title: Analysis of the role of leukocyte function-associated antigen-1 in activation of human influenza virus-specific T cell clones.
abstract: The role of leukocyte function-associated Ag-1 (LFA-1) in intercellular adhesion is well documented. Previously, we demonstrated that the LFA-1 molecule (CD11a/CD18) can also regulate the induction of proliferation of peripheral blood T cells. In these studies, we observed opposite effects of antibodies against CD11a (LFA-1-alpha-chain) or CD18 (LFA-1-beta-chain). Here, we determined the effects of anti-CD11a and anti-CD18 mAb on proliferation of cloned influenza virus-specific T cells. Anti-CD18 mAb had similar inhibiting effects on the proliferative response of T cell clones induced by immobilized anti-CD3 mAb as it had on the response of peripheral blood T cells. In contrast to its costimulatory effect on resting peripheral blood T cells, anti-CD11a mAb did not increase the proliferation of cloned T cells. Similar differences in effects of anti-CD11a and anti-CD18 mAb were observed when proliferation of the T cell clones was induced by immobilized anti-TCR mAb. When proliferation was induced by influenza virus presented by monocytes as APC, both anti-CD11a and anti-CD18 mAb inhibited T cell proliferation. However, when EBV-transformed B cells were used as APC, neither anti-CD11a nor anti-CD18 mAb inhibited proliferation. These results demonstrate that the effects of antibodies against CD11a (LFA-1-alpha) or CD18 (LFA-1-beta) on T cell proliferation depend on 1) the stage of activation of the T cells, 2) the activation stimulus and its requirement for intercellular adhesion involving LFA-1, and 3) the type of cell used to present Ag.
authors.affiliation: Central Laboratory of the Netherlands Red Cross Blood Transfusion Service, Amsterdam, The Netherlands.
authors.forename: K C
authors.initials: KC
authors.lastname: Kuijpers
authors.forename: T W
authors.initials: TW
authors.lastname: Kuijpers
authors.forename: W P
authors.initials: WP
authors.lastname: Zeijlemaker
authors.forename: C J
authors.initials: CJ
authors.lastname: Lucas
authors.forename: R A
authors.initials: RA
authors.lastname: van Lier
authors.forename: F
authors.initials: F
authors.lastname: Miedema
mesh_terms: D000938:Antigen-Presenting Cells / Q000276:immunology; D000943:Antigens, Differentiation / Q000276:immunology / Q000502:physiology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology; D001402:B-Lymphocytes / Q000276:immunology; D018821:CD18 Antigens; D017252:CD3 Complex; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002999:Clone Cells; D006801:Humans; D066298:In Vitro Techniques; D009980:Influenza A virus / Q000276:immunology*; D008213:Lymphocyte Activation; D016169:Lymphocyte Function-Associated Antigen-1; D009000:Monocytes / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D016028:Receptors, Leukocyte-Adhesion / Q000276:immunology / Q000502:physiology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D018821:CD18 Antigens; D017252:CD3 Complex; D016169:Lymphocyte Function-Associated Antigen-1; D011948:Receptors, Antigen, T-Cell; D016028:Receptors, Leukocyte-Adhesion