Abstract
A predictive test using mice for the identification of contact sensitizing chemicals was developed. Contact sensitizing activity is measured as a function of draining lymph node activation following application of test chemical. Experimental conditions for assessment of induced lymph node cell (LNC) responses have been optimized. BALB/c mice were initially treated with intradermal injections of test chemical in Freund's complete adjuvant emulsion. Five days after intradermal injection, mice were exposed topically to chemical in vehicle on the ears daily for 3 consecutive days. Next day following the final exposure, changes in lymph node weight, total cell number in the draining lymph nodes and LNC proliferation for 24 h culture were assessed. The performance of the method was evaluated with ten sensitizing chemicals and a non-sensitizing irritant, sodium lauryl sulfate (SLS). The LNC proliferation induced by combination of intradermal injection and topical application of sensitizing chemicals was more clearly increased than that following only topical application. With the single exception of sulfanilic acid, the method developed was able to detect the sensitizing capacity of chemicals that failed to induce sensitization in the local lymph node assay. Under the conditions used, SLS did not induce measurable lymph node responses. These results suggest that the mouse lymph node assay can provide a sensitive screening test for weak to moderate sensitizers. In addition, the assay offers the advantages of objective and quantitative endpoints, and is suitable for the evaluation of colored or irritant chemicals.
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Abbreviations
- GPMT:
-
guinea pig maximization test
- LLNA:
-
local lymph node assay
- LNC:
-
lymph node cell
- FCA:
-
Freund's complete adjuvant
- TP:
-
Tinuvin P, 2-(2′-hydroxy-5′-methylphenyl)benzotriazole
- SA:
-
sulfanilic acid, 4-aminobenzenesulfonic acid
- CA:
-
p-chloroaniline
- DNCB:
-
2,4-dinitrochlorobenzene
- Benzocaine:
-
ethyl 4-aminobenzoate
- HBA:
-
4-hydroxybenzoic acid
- NiSO4 :
-
nickel sulfate
- SLS:
-
sodium lauryl sulfate
- DPTU:
-
N,N′-diphenylthiourea
- MBT:
-
2-mercaptobenzothiazole
- ZDEC:
-
zinc diethyldithiocarbamate
- DMSO:
-
dimethylsulfoxide
- AOO:
-
acetone: olive oil (4∶1)
- SIp :
-
stimulation index of lymph node cell proliferation
- SIn :
-
stimulation index of lymph node cell number
- SItotal :
-
stimulation index of total lymph node responses
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- 3HTdR:
-
[methyl-3H]thymidine
- MEST:
-
mouse ear swelling test
- PLNA:
-
popliteal lymph node assay
- SD:
-
standard deviation
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Ikarashi, Y., Tsuchiya, T. & Nakamura, A. A sensitive mouse lymph node assay with two application phases for detection of contact allergens. Arch Toxicol 67, 629–636 (1993). https://doi.org/10.1007/BF01974070
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DOI: https://doi.org/10.1007/BF01974070