Background. An adoptive transfer system was used to study the fate of alloreactive CD8+ H-2Kb-specific TCR transgenic (DES+) T cells in vivo after transplantation. Methods. A trace population of 2.0 x 106 CD8+DES+ T cells were adoptively transferred into syngeneic CBA.Ca (H-2(k)) mice 24 hr before transplantation of an H-2Kb+ or H-2Kb- cardiac allograft. Results. H-2Kb specific T cells proliferated and produced interleukin-2 and interferon-γ in response to H-2Kb+, but not H-2Kb- cardiac allografts. CD8+DES+ T cells that infiltrated the H-2Kb+ cardiac allografts developed a distinct cell surface and cytokine phenotype compared with the CD8+DES+ T cells that remained in the periphery. H-2Kb-specific graft infiltrating T cells (a) underwent a larger number of cell divisions (> =3), (b) increased in size, (c) up-regulated CD69, and (d) down-regulated CD62L. Conclusions. These results demonstrate that alloantigen-specific T cells can be monitored in vivo during the immune response to an allograft and that the fate of CD8+ T cells specific for the allogeneic class I molecules expressed by the graft is different between cells in the periphery and those that infiltrate the graft.
|Number of pages||10|
|Publication status||Published - 27 Feb 2000|