Related Experiment Videos
A predictive mouse ear-swelling model for investigating topical phototoxicity
1Procter & Gamble Co., Miami Valley Laboratories, Cincinnati, OH 45239.
Summary
A mouse ear-swelling model effectively predicts phototoxic potential in consumer products. This quantifiable method assesses both immediate and delayed reactions to UV radiation, offering an objective alternative to subjective evaluations.
Area of Science:
- Toxicology
- Dermatology
- Photobiology
Background:
- Phototoxicity is a significant concern for consumer products applied topically and used outdoors.
- Accurate predictive models are needed to assess the phototoxic potential of such products.
Purpose of the Study:
- To evaluate a mouse ear-swelling model for its ability to predict phototoxic potential.
- To characterize the phototoxic responses elicited by known phototoxins and test materials.
Main Methods:
- Utilized a mouse ear-swelling model with a xenon arc solar simulator delivering ultraviolet (UV) radiation (290-400 nm or 320-400 nm).
- Tested nine known phototoxins and three negative control materials.
- Assessed immediate (20-30 min) and delayed (48-96 hr) phototoxic responses.
- Investigated optimal irradiation timing and dose-dependency for specific compounds.
Main Results:
- The model successfully identified the phototoxic potential of nine known phototoxins.
- Demonstrated both immediate (anthracene) and delayed (8-methoxypsoralen) phototoxic responses.
- Found optimal irradiation for 8-methoxypsoralen occurred 30-60 minutes post-application.
- Phototoxic response to 8-methoxypsoralen was dependent on UVA dose and concentration; 7-methoxycoumarin required both UVB and UVA.
Conclusions:
- The mouse ear-swelling model is a quantifiable and objective tool for phototoxicity testing.
- This model is suitable for investigative and predictive phototoxicity assessments of consumer products.