Cutting Edge: Stimulation of CD28 with B7–2 Promotes Focal Adhesion-Like Cell Contacts Where Rho Family Small G Proteins Accumulate in T Cells

Abstract

Abstract Unless a costimulatory signal is provided, TCR recognition of Ag bound to the MHC is insufficient to induce optimal T cell proliferation or the production of IL-2. Here we show that the stimulation of CD28, a T cell costimulatory receptor, by a specific Ab increases F-actin contents in T cells. The interaction between T cells and B7–2-transfected Chinese hamster ovary cells expressing the CD28 ligand leads to the rearrangement of the actin cytoskelton in the region of cell-cell contact. Within the Rho family of G proteins, Rac1, but not Rho, translocates to the sites of cell-cell contact where Tailin also accumulates. These results indicate that the interaction between B7–2 and CD28 establishes a focal adhesion-like cell contact between T cell and APCs. The results also suggest that CD28 signaling is primarily transduced by a cytoskeletal rearrangment/signaling pathway mediated by the Rho family G proteins.