| First Author | Wenzel P | Year | 2008 |
| Journal | Biochem Biophys Res Commun | Volume | 367 |
| Issue | 1 | Pages | 137-43 |
| PubMed ID | 18157936 | Mgi Jnum | J:130920 |
| Mgi Id | MGI:3772541 | Doi | 10.1016/j.bbrc.2007.12.089 |
| Citation | Wenzel P, et al. (2008) ALDH-2 deficiency increases cardiovascular oxidative stress--evidence for indirect antioxidative properties. Biochem Biophys Res Commun 367(1):137-43 |
| abstractText | Mitochondrial aldehyde dehydrogenase (ALDH-2) reduces reactive oxygen species (ROS) formation related to toxic aldehydes; additionally, it provides a bioactivating pathway for nitroglycerin. Since acetaldehyde, nitroglycerin, and doxorubicin treatment provoke mitochondrial oxidative stress, we used ALDH-2(-/-) mice and purified recombinant human ALDH-2 to test the hypothesis that ALDH-2 has an indirect antioxidant function in mitochondria. Antioxidant capacity of purified ALDH-2 was comparable to equimolar doses of glutathione, cysteine, and dithiothreitol; mitochondrial oxidative stress was comparable in C57Bl6 and ALDH-2(-/-) mice after acute challenges with nitroglycerin or doxorubicin, whereas chronic acetaldehyde, nitroglycerin, and doxorubicin treatment dose-dependently increased mitochondrial ROS formation and impaired endothelial function to a greater extent in ALDH-2(-/-) mice. Maximal nitroglycerin dose applied in vivo lead to a 'super-desensitized' nitroglycerin response in isolated ALDH-2(-/-) aortas, inaccessible in C57Bl6 mice. Our results suggest that ALDH-2 has an indirect antioxidative property independent of its thiol-moiety in disease states of cardiovascular oxidative stress. |
