title: T cell Ig and mucin 1 (TIM-1) is expressed on in vivo-activated T cells and provides a costimulatory signal for T cell activation.
abstract: Polymorphisms in TIM-1, a member of the T cell Ig and mucin (TIM) domain family, are associated with relative susceptibility to the development of T helper 2-dominated immune responses such as in allergic asthma. Recent data have also suggested that ligation of TIM-1 can augment T cell activation. We have found that the TIM-1 protein is expressed on CD4(+) T cells in vivo after intranasal immunization. Ectopic expression of TIM-1 during T cell differentiation results in a significant increase in the number of cells producing IL-4 but not IFN-gamma. Furthermore, TIM-1 expression provides a costimulatory signal that increases transcription from the IL-4 promoter and from isolated nuclear factor of activated T cells/activating protein-1 (NFAT/AP-1) elements. Finally, we provide evidence that TIM-1 can be phosphorylated on tyrosine and that TIM-1 costimulation requires its cytoplasmic tail and the conserved tyrosine within that domain. These results constitute evidence that TIM-1 directly couples to phosphotyrosine-dependent intracellular signaling pathways.
authors.affiliation: Department of Immunology and Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
authors.forename: Anjali J
authors.initials: AJ
authors.lastname: de Souza
authors.forename: Timothy B
authors.initials: TB
authors.lastname: Oriss
authors.forename: Katherine J
authors.initials: KJ
authors.lastname: O'malley
authors.forename: Anuradha
authors.initials: A
authors.lastname: Ray
authors.forename: Lawrence P
authors.initials: LP
authors.lastname: Kane
mesh_terms: D000281:Administration, Intranasal; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D002454:Cell Differentiation / Q000235:genetics; D002772:Cholera Toxin / Q000008:administration & dosage / Q000276:immunology; D005786:Gene Expression Regulation / Q000276:immunology; D000072596:Hepatitis A Virus Cellular Receptor 1; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D019169:Jurkat Cells; D008213:Lymphocyte Activation / Q000502:physiology*; D008565:Membrane Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000008:administration & dosage / Q000276:immunology; D010766:Phosphorylation; D019000:Phosphotyrosine / Q000378:metabolism; D017434:Protein Structure, Tertiary; D015398:Signal Transduction / Q000235:genetics / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000378:metabolism; D014158:Transcription, Genetic / Q000276:immunology
chemical_list: C442240:Havcr1 protein, mouse; D000072596:Hepatitis A Virus Cellular Receptor 1; D008565:Membrane Proteins; D015847:Interleukin-4; D019000:Phosphotyrosine; D007371:Interferon-gamma; D010047:Ovalbumin; D002772:Cholera Toxin