title: Differential immunomodulation by anti-CD2 monoclonal antibodies of anti-CD3-induced T cell activation: dependence upon the individual anti-CD3 monoclonal antibody used for activation.
abstract: Two monoclonal antibodies (mAb) recognizing different CD2 epitopes each inhibited anti-CD3-induced proliferation and anti-CD3-induced increase in surface CD2 expression. The magnitude of inhibition by either anti-CD2 mAb was dependent upon which anti-CD3 mAb was used as the stimulus, being more pronounced when the anti-CD3 mAb 454 was used as the stimulus than when either anti-CD3 mAb 147 or 446 was the stimulus. The effects of neuraminidase-treated sheep erythrocytes (which bind to CD2) were also more pronounced on mAb 454-induced proliferation than on mAb 147- or 446-induced proliferation. Furthermore, the effects of preincubation with anti-CD2 mAb depended upon the responder status of the donor to IgG1 anti-CD3 mAb. Preincubation of high-responder cells with anti-CD2 mAb had little effect on subsequent IgG1 anti-CD3-induced proliferation. In contrast, preincubation of low-responder cells with anti-CD2 mAb usually augmented the otherwise small proliferative response to IgG1 anti-CD3 mAb. Taken together, these observations suggest that interaction of surface CD2 with ligand alters the response of T cells to anti-CD3 mAb, but these effects depend upon the individual anti-CD3 mAb used for stimulation. These studies raise the possibility that perturbation of different parts of the CD3-T cell antigen receptor complex may lead to different sequelae, and, as a result, the T cell may respond to a given immunomodulator in different ways.
authors: Department of Medicine, University of Southern California, Los Angeles 90033.
authors: W
authors: W
authors: Stohl
authors: D N
authors: DN
authors: Posnett
authors: N
authors: N
authors: Chiorazzi
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology*; D018801:CD2 Antigens; D017252:CD3 Complex; D004306:Dose-Response Relationship, Immunologic; D004705:Endocytosis; D000939:Epitopes; D006801:Humans; D008213:Lymphocyte Activation; D011940:Receptor Aggregation; D011948:Receptors, Antigen, T-Cell / Q000502:physiology*; D011971:Receptors, Immunologic / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D000939:Epitopes; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic