OBJECTIVE: In the present study, MRI has been used to investigate therapeutic intervention with statins in a model of permanent focal cerebral ischemia in rat. METHODS AND RESULTS: Brain ischemia was induced in rats by the permanent occlusion of middle cerebral artery (MCAO) and the brain infarct size followed up in alive animals 2, 24, and 48 hours after MCAO, using the trace of apparent diffusion coefficient [Tr(D)] maps and T2-weighted images. In vehicle-treated rats, the infarct volumes increased by 38.5% and 89% after 24 and 48 hours, respectively, compared with the damage detected at 2 hours after MCAO. Treatment with simvastatin (20 mg/kg) after MCAO prevented the increase in brain infarct volume occurring at 24 hours and induced a 46.6% reduction after 48 hours. This effect was similar to that observed when simvastatin was administered before the induction of focal ischemia. T2W-MRI images confirmed these findings. The neuroprotective effects of simvastatin were paralleled by an increase in endothelial NO synthase immunoreactivity, detectable in the brain of simvastatin-treated rats. CONCLUSIONS: Statins, in addition to their preventive effect on cerebral ischemia, exert a neuroprotective role in the attenuation of brain damage after acute stroke.
OBJECTIVE: In the present study, MRI has been used to investigate therapeutic intervention with statins in a model of permanent focal cerebral ischemia in rat. METHODS AND RESULTS:Brain ischemia was induced in rats by the permanent occlusion of middle cerebral artery (MCAO) and the brain infarct size followed up in alive animals 2, 24, and 48 hours after MCAO, using the trace of apparent diffusion coefficient [Tr(D)] maps and T2-weighted images. In vehicle-treated rats, the infarct volumes increased by 38.5% and 89% after 24 and 48 hours, respectively, compared with the damage detected at 2 hours after MCAO. Treatment with simvastatin (20 mg/kg) after MCAO prevented the increase in brain infarct volume occurring at 24 hours and induced a 46.6% reduction after 48 hours. This effect was similar to that observed when simvastatin was administered before the induction of focal ischemia. T2W-MRI images confirmed these findings. The neuroprotective effects of simvastatin were paralleled by an increase in endothelial NO synthase immunoreactivity, detectable in the brain of simvastatin-treated rats. CONCLUSIONS: Statins, in addition to their preventive effect on cerebral ischemia, exert a neuroprotective role in the attenuation of brain damage after acute stroke.
Authors: Minoru Asahi; Zhihong Huang; Sunu Thomas; Shin-ichi Yoshimura; Toshihisa Sumii; Tatsuro Mori; Jianhua Qiu; Sepideh Amin-Hanjani; Paul L Huang; James K Liao; Eng H Lo; Michael A Moskowitz Journal: J Cereb Blood Flow Metab Date: 2005-06 Impact factor: 6.200
Authors: P Urban; M Pavlíková; M Sivonová; P Kaplán; Z Tatarková; B Kaminska; J Lehotský Journal: Cell Mol Neurobiol Date: 2008-09-19 Impact factor: 5.046
Authors: Mitchell S V Elkind; Ralph L Sacco; Robert B Macarthur; Ellinor Peerschke; Greg Neils; Howard Andrews; Joshua Stillman; Tania Corporan; Dana Leifer; Rui Liu; Ken Cheung Journal: Cerebrovasc Dis Date: 2009-07-16 Impact factor: 2.762