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- W2059338577 abstract "We and others have previously demonstrated that delayed administration of the prodrug ganciclovir (GCV) protects mice from lethal GVHD while maintaining GVL activity after BMT with allogeneic naive (uncultured) thymidine kinase (TK)-expressing transgenic T cells. However, the efficacy of GCV control of GVHD and its impact on GVL activity following BMT with ex vivo activated, TK transduced and selected (Td) donor T cells has not been thoroughly characterized because of the significantly reduced GVHD-inducing potential of cultured cells compared to naive T cells in both preclinical models and initial clinical trials. In these experiments, we used A20 tumor cells (B cell lymphoma of BALB/c origin) that were modified to stably express a click beetle red luciferase-EGFP fusion reporter gene (A20-CBRluc/egfp) and monitored disease progression in vivo using optical bioluminescence imaging (BLI). To induce leukemia, BALB/c recipients were lethally irradiated and reconstituted with C57BL/6 BM supplemented with or without A20-CBRluc/egfp leukemia cells. Mice receiving leukemia cells were then left untreated or injected with 4 × 106 ΔCD34-TK (chimeric fusion suicide gene) Td donor T cells the day of BMT. Ten of ten BALB/c mice transplanted with BM and A20-CBRluc/egfp cells exhibited tumor engraftment and growth, with 8 mice dying from leukemia before day 35. In contrast, we observed no significant tumor signal in the majority (92%) of untreated (No GCV) mice that received ΔCD34-TK Td T cells. However, these animals developed GVHD with high mortality (P = .003 compared to BM only control) and significant weight loss (P < .05 from day 10 onward compared to BM only control). Although mice treated with GCV from days 4–10 after BMT were protected from GVHD, 50% of these animals developed leukemia. In contrast, none of the mice developed leukemia if GCV treatment was delayed until day 10 after BMT. Importantly, this GVL effect was obtained in the absence of GVHD, as evidenced by the improved survival (88% survival at day 60 post-BMT) and weight gain of the day 10–16 GCV treated mice compared to the untreated (No GCV) control. These data suggest that donor T cell dependent GVL effects against A20 cells can be preserved while the severity of GVHD is reduced, further demonstrating the potential of the HSV-TK/GCV system to reduce acute GVHD without impairing GVL activity." @default.
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- W2059338577 date "2006-02-01" @default.
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- W2059338577 title "Delayed GCV-mediated ablation of ΔCD34-tk transduced and selected murine T cells preserves GVL activity while mitigating GVHD" @default.
- W2059338577 doi "https://doi.org/10.1016/j.bbmt.2005.11.206" @default.
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