期刊
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY
卷 27, 期 6, 页码 1375-1382出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/ATVBAHA.107.142109
关键词
atherosclerosis; glutathione; macrophage; oxidized low-density lipoprotein; oxidative stress
资金
- NHLBI NIH HHS [HL-70963] Funding Source: Medline
Objective-Thiol oxidative stress leads to macrophage dysfunction and cell injury, and has been implicated in the development of atherosclerotic lesions. We investigated if strengthening the glutathione-dependent antioxidant system in macrophages by overexpressing glutathione reductase (GR) decreases the severity of atherosclerosis. Methods and Results-Bone marrow cells infected with retroviral vectors expressing either enhanced green fluorescent protein (EGFP) or an EGFP-fusion protein of cytosolic GR (GR(cyto)-EGFP) or mitochondrial GR (GR(mito)-EGFP) were transplanted into low-density lipoprotein receptor-deficient mice. Five weeks after bone marrow transplantation, animals were challenged with a Western diet for 10 weeks. No differences in either plasma cholesterol and triglyceride levels or peritoneal macrophage content were observed. However, mice reconstituted with either GR(cyto)-EGFP or GR(mito)-EGFP-expressing bone marrow had lesion areas (P<0.009) that were 32% smaller than recipients of EGFP-expressing bone marrow. In cultured macrophages, adenovirus-mediated overexpression of GR(cyto)-EGFP or GR(mito)-EGFP protected cells from mitochondrial hyperpolarization induced by oxidized low-density lipoprotein. Conclusion-This study provides direct evidence that the glutathione-dependent antioxidant system in macrophages plays a critical role in atherogenesis, and suggests that thiol oxidative stress-induced mitochondrial dysfunction contributes to macrophage injury in atherosclerotic lesions.
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