha-stimulated hypothermic cultures of PBMC. TNF-alpha release increased slightly in mild hypothermia control cultures. Our data demonstrate that the direct influence of hypothermia on cytokine expression and release from PBMC is not uniform. Reduction of IL-2 production might play a crucial role in the impairment of immune response in hypothermia.

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