title: An adult thymic stromal-cell suspension model for in vitro positive selection.
abstract: Presented here is a cell-suspension model for positive selection using thymocytes from alphabeta-TCR (H-2Db-restricted) transgenic mice specific to the lymphocytic choriomeningitis virus (LCMV) on a nonselecting MHC background (H-2d or TAP-1 -/-), cocultured with freshly isolated adult thymus stromal cells of the selecting MHC type. The thymic stromal cells alone induced positive selection of functional CD4- CD8+ cells whose kinetics and efficiency were enhanced by nominal peptide. Fibroblasts expressing the selecting MHC alone did not induce positive selection; however, together with nonselecting stroma and nominal peptide, there was inefficient positive. These results suggest multiple signaling in positive selection with selection events able to occur on multiple-cell types. The ease with which this model can be manipulated should greatly facilitate the resolution of the mechanisms of positive selection in normal and pathological states.
authors.affiliation: Department of Pathology and Immunology, Monash Medical School, Prahran, Australia.
authors.forename: A P
authors.initials: AP
authors.lastname: Chidgey
authors.forename: H
authors.initials: H
authors.lastname: Pircher
authors.forename: H R
authors.initials: HR
authors.lastname: MacDonald
authors.forename: R L
authors.initials: RL
authors.lastname: Boyd
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D002454:Cell Differentiation; D002478:Cells, Cultured; D018920:Coculture Techniques; D006183:H-2 Antigens / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000502:physiology; D037181:Lectins, C-Type; D008213:Lymphocyte Activation; D008217:Lymphocytic choriomeningitis virus / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D018448:Models, Immunological; D010455:Peptides / Q000276:immunology; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology / Q000378:metabolism; D015398:Signal Transduction; D017154:Stromal Cells / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology*; D013950:Thymus Gland / Q000166:cytology* / Q000254:growth & development / Q000276:immunology; D000099192:CD69 Antigens
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D006183:H-2 Antigens; D037181:Lectins, C-Type; D010455:Peptides; D016693:Receptors, Antigen, T-Cell, alpha-beta; D000099192:CD69 Antigens