Abstract
In vivo spin trapping is potentially a very useful tool to investigate the role of free radicals in physiologic processes and disease development. Unfortunately, knowledge on the stability and distribution of spin traps in living systems is limited. Therefore, in our study, we selected 11 acyclic and cyclic nitrone spin traps with diverse properties to determine their pharmacokinetics in mice. At varying times after intraperitoneal administration, we measured the concentration of the spin traps in the liver, heart, and blood. Our results showed that most spin traps were rapidly absorbed and were approximately evenly distributed throughout the mouse body. It was also found that most of the traps were relatively stable in vivo with more than half of the injected amount still available for spin trapping free radicals after an hour. Two of the 11 tested spin traps, however, decomposed after injection. These results indicate that for a successful in vivo spin trapping experiment, the stability of the spin trap is not of major concern, but the time course of distribution may be important.
| Original language | English |
|---|---|
| Pages (from-to) | 82-89 |
| Number of pages | 8 |
| Journal | Free Radical Biology and Medicine |
| Volume | 27 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Jul 1999 |
Funding
We are grateful to Dr. Edward G. Janzen for allowing us to use spin traps that were synthesized by his group at the University of Georgia, the University of Guelph, and the Oklahoma Medical Research Foundation. This research is supported in part by a grant from National Institutes of Health (R21 HL60623) and the Animal Gift Program of Charles River Laboratory. This research also used the facilities of the EPR Center for the Study of Viable Systems at Dartmouth that is supported by the National Institutes of Health Grant P41 RR11602. The authors thank Dr. G. M. Rosen for many helpful discussion and comments of the manuscript.
| Funder number |
|---|
| P41 RR11602 |
| R21 HL60623 |
| P41RR011602 |
Keywords
- Electron paramagnetic resonance
- Free radicals
- High-performance liquid chromatography
- Pharmacokinetics
- Spin trapping
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