title: Expression and characterization of a divalent chimeric anti-human CD3 single chain antibody.
abstract: Murine anti-CD3 monoclonal antibodies (MoAbs) are used in clinical practice for immunosuppression. However, there are two major drawbacks to this treatment: the associated cytokine release syndrome and human anti-mouse antibody response. To overcome these side-effects, the authors generated a chimeric anti-human CD3 single chain antibody, scUCHT1. It is an IgM variant of UCHT1, a mouse IgG1 MoAb directed against human CD3. scUCHT1 consists of the light and heavy variable chain binding domains of UCHT1 and a human IgM Fc region (CH2 to CH4). scUCHT1 was produced by COS-7 and SP2/0 transfectants, and mainly assembled in a dimeric form. It retained the binding specificity and affinity of the parental MoAb UCHT1. In contrast to UCHT1, scUCHT1 did not induce T-cell proliferation and cytokine release (TNF-alpha and IFN-gamma) in in vitro assays. These results suggest that the engineered chimeric anti-CD3 single chain antibody (scUCHT1) may be useful in clinical immunosuppressive treatment.
authors.affiliation: Laboratory of Molecular Biology, National Institute of Mental Health, Bethesda, MD 20892-4034, USA.
authors.forename: S
authors.initials: S
authors.lastname: Ma
authors.forename: J
authors.initials: J
authors.lastname: Thompson
authors.forename: H
authors.initials: H
authors.lastname: Hu
authors.forename: D M
authors.initials: DM
authors.lastname: Neville
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry* / Q000235:genetics* / Q000494:pharmacology; D000915:Antibody Affinity; D000918:Antibody Specificity; D001483:Base Sequence; D017252:CD3 Complex / Q000276:immunology*; D005822:Genetic Vectors; D006801:Humans; D007075:Immunoglobulin M / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D007371:Interferon-gamma / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008969:Molecular Sequence Data; D011993:Recombinant Fusion Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D000911:Antibodies, Monoclonal; D017252:CD3 Complex; D007075:Immunoglobulin M; D011993:Recombinant Fusion Proteins; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma