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Related Experiment Videos

Hypoxia-induced anapyrexia: implications and putative mediators.

Alexandre A Steiner1, Luiz G S Branco

  • 1Department of Morphology, Estomatology and Physiology, Dental School of Ribeirão Preto, SP, Brazil. asteiner@rfi.fmrp.usp.br

Annual Review of Physiology
|February 5, 2002
PubMed
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Hypoxia triggers anapyrexia, a regulated body temperature decrease, to conserve oxygen and reduce metabolic stress. This response, crucial for survival, is mediated centrally and bypasses peripheral oxygen sensors.

Area of Science:

  • Physiology
  • Animal Biology
  • Biochemistry

Background:

  • Hypoxia, or low oxygen, triggers diverse survival mechanisms in animals.
  • Anapyrexia, a regulated drop in body temperature, is a key response to hypoxia.
  • Anapyrexia conserves oxygen, enhances hemoglobin's oxygen affinity, and mitigates costly hypoxia responses.

Purpose of the Study:

  • To review the physiological mechanisms underlying hypoxia-induced anapyrexia.
  • To explore the central nervous system's role in regulating body temperature during hypoxia.
  • To identify potential chemical mediators involved in anapyrexia.

Main Methods:

  • Review of existing physiological and biochemical literature on hypoxia.
  • Analysis of studies investigating central nervous system pathways.

Related Experiment Videos

  • Examination of evidence regarding peripheral chemoreceptor involvement.

    • Main Results:

    • Anapyrexia reduces oxygen demand and improves oxygen utilization.
    • Several substances like adenosine and nitric oxide are implicated as mediators.
    • Hypoxia-induced anapyrexia appears independent of peripheral chemoreceptor activation.

    Conclusions:

    • Anapyrexia is a vital, centrally regulated adaptation to hypoxia.
    • Understanding anapyrexia mechanisms offers insights into physiological resilience.
    • Further research is needed to fully elucidate the mediators and pathways involved.