Cyclosporin Abrogates Virus-Specific T-Cell Control of EBV-Induced B-Cell Lymphoproliferation

Renal and cardiac recipients undergoing aggressive immunosuppressive therapy with cyclosporin A have been reported to have unusually high incidences of Epstein–Barr virus (EBV) genome–positive lymphomas. T cells have been shown to be of critical importance in controlling the lymphoproliferative potential of the EB virus.

EBV–specific T cell clones were generated in vitro by repeated antigenic restimulation in the presence of interleukin–2 (IL-2). These virus-specific cells were used to study cyclosporin A's effect on their activation, proliferation and cytotoxic function, and the possible abrogation of the cell's ability to control virus-induced lymphoproliferation.

In this study, we show that cyclosporin A does not interfere with antigen recognition, since the T cell cytotoxic potential is unchanged. However, cyclosporin A induces a dose–dependent reduction in membrane IL-2 receptor expression which consequently limits the proliferation of the antigen-activated cell. This may translate in vivo to an insufficient expansion of the cytotoxic T cells which controls the outgrowth of the EBV-infected B cell.