Abstract
Conventional immunosuppressive drugs have been used effectively to prevent immunologic rejection in organ transplantation. Individuals taking these drugs are at risk, however, for the development and recurrence of cancer. In the present study we show that the new immunosuppressive drug rapamycin (RAPA) may reduce the risk of cancer development while simultaneously providing effective immunosuppression. Experimentally, RAPA inhibited metastatic tumor growth and angiogenesis in in vivo mouse models. In addition, normal immunosuppressive doses of RAPA effectively controlled the growth of established tumors. In contrast, the most widely recognized immunosuppressive drug, cyclosporine, promoted tumor growth. From a mechanistic perspective, RAPA showed antiangiogenic activities linked to a decrease in production of vascular endothelial growth factor (VEGF) and to a markedly inhibited response of vascular endothelial cells to stimulation by VEGF. Thus, the use of RAPA, instead of cyclosporine, may reduce the chance of recurrent or de novo cancer in high-risk transplant patients.
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Acknowledgements
The authors thank M. Cetto, E. Frank, B. Schwarz, C. Graeb, S. Tange and I. Iesalnieks for excellent technical assistance. This research was supported by grants from the Roche Organ Transplantation Research Foundation, the Deutsche Forschungsgemeinschaft (STE 960/1) and the REFORM A and B programs of the University of Regensburg.
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Guba, M., von Breitenbuch, P., Steinbauer, M. et al. Rapamycin inhibits primary and metastatic tumor growth by antiangiogenesis: involvement of vascular endothelial growth factor. Nat Med 8, 128–135 (2002). https://doi.org/10.1038/nm0202-128
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DOI: https://doi.org/10.1038/nm0202-128
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