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Related Experiment Video

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Performance standard-based validation study for local lymph node assay: 5-bromo-2-deoxyuridine-flow cytometry method.

Ilyoung Ahn1, Tae-Sung Kim1, Eun-Sun Jung2

  • 1Korean Center for the Validation of Alternative Methods, National Institute of Food and Drug Safety Evaluation, MFDS, Chungbuk, Republic of Korea.

Regulatory Toxicology and Pharmacology : RTP
|June 19, 2016
PubMed
Summary

The 5-bromo-2-deoxyuridine-flow cytometry method (LLNA: BrdU-FCM) offers a reliable and accurate approach for skin sensitization testing. This refined technique reduces animal use while maintaining high predictive capacity for chemical safety assessments.

Keywords:
Flow cytometryLLNA: BrdU-FCMLocal lymph node assayPerformance standardsSkin sensitizationValidation study

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Area of Science:

  • Toxicology
  • Immunology
  • Analytical Chemistry

Background:

  • The Local Lymph Node Assay (LLNA) is a standard method for assessing chemical skin sensitization.
  • Traditional LLNA methods involve radioisotopes, raising concerns about animal welfare and waste disposal.
  • Advancements in flow cytometry (FCM) offer opportunities to refine existing toxicological assays.

Purpose of the Study:

  • To validate the reliability, accuracy, and transferability of the 5-bromo-2-deoxyuridine-flow cytometry (LLNA: BrdU-FCM) method.
  • To assess the performance of LLNA: BrdU-FCM against OECD Test Guideline (TG) No. 429 performance standards.
  • To evaluate the predictive capacity of the LLNA: BrdU-FCM for skin sensitization potential.

Main Methods:

  • The LLNA: BrdU-FCM, a non-radioisotopic technique, was employed.
  • Four laboratories participated in inter-laboratory validation studies.
  • Standardized protocols and reference chemicals, including hexyl cinnamic aldehyde (HCA) and 2,4-dinitrochlorobenzene, were used.
  • Performance was evaluated based on stimulation index (SI) and EC2.7 values.

Main Results:

  • All participating laboratories successfully demonstrated transferability by consistently achieving stimulation index (SI) values greater than 3 for 25% hexyl cinnamic aldehyde (HCA).
  • Within- and between-laboratory reproducibility were confirmed, with EC2.7 values falling within acceptance ranges for HCA (0.025-0.1%) and 2,4-dinitrochlorobenzene (5-20%).
  • Testing with 18 reference chemicals showed high predictive capacity: 84.6% sensitivity, 100% specificity, and 88.9% accuracy compared to the original LLNA.

Conclusions:

  • The LLNA: BrdU-FCM method meets the performance criteria for OECD TG No. 429.
  • The method is reliable, accurate, and reproducible for skin sensitization testing.
  • LLNA: BrdU-FCM offers a refined, non-radioisotopic alternative with reduced animal use and validated predictive capacity.