title: CD43 regulates Th2 differentiation and inflammation.
abstract: CD43 is a highly glycosylated transmembrane protein that regulates T cell activation. CD43(-/-) T cells are hyperproliferative and the cytoplasmic tail of CD43 has been found to be sufficient to reconstitute wild-type proliferation levels, suggesting an intracellular mechanism. In this study, we report that upon TCR ligation CD43(-/-) T cells demonstrated no increase in tyrosine phosphorylation but a decreased calcium flux. Interestingly, CD43(-/-) T cells preferentially differentiated into Th2 cells in vitro, and CD43(-/-) T cells show increased GATA-3 translocation into the nucleus. In vivo, CD43(-/-) mice exhibited increased inflammation in two separate models of Th2-mediated allergic airway disease. In contrast, in Th1-mediated diabetes, nonobese diabetic CD43(-/-) mice did not significantly differ from wild-type mice in disease onset or progression. Th1-induced experimental autoimmune encephalomyelitis to MOG(35-55) was also normal in the CD43(-/-) mice. Nonetheless, the CD43(-/-) mice produced more IL-5 when restimulated with MOG(35-55) in vitro and demonstrated decreased delayed-type hypersensitivity responses. Together, these data demonstrate that although CD43(-/-) T cells preferentially differentiate into Th2 cells, this response is not sufficient to protect against Th1-mediated autoimmune responses.
authors.affiliation: Department of Medicine, Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, IL 60637, USA. jlcanno@uchicago.edu
authors.forename: Judy L
authors.initials: JL
authors.lastname: Cannon
authors.forename: Amélie
authors.initials: A
authors.lastname: Collins
authors.forename: Purvi D
authors.initials: PD
authors.lastname: Mody
authors.forename: Diwaker
authors.initials: D
authors.lastname: Balachandran
authors.forename: Kammi J
authors.initials: KJ
authors.lastname: Henriksen
authors.forename: Cassandra E
authors.initials: CE
authors.lastname: Smith
authors.forename: Jiankun
authors.initials: J
authors.lastname: Tong
authors.forename: Bryan S
authors.initials: BS
authors.lastname: Clay
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Miller
authors.forename: Anne I
authors.initials: AI
authors.lastname: Sperling
mesh_terms: D000818:Animals; D015551:Autoimmunity / Q000276:immunology; D002118:Calcium / Q000378:metabolism; D002454:Cell Differentiation; D002467:Cell Nucleus / Q000378:metabolism; D049109:Cell Proliferation; D002478:Cells, Cultured; D050990:GATA3 Transcription Factor / Q000378:metabolism; D007073:Immunoglobulin E / Q000097:blood; D007249:Inflammation / Q000276:immunology* / Q000378:metabolism; D015847:Interleukin-4 / Q000378:metabolism; D015848:Interleukin-5 / Q000276:immunology / Q000378:metabolism; D051917:Leukosialin / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D016688:Mice, Inbred NOD; D008817:Mice, Mutant Strains; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D012130:Respiratory Hypersensitivity / Q000276:immunology / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D018417:Th1 Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D018418:Th2 Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism
chemical_list: D050990:GATA3 Transcription Factor; C494748:Gata3 protein, mouse; D015848:Interleukin-5; D051917:Leukosialin; D011948:Receptors, Antigen, T-Cell; D015847:Interleukin-4; D007073:Immunoglobulin E; D002118:Calcium