期刊
METABOLIC BRAIN DISEASE
卷 30, 期 1, 页码 307-316出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11011-014-9524-5
关键词
Astrocytes; Glycogen; Potassium; Glutamate; Epilepsy
资金
- National Insititute of Health (NIH) [KL2 RR033182]
- University of Minnesota Clinical and Translational Science Institute (CTSI)
Epilepsy is a family of brain disorders with a largely unknown etiology and high percentage of pharmacoresistance. The clinical manifestations of epilepsy are seizures, which originate from aberrant neuronal synchronization and hyperexcitability. Reactive astrocytosis, a hallmark of the epileptic tissue, develops into loss-of-function of glutamine synthetase, impairment of glutamate-glutamine cycle and increase in extracellular and astrocytic glutamate concentration. Here, we argue that chronically elevated intracellular glutamate level in astrocytes is instrumental to alterations in the metabolism of glycogen and leads to the synthesis of polyglucosans. Unaccessibility of glycogen-degrading enzymes to these insoluble molecules compromises the glycogenolysis-dependent reuptake of extracellular K+ by astrocytes, thereby leading to increased extracellular K+ and associated membrane depolarization. Based on current knowledge, we propose that the deterioration in structural homogeneity of glycogen particles is relevant to disruption of brain K+ homeostasis and increased susceptibility to seizures in epilepsy.
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