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Caveolin-1 deficiency increases cerebral ischemic injury
Jean-François Jasmin1, Samit Malhotra, Manjeet Singh Dhallu
1Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA.
Circulation Research
|February 13, 2007
Summary
Genetic ablation of caveolin-1 (Cav-1) exacerbates cerebral ischemic injury, leading to larger infarct volumes and impaired angiogenesis. This highlights Cav-1
Area of Science:
- Neuroscience
- Molecular Biology
- Cardiovascular Research
Background:
- Caveolins (Cav) are structural proteins in caveolar domains implicated in ischemic injury.
- Changes in caveolin expression are noted in renal and myocardial ischemia.
- Cav-1 gene ablation worsens hindlimb ischemia in mice, but its role in cerebral ischemia is unknown.
Purpose of the Study:
- To investigate the role of caveolin-1 (Cav-1) in the pathogenesis of cerebral ischemic injury.
- To determine the functional effects of Cav-1 deficiency in a mouse model of stroke.
Main Methods:
- Middle cerebral artery occlusion (MCAO) in rats to analyze Cav-1 and Cav-2 protein levels.
- Cerebral ischemia induction in caveolin knockout (Cav-1 KO, Cav-2 KO) and wild-type mice.
- Immunoblotting, immunofluorescence, and TUNEL analysis to assess infarct volume, cell proliferation, angiogenesis, and apoptosis.
Main Results:
- Cerebral ischemia increased endothelial Cav-1 and Cav-2 protein levels in rats.
- Cav-1 KO mice exhibited significantly larger cerebral infarct volumes compared to wild-type and Cav-2 KO mice.
- Cav-1 KO ischemic brains showed impaired angiogenesis and increased apoptotic cell death, with unchanged endothelial nitric oxide synthase levels.
Conclusions:
- Cerebral ischemia upregulates endothelial Cav-1 and Cav-2.
- Loss of Cav-1 function exacerbates cerebral ischemic injury by impairing angiogenesis and increasing apoptosis.
- Cav-1 plays a critical protective role in the brain during ischemic events.
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