title: Induction of T-cell proliferation by recombinant mouse and chimeric mouse/human anti-CD3 monoclonal antibodies.
abstract: The isotype of anti-CD3 mAb has a dramatic effect on anti-CD3 induced T-cell activation, as was previously reported for switch variants (IgG2b to IgA) of a high-avidity IgG1 anti-CD3 mAb (CLB-T3/4.1). In order to study and compare the isotype dependency of T-cell activation with anti-CD3 mAb of various mouse and human subclasses, we now prepared recombinant anti-CD3 mAb. The variable region of the anti-CD3 Ig heavy chain was cloned, joined with genes for the heavy chain constant region and expressed in a cell line only secreting autologous mouse chi light chains. Thus we obtained cell lines that produced mouse (m) IgM, mIgG3 and chimaeric mouse/human (h) IgM, hlgG1, hlgG2, hlgG3, hlgG4, hlgE and hlgA2 anti-CD3. The matched set of mouse and mouse/human chimaeric anti-CD3 isotypes switch variants was then used to study activation of T cells in an accessory cell-dependent system. hlgG1, hlgG4, hlgE, mlgG2a and mlgE induced T-cell proliferation in PBMC of all donors tested, whereas PBMC from a subset of donors were unresponsive to stimulation with hlgG2, hlgG3, hlgA2, mlgG1 and mlgG2b anti-CD3 mAb. hlgM, mlgM and mlgA were only able to induce T-cell mitogenesis in combination with PMA. Our panel of anti-CD3 mAb variants may prove a powerful tool to study mouse and human isotype-dependent effector functions and their influence on T-cell activation requirements in detail.
authors.affiliation: Central Laboratory of the Netherlands Red Cross Blood Transfusion Service, Amsterdam.
authors.forename: P W
authors.initials: PW
authors.lastname: Parren
authors.forename: M E
authors.initials: ME
authors.lastname: Geerts
authors.forename: L C
authors.initials: LC
authors.lastname: Boeije
authors.forename: L A
authors.initials: LA
authors.lastname: Aarden
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D001483:Base Sequence; D015153:Blotting, Western; D017252:CD3 Complex; D002460:Cell Line; D003001:Cloning, Molecular; D006801:Humans; D006825:Hybridomas; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007132:Immunoglobulin Isotypes / Q000276:immunology*; D007147:Immunoglobulin Light Chains / Q000235:genetics; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D007143:Immunoglobulin Heavy Chains; D007132:Immunoglobulin Isotypes; D007147:Immunoglobulin Light Chains; D011948:Receptors, Antigen, T-Cell; D011993:Recombinant Fusion Proteins