Hertz L, Swanson RA, Newman GC, Marrif H, Juurlink BH, Peng L. Can experimental conditions explain the discrepancy over glutamate stimulation of aerobic glycolysis?
Dev Neurosci 2000;
20:339-47. [PMID:
9778570 DOI:
10.1159/000017329]
[Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Uncertainty reigns over whether or not glutamate uptake in astrocytes leads to strong stimulation of glucose utilization, measured as accumulation of radioactive deoxyglucose-6-phosphate. This is an important issue, not only because glutamate is the major excitatory transmitter, but also because it has been postulated that glutamate-induced stimulation of glycolysis links brain excitation with activation of energy production. The effect of glutamate on deoxyglucose utilization in cultured rat and mouse astrocytes grown in different media and incubated under various conditions during the deoxyglucose assay has, therefore, been studied. Under most conditions, no stimulation occurred but rather a decrease in deoxyglucose utilization during exposure to glutamate; under certain conditions, the contribution of non-metabolized deoxyglucose to the intracellular 14C signal was significant.
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