title: Identical T cell clones are located within the mouse gut epithelium and lamina propia and circulate in the thoracic duct lymph.
abstract: Murine gut intraepithelial (IEL) T cell receptor (TCR)-alpha/beta lymphocytes bearing CD8alpha/13 or CD8alpha/alpha coreceptors have been shown previously to express different oligoclonal TCR beta chain repertoires in the same mouse, in agreement with other evidence indicating that these two populations belong to different ontogenic lineages, with only CD8alpha/beta+ IELs being fully thymus dependent. CD8alpha/beta+, but not CD8alpha/alpha+, T lymphocytes are also present in the lamina propria. Here, we show that CD8alpha/beta+ lymphocytes from the lamina propria and the epithelium are both oligoclonal, and that they share the same TCR-beta clonotypes in the same mouse, as is also the case for CD4alpha T cells. Furthermore, identical T cell clones were detected among CD8alpha/beta IELs and CD8alpha/beta+ blasts circulating into the thoracic duct (TD) lymph of the same mouse, whereas TD small lymphocytes are polyclonal. These findings must be considered in light of previous observations showing that T blasts, but not small T lymphocytes, circulating in the TD lymph have the capacity of homing into the gut epithelium and lamina propria. These combined observations have interesting implications for our understanding of the recirculation of gut thymus-dependent lymphocytes and their precursors, and of the events leading up to the selection of their restricted TCR repertoire.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale (INSERM), Hôpital Necker-Enfants Malades, Paris, France.
authors.forename: T
authors.initials: T
authors.lastname: Arstila
authors.forename: T P
authors.initials: TP
authors.lastname: Arstila
authors.forename: S
authors.initials: S
authors.lastname: Calbo
authors.forename: F
authors.initials: F
authors.lastname: Selz
authors.forename: M
authors.initials: M
authors.lastname: Malassis-Seris
authors.forename: P
authors.initials: P
authors.lastname: Vassalli
authors.forename: P
authors.initials: P
authors.lastname: Kourilsky
authors.forename: D
authors.initials: D
authors.lastname: Guy-Grand
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002465:Cell Movement; D002678:Chimera; D002999:Clone Cells / Q000276:immunology; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D019674:Genes, T-Cell Receptor beta; D014644:Genetic Variation; D006412:Hematopoietic Stem Cells / Q000276:immunology; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology; D007421:Intestine, Small / Q000166:cytology / Q000276:immunology*; D008196:Lymph / Q000166:cytology / Q000276:immunology*; D051379:Mice; D008809:Mice, Inbred C3H; D008811:Mice, Inbred DBA; D010581:Peyer's Patches / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013897:Thoracic Duct / Q000166:cytology / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology