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Fructose 2,6-bisphosphate changes in rat brain during ischemia
M Yamamoto1, N Hamasaki, Y Maruta
1Department of Clinical Chemistry and Laboratory Medicine, Fukuoka University School of Medicine, Japan.
Journal of Neurochemistry
|February 1, 1990
Summary
Brain ischemia increases fructose 2,6-bisphosphate levels, accelerating glycolysis. This key finding in spontaneously hypertensive rats suggests a compensatory mechanism during early ischemic stages.
Area of Science:
- Biochemistry
- Neuroscience
- Physiology
Background:
- Brain ischemia, a critical condition, impairs energy metabolism.
- Hepatocyte anoxia typically decreases fructose 2,6-bisphosphate.
- Understanding glycolysis regulation in brain ischemia is crucial.
Purpose of the Study:
- To investigate the role of fructose 2,6-bisphosphate in brain ischemia.
- To measure glycolytic intermediates and nucleotide concentrations during ischemia.
- To elucidate the compensatory mechanisms of glycolysis in vivo.
Main Methods:
- Inducing brain ischemia via bilateral common carotid artery ligation in spontaneously hypertensive rats.
- Measuring fructose 2,6-bisphosphate, glycolytic intermediates, and nucleotide concentrations in brain tissue.
- Analyzing changes during the early stages of ischemia.
Main Results:
- Fructose 2,6-bisphosphate content increased by 20-30% in early ischemia.
- This rise preceded elevations in fructose 1,6-bisphosphate and lactate.
- Pyridine and adenine nucleotide concentrations were also measured.
Conclusions:
- Fructose 2,6-bisphosphate plays a key role in accelerating glycolysis during brain ischemia.
- The observed increase suggests a compensatory metabolic response.
- This highlights a critical regulatory point in ischemic brain metabolism.