title: A defect in lineage fate decision during fetal thymic invariant NKT cell development may regulate susceptibility to type 1 diabetes.
abstract: A numerical and functional deficiency in invariant NKT (iNKT) cells detectable by 3 wk of age in the thymus and spleen mediates the pathogenesis of type 1 diabetes in NOD mice, but the stage of T cell development at which this deficiency first occurs is unknown. We report in this study that this deficiency develops after the CD4(+)CD8(+) double-positive stage of thymic T cell development and is due to a lineage-specific depletion of CD4(-)CD8(-) double-negative alphabeta T cells and iNKT cells from the thymus between embryonic day 18 and day 1 after birth. Thus, an inheritable defect in a lineage fate decision that elicits a deficiency in fetal thymic iNKT cell development may predispose to susceptibility to type 1 diabetes.
authors.affiliation: Autoimmunity/Diabetes, Robarts Research Institute, University of Western Ontario, London, Canada.
authors.forename: Melany J D
authors.initials: MJ
authors.lastname: Wagner
authors.forename: Shabbir
authors.initials: S
authors.lastname: Hussain
authors.forename: Mala
authors.initials: M
authors.lastname: Mehan
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Verdi
authors.forename: Terry L
authors.initials: TL
authors.lastname: Delovitch
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D019070:Cell Lineage / Q000235:genetics / Q000276:immunology; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics / Q000276:immunology*; D005260:Female; D005333:Fetus / Q000276:immunology* / Q000473:pathology; D020022:Genetic Predisposition to Disease; D047908:Intracellular Signaling Peptides and Proteins; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D008231:Lymphopenia / Q000235:genetics / Q000276:immunology; D008565:Membrane Proteins / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D009924:Organ Culture Techniques; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000172:deficiency / Q000235:genetics; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D013950:Thymus Gland / Q000276:immunology* / Q000378:metabolism / Q000473:pathology
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; C064045:delta protein