title: Inhibition of Ly-6A antigen expression prevents T cell activation.
abstract: Antisense oligonucleotides complementary to the 5' end of the mRNA encoding the Ly-6A protein were used to block the expression of that protein. Using this approach we could inhibit the expression of Ly-6A by 60-80% in antigen-primed lymph node (LN) T cells as well as in the D10 T cell clone. Inhibition of Ly-6 expression resulted in the inability to restimulate in vitro, antigen-primed T cells. It also blocked the activation of normal spleen cells by Con A, monoclonal antibody (mAb) to CD3, and mAb to Ly-6. In contrast, stimulation of normal spleen cells with the pharmacological agents PMA + ionomycin were unaffected by the inhibition of Ly-6 expression. Similar results were obtained with the D10 T cell clone; stimulation with Con A + interleukin 1 (IL-1), antigen-presenting cells (APC), or the clonotypic antibody + IL-1 was greatly reduced in the presence of antisense oligonucleotides to Ly-6. Stimulation with PMA + ionomycin was again unaffected. We also studied the effect of antisense oligonucleotides on stimulation of preactivated D10 cells. Preactivation of D10 cells with Con A + IL-1 renders them receptive to secondary stimulation by other lymphokines. In this case, antisense oligonucleotides to Ly-6 had no effect on secondary activation with IL-2, IL-4 + IL-1, or PMA + ionomycin. We conclude from these studies that Ly-6 expression is required for T cell receptor (TCR)-mediated T cell activation.
authors: Department of Periodontics, University of North Carolina, Chapel Hill 27599.
authors: P M
authors: PM
authors: Flood
authors: J P
authors: JP
authors: Dougherty
authors: Y
authors: Y
authors: Ron
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D000950:Antigens, Ly / Q000096:biosynthesis / Q000276:immunology*; D001483:Base Sequence; D017252:CD3 Complex; D004247:DNA; D005260:Female; D005434:Flow Cytometry; D015870:Gene Expression / Q000187:drug effects; D066298:In Vitro Techniques; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008969:Molecular Sequence Data; D009841:Oligonucleotides / Q000235:genetics / Q000494:pharmacology; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D015398:Signal Transduction / Q000187:drug effects; D013154:Spleen / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D017252:CD3 Complex; D009841:Oligonucleotides; D011948:Receptors, Antigen, T-Cell; D004247:DNA