Why iron–dithiocarbamates ensure detection of nitric oxide in cells and tissues
| Autor: | Anatoly F. Vanin, Lioudmila N. Kubrina, Vasak D. Mikoyan, Alexander P. Poltorakov, Ernst E. van Faassen |
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| Rok vydání: | 2006 |
| Předmět: |
Male
inorganic chemicals Cancer Research Physiology Radical Clinical Biochemistry Inorganic chemistry Ascorbic Acid Nitric Oxide Biochemistry law.invention Ferrous Nitric oxide Mice Paramagnetism chemistry.chemical_compound Thiocarbamates law medicine Animals Cysteine Ferrous Compounds Dithiocarbamate Electron paramagnetic resonance chemistry.chemical_classification Electron Spin Resonance Spectroscopy Glutathione chemistry Ferric Spin Labels medicine.drug |
| Zdroj: | Nitric Oxide. 15:295-311 |
| ISSN: | 1089-8603 |
| DOI: | 10.1016/j.niox.2005.11.007 |
| Popis: | The in vivo mechanism of NO trapping by iron–dithiocarbamate complexes is considered. Contrary to common belief, we find that in biological systems the NO radicals are predominantly trapped by ferric iron–dithiocarbamates. Therefore, the trapping leads to ferric mononitrosyl complexes which are diamagnetic and cannot be directly detected with Electron Paramagnetic Resonance spectroscopy. The ferric mononitrosyl complexes are far easily reduced to ferrous state with l -cysteine, glutathione, ascorbate or dithiocarbamate ligands than their non-nitrosyl counterpart. When trapping NO in oxygenated biological systems, the majority of trapped nitric oxide is found in diamagnetic ferric mononitrosyl iron complexes. Only a minority fraction of NO is trapped in the form of paramagnetic ferrous mononitrosyl iron complexes with dithiocarbamate ligands. Subsequent ex vivo reduction of biological samples sharply increases the total yield of the paramagnetic mononitrosyl iron complexes. Reduction also eliminates the overlapping EPR spectrum from Cu 2+ –dithiocarbamate complexes. This facilitates the quantification of yields from NO trapping. |
| Databáze: | OpenAIRE |
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