Abstract
To examine the role of heme oxygenase (HO)-1 in the pathophysiology of vascular diseases, we generated mice deficient in both HO-1 and apolipoprotein E (HO-1-/-apoE-/-). Despite similar total plasma cholesterol levels in response to hypercholesterolemia, HO-1-/-apoE-/- mice, in comparison with HO-1+/+apoE-/- mice, had an accelerated and more advanced atherosclerotic lesion formation. In addition to greater lipid accumulation, these advanced lesions from HO-1-/-apoE-/- mice contained macrophages and smooth muscle alpha-actin-positive cells. We further tested the role of HO-1 on neointimal formation in a mouse model of vein graft stenosis. Autologous vein grafts in HO-1-/- mice showed robust neointima consisting of alpha-actin-positive vascular smooth muscle cells (VSMC) 10 days after surgery in comparison to the smaller neointima formed in autologous vein grafts in HO-1+/+ mice. However, at 14 days after surgery, the neointima from composite vessels of HO-1-/- mice was composed mainly of acellular material, indicative of substantial VSMC death. VSMC isolated from HO-1-/- mice were susceptible to oxidant stress, leading to cell death. Our data demonstrate that HO-1 plays an essential protective role in the pathophysiology of atherosclerosis and vein graft stenosis.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1759-1761 |
| Number of pages | 3 |
| Journal | The FASEB journal : official publication of the Federation of American Societies for Experimental Biology |
| Volume | 17 |
| Issue number | 12 |
| DOIs | |
| State | Published - Sep 2003 |
| Externally published | Yes |
ASJC Scopus subject areas
- Biotechnology
- Biochemistry
- Molecular Biology
- Genetics