Abstract: Methods for inducing T cell tolerance to a tissue or organ graft in a transplant recipeint are disclosed. The methods involve administering to a subject: 1) an allogeneic or xenogeneic cell which expresses donor antigens and which has a ligand on the cell surface which interacts with a receptor on the surface of a recipient T cell which mediates contact-dependent helper effector function; and 2) an antagonist of the receptor which inhibits interaction of the ligand with the receptor. In a preferred embodiment, the allogeneic or xenogeneic cell is a B cell, preferably a resting B cell, and the molecule on the surface of the T cell which mediates contact-dependent helper effector function is gp39. A preferred gp39 antagonist is an anti-gp39 antibody. The allogeneic or xenogeneic cell and the gp39 antagonist are typically administered to a transplant recipient prior to transplantation of the tissue or organ.

Abstract: The present invention relates, at least in part, to methods of modulating apoptosis in cells, comprising contacting the cell with a compound that modulates the expression, post-translational modification, or activity of Ian4, leucine-rich protein of 130 kD, GRP78, GRP94, or hsp60. The subject methods can be used to treat a variety of different disorders, for example, autoimmune disease and neoplasia. The invention also pertains to methods for identifying compounds that modulates the activity of Ian-4, leucine-rich protein of 130 kD, GRP78, GRP94, or hsp60.

Abstract: The invention relates to the methods for producing hematopoietic chimerism and central tolerance by peripheral tolerance induction without myeloablative conditioning.