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Hyperglycemia and lipopolysaccharide decrease depression effect of interleukin 8 production by hypothermia: an

Akihiro Noda1, Kosaku Kinoshita, Atsushi Sakurai

  • 1Department of Emergency and Critical Care Medicine, Nihon University School of Medicine, 30-1 Oyaguchi Kamimachi, Itabashi-ku, Tokyo 173-8610, Japan. anoda@med.nihon-u.ac.jp

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|September 28, 2007
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Summary
This summary is machine-generated.

Hypothermia reduces interleukin-8 (IL-8) production in endothelial cells, but hyperglycemia and LPS can counteract this effect. This combination may increase tissue damage risk during therapeutic hypothermia.

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Area of Science:

  • Endocrinology
  • Immunology
  • Cell Biology

Background:

  • Interleukin-8 (IL-8) is a key inflammatory cytokine.
  • Endothelial cells play a crucial role in vascular inflammation.
  • Therapeutic hypothermia is used to reduce tissue damage, but its effects on cytokine production require investigation.

Purpose of the Study:

  • To determine if hyperglycemia and lipopolysaccharide (LPS) counteract the hypothermia-induced reduction of IL-8 production in endothelial cells.
  • To assess the impact of combined hypothermia, hyperglycemia, and LPS on IL-8 mRNA expression and protein levels.

Main Methods:

  • Human umbilical vein endothelial cells (HUVECs) were cultured at 30°C or 37°C.
  • Cells were exposed to varying glucose concentrations (hyperglycemia) and LPS stimulation.
  • IL-8 mRNA expression and protein levels were measured at 5, 12, and 24 hours.

Main Results:

  • Hypothermia (30°C) significantly decreased basal IL-8 mRNA and protein levels.
  • Hyperglycemia increased IL-8 production at 37°C under both basal and LPS-stimulated conditions.
  • At 30°C, hyperglycemia still significantly increased LPS-stimulated IL-8 production, overriding some hypothermic effects.

Conclusions:

  • Hypothermia reduces IL-8 production in HUVECs, but not IL-8 mRNA expression.
  • The combination of hypothermia, hyperglycemia, and LPS stimulation may increase the risk of secondary tissue damage.
  • These findings highlight potential risks during therapeutic hypothermia in hyperglycemic patients stimulated by LPS.