title: Differentiation of responses to allergenic and irritant compounds in mouse popliteal lymph node assay.
abstract: The mouse popliteal lymph node assay (PLNA) has been proposed as an immunotoxicological test to predict allergenic chemicals. However, PLN response is also observed in association with non-specific activation induced by some irritants. We, therefore, examined the kinetics of the PLN cellularity indices of primary and secondary responses. Flow cytometric analysis was used to measure the proportions of T and B cells in PLN. Male ICR mice were subcutaneously injected with TNBS (an allergenic compound) or SDS (an irritant compound) in the left hind footpad, and with vehicle in the right one. On day 28 after first injection, mice were injected with 1/10 or 1/100 dose of the initial injection. On day 7 after first injection of TNBS, primary response reached maximal PLN cellularity index (16.5). On day 2 after second injection, secondary response reached maximal PLN cellularity index (13.1). A marked increase in proportion of B cells was observed in the PLN. On the other hand, after first injection of SDS, primary response reached maximal PLN cellularity index (2.8) on day 10, but neither secondary response nor increase in the B cell proportion were observed. These results suggest that the detection of secondary response and the flow cytometric analysis are useful in differentiating responses to allergenic and irritant compounds in the PLNA.
authors.affiliation: Toxicology Laboratory, Taisho Pharmaceutical Co., Ltd., Saitama, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Suda
authors.forename: Y
authors.initials: Y
authors.lastname: Iwaki
authors.forename: M
authors.initials: M
authors.lastname: Kimura
mesh_terms: D000485:Allergens / Q000633:toxicity*; D000818:Animals; D016175:B-Lymphocyte Subsets / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D005434:Flow Cytometry; D007117:Immunization, Secondary; D007509:Irritants / Q000633:toxicity*; D007700:Kinetics; D008198:Lymph Nodes / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D018655:Lymphocyte Count; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D012967:Sodium Dodecyl Sulfate / Q000633:toxicity*; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D018675:Toxicity Tests; D014302:Trinitrobenzenesulfonic Acid / Q000633:toxicity*
chemical_list: D000485:Allergens; D007509:Irritants; D012967:Sodium Dodecyl Sulfate; D014302:Trinitrobenzenesulfonic Acid