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Related Experiment Videos

Local lymph node assay: differentiating allergic and irritant responses using flow cytometry.

G F Gerberick1, L W Cruse, C A Ryan

  • 1Miami Valley Laboratories, The Procter and Gamble Company, Cincinnati, Ohio 45239-8707, USA. gerberick.gf@pg.com

Methods (San Diego, Calif.)
|October 20, 1999
PubMed
Summary

The murine local lymph node assay (LLNA) can distinguish between allergic and irritant responses using flow cytometry. This method analyzes T-cell activation and memory markers in draining lymph nodes for improved chemical safety assessment.

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Area of Science:

  • Immunotoxicology
  • Dermatology
  • Chemical Safety Assessment

Background:

  • The murine local lymph node assay (LLNA) assesses chemical contact sensitization potential by measuring lymphocyte proliferation in draining lymph nodes (DLNs).
  • The LLNA is a reliable alternative to guinea pig tests for identifying skin sensitizers.
  • Distinguishing allergic from irritant-induced proliferation in the LLNA remains a challenge.

Purpose of the Study:

  • To differentiate between allergen- and irritant-induced lymphocyte proliferation in the murine local lymph node assay (LLNA).
  • To utilize flow cytometry to analyze lymphocyte subsets and T-cell activation/memory markers in DLNs.
  • To enhance the predictive accuracy of the LLNA for chemical sensitization potential.

Main Methods:

  • Mice were topically treated with allergens or irritants for three consecutive days.

Related Experiment Videos

  • Draining lymph nodes (DLNs) were harvested 72 hours post-treatment.
  • Flow cytometry analyzed T-cell (CD4+, CD8+) and B-cell (B220+) percentages, along with CD62L and CD44 expression to identify T-cell activation/memory phenotypes.

    • Main Results:

    • Both allergen and irritant treatments increased DLN cellularity compared to controls.
    • Allergen treatment led to a preferential increase in B220+ B cells.
    • Allergens selectively increased CD4+ and CD8+ T cells with a CD62L(lo)CD44(hi) activation/memory phenotype, unlike irritants.

    Conclusions:

    • Flow cytometry analysis of cell phenotype and T-cell activation/memory markers can distinguish allergen- from irritant-induced proliferation in the LLNA.
    • This approach improves the specificity of the LLNA for identifying chemical sensitizers.
    • The findings support the use of immunophenotyping to refine chemical safety assessments.