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• W2087134621 abstract "Excitatory synaptic transmission stimulates brain tissue glycolysis. This phenomenon is the signal detected in FDG-PET imaging and, through enhanced lactate production, is also thought to contribute to the fMRI signal. Using a method based on Förster resonance energy transfer in mouse astrocytes, we have recently observed that a small rise in extracellular K(+) can stimulate glycolysis by >300% within seconds. The K(+) response was blocked by ouabain, but intracellular engagement of the Na(+)/K(+) ATPase pump with Na(+) was ineffective, suggesting that the canonical feedback regulatory pathway involving the Na(+) pump and ATP depletion is only permissive and that a second mechanism is involved. Because of their predominant K(+) permeability and high expression of the electrogenic Na(+)/HCO(3)(-) cotransporter NBCe1, astrocytes respond to a rise in extracellular K(+) with plasma membrane depolarization and intracellular alkalinization. In the present article, we show that a fast glycolytic response can be elicited independently of K(+) by plasma membrane depolarization or by intracellular alkalinization. The glycolytic response to K(+) was absent in astrocytes from NBCe1 null mice (Slc4a4) and was blocked by functional or pharmacological inhibition of the NBCe1. Hippocampal neurons acquired K(+)-sensitive glycolysis upon heterologous NBCe1 expression. The phenomenon could also be reconstituted in HEK293 cells by coexpression of the NBCe1 and a constitutively open K(+) channel. We conclude that the NBCe1 is a key element in a feedforward mechanism linking excitatory synaptic transmission to fast modulation of glycolysis in astrocytes." @default.
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• W2087134621 date "2011-10-05" @default.
• W2087134621 modified "2023-10-18" @default.
• W2087134621 title "NBCe1 Mediates the Acute Stimulation of Astrocytic Glycolysis by Extracellular K⁺" @default.
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• W2087134621 doi "https://doi.org/10.1523/jneurosci.2310-11.2011" @default.
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