Abstract
Rapamycin (RAPA) is an immunosuppressive drug that prevents and treats graft-versus-host disease (GVHD) after allogeneic hematopoietic cell transplant (HCT). One possible mechanism for its efficacy is induction of tolerance, through increased number or enhanced survival of regulatory T cells. In our experiments, B10.D2 BM and splenocytes were injected into lethally irradiated BALB/cJ recipients. The mice received i.p. injections of either RAPA or vehicle control on days 1–28. There was a significant survival advantage in RAPA-treated mice. Evaluation of the skin biopsies showed a dense cellular infiltrate in RAPA-treated mice. Further characterization of these cells revealed a higher percentage of regulatory T cells characterized by FoxP3-positive cells in high-dose RAPA-treated mice as compared with controls on day 30. This effect appears to be dose dependent. When peripheral blood analysis for FoxP3-positive cells was performed, there was no significant difference observed in the RAPA-treated mice as compared with control mice. These data show a novel mechanism of rapamycin in GVHD, accumulation of regulatory T cells in the GVHD target tissue: the skin.
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Acknowledgements
Many thanks to Zouwei Su, PhD, for his help in the preparation of the histopathology.
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Palmer, J., Chen, B., DeOliveira, D. et al. Novel mechanism of rapamycin in GVHD: increase in interstitial regulatory T cells. Bone Marrow Transplant 45, 379–384 (2010). https://doi.org/10.1038/bmt.2009.140
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DOI: https://doi.org/10.1038/bmt.2009.140
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