Abstract: T-cell responses are initiated via contact with MHC/peptide complexes on antigen presenting cells (APCs). The fate of these complexes, however, is unknown. Here, using live APCs expressing MHC class I molecules fused with green-fluorescent protein, we show that peptide-specific T-cell/APC interaction induces clusters of MHC I molecules to congregate within minutes at the contact site; thereafter, these MHC I clusters are acquired by T-cells in small aggregates.,We further demonstrate that acquisition of MHC I by T-cells correlates with TCR down regulation and the APC-derived MHC I molecules are endocytosed and degraded by-T-cells. These data suggest a novel mechanism by which TCR recognition of MHC/peptide complexes can be curtailed by internalization of MHC molecules by T-cells.

Abstract: The present invention relates to synthetic antigen-presenting matrices, their methods of making and their methods of use. One such matrix is cells that have been transfected to produce MHC antigen-presenting molecules and assisting molecules such as co-stimulatory molecules. The matrices can be used to activate CD8+ T-cells to produce cytokines and become cytotoxic.

Abstract: The present invention relates to synthetic antigen-presenting matrices, their methods of making and their methods of use. One such matrix is cells that have been transfected to produce MHC antigen-presenting molecules and assisting molecules such as co-stimulatory molecules. The matrices can be used to activate CD8+ T-cells to produce cytokines and become cytotoxic.

Abstract: Cytotoxic T lymphocytes (CTLs) specific for antigenic peptides derived from IgE molecule can be generated in vitro by stimulating resting naive CD8 T cells with IgE peptides presented by artificial antigen presenting cells. The IgE specific CTLs lyse the target cells loaded with IgE peptides in vitro and inhibit antigen specific IgE response in vivo. In addition, adoptive transfer of the IgE specific CTL to an asthmatic mouse model can inhibit the development of lung inflammation and airway hypersensitivity. IgE specific CTL provides a treatment for allergic asthma and other IgE-mediated allergic diseases. Antigenic peptides identified from non-tumor self-antigens induce specific cytotoxic T lymphocyte (CTL) in vitro. The CTL induced by peptides identified from CD40L can kill activated CD4 T cells. In vitro generated CTL specific for CD40L inhibit CD4-dependent antibody responses of all isotypes in vivo.

Abstract: The present invention relates to synthetic antigen-presenting matrices, their methods of making and their methods of use. One such matrix is cells that have been transfected to produce MHC antigen-presenting molecules and assisting molecules such as co-stimulatory molecules. The matrices can be used to activate CD8+ T-cells to produce cytokines and become cytotoxic.

Abstract: Materials and methods for activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, a method for producing a synthetic antigen presenting cell line for activating T lymphocytes to a specific peptide is described.

Abstract: Materials and methods for activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, a method for producing a synthetic antigen presenting cell line for activating T lymphocytes to a specific peptide is described.

Abstract: Materials and methods for activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, a method for producing a synthetic antigen presenting cell line for activating T lymphocytes to a specific peptide is described.

Abstract: Materials and methods of activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, a synthetic antigen presenting matrix for activating T lymphocytes to a specific peptide is described.

Abstract: T-cell responses are initiated via contact with MHC/peptide complexes on antigen presenting cells (APCs). The fate of these complexes, however, is unknown. Here, using live APCs expressing MHC class I molecules fused with green-fluorescent protein, we show that peptide-specific T-cell/APC interaction induces clusters of MHC I molecules to congregate within minutes at the contact site; thereafter, these MHC I clusters are acquired by T-cells in small aggregates. We further demonstrate that acquisition of MHC I by T-cells correlates with TCR down regulation and the APC-derived MHC I molecules are endocytosed and degraded by T-cells. These data suggest a novel mechanism by which TCR recognition of MHC/peptide complexes can be curtailed by internalization of MHC molecules by T-cells.

Abstract: Materials and methods of activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, a method for producing a synthetic antigen presenting drosophila cell line for activating T lymphocytes to a specific peptide is described.

Abstract: Materials and methods of activating T lymphocytes with specificity for particular antigenic peptides are described, as well as the use of activated T lymphocytes in vitro for the treatment of a variety of disease conditions. In particular, fragments of cells for activating T lymphocytes to a specific peptide are described.

Abstract: The present invention relates to methods for producing synthetic matrix for activating T lymphocytes.

Abstract: The present invention relates to methods for activating T lymphocytes using a synthetic matrix, and for specifically activating T lymphocytes reactive to a specific peptide.