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Brain glucose metabolism in hypobaric hypoxia

S I Harik1, W D Lust, S C Jones

  • 1Department of Neurology, Case Western Reserve University School of Medicine, Cleveland, Ohio USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1995
PubMed
Summary

Hypobaric hypoxia increases brain glucose metabolism and transport in rats. This adaptation enhances brain glucose uptake and utilization, supporting brain function under low oxygen conditions.

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Area of Science:

  • Neuroscience
  • Metabolic Physiology
  • Environmental Physiology

Background:

  • Hypobaric hypoxia is known to increase brain capillary density and glucose transport.
  • The metabolic consequences of these changes in the adult rat brain remain to be fully elucidated.

Purpose of the Study:

  • To investigate the metabolic changes in the adult rat brain following exposure to hypobaric hypoxia.
  • To understand the relationship between altered glucose transport and brain energy metabolism under hypoxic conditions.

Main Methods:

  • Adult rats were subjected to hypobaric hypoxia (0.5 atm) for 3 weeks.
  • Brain glucose, lactate, glycogen, ATP, phosphocreatine, and intracellular pH were measured.
  • Regional brain metabolic rate for glucose was assessed using 2-deoxyglucose studies.

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Main Results:

  • Hypoxia led to increased brain glucose and lactate concentrations and decreased brain glycogen.
  • No significant changes in regional brain ATP, phosphocreatine, or intracellular pH were observed, indicating successful adaptation.
  • 2-Deoxyglucose studies revealed a 10-40% increase in regional brain glucose metabolic rate.

Conclusions:

  • Hypobaric hypoxia induces increased glycolysis in the adult rat brain.
  • Enhanced glycolysis likely underlies the observed increase in glucose transporters and blood-to-brain glucose influx.
  • The brain successfully adapts metabolically to hypobaric hypoxia, maintaining energy homeostasis.