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Sequential cerebral biochemical and physiological events in controlled hypoxemia.

K Kogure, P Scheinberg, Y Utsunomiya

    Annals of Neurology
    |October 1, 1977
    PubMed
    Summary

    Mild hypoxemia initially activates brain glycolysis but severe oxygen deprivation impairs cellular respiration. This leads to increased cyclic adenosine monophosphate (cAMP), ion shifts, and suppressed neural activity, impacting brain energy.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Biochemistry

    Background:

    • Cerebral functional activity is sensitive to oxygen levels.
    • Understanding the biochemical markers of hypoxic brain injury is crucial.

    Purpose of the Study:

    • To investigate the effects of controlled hypoxemia on cerebral function in rats.
    • To examine the roles of cyclic adenosine monophosphate (cAMP) and aminergic neurotransmitters during hypoxia.

    Main Methods:

    • Controlled hypoxemia was induced in rats.
    • Cerebral tissue was analyzed for cyclic adenosine monophosphate (cAMP), aminergic neurotransmitters, glycolytic products, glycogen, potassium ions, brain water, and high-energy phosphates.

    Main Results:

    • Mild hypoxemia (PaO2 60-40 torr) activated cerebral glycolysis without anaerobic metabolism.

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  • Severe hypoxemia (further reduction in PaO2) impaired cellular respiration, indicated by glycolytic product accumulation.
  • Increased cAMP, potassium ion leakage, brain water, and suppressed neural activity preceded ATP depletion.
  • Hypoxia-induced neuroglycopenia correlated with diminished cerebral high-energy phosphates at PaO2 15 torr.
  • Hypoxemia did not alter aminergic neurotransmitter levels.

    • Conclusions:

    • Hypoxemia progressively impairs cerebral energy metabolism and neural function.
    • cAMP accumulation is an early marker of hypoxic cellular stress.
    • Aminergic neurotransmitters are not directly affected by hypoxemia in this model.