Extracellular acidic sulfur-containing amino acids and gamma-glutamyl peptides in global ischemia: postischemic recovery of neuronal activity is paralleled by a tetrodotoxin-sensitive increase in cysteine sulfinate in the CA1 of the rat hippocampus.
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| Abstract |
An excessive activation of the excitatory amino acid system has been proposed as one possible mediator of the ischemia-induced delayed death of CA1 pyramidal cells in the hippocampus. Using dialytrodes in the CA1 of the rat, we have investigated multiple-unit activity and extracellular changes in acidic sulfur-containing amino acids and gamma-glutamyl peptides during ischemia (20-min, four-vessel occlusion) and during 8 h of reflow. Multiple-unit activity was abolished during ischemia and for the following 1 h, but then recovered, gradually reaching preischemic levels after 8 h of reflow. Extracellular cysteate, cysteine sulfinate, and gamma-glutamyltaurine increased (1.5- to threefold) during ischemia, and extracellular glutathione and gamma-glutamylaspartate plus gamma-glutamylglutamine increased during early reflow (two- to threefold). The recovery of neuronal activity at 4-8 h was paralleled by an increase in extracellular cysteine sulfinate (2.5-fold at 8 h of reflow). Perfusion with 10 microM tetrodotoxin at 8 h of reflow abolished the multiple-unit activity and reduced extracellular cysteine sulfinate. Considering the glutamate-like properties of cysteine sulfinate, the observed postischemic increase may be involved in the development of the delayed neuronal death.
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| Authors | P Andiné, O Orwar, I Jacobson, M Sandberg, H Hagberg |
| Journal | Journal of neurochemistry (J Neurochem) Vol. 57 Issue 1 Pg. 230-6 (Jul 1991) ISSN: 0022-3042 [Print] England |
| PMID | 2051166 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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