title: Two phenotypically distinct T cells are involved in ultraviolet-irradiated urocanic acid-induced suppression of the efferent delayed-type hypersensitivity response to herpes simplex virus, type 1 in vivo.
abstract: When UVB-irradiated urocanic acid, the putative photoreceptor/mediator for UVB suppression, is administered to mice it induces a dose-dependent suppression of the delayed-type hypersensitivity response to herpes simplex virus, type 1 (HSV-1), of similar magnitude to that induced by UV irradiation of mice. In this study, the efferent suppression of delayed-type hypersensitivity by UV-irradiated urocanic acid is demonstrated to be due to 2 phenotypically distinct T cells, (Thy1+, L3T4-, Ly2+) and (Thy1+, L3T4+, Ly2-). The suppression is specific for HSV-1. This situation parallels the generation of 2 distinct T-suppressor cells for HSV-1 by UV irradiation of mice and provides further evidence for the involvement of urocanic acid in the generation of UVB suppression.
mesh_terms: D000818:Animals; D005260:Female; D006968:Hypersensitivity, Delayed / Q000276:immunology / Q000517:prevention & control* / Q000532:radiotherapy; D007093:Imidazoles / Q000627:therapeutic use*; D007108:Immune Tolerance / Q000187:drug effects; D008297:Male; D051379:Mice; D010641:Phenotype; D018139:Simplexvirus / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000637:transplantation; D013601:T-Lymphocytes / Q000502:physiology*; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects / Q000276:immunology; D014466:Ultraviolet Rays; D014560:Urocanic Acid / Q000528:radiation effects / Q000627:therapeutic use*
chemical_list: D007093:Imidazoles; D014560:Urocanic Acid