Summary
Acute brain ischemia after subarachnoid hemorrhage (SAH) induces oxidative stress in brain tissues. Up-regulated NADPH oxidase (NOX), a major enzymatic source of superoxide anion in the brain, may contribute to early brain injury after SAH. We evaluated the effects of hyperbaric oxygen (HBO) on protein expression of gp91phox catalytic subunit of NOX, lipid peroxidation as a marker of oxidative stress, and on neurological and neuropathological outcomes after SAH.
Twenty-nine male Sprague-Dawley rats (300 to 350 g) were randomly allocated to control (sham operation), SAH (endovascular perforation), and SAH treated with HBO groups (2.8 ATA for 2 hours, at 1 hour after SAH). Cerebral blood flow was measured using laser Doppler flowmetry. Rats were sacrificed after 24 hours and brain tissues collected for histology (Nissl staining and gp91phox immunohistochemistry) and biochemistry. Mortality and neurological scores were evaluated.
Neuronal injury associated with enhanced gp91phox immunostaining was observed in the cerebral cortex after SAH. The lipid peroxidation product, malondialdehyde, accumulated in the ipsilateral cerebral cortex. HBO treatment reduced expression of NOX, diminished lipid peroxidation, and reduced neuronal damage. HBO caused a drop in mortality and ameliorated functional deficits.
HBO-induced neuroprotection after SAH may involve downregulation of NOX and a subsequent reduction in oxidative stress.
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Ostrowski, R.P., Colohan, A.R.T., Zhang, J.H. (2006). Neuroprotective effect of hyperbaric oxygen in a rat model of subarachnoid hemorrhage. In: Hoff, J.T., Keep, R.F., Xi, G., Hua, Y. (eds) Brain Edema XIII. Acta Neurochirurgica Supplementum, vol 96. Springer, Vienna. https://doi.org/10.1007/3-211-30714-1_41
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DOI: https://doi.org/10.1007/3-211-30714-1_41
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