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Oxidative stress and pyrogenic fever pathogenesis

Ching-Cheng Hou1, Hung Lin, Ching-Ping Chang

  • 1Department of Intensive Care Medicine, Chi Mei Medical Center, Tainan 710, Taiwan.

European Journal of Pharmacology
|June 15, 2011
PubMed

Insights

This study reveals how bacterial components trigger fever by altering tissue redox balance, involving reactive oxygen and nitrogen species, and glutamate. Understanding these mechanisms could lead to new fever-reducing therapies.

Area of Science:

  • Biochemistry
  • Immunology
  • Neuroscience

Background:

  • Fever is a complex physiological response involving inflammatory and neurological pathways.
  • The role of tissue redox state and specific signaling molecules in fever induction is not fully understood.

Purpose of the Study:

  • To investigate the causative and regulatory links between tissue redox state changes and fever induction.
  • To elucidate the involvement of reactive oxygen/nitrogen species and glutamate in lipopolysaccharide (LPS)-induced fever.

Main Methods:

  • Investigated the effects of LPS on leukocytes, leading to the release of reactive oxygen/nitrogen species (ROS/RNS).
  • Examined the role of inflammation-associated hypoxia in stimulating glutamate release and excitotoxicity.
  • Analyzed the contribution of glutamate, NO(x)(-), OH, and prostaglandin E(2) in the hypothalamus during pyrogenic fever.

Main Results:

  • LPS induces pro-inflammatory cytokines and activates leukocytes to release ROS/RNS (hydroxyl radical (OH), nitric oxide metabolites (NO(x)(-)), superoxide (O(2))).
  • Hypoxia during inflammation stimulates glutamate release, causing excitotoxicity and further ROS/RNS production.
  • Glutamate, NO(x)(-), OH, and antioxidants are implicated in the pathogenesis and regulation of LPS/cytokine-induced fever.

Conclusions:

  • Reactive nitrogen species contribute to cellular injury through lipid peroxidation and oxidative damage.
  • Glutamate, NO(x)(-), OH, and prostaglandin E(2) signaling in the hypothalamus are key in pyrogenic fever.
  • Further research into these hypothalamic signaling pathways may offer novel strategies for fever suppression.

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