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This study was designed to determine whether Bach1 gene ablation leads to suppression of atherosclerosis in apolipoprotein E (Apo E)/Bach1 double knockout (DKO) mice. Apo E/Bach1 DKO mice were generated by intercrossing Apo E knockout (KO) and Bach1 KO mice. The animals were fed a high-fat diet for 8 weeks, and the atherosclerotic plaques in the thoracic and abdominal aorta were visualized by oil red O staining. In DKO mice, the total plaque area was reduced by 32% compared with that in Apo E KO mice. In DKO mice, heme oxygenase-1 (HO-1) was upregulated in the endothelium and, to a lesser extent, in vascular smooth muscles. In atherosclerotic plaques in Apo E KO mice and DKO mice, HO-1 was abundantly expressed in the endothelium and macrophages. Urine excretion of 8-iso-prostaglandin (PG) F2alpha, a marker for lipid peroxidation, was reduced in DKO mice compared with that in Apo E KO mice. The effects of Bach1 ablation on the plaque area and 8-iso-PG F2alpha excretion were almost completely abolished by treating DKO mice with Sn protoporphyrin, an inhibitor of HO activity. Disruption of the Bach1 gene in Apo E KO mice caused inhibition of atherosclerosis through upregulation of HO-1. Inhibition of Bach1, conversely, may be a novel therapeutic strategy to treat atherosclerotic diseases.

Ablation of the Bach1 Gene Leads to the Suppression of Atherosclerosis in Bach1 and Apolipoprotein E Double Knockout Mice