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Cytotoxicity of spin trapping compounds
R F Haseloff1, K Mertsch, E Rohde
1Research Institute of Molecular Pharmacology, Berlin, Germany. haseloff@fmp-berlin.de
FEBS Letters
|December 31, 1997
Summary
Spin trapping compounds are crucial for detecting cell-released free radicals. Researchers evaluated spin trap cytotoxicity, finding nitrones generally safer than nitroso compounds for cell culture applications.
Area of Science:
- Cell Biology
- Biochemistry
- Toxicology
Background:
- Spin trapping compounds are widely used to detect free radicals generated by cellular processes.
- Assessing the cytotoxicity of these spin traps is essential to avoid interference with normal cell behavior and viability.
- Understanding the toxicological profiles of different spin traps is critical for their appropriate application in biological research.
Purpose of the Study:
- To evaluate the cytotoxicity of eleven spin trapping compounds, including eight nitrones and three nitroso traps, on bovine aortic endothelial cells.
- To compare the toxic effects of different classes of spin traps and identify compounds with lower cytotoxicity.
- To determine the influence of chemical structure and lipophilicity on the cytotoxic potential of nitronyl nitroxides.
Main Methods:
- Cytotoxicity was assessed by determining the concentration of spin traps that resulted in a 50% survival rate (toxicity range) in bovine aortic endothelial cells.
- A panel of eight nitrone spin traps and three nitroso spin traps were tested.
- Three nitronyl nitroxides with varying substitution patterns were also evaluated for their cytotoxic effects.
Main Results:
- 5,5-dimethylpyrroline-1-oxide and 2,2,4-trimethyl-2H-imidazole-1-oxide exhibited the lowest cytotoxicity among the tested spin traps.
- Nitrosobenzene and 2-methyl-2-nitrosopropane demonstrated the strongest cytotoxic effects.
- Cytotoxicity of nitronyl nitroxides was dependent on their substitution, with lipophilic derivatives being significantly more toxic than hydrophilic ones.
Conclusions:
- Most spin traps can be safely employed in cell cultures at typical millimolar concentrations.
- Caution is advised when using nitroso spin traps due to their pronounced cytotoxic effects.
- The selection of appropriate spin traps, considering their inherent cytotoxicity, is crucial for reliable free radical detection in cellular systems.