N-Dansyl-S-nitrosohomocysteine a fluorescent probe for intracellular thiols and S-nitrosothiols
| Autor: | Bulent Mutus, Niroshan Ramachandran, Barbara S. Zielinski, Sanjay Jacob, Laura Mazzanti, Giovanna Curatola |
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| Rok vydání: | 1999 |
| Předmět: |
Biophysics
Photochemistry Biochemistry High-performance liquid chromatography Cell Line chemistry.chemical_compound Cricetulus Structural Biology Cricetinae Dinitrochlorobenzene polycyclic compounds Fluorescence microscope Extracellular Animals Sulfhydryl Compounds Biology Homocysteine Molecular Biology Fluorescent Dyes S-Nitrosothiols Dansyl Compounds Chemistry Photodissociation Life Sciences Glutathione Fluorescence Microscopy Fluorescence S-Nitrosoglutathione Intracellular Nitroso Compounds |
| Zdroj: | Biological Sciences Publications |
| ISSN: | 0167-4838 |
| DOI: | 10.1016/s0167-4838(98)00286-6 |
| Popis: | The fluorescence emission spectrum of N-dansyl-S-nitrosohomocysteine was enhanced approximately 8-fold upon removal of the NO group either by photolysis or by transnitrosation with free thiols like glutathione. The fluorescence enhancement was reversible in that it could be quenched in the presence of excess S-nitrosoglutathione. Attempts were then made to utilize N-dansyl-S-nitrosohomocysteine as an intracellular probe of thiols/S-nitrosothiols. Fluorescence microscopy of fibroblasts in culture indicated that intracellular N-dansyl-S-nitrosohomocysteine levels reached a maximum within 5 min. N-Dansyl-S-nitrosohomocysteine fluorescence was directly proportional to intracellular GSH levels, directly determined with HPLC. N-Dansyl-S-nitrosohomocysteine preloaded cells were also sensitive to S-nitrosoglutathione uptake as the intracellular fluorescence decreased as a function of time upon exposure to extracellular S-nitrosoglutathione. |
| Databáze: | OpenAIRE |
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