Neurophysiological changes of spiny neurons in rat neostriatum after transient forebrain ischemia: an in vivo intracellular recording and staining study

Neuroscience
Z C Xu

Abstract

The spontaneous activities, evoked postsynaptic potentials and membrane properties of spiny neurons in rat neostriatum were compared before, during and after 5-8 min ischemia using intracellular recording and staining techniques in vivo. Severe forebrain ischemia was induced with the four-vessel occlusion method. Approximately 2.5 min after the onset of ischemia the baseline membrane potential quickly depolarized to -20 mV and remained at this level during ischemia. Repolarization began within 2 min after recirculation. The onset of ischemic depolarization was directly related to the severity of ischemia and its latency was inversely related to brain temperature. Spontaneous firing and membrane potential fluctuation of spiny neurons ceased immediately after ischemia and slowly recovered several hours after recirculation. No neuronal hyperactivity was observed up to 7 h after recirculation. Cortically evoked inhibitory postsynaptic potentials and late depolarizations disappeared earlier after ischemia and recovered later following recirculation than the initial excitatory postsynaptic potentials. Membrane input resistance of spiny neurons was significantly increased but the time constant remained the same following recirculation...Continue Reading

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