Metabolic inhibition potentiates AMPA-induced Ca2+ fluxes and neurotoxicity in rat cerebellar granule cells

被引:22
作者
Cebers, G [1 ]
Cebere, A [1 ]
Liljequist, S [1 ]
机构
[1] Karolinska Hosp, Dept Clin Neurosci, Div Drug Dependence Res, S-17176 Stockholm, Sweden
关键词
AMPA; cerebellar granule cell; rat; metabolic inhibition; neurotoxicity; cyanide; NaCN; DNA fragmentation; glutamate; Ca2+](i);
D O I
10.1016/S0006-8993(97)01123-2
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The effects of partial metabolic inhibition (induced by 2 h exposure to low concentrations of cyanide (NaCN)) on the glutamate receptor agonist alpha-amino-3-hydroxy-5-methyl-3-isoxazolepropionate (AMPA)-induced excitotoxicity and elevation of free cytoplasmic Ca2+ levels ([Ca2+](i)) were studied in glucose-deprived primary cultures of cerebellar granule cells. Go-application of AMPA plus NaCN caused a marked increase of cell death, with morphological features of both necrotic and apoptotic cell death as estimated by the capacity of cultured cerebellar granule cells to metabolize 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide into formazan (MTT method), and by measuring the amount of DNA fragmentation in neurons using an ELISA test for histone-bound DNA fragments, respectively. Cell morphology was assessed by confocal microscopy of propidium iodide-stained cultures. No toxic effects were observed when AMPA or a low concentration of NaCN (0.1-0.3 mM; in the presence of NMDA receptor antagonist MK-8011 10 mu M) were applied alone. The neurotoxic actions induced by AMPA plus NaCN were preceded and accompanied by a significant elevation of [Ca2+](i), as well as by depletion of neuronal ATP stores. The marked enhancement in the functional responsiveness of AMPA receptors in energetically compromised neurons suggests that at least under certain conditions AMPA receptors may play an important role in excitotoxic processes which might be of relevance for the slowly developing neuronal death seen in several neurodegenerative diseases. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:194 / 204
页数:11
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