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Skin sensitization to linalyl hydroperoxide: support for radical intermediates
M Bezard1, A T Karlberg, J Montelius
1Laboratoire de Dermatochimie associé au CNRS, Université Louis Pasteur, Clinique Dermatologique, CHU, Strasbourg, France.
Chemical Research in Toxicology
|September 26, 1997
Summary
Linalyl hydroperoxide and its epoxide derivative are skin sensitizers. These findings clarify the mechanism of allylic hydroperoxide skin sensitization, involving reactive carbon-centered radicals.
Area of Science:
- Chemical Toxicology
- Dermatology
- Organic Chemistry
Background:
- Allylic hydroperoxides can cause skin sensitization.
- Understanding their mechanism is crucial for safety assessments.
Purpose of the Study:
- To elucidate the skin sensitization mechanism of allylic hydroperoxides.
- To synthesize and evaluate linalyl hydroperoxide and its rearrangement products for sensitizing properties.
Main Methods:
- Synthesis of linalyl hydroperoxide and related compounds.
- Skin sensitization screening using the local lymph node assay (LLNA) in mice.
- Further evaluation in guinea pigs using the Freund's complete adjuvant test (FCAT).
- Radical-trapping experiments to identify reaction intermediates.
Main Results:
- Linalyl hydroperoxide (1) and linalyl epoxide (2) identified as sensitizers.
- Other synthesized compounds showed mild or no sensitization.
- No cross-reactivity observed between sensitizers 1 and 2 in guinea pigs.
- Radical-trapping experiments suggest a carbon-centered radical intermediate in sensitization.
Conclusions:
- Linalyl hydroperoxide and its epoxide are key skin sensitizers.
- The sensitization mechanism likely involves reactive carbon-centered radicals.
- Findings contribute to understanding allylic hydroperoxide toxicology.