title: Selection of intestinal intraepithelial lymphocyte T cell receptors: evidence for a dynamic tissue-specific process.
abstract: An extensive comparison of TCR alpha beta V-region usage by CD8 beta-CD4+CD8+ intraepithelial lymphocytes (IEL), CD4-CD8+ IEL, and lymph node (LN) T cell subsets in three minor lymphocyte stimulating (Mls)-disparate, MHC-identical mouse strains revealed novel TCR selection patterns. In cases where forbidden V regions were expressed by CD8 beta- CD4-CD8+ IEL, the same TCRs were deleted from CD8 beta- CD4+CD8+ IEL, indicating that lack of CD8 beta expression was not solely responsible for forbidden V-region expression. These results also suggested that CD4 may be involved in negative selection of CD4+CD8+ IEL TCRs. In C57BR/cdJ (Mls-1b2b) mice, a major increase in V beta 3+CD4+CD8+ IEL but not in other IEL or LN subsets was noted suggesting a subset-specific expansion of V beta 3+ cells. Negative selection of V beta 14+ cells in only the CD4+CD8+ IEL subset further supported the existence of intestine-specific TCR selection processes. Analysis of V-region expression of CD8 beta + and CD8 beta-CD4-CD8+ IEL subsets revealed that forbidden V-region expression was not strictly confined to the CD8 beta- subset in all cases. Overall, the data point to a dynamic, gut-specific TCR selection process that may be antigen driven.
authors.affiliation: Department of Cell Biology, Upjohn Company, Kalamazoo, MI 49001.
authors.forename: G
authors.initials: G
authors.lastname: Badiner
authors.forename: T G
authors.initials: TG
authors.lastname: Goodman
authors.forename: L
authors.initials: L
authors.lastname: Lefrançois
mesh_terms: D000818:Animals; D004847:Epithelial Cells; D004848:Epithelium / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D016130:Immunophenotyping; D007422:Intestines / Q000276:immunology*; D008198:Lymph Nodes / Q000166:cytology; D051379:Mice; D008806:Mice, Inbred AKR / Q000276:immunology; D008809:Mice, Inbred C3H / Q000276:immunology; D008810:Mice, Inbred C57BL / Q000276:immunology; D016747:Minor Lymphocyte Stimulatory Antigens / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics*; D012641:Selection, Genetic; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D016747:Minor Lymphocyte Stimulatory Antigens; D016693:Receptors, Antigen, T-Cell, alpha-beta