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Glucose conversion by multiple pathways in brain extract: theoretical and experimental analysis.

Ferenc Orosz1, Gábor Wágner, Fernando Ortega

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|September 19, 2003
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Summary
This summary is machine-generated.

Brain cells metabolize glucose via glycolysis and the pentose phosphate pathway, sharing glucose-6-phosphate (Glu6P). Enzyme activity influences this balance, with models predicting flux but sometimes deviating from experimental results, suggesting compartmentalization.

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Area of Science:

  • Biochemistry
  • Metabolic pathways
  • Systems biology

Background:

  • Glucose metabolism is crucial for brain function.
  • Hexokinase controls glucose conversion to glucose-6-phosphate (Glu6P).
  • Glu6P is a key intermediate shared by glycolysis and the pentose phosphate pathway (PPP).

Purpose of the Study:

  • To characterize the flux of glucose metabolism and Glu6P sharing between glycolysis and PPP in brain extracts.
  • To evaluate a mathematical model for fitting experimental data on metabolic flux.
  • To investigate the impact of altered hexokinase activity on Glu6P partitioning.

Main Methods:

  • Experimental studies using brain extracts.
  • Development and application of a mathematical model based on enzyme kinetics.
  • Measurement of metabolic flux ratios under varying enzyme activities.

Main Results:

  • Glu6P was shared between glycolysis and PPP in a 1.5:1 ratio in brain extracts.
  • Exogenous glucose-6-phosphate dehydrogenase favored the PPP, but glycolysis still utilized 17% of Glu6P.
  • Moderate increases in hexokinase activity slightly shifted flux towards glycolysis.
  • Doubling hexokinase activity led to less flux into glycolysis than predicted by the model.

Conclusions:

  • The mathematical model accurately described most experimental observations.
  • Discrepancies at high hexokinase activity suggest non-ideal behavior, possibly due to distinct metabolic pools.
  • Hexokinase activity and enzyme concentrations significantly influence Glu6P partitioning between major metabolic pathways.