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Journal Article
Research Support, Non-U.S. Gov't
Continuous real-time measurement of extracellular ascorbate release in the rat striatum in vivo during forebrain ischemia-reperfusion.
Neuroscience Letters 2000 October 28
Apart from its physiological role as a major antioxidant, ascorbate is highly concentrated in neuropils and ascorbate-mediated protection from excitotoxins has been demonstrated in vitro. Therefore, extracellular release of ascorbate during the early stage of ischemia-reperfusion was measured using a microdialysis electrode technique. One or two probes of the microdialysis biosensor were inserted into the rat striatum. One probe (n=16) was perfused with phosphate-buffered saline (PBS) for continuous oxidative signal recording. A second electropolymerised probe inserted into the other side of the striatum was perfused with PBS containing ascorbate oxidase in six rats. Forebrain ischemia-reperfusion was performed for 10min, followed by reperfusion for 60min. Ascorbate increased transiently during ischemia, and markedly to a maximum of 247.5+/-55. 8 microM from the baseline of 68.5+/-25.3 microM after reperfusion. The marked increase of extracellular ascorbate may be a marker of the early stage of reperfusion.
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