Dissociating graft-versus-tumor (GVT) effect from acute graft-versus-host disease (GVHD) still remains a great challenge in allogeneic bone marrow transplantation (allo-BMT). Bortezomib, a proteasome inhibitor, has shown impressive efficacy as a single agent in patients with hematologic malignancies but can result in toxicity when administered late after allogeneic transplantation in murine models of GVHD. In the current study, the effects of T-cell subsets and their associated cytokines on the efficacy of bortezomib in murine allogeneic BMT were investigated. Increased levels of serum tumor necrosis factor-α (TNFα) and interferon-γ (IFNγ) were observed after allo-BMT and continuous bortezomib administration. Bortezomib-induced GVHD-dependent mortality was preventable by depletion of CD4 + but not CD8 + T cells from the donor graft. The improved survival correlated with markedly reduced serum TNFα but not IFNγ levels. Transfer of Tnf -/- T cells also protected recipients from bortezomib-induced GVHD-dependent toxicity. Importantly, prolonged administration of bortezomib after transplantation of purified CD8 + T cells resulted in enhanced GVT response, which was dependent on donor CD8 + T cell-derived IFNγ. These results indicate that decreased toxicity and increased efficacy of bortezomib in murine allo-BMT can be achieved by removal of CD4 + T cells from the graft or by inhibiting TNFα.
ASJC Scopus subject areas
- Cell Biology