CD2 (OKT11) augments CD3-mediated intracellular signaling events in human T lymphocytes

CD2 (LFA-2) is expressed on thymocytes, natural killer cells, and virtually all peripheral T cells. CD2 binds to its primary ligand CD58 (LFA-3) on antigen presenting cells (APC) and stabilizes the T cell-APC interaction; this stable interaction then optimizes Ag-specific T-cell activation. We asses...

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Bibliographic Details
Published inJournal of investigative medicine Vol. 48; no. 2; p. 102
Main Authors Berney, S M, Schaan, T, Wolf, R E, van der Heyde, H, Atkinson, T P
Format Journal Article
LanguageEnglish
Published England 01.03.2000
Subjects
Animals
Antibodies, Monoclonal
Antigens, CD - metabolism
Antigens, Differentiation, T-Lymphocyte - metabolism
CD2 Antigens - metabolism
CD3 Complex - metabolism
Humans
Lectins, C-Type
Lymphocyte Activation
Mice
Phosphatidylinositols - metabolism
Signal Transduction
T-Lymphocytes - immunology
T-Lymphocytes - metabolism
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Summary:CD2 (LFA-2) is expressed on thymocytes, natural killer cells, and virtually all peripheral T cells. CD2 binds to its primary ligand CD58 (LFA-3) on antigen presenting cells (APC) and stabilizes the T cell-APC interaction; this stable interaction then optimizes Ag-specific T-cell activation. We assessed whether CD2-cross-linking by mAb augments the process of T-cell stimulation through the TCR/CD3 complex. Plate-bound anti-CD2 or anti-CD3 mAb alone had no measurable effect on any of the assessed activation parameters of resting T cells. However, concomitant signaling through both CD2 and CD3 by plate-bound antibodies resulted in marked increases in CD69 expression on the T-cell surface and T-cell-cellular metabolism, as assessed by the ability of the cell to reduce 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxylmethoxyphenyl)-2-( 4-sulphophenyl)- 2H-tetrazolium (MTS) to formazen. In addition, simultaneous cross-linking of CD2 and CD3 caused a significant (P < 0.001) increase in phosphatidylinositol hydrolysis in resting T cells compared to stimulation with anti-CD3 mAb alone and anti-CD3 mAb plus anti-CD2 isotype control antibody. These results indicate that CD2 augments signaling through CD3, and consequently functions as a costimulatory molecule for resting T cells in the initial activation step.
ISSN:1081-5589