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• W2016071574 abstract "Using rat hippocampus we have studied the pattern of neuronal death, abnormal discharge and loss of electrical excitability in slices prepared from animals subjected to bilateral, four-vessel cerebral anoxia and in slices prepared from normal animals that are subjected to anoxia in the recording chamber. As others have reported, pyramidal neurons in area CA1 are lost first after anoxia, while CA3 neurons have an intermediate sensitivity, and those in dentate are relatively anoxia-resistant. After anoxic damage to the intact animal, neurons in both CA1 and CA3 show abnormal bursting discharges in response to synaptic activation for several days, and then the response in CA1 decreases in amplitude and finally the area become unexcitable. While antagonists for N-methyl-d-aspartate (NMDA) receptors have essentially no effect on synaptic responses in control animals, they reduce the bursting responses and greatly depress the small responses in CA1 as neurons are becoming unexcitable after anoxia. With intracellular recording CA1 neurons from animals made transiently anoxic, in contrast to controls, show prolonged synaptic responses, the later components of which are blocked by NMDA antagonists. When slices from normal animals are subjected to anoxia such that excitability is totally lost over a period of about 10 min, there is no significant membrane depolarization during the anoxic episode and recovery of excitability occurs with reoxygenation. However, a period of hyperexcitability and bursting follows and electrical excitability is lost in CA1 but not CA3 neurons after about 90 min. Both the bursting and loss of CA1 excitability are prevented by application of amino phosphono-valeric acid (APV) or phencyclidine (PCP) during the anoxic episode. With intracellular recording CA1 neurons from slices made transiently anoxic but not from control slices show prolonged, APV-sensitive synaptic potentials. These observations suggest that in both in vivo and in vitro preparations a critical effect of transient anoxia is the induction of previously absent NMDA receptors and that the trigger for this induction is not voltage dependent." @default.
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• W2016071574 date "1991-06-01" @default.
• W2016071574 modified "2023-10-10" @default.
• W2016071574 title "Appearance of NMDA receptors triggered by anoxia independent of voltage in vivo and in vitro" @default.
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• W2016071574 doi "https://doi.org/10.1016/0014-4886(91)90131-u" @default.
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