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Neurochem Res. 2009 May;34(5):807-18. doi: 10.1007/s11064-008-9833-3. Epub 2008 Aug 27.

Synaptic vesicle-bound pyruvate kinase can support vesicular glutamate uptake.

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  • 1Molecular and Behavioral Neuroscience Institute, University of Michigan Medical School, BSRB, Ann Arbor, MI 48109-2200, USA.

Abstract

Glucose metabolism is essential for normal brain function and plays a vital role in synaptic transmission. Recent evidence suggests that ATP synthesized locally by glycolysis, particularly via glyceraldehyde 3-phosphate dehydrogenase/3-phosphoglycerate kinase, is critical for synaptic transmission. We present evidence that ATP generated by synaptic vesicle-associated pyruvate kinase is harnessed to transport glutamate into synaptic vesicles. Isolated synaptic vesicles incorporated [(3)H]glutamate in the presence of phosphoenolpyruvate (PEP) and ADP. Pyruvate kinase activators and inhibitors stimulated and reduced PEP/ADP-dependent glutamate uptake, respectively. Membrane potential was also formed in the presence of pyruvate kinase activators. "ATP-trapping" experiments using hexokinase and glucose suggest that ATP produced by vesicle-associated pyruvate kinase is more readily used than exogenously added ATP. Other neurotransmitters such as GABA, dopamine, and serotonin were also taken up into crude synaptic vesicles in a PEP/ADP-dependent manner. The possibility that ATP locally generated by glycolysis supports vesicular accumulation of neurotransmitters is discussed.

PMID:
18751889
[PubMed - indexed for MEDLINE]
PMCID:
PMC2659335
Free PMC Article
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