title: T helper 2 (Th2) but not Th1 clones co-stimulate resting T cells in the presence of anti-CD3 monoclonal antibody.
abstract: We have investigated the effects of monoclonal antibody (mAb) to the CD3 epsilon protein on interactions between small, resting T cells and antigen-specific T helper clones. Highly purified, splenic T cells lacking identifiable accessory cells do not proliferate in a thymidine uptake assay to anti-CD3 mAb, Con A, rIL-2, rIL-4, or irradiated T helper clones (both Th1 and Th2). However, the responding T cells proliferate significantly to the combined stimulus of Th2 clones and anti-CD3 antibody. Only the Th2, not the Th1, subpopulation of T helper cells has the ability to induce a T cell response. The Th2 cell-dependent activation of small resting T cells does not require the external cross-linkage of the anti-CD3 mAb via Fc receptor expressing cells or the secretion of lymphokines from the Th2 helper clones, but it is inhibitable by anti-LFA 1 antibody. Thus, Th2 clones provide a co-stimulatory signal which in conjunction with anti-CD3 mAb causes resting T cell proliferation in the absence of conventional accessory cells.
authors.affiliation: Committee on Immunology, University of Chicago, IL 60637.
authors.forename: B D
authors.initials: BD
authors.lastname: Evavold
authors.forename: A
authors.initials: A
authors.lastname: Yokoyama
authors.forename: R
authors.initials: R
authors.lastname: Hirsch
authors.forename: J A
authors.initials: JA
authors.lastname: Bluestone
authors.forename: J
authors.initials: J
authors.lastname: Quintans
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D002450:Cell Communication / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D005260:Female; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D011948:Receptors, Antigen, T-Cell; D011961:Receptors, Fc; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D008222:Lymphokines; D011948:Receptors, Antigen, T-Cell; D011961:Receptors, Fc