title: Expansion of natural (NK1+) T cells that express alpha beta T cell receptors in transporters associated with antigen presentation-1 null and thymus leukemia antigen positive mice.
abstract: Thymic selection of natural killer-1+ natural T cells that express alpha beta T cell receptors requires a conserved beta 2-microglobulin-associated molecule, presumably CD1d, displayed by CD4+8+ thymocytes. Here we demonstrate that positive selection of natural T cells occurs independent of transporters associated with antigen presentation-1 (TAP-1) function. Moreover, natural T cells in TAP-1o/o mice are numerically expanded. Several H-2 class Ib molecules function in a TAP-independent manner, suggesting that if expressed in TAP-1o/o thymocytes, they could play a role in natural T cell development. Of these class Ib molecules, H-2TL is expressed by TAP-1o/o thymocytes. Moreover, we find that thymi of TL+ mice congenic or transgenic for H-2T18 also have a numerically expanded natural T cell repertoire compared with TL- mice. This expansion, as in TAP-1o/o thymi, is evident in each of the limited T cell receptor V beta chains expressed by natural T cells, suggesting that TL and CD1d impact similar repertoires. Thus TL, in addition to CD1d, plays a role in natural T cell development.
authors.affiliation: Department of Microbiology & Immunology, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, Hershey 17033, USA.
authors.forename: S
authors.initials: S
authors.lastname: Joyce
authors.forename: I
authors.initials: I
authors.lastname: Negishi
authors.forename: A
authors.initials: A
authors.lastname: Boesteanu
authors.forename: A D
authors.initials: AD
authors.lastname: DeSilva
authors.forename: P
authors.initials: P
authors.lastname: Sharma
authors.forename: M J
authors.initials: MJ
authors.lastname: Chorney
authors.forename: D Y
authors.initials: DY
authors.lastname: Loh
authors.forename: L
authors.initials: L
authors.lastname: Van Kaer
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D000818:Animals; D018949:Antigens, CD1; D015415:Biomarkers; D005434:Flow Cytometry; D006183:H-2 Antigens; D007694:Killer Cells, Natural / Q000276:immunology*; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D016693:Receptors, Antigen, T-Cell, alpha-beta; D001613:beta 2-Microglobulin
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D018949:Antigens, CD1; D015415:Biomarkers; D006183:H-2 Antigens; D008562:Membrane Glycoproteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; D001613:beta 2-Microglobulin; C028388:thymus-leukemia antigens