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pubmed-article:8245479pubmed:abstractTextSLE and mixed connective tissue disease (MCTD) are characterized by the presence of high titers of autoantibodies against uridine-rich RNA-small nuclear ribonucleoprotein (snRNP) Ag. Because the presence of such snRNP-reactive autoantibodies has recently been shown to be associated with polymorphisms of HLA, this study was undertaken to determine whether snRNP-reactive T cells could be identified and characterized from patients. PBMC were stimulated with affinity-purified snRNP Ag and cloned by limiting dilution in the presence of rIL-2 and rIL-4, snRNP-reactive human T cell clones were generated from three patients and two healthy blood donors who possessed disease-associated HLA genotypes. The cell surface phenotype of clones determined by flow cytometry was CD3+, CD4+, CD45RO+, TCR V alpha beta+. TCR V beta analysis, performed using V beta-specific primers and polymerase chain reaction, revealed that the T cell lines generated were clonal; a limited number of TCR V beta genes were expressed among the clones tested. All clones tested by mAb blocking of Ag-induced proliferation were restricted by HLA-DR. Several T cell clones were identified that were specific for B'/B or D polypeptides. These results demonstrate that snRNP-reactive T cells can be isolated from SLE and MCTD patients in vitro, and that Ag-driven expansion of such T cells could play a role in the immunopathogenesis of these diseases in vivo.lld:pubmed
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pubmed-article:8245479pubmed:articleTitleHuman T cell clones reactive against U-small nuclear ribonucleoprotein autoantigens from connective tissue disease patients and healthy individuals.lld:pubmed
pubmed-article:8245479pubmed:affiliationDepartment of Internal Medicine, University of Missouri-Columbia School of Medicine.lld:pubmed
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pubmed-article:8245479pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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