title: Characterization and expression of the human T cell receptor-T3 complex by monoclonal antibody F101.01.
abstract: A murine monoclonal antibody (MoAb) F101.01 reacting with the T cell receptor (TCR)-T3 complex is presented. Immunohistological studies showed that F101.01 specifically stains T-zone lymphocytes in lymph nodes, tonsils, and splenic tissue. Two-colour immunofluorescence and flow cytometry demonstrated co-expression of the antigen defined by F101.01 and the pan-T cell antigens defined by CD2, CD3, CD5, and CD7 antibodies. Cells stained with CD4 and CD8 antibodies were both included in the F101.01-positive population, whereas CD16-positive natural killer cells (NK), B cells (CD19 and CD20), and myeloid cells (CD13 and CD33) were excluded. The target antigen of F101.01 co-modulated with the CD3-defined antigen (T3) and the TCR recognized by the MoAb WT-31. CD3 antibody and WT-31 both blocked binding of F101.01. F101.01 precipitated the TCR-T3 complex from lysates of 125I-labelled peripheral blood mononuclear cells (PBMC) and HPB-ALL, when the lysate was prepared with a detergent (digitonin) that conserves the TCR-T3 complex. FACS analysis of T cells from a patient with a T cell immunodeficiency demonstrated that delta-TCS-1-CD3+CD4+ and delta-TCS-1-CD3+CD8+ cells were brightly F101.01+, whereas a large subpopulation of delta-TCS-1+CD3+CD4-CD8- cells were weakly F101.01+. We conclude that F101.01 recognizes a conformational epitope of the TCR-T3 complex and that it reacts with the alpha beta TCR-T3 and the gamma delta TCR-T3 complexes with different intensities.
authors.affiliation: Department of Infectious Diseases, State University Hospital, Copenhagen, Denmark.
authors.forename: C
authors.initials: C
authors.lastname: Geisler
authors.forename: T
authors.initials: T
authors.lastname: Plesner
authors.forename: G
authors.initials: G
authors.lastname: Pallesen
authors.forename: K
authors.initials: K
authors.lastname: Skjødt
authors.forename: N
authors.initials: N
authors.lastname: Odum
authors.forename: J K
authors.initials: JK
authors.lastname: Larsen
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology* / Q000502:physiology; D001667:Binding, Competitive; D017252:CD3 Complex; D004705:Endocytosis; D005434:Flow Cytometry; D006651:Histocytochemistry; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000276:immunology; D011487:Protein Conformation; D011948:Receptors, Antigen, T-Cell / Q000276:immunology* / Q000502:physiology; D013601:T-Lymphocytes / Q000276:immunology* / Q000502:physiology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D011948:Receptors, Antigen, T-Cell