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Abstract
Change of redox status is associated with colitis induced by dextran sodium sulphate (DSS). This study monitored redox status in DSS-induced colitis in mice using in vivo electron spin resonance (ESR) spectroscopy with nitroxyl probes. Colitis was induced in male ICR mice by supplementing their drinking water with 3% DSS for 3, 5 or 7 days. The ESR signal decay rate of carbamoyl-PROXYL administered into the rectum was enhanced by DSS treatment and the enhancement on day 7 was suppressed by membrane-permeable antioxidants, tiron and dimethylsulphoxide and a membrane-impermeable antioxidant, mannitol. The enhancement on day 5 was suppressed by tiron and dimethylsulphoxide, while that on day 3 was inhibited only by tiron. These results suggest that redox change occurs in or around of epithelial cells on day 7, but only intracellularly on day 5, and that redox change such as generation of less reactive radicals occurs only intracellularly on day 3.
| Abbreviations | ||
| CD | = | Crohn's disease |
| DFO | = | desferrioxamine |
| DMSO | = | dimethylsulphoxide |
| DSS | = | dextran sodium sulphate |
| ESR | = | electron spin resonance |
| IBD | = | inflammatory bowel diseases |
| iNOS | = | inducible nitric oxide synthase |
| NADPH | = | nicotinamide adenine dinucleotide phosphate |
| NO | = | nitric oxide |
| PROXYL | = | 2, 2, 5, 5-tetramethyl-pyrrolidine-1-oxyl |
| ROS | = | reactive oxygen species |
| TEMPO | = | 2, 2, 6, 6-tetramethyl-piperidine-1-oxyl |
| TNBS | = | trinitrobenzene sulphonic acid |
| UC | = | ulcerative colitis |
| Abbreviations | ||
| CD | = | Crohn's disease |
| DFO | = | desferrioxamine |
| DMSO | = | dimethylsulphoxide |
| DSS | = | dextran sodium sulphate |
| ESR | = | electron spin resonance |
| IBD | = | inflammatory bowel diseases |
| iNOS | = | inducible nitric oxide synthase |
| NADPH | = | nicotinamide adenine dinucleotide phosphate |
| NO | = | nitric oxide |
| PROXYL | = | 2, 2, 5, 5-tetramethyl-pyrrolidine-1-oxyl |
| ROS | = | reactive oxygen species |
| TEMPO | = | 2, 2, 6, 6-tetramethyl-piperidine-1-oxyl |
| TNBS | = | trinitrobenzene sulphonic acid |
| UC | = | ulcerative colitis |