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Related Experiment Videos

The local lymph node assay in practice: a current regulatory perspective.

A Cockshott1, P Evans, C A Ryan

  • 1Health and Safety Executive, Bootle, UK. amanda.cockshott@hse.gsi.gov.uk

Human & Experimental Toxicology
|August 11, 2006
PubMed
Summary
This summary is machine-generated.

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The local lymph node assay (LLNA) is a reliable method for assessing skin sensitization potential in new industrial chemicals. Regulatory bodies like the UK Health and Safety Executive found the LLNA satisfactory for routine use, confirming its effectiveness.

Area of Science:

  • Toxicology
  • Dermatology
  • Regulatory Science

Background:

  • The Organization for Economic Cooperation and Development (OECD) formally accepted the local lymph node assay (LLNA) as a guideline in April 2002.
  • The UK Health and Safety Executive (HSE) designated the LLNA as the preferred method for skin sensitization assessment under the EU notification scheme for new industrial chemicals (NONS).

Purpose of the Study:

  • To summarize the HSE's experience with the LLNA over the two years following its adoption as the method of choice.
  • To assess adherence to OECD guidelines, interpret LLNA results, and evaluate classification outcomes for new industrial chemicals.

Main Methods:

  • Assessment of 48 LLNA study reports submitted for NONS notification purposes.
  • Evaluation of adherence to OECD guideline specifics including animal usage, cell proliferation measurement, vehicles, and positive controls.

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  • Analysis of dose selection factors, including vehicle choice and its impact on test substance concentration and application properties.

    • Main Results:

    • Notifying laboratories generally adhered well to the OECD LLNA guideline.
    • Initial challenges with the individual animal approach due to technical inexperience were overcome with practice.
    • Toxicity and irritation were minor factors in dose selection; vehicle choice was more critical for maximizing concentration and application properties.
    • The proportion of new substances classified as skin sensitizers remained consistent with previous years, despite concerns about LLNA sensitivity compared to the Guinea Pig Maximization Test (GPMT).

    Conclusions:

    • The LLNA is suitable for routine regulatory use in assessing skin sensitization potential.
    • The HSE's experience indicates successful implementation and satisfactory performance of the LLNA for regulatory notification purposes.
    • The LLNA provides reliable skin sensitization data, comparable to historical methods, supporting its role in chemical safety assessment.