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Cytokines and fever

M J Kluger1, W Kozak, L R Leon

  • 1Institute for Basic and Applied Medical Research, Lovelace Institutes, Albuquerque, N.Mex., USA.

Neuroimmunomodulation
|July 1, 1995
PubMed
Summary

Fever results from immune mediators raising the body's temperature set-point, a process involving cytokines like IL-1 beta and IL-6. Recent findings suggest neural signals, not just circulating pyrogens, may trigger these fever responses in the brain.

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Area of Science:

  • Neuroimmunology
  • Physiology
  • Thermoregulation

Background:

  • Fever is a key example of neuroimmunomodulation, where immune responses elevate the thermoregulatory set-point.
  • Cytokines such as interleukin (IL)-1 beta and IL-6 act as endogenous pyrogens, mediating fever.
  • Tumor necrosis factor-alpha exhibits complex roles, potentially acting as both a pyrogen and an antipyretic.

Purpose of the Study:

  • To explore the mechanisms underlying fever induction.
  • To investigate the roles of cytokines and neural signaling in fever.
  • To understand the adaptive significance of fever in host defense.

Main Methods:

  • Review of existing literature on fever, cytokines, and neuroimmunomodulation.
  • Analysis of studies investigating cytokine pathways in the hypothalamus.
  • Examination of evidence for neural versus humoral signaling in fever initiation.

Main Results:

  • Cytokines like IL-1 beta and IL-6 are confirmed endogenous pyrogens that initiate fever.
  • Tumor necrosis factor-alpha demonstrates dual roles as pyrogen and cryogen depending on inflammatory context.
  • Emerging evidence points to neural pathways from peripheral nerves as potential initiators of brain cytokine signaling for fever.

Conclusions:

  • Fever is a complex adaptive response orchestrated by neuroimmune interactions.
  • While cytokines are central mediators, neural signaling pathways may play a critical role in initiating fever.
  • Further research is needed to fully elucidate the interplay between neural and humoral factors in fever pathogenesis.

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