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(Stroke. 2001;32:980.)
© 2001 American Heart Association, Inc.
Original Contributions |
Mevastatin, an HMG-CoA Reductase Inhibitor, Reduces Stroke Damage and Upregulates Endothelial Nitric Oxide Synthase in Mice
From the Stroke and Neurovascular Regulation Laboratory, Massachusetts General Hospital, Harvard Medical School, Charlestown, Mass (S.A-H., N.E.S., M.Y., M.A.M.); Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Charlestown, Mass (N.E.S., P.H.); and Cardiovascular Division, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass (J.K.L.).
Correspondence to Michael A. Moskowitz, MD, Stroke and Neurovascular Regulation Laboratory, Massachusetts General Hospital, Harvard Medical School, 149 13th St, Room 6403, Charlestown, MA 02129. E-mail moskowit{at}helix.mgh.harvard.edu
Background and Purpose—The 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) lower serum cholesterol and decrease the incidence of stroke and cardiovascular disease. There is growing evidence that statins exert some of their beneficial effects independent of cholesterol lowering. Indeed, we have previously demonstrated that chronic simvastatin administration upregulates endothelial nitric oxide synthase (eNOS), resulting in more functional protein, augmentation of cerebral blood flow, and neuroprotection in a murine model of cerebral ischemia. In this report we examined whether another member of the statin family shared these effects and whether eNOS upregulation is sustained with longer treatment.
Methods—Mevastatin (2 mg/kg or 20 mg/kg per day) was administered to 18- to 22-g male mice for 7, 14, or 28 days before 2-hour middle cerebral artery occlusion with the use of the filament model (n=9 to 12). Neurological deficits and cerebral infarct volumes were assessed at 24 hours. Arterial blood pressure and gases, relative cerebral blood flow, and blood cholesterol levels were monitored in a subset of animals (n=5). Absolute cerebral blood flow was measured by the [14C]iodoamphetamine indicator fractionation technique (n=6). eNOS mRNA and protein levels were determined.
Results—Mevastatin increased levels of eNOS mRNA and protein, reduced infarct size, and improved neurological deficits in a dose- and time-dependent manner. Greatest protection was seen with 14- and 28-day high-dose treatment (26% and 37% infarct reduction, respectively). Cholesterol levels were reduced only after 28 days of treatment and did not correlate with infarct reduction. Baseline absolute cerebral blood flow was 30% higher after 14-day high-dose treatment.
Conclusions—Chronic prophylactic treatment with mevastatin upregulated eNOS and augmented cerebral blood flow. These changes occurred in the absence of changes in serum cholesterol levels, were sustained for up to 1 month of treatment, and resulted in neuroprotection after middle cerebral artery occlusion.
Editorial Comment
Department of Neurology, Washington University School of Medicine, St Louis, Missouri
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