期刊
JOURNAL OF INORGANIC BIOCHEMISTRY
卷 102, 期 12, 页码 2130-2135出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2008.08.001
关键词
Iron; Oxidative stress; Reactive oxygen species; Fenton chemistry; Chelation therapy
资金
- Duke University's Arts and Sciences Faculty Committee on Research
- NIH [EY018922]
- Alfred P. Sloan Research Fellowship
- NSF
Dysregulation of localized iron homeostasis is implicated in several degenerative diseases, including Parkinson's, Alzheimer's, and age-related macular degeneration, wherein iron-mediated oxidative stress is hypothesized to contribute to cell death. Inhibiting toxic iron without altering normal metal-dependent processes presents significant challenges for standard small molecule chelating agents. We previously introduced BSIH (isonicotinic acid [2-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzylidene]hydrazide) prochelators that are converted by hydrogen peroxide into SIH (salicylaldehyde isonicotinoyl hydrazone) chelating agents that inhibit iron-catalyzed hydroxyl radical generation. Here, we show that BSIH protects a cultured cell model for retinal pigment epithelium against cell death induced by hydrogen peroxide. BSIH is more stable than SIH in cell culture medium and is more protective during long-term experiments. Repetitive exposure of cells to BSIH is nontoxic, whereas SIH and desferrioxamine induce cell death after repeated exposure. Combined, our results indicate that cell protection by BSIH involves iron sequestration that occurs only when the cells are stressed by hydrogen peroxide. These findings suggest that prochelators discriminate toxic iron from healthy iron and are promising candidates for neuro- and retinal protection. (C) 2008 Elsevier Inc. All rights reserved.
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