Targeted detoxification of selected reactive oxygen species in the vascular endothelium.
Publication/Presentation Date
11-1-2009
Abstract
Oxidative stress underlies diverse vascular diseases, but its management remains elusive, in part because of our inability to selectively detoxify reactive oxygen species (ROS) in pathological sites and our limited understanding which species need to be eliminated. The antioxidant enzymes (AOEs) superoxide dismutase (SOD) and catalase (which decompose and H(2)O(2), respectively), conjugated with an antibody to platelet-endothelial cell adhesion molecule-1 (PECAM-1), bind to endothelial cells and alleviate oxidative stress in cell culture models. Here, we studied the effects of these antioxidant conjugates in mouse models of vascular oxidative stress. Anti-PECAM/catalase and anti-PECAM/SOD conjugates, in contrast to control IgG/AOE conjugates, accumulated in the lungs and vascularized organs after intravenous injection in wild-type, but not PECAM KO mice. Anti-PECAM/catalase, but not anti-PECAM/SOD, protected mice from lung injury induced by H(2)O(2) produced by glucose oxidase deposited in the pulmonary vasculature. Anti-PECAM/catalase also reduced alveolar edema and attenuated decline in arterial oxygen in mice that underwent unilateral lung ischemia/reperfusion, whereas anti-PECAM/SOD was not effective, implying the key role of H(2)O(2) in tissue damage in this pathology. In contrast, anti-PECAM/SOD, but not anti-PECAM/catalase prevented oxidation of tetrahydrobiopterin and normalized vasoreactivity in the vessels of mice rendered hypertensive by pretreatment with angiotensin-II. This outcome agrees with reports implicating superoxide and peroxynitrite in altered endothelium-dependent vasodilatation in hypertension. Therefore, the use of endothelial cell-targeted antioxidants identifies the key specific species of ROS involved in various forms of vascular disease and holds promise for the mechanistically tailored treatment of these pathologies.
Volume
331
Issue
2
First Page
404
Last Page
411
ISSN
1521-0103
Published In/Presented At
Shuvaev, V. V., Christofidou-Solomidou, M., Bhora, F., Laude, K., Cai, H., Dikalov, S., Arguiri, E., Solomides, C. C., Albelda, S. M., Harrison, D. G., & Muzykantov, V. R. (2009). Targeted detoxification of selected reactive oxygen species in the vascular endothelium. The Journal of pharmacology and experimental therapeutics, 331(2), 404–411. https://doi.org/10.1124/jpet.109.156877
Disciplines
Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods
PubMedID
19692634
Department(s)
Administration and Leadership
Document Type
Article