Article: article from journal or magazin.
Deficiency of glutathione peroxidase-1 accelerates the progression of atherosclerosis in apolipoprotein E-deficient mice
Arteriosclerosis Thrombosis and Vascular Biology
PT - Journal Article PT - Research Support, Non-U.S. Gov't
BACKGROUND: We have recently demonstrated that activity of red blood cell glutathione peroxidase-1 is inversely associated with the risk of cardiovascular events in patients with coronary artery disease. The present study analyzed the effect of glutathione peroxidase-1 deficiency on atherogenesis in the apolipoprotein E-deficient mouse. METHODS AND RESULTS: Female apolipoprotein E-deficient mice with and without glutathione peroxidase-1 deficiency were placed on a Western-type diet for another 6, 12, or 24 weeks. After 24 weeks on Western-type diet, double-knockout mice (GPx-1(-/-)ApoE(-/-)) developed significantly more atherosclerosis than control apolipoprotein E-deficient mice. Moreover, glutathione peroxidase-1 deficiency led to modified atherosclerotic lesions with increased cellularity. Functional experiments revealed that glutathione peroxidase-1 deficiency leads to increased reactive oxygen species concentration in the aortic wall as well as increased overall oxidative stress. Peritoneal macrophages from double-knockout mice showed increased in vitro proliferation in response to macrophage-colony-stimulating factor. Also, we found lower levels of bioactive nitric oxide as well as increased tyrosine nitration as a marker of peroxynitrite production. CONCLUSIONS: Deficiency of an antioxidative enzyme accelerates and modifies atherosclerotic lesion progression in apolipoprotein E-deficient mice
Animals/Aorta/metabolism/Apolipoproteins E/deficiency/Apoptosis/Atherosclerosis/etiology/Pathology/physiopathology/Blood Pressure/Cell Proliferation/Disease Progression/Female/Glutathione Peroxidase/Lipoproteins/blood/Membranes/Mice/Mice,Knockout/Mitochondria,Heart/Monocytes/Nitric Oxide/biosynthesis/Oxidation-Reduction/Peroxynitrous Acid/Phenotype/Reactive Oxygen Species/Superoxides
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