Increase in positive selection of CD8 super(+) T cells in TAP1-mutant mice by human beta sub(2)-microglobulin transgene

Mice harboring a deletion of the gene encoding the transporter associated with antigen presentation-1 (TAP1) are impaired in providing major histocompatibility complex (MHC) class I molecules with peptides of cytosolic origin and lack stable MHC class I cell surface expression. They consequently have a strongly reduced number of CD8 super(+) T cells. To examine whether selection of CD8 super(+) T cells is dependent on TAP-dependent peptides, we partially restored MHC class I cell surface expression in TAP1-deficient mice by introduction of human beta sub(2)-microglobulin. We show that selection of function CD8 super(+) T cells can be augmented in vivo in the absence of TAP1-dependent peptides.