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Related Experiment Videos

Measuring brain glucose phosphorylation with labeled glucose.

H E Brøndsted1, A Gjedde

  • 1Department of General Physiology and Biophysics, Panum Institute, University of Copenhagen, Denmark.

The American Journal of Physiology
|April 1, 1988
PubMed
Summary

Researchers confirmed that C-6 labeled glucose can measure brain glucose phosphorylation (CMRGlc) in rats, even when metabolites rapidly leave the brain. Corrections for metabolite loss enable accurate CMRGlc determination.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Physiology

Background:

  • Accurate measurement of brain glucose phosphorylation (CMRGlc) is crucial for understanding brain metabolism.
  • Previous studies questioned the utility of C-6 labeled glucose due to rapid metabolite clearance from the brain.

Purpose of the Study:

  • To investigate if glucose labeled at the C-6 position can be reliably used to measure brain glucose phosphorylation (CMRGlc).
  • To determine if rapid metabolite loss from the brain invalidates C-6 labeled glucose as a tracer for CMRGlc.

Main Methods:

  • Utilized pentobarbital-anesthetized rats for the study.
  • Measured parietal cortex uptake of [14C]glucose labeled at the C-6 position over time (10 s to 60 min).
  • Employed a method to correct for the loss of labeled metabolites by extrapolating initial glucose uptake data.

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Main Results:

  • Observed radioactivity in the parietal cortex followed a monoexponentially declining function, indicating metabolite loss from the start.
  • A constant of decline (0.0077.min-1) was determined for the parietal cortex.
  • Despite metabolite loss, corrected CMRGlc values averaged 64 +/- 4 mumol.hg-1.min-1 between 4 and 60 min.

Conclusions:

  • C-6 labeled glucose can be used to accurately measure brain glucose phosphorylation (CMRGlc).
  • A correction method effectively accounts for the rapid loss of labeled metabolites from the brain.
  • This validates the use of C-6 labeled glucose in quantitative brain metabolism studies.