NF-E2-Related Factor 2 Promotes Atherosclerosis by Effects on Plasma Lipoproteins and Cholesterol Transport That Overshadow Antioxidant Protection

被引:137
作者
Barajas, Berenice
Che, Nam
Yin, Fen
Rowshanrad, Amir
Orozco, Luz D.
Gong, Ke Wei
Wang, Xuping
Castellani, Lawrence W.
Reue, Karen [2 ]
Lusis, Aldons J.
Araujo, Jesus A. [1 ]
机构
[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Med, Div Cardiol,Ctr Hlth Sci 43 264, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Human Genet, Los Angeles, CA 90095 USA
关键词
atherosclerosis; cytokines; lipoproteins; reactive oxygen species; foam cell formation; lipogenesis; Nrf2; HUMAN-ENDOTHELIAL-CELLS; TRANSCRIPTION FACTORS; SCAVENGER RECEPTOR; OXIDATIVE STRESS; GENE-EXPRESSION; NADPH OXIDASE; IN-VIVO; NRF2; MICE; MUSCLE;
D O I
10.1161/ATVBAHA.110.210906
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective-To test the hypothesis that NF-E2-related factor 2 (Nrf2) expression plays an antiatherogenic role by its vascular antioxidant and anti-inflammatory properties. Methods and Results-Nrf2 is an important transcription factor that regulates the expression of phase 2 detoxifying enzymes and antioxidant genes. Its expression in vascular cells appears to be an important factor in the protection against vascular oxidative stress and inflammation. We developed Nrf2 heterozygous (HET) and homozygous knockout (KO) mice on an apolipoprotein (apo) E-null background by sequential breeding, resulting in Nrf2(-/-), apoE(-/-) (KO), Nrf2(-/+), apoE(-/-) (HET) and Nrf2(+/+), and apoE(-/-) wild-type littermates. KO mice exhibited decreased levels of antioxidant genes with evidence of increased reactive oxygen species generation compared with wild-type controls. Surprisingly, KO males exhibited 47% and 53% reductions in the degree of aortic atherosclerosis compared with HET or wild-type littermates, respectively. Decreased atherosclerosis in KO mice correlated with lower plasma total cholesterol in a sex-dependent manner. KO mice also had a decreased hepatic cholesterol content and a lower expression of lipogenic genes, suggesting that hepatic lipogenesis could be reduced. In addition, KO mice exhibited atherosclerotic plaques characterized by a lesser macrophage component and decreased foam cell formation in an in vitro lipid-loading assay. This was associated with a lower rate of cholesterol influx, mediated in part by decreased expression of the scavenger receptor CD36. Conclusion-Nrf2 expression unexpectedly promotes atherosclerotic lesion formation in a sex-dependent manner, most likely by a combination of systemic metabolic and local vascular effects. (Arterioscler Thromb Vasc Biol. 2011;31:58-66.)
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页码:58 / +
页数:33
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