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In vitro methods: their relevance and complementarity in ocular safety assessment
A Rougier1, M Cottin, O de Silva
1L'OREAL, Basic Research Center, Aulnay Sous Bois, France.
Lens and Eye Toxicity Research
|January 1, 1992
Summary
In vitro methods effectively assess ocular irritation from surfactants, lotions, and shampoos. The Het-Chorioallantoic Membrane (Het-CAM) test and cell culture assays show high correlation with in vivo data for predicting eye safety.
Area of Science:
- Ophthalmology
- Toxicology
- In Vitro Toxicology
Background:
- Ocular irritation involves complex mechanisms affecting corneal and conjunctival cells, including cytotoxicity, impaired function, and inflammation.
- Corneal opacity and impaired recovery can result from structural protein changes or hydration alterations, linked to endothelial cell activity.
- In vitro methods offer potential for evaluating these ocular effects without animal testing.
Purpose of the Study:
- To evaluate the efficacy of various in vitro methods in predicting ocular irritancy of surfactants, lotions, and shampoos.
- To compare in vitro findings with existing in vivo ocular irritancy data for a range of consumer products.
- To identify the most reliable in vitro assays for assessing acute ocular irritancy and recovery potential.
Main Methods:
- Forty-one surfactants, lotions, and shampoos were tested using 6 to 8 distinct in vitro assays.
- Each assay focused on specific endpoints related to ocular irritation mechanisms, such as cytotoxicity, vascular effects, opacity, and permeability.
- Results from in vitro tests were statistically correlated with established in vivo ocular irritancy data using Spearman's rho coefficients.
Main Results:
- The Het-Chorioallantoic Membrane (Het-CAM) test, particularly its vascular endpoint, demonstrated the highest correlation (Spearman's rho > 0.90) with in vivo acute ocular irritancy.
- Cell culture methods evaluating early toxic effects after short exposure times also showed strong correlation (Spearman's rho > 0.85).
- The isolated cornea opacity and permeability test provided valuable complementary data regarding recovery from surfactant-induced damage.
Conclusions:
- In vitro assays, especially Het-CAM and specific cell culture methods, are highly effective for predicting acute ocular irritancy of the studied product categories.
- These in vitro approaches offer a promising alternative for ocular safety assessment, reducing the need for in vivo testing.
- Further development and application of these methods can enhance the safety evaluation of consumer products impacting ocular tissues.