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A convenient fluorometric test method for skin sensitization using glutathione in chemico
Geon Ho Kim1, Dong Ho Cha1, Mahesh R Nepal1
1College of Pharmacy, Yeungnam University, Gyeongsan, South Korea.
Summary
A new fluorometric method identifies skin sensitizers using glutathione (GSH) reactivity. This high-throughput test accurately screens chemicals for sensitization potential.
Area of Science:
- Toxicology
- Analytical Chemistry
Background:
- Skin sensitization is a significant health concern.
- Accurate identification of skin sensitizers is crucial for safety assessment.
- Existing methods can be time-consuming or require complex procedures.
Purpose of the Study:
- To develop a convenient and high-throughput fluorometric assay for identifying skin sensitizers.
- To utilize the reactivity of glutathione (GSH) with potential sensitizers for detection.
- To optimize experimental conditions for reliable and accurate results.
Main Methods:
- Incubation of test chemicals with glutathione (GSH).
- Quantification of remaining GSH using monobromobimane (mBBr), a thiol-detecting agent.
- Optimization of reaction conditions including vehicle, molar ratios, and incubation time.
- Validation using 48 known skin sensitizers and non-sensitizers.
Main Results:
- The optimized method achieved 88.2% sensitivity, 78.6% specificity, and 85.4% accuracy.
- High consistency (95.8%) was observed across three trials.
- A cutoff value of 10.3% GSH depletion effectively classified chemicals.
Conclusions:
- The developed fluorometric assay is a convenient and effective tool for screening skin sensitization potential.
- The method's reliance on GSH and a high-throughput fluorometric detection system makes it practical for widespread use.
- This assay offers a valuable alternative for preliminary assessment of chemical skin sensitization.
