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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nemet, Ina Monnier, Vincent M. Fan, Xingjun Strauch, Christopher Qian, Juan Zhang, Jianye Theves, Mathilde Giblin, Frank J. Liu, Xiaoqin |
| Description | Author Affiliation: Fan X ( Department of Pathology, Case Western Reserve University, Cleveland, Ohio 44106 , USA.) |
| Abstract | Oxidative mechanisms during nuclear sclerosis of the lens are poorly understood, in particular metal-catalyzed oxidation. The lysyl oxidation product adipic semialdehyde (allysine, ALL) and its oxidized end-product 2-aminoadipic acid (2-AAA) were determined as a function of age and presence of diabetes. Surprisingly, whereas both ALL and 2-AAA increased with age and strongly correlated with cataract grade and protein absorbance at 350 nm, only ALL formation but not 2-AAA was increased by diabetes. To clarify the mechanism of oxidation, rabbit lenses were treated with hyperbaric oxygen (HBO) for 48 h, and proteins were analyzed by gas and liquid chromatography mass spectrometry for ALL, 2-AAA, and multiple glycation products. Upon exposure to HBO, rabbit lenses were swollen, and nuclei were yellow. Protein-bound ALL increased 8-fold in the nuclear protein fractions versus controls. A dramatic increase in methyl-glyoxal hydroimidazolone and carboxyethyl-lysine but no increase of 2-AAA occurred, suggesting more drastic conditions are needed to oxidize ALL into 2-AAA. Indeed the latter formed only upon depletion of glutathione and was catalyzed by H(2)O(2). Neither carboxymethyl-lysine nor glyoxal hydroimidazolone, two markers of glyco-/lipoxidation, nor markers of lenticular glycemia (fructose-lysine, glucospane) were elevated by HBO, excluding significant lipid peroxidation and glucose involvement. The findings strongly implicate dicarbonyl/metal catalyzed oxidation of lysine to allysine, whereby low GSH combined with ascorbate-derived H(2)O(2) likely contributes toward 2-AAA formation, since virtually no 2-AAA formed in the presence of methylglyoxal instead of ascorbate. An important translational conclusion is that chelating agents might help delay nuclear sclerosis. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 50 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-12-11 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Aging Physiology Crystallins Metabolism Diabetes Mellitus Lens, Crystalline Lysine 2-Aminoadipic Acid Analogs & Derivatives Adolescent Animals Chemistry Genetics Pathology Hydrogen Peroxide Hyperbaric Oxygenation Leucine Mice Mice, Inbred C57BL Molecular Structure Oxidants Oxidation-Reduction Rabbits Regression Analysis Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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