4.6 Article

Antioxidant CR-6 protects against reperfusion injury after a transient episode of focal brain ischemia in rats

Journal

JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
Volume 30, Issue 3, Pages 638-652

Publisher

SAGE PUBLICATIONS INC
DOI: 10.1038/jcbfm.2009.237

Keywords

antioxidants; hyperemia; ischemia; middle cerebral artery; reperfusion; stroke

Funding

  1. Ministerio de Educacion y Ciencia [SAF2005-05793-CO1, SAF2008-04515-C01, SAF2007-60406, SAF2008-00048]
  2. European Community [LSHB-CT2005- 512146]
  3. FP7/2007-2013 [201024]

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Oxidative and nitrosative stress are targets for intervention after ischemia/reperfusion. The aim of this study was to explore the effect of CR-6, a vitamin-E analogue that is antioxidant and scavenger of nitrogen-reactive species. Sprague-Dawley rats had the middle cerebral artery (MCA) occluded either for 90 mins or permanently. Cortical perfusion was continuously monitored by laser-Doppler flowmetry. CR-6 (100 mg/kg) was administered orally either at 2 and 8 h after MCA occlusion, or at 2 h only. Infarct volume, neurological deficit, and signs of reperfusion injury were evaluated. CR-6 was detected in plasma and brain by HPLC. CR-6 reduced glutathione consumption in the ischemic brain and superoxide generation in the isolated MCA. CR-6 decreased infarct volume and attenuated the neurological deficit at 1 and 7 days after ischemia/reperfusion, but not after permanent ischemia. Immediately after reperfusion, cortical blood flow values returned to their baseline (+/- 20%) in several animals, whereas others showed hyper-perfusion (> 20% of baseline). Reactive hyperemia was associated with adverse events such as increased cortical BBB leakage, edema, protein nitrotyrosination, COX-2 expression, and neutrophil accumulation; and with a poorer outcome, and CR-6 attenuated these effects. In conclusion, oral CR-6 administration after transient ischemia protects the brain from reperfusion injury. Journal of Cerebral Blood Flow & Metabolism (2010) 30, 638-652; doi: 10.1038/jcbfm.2009.237; published online 11 November 2009

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