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Early changes in murine epidermal cell phenotype by contact sensitizers
K D Coutant1, P Ulrich, H Thomas
1Novartis Pharma, Preclinical Safety, Toxicology/Pathology, Basel, Switzerland. karine.coutant@pharma.novartis.com
Summary
This study shows that contact sensitizers alter cell surface molecules in mouse skin cells. These changes may help develop new in vitro tests to identify allergens and reduce animal testing.
Area of Science:
- Immunology
- Dermatology
- Toxicology
Background:
- Contact sensitization is an immune response to certain chemicals.
- Current methods for identifying contact sensitizers often rely on animal testing.
- Understanding early cellular changes is crucial for developing predictive assays.
Purpose of the Study:
- To investigate the modulation of cell-surface molecules in murine epidermal cells (EC) upon in vitro exposure to contact sensitizers.
- To identify potential biomarkers for early detection of contact sensitization.
- To explore the development of an in vitro assay for screening contact sensitizers.
Main Methods:
- Murine epidermal cells (Balb/c EC) were treated in vitro with known contact sensitizers (TNBS, citral, citronellal) and an irritant (sodium dodecyl sulfate).
- Expression levels of cell-surface molecules including CD45, CD40, CD32/16 (Fc gamma RII/III), CD23 (Fc epsilon RII), I-Ad/I-Ed, and CD90.2 were analyzed.
- Changes in molecule expression were compared between strong, mild, and weak sensitizers, and irritants.
Main Results:
- Strong sensitizer TNBS rapidly upregulated CD45, CD40, CD32/16, and CD23 on Langerhans cells (LCs) and CD45, CD40 on dendritic epidermal T cells.
- CD40 was also induced on keratinocytes (CD45 negative population) after TNBS treatment.
- Mild/weak sensitizers (citral, citronellal) upregulated CD32/16 and CD23 on LCs but not CD45 or CD40, while the irritant SDS had no effect.
- I-Ad/I-Ed and CD90.2 expression remained unchanged across treatments.
Conclusions:
- In vitro exposure to chemicals with allergic potential induces specific, early cell-surface phenotype changes.
- These early changes may represent an activated cellular state involved in initiating the afferent phase of contact sensitivity.
- These findings support the development of an in vitro assay for rapid screening of contact sensitizers and differentiating them from irritants, potentially reducing animal use.