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Glutamate–glutamine Cycling in the Epileptic Human Hippocampus

Summary:  Purpose: Several findings suggest that energy metabolism and the glutamate–glutamine cycle may be impaired in epilepsy. Positron emission tomography often shows interictal hypometabolism of the epileptogenic hippocampus. In vivo microdialysis studies show that seizure‐associated glutamate release is doubled, and clearance is slowed. We hypothesized that the glutamate–glutamine cycle between neurons and glia may be decreased in the epileptic human hippocampus.