Abstract
Understanding the basis of chemoresistance is a principal goal of molecular oncology. We have exploited a murine lymphoma model and retroviral gene transfer to rapidly generate a series of spontaneous tumors differing only in a gene of interest, and subsequently studied the impact of the test gene on the treatment sensitivity of tumors at their natural site. We demonstrate that the Bcl-2 oncoprotein produces multi-drug resistance when assessed in primary lymphomas in vivo. In contrast, this effect was dramatically reduced when the primary lymphomas were subjected to long-term culture, and completely missed in the standard clonogenic survival assay. This model highlights the importance of physiological test systems to address the complexity of clinical drug resistance and provides a novel strategy to evaluate compounds targeting specific genetic lesions.
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Acknowledgements
We thank A.W. Harris for the Eμ-myc transgenic mice, C.J. Sherr for the T220-29 cells, W.S. Pear for the MSCV-IRES-GFP construct, K. Sokol and C. Cordon-Cardo for histopathology, S. Lee, M.E. McCurrach, J. Fridman, G. Ferbeyre and M. Narita for helpful comments, and L. Bianco and the CSHL Animal Facility for technical assistance. Supported by grants from the American Cancer Society (RPG-99-200-01-LBC) and the Laurie Strauss Leukemia Foundation (S.W.L.). C.A.S. is a Dr. Mildred Scheel Cancer Foundation fellow and S.W.L. is a Rita Allen Foundation Scholar.
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Schmitt, C., Rosenthal, C. & Lowe, S. Genetic analysis of chemoresistance in primary murine lymphomas. Nat Med 6, 1029–1035 (2000). https://doi.org/10.1038/79542
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DOI: https://doi.org/10.1038/79542
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