Evidence for formation of hydroxyl radicals during reperfusion after global cerebral ischaemia in rats using salicylate trapping and microdialysis

Neurobiology of Disease
T ChristensenN H Diemer

Abstract

Systemic administration of salicylate (SA) to rats (100 mg kg-1 i.p. ) was used as an in vivo trap of hydroxyl radicals (.OH). In the brain SA reacts with hydroxyl radicals to form the stable adducts 2, 3- and 2,5 dihydroxybenzoic acid (DHBAs) which can thus be taken as an index of .OH formation. The DHBAs were recovered by intracerebral microdialysis in hippocampus or striatum and quantified by high pressure liquid chromatography (HPLC) with electrochemical detection. There were no peaks corresponding to 2,5-DHBA or 2,3-DHBA in the chromatograms from rats not receiving SA. A basal level of 2,5-DHBA was seen in the dialysates from all animals given SA whereas 2, 3-DHBA was not detected. In one group of rats generation of free oxygen radicals was induced in the striatum by adding Fe2+ and ascorbate to the perfusion fluid to test the sensitivity of the system. Addition of Fe2+ ascorbate to the perfusion fluid induced a significant 7-fold increase in 2,5-DHBA that gradually returned to baseline after removal of Fe2+/ascorbate. In two other groups the microdialysis probes were implanted in either the striatum or the hippocampus and the animals were subjected to 20 min of four-vessel occlusion + hypotension (4-VOH). Significant redu...Continue Reading

Citations

Jul 7, 2009·Phytomedicine : International Journal of Phytotherapy and Phytopharmacology·P AguileraP D Maldonado
Jan 31, 2004·Brain Research·Christian BergerArmin Grau
Mar 20, 1998·Stroke; a Journal of Cerebral Circulation·T Kristián, B K Siesjö
Aug 20, 2004·Pharmacological Reviews·Graeme EisenhoferDavid S Goldstein
Dec 6, 2003·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Theresa L WellmanKaren M Lounsbury

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