title: In vitro modulation of T6 expression on gingival Langerhans cells by interleukin-1 inhibitors and ETAF.
abstract: T6 antigen is a highly specific marker for human Langerhans cells (LC). Previous studies have demonstrated that Interleukin-1 (IL-1) and an IL-1 inhibitor (ILS) modulate LC T6 expression (T6E) in explant culture. The present study examined the in vitro modulation of T6E by two molecules: epidermal-cell-derived thymocyte-activating factor (ETAF), and a bone-derived protein (BP) implicated in the control of bone homeostasis. The effect of purified ILS was also examined. ETAF mimicked the stimulatory effect of IL-1 on LC T6E, while BP depressed T6E in a manner resembling that seen with ILS. No agents altered Class II (DR and DQ) expression by LC. BP was a specific IL-1 inhibitor, and did not inhibit thymocyte proliferation in the standard IL-1 bioassay in the absence of IL-1. These results demonstrate that molecules resembling IL-1 or ILS can modulate T6E, and implicate locally produced ETAF and ILS in the regulation of T6E in the oral mucosa in vivo.
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis*; D001842:Bone and Bones; D002455:Cell Division / Q000187:drug effects; D005881:Gingiva / Q000166:cytology* / Q000276:immunology; D006683:HLA-DQ Antigens / Q000032:analysis; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D007375:Interleukin-1 / Q000276:immunology* / Q000494:pharmacology*; D007801:Langerhans Cells / Q000187:drug effects / Q000276:immunology*; D008222:Lymphokines / Q000494:pharmacology*; D011506:Proteins / Q000494:pharmacology*; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens; D007375:Interleukin-1; D008222:Lymphokines; D011506:Proteins