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Related Experiment Videos

The deoxyglucose method in the ferret brain. I. Methodological considerations.

C Redies1, M Diksic

  • 1Cone Laboratory, Montreal Neurological Institute, Québec, Canada.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|February 1, 1989
PubMed
Summary

The rate of metabolized tracer loss from ferret brain is about 1%/min. This loss rate has a negligible influence on cerebral glucose utilization measurements in standard 45-minute experiments using 2-deoxyglucose (2-DG).

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Radiochemistry

Background:

  • Cerebral glucose utilization is critical for brain function.
  • The 2-deoxyglucose (2-DG) method is widely used to measure glucose metabolism.
  • Accurate determination of rate constants is essential for the 2-DG method.

Purpose of the Study:

  • To calculate 2-deoxyglucose (2-DG) transfer rate constants in the anesthetized ferret brain.
  • To assess the influence of metabolized tracer loss on cerebral glucose utilization measurements.

Main Methods:

  • Regional gray matter time-radioactivity curves were measured for 180 minutes post-tracer injection.
  • Rate constants for tracer loss (k4*) were calculated assuming first-order kinetics.
  • Simulation experiments were performed to evaluate the impact of k4* on glucose utilization rates.

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Main Results:

  • Metabolized tracer loss from brain occurs at approximately 1%/min for the first 180 minutes.
  • Assuming k4* as 0 or 0.01 min-1 had a negligible effect on glucose utilization rates in 45-minute experiments.
  • The 2-DG lumped constant varied from 0.54 (k4*=0) to 0.68 (k4*=0.01 min-1).

Conclusions:

  • The rate of metabolized 2-deoxyglucose (2-DG) loss from brain does not significantly affect short-term cerebral glucose utilization measurements.
  • Standard 45-minute autoradiographic experiments provide reliable glucose utilization data.
  • Consistent analysis, including lumped constant determination, is key for accurate results.