Abstract
Genomic analyses revealed that many cancers have acquired abnormalities in their expression of pro- or anti-apoptotic members of the BCL-2 protein family. It is, however, unknown whether changes in pro- or anti-apoptotic BCL-2 family members have similar impact on tumorigenesis or whether changes in one subgroup have disproportionate impact. We compared the consequences of concomitant loss of anti-apoptotic Bclx and pro-apoptotic Bim on MYC-induced lymphomagenesis. Whereas only loss of both Bclx alleles markedly forestalled tumorigenesis, loss of a single Bim allele overcame this blockade. Conversely, loss of even a single Bim allele sufficed to substantially accelerate lymphomagenesis, and only loss of both but not loss of a single allele of Bclx could attenuate this acceleration. The evidence that modest (two-fold) monoallelic changes in the expression of at least some BH3-only proteins can profoundly impact tumorigenesis suggests that such aberrations, imposed by epigenetic or genetic changes, may expedite tumorigenesis more effectively than elevated expression of pro-survival BCL-2 family members. These findings further our understanding of the mechanisms of lymphomagenesis and possibly also cancer therapy.
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Acknowledgements
We thank PN Kelly (NIH) for previously published work that laid the foundation for the present study, G Siciliano and his team for animal husbandry, the FACS facility and the histology facility at The Walter and Eliza Hall Institute. Work in the authors’ laboratory was supported by the National Health and Medical Research Council of Australia (program grant 461221/1016701, Fellowship 1020363, NHMRC Project 1046010), the Leukemia and Lymphoma Society (SCOR grant #7413; 7001-13), the Cancer Council Victoria (CCV grant 1052309), and fellowships from the Cancer Council of Victoria (SG), Lady Tata Postdoctoral Fellowship (SG), Melbourne International Research Scholarship (University of Melbourne, SG), Melbourne International Fee Remission Scholarship (University of Melbourne, SG), Australian Postgraduate Award (ARDD) and Cancer Therapeutics CRC Top-up Scholarship (SG and ARDD). This work was made possible by operational infrastructure grants through the Australian Government (IRISS) and the Victorian State Government (OIS).
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The authors are employed by The Walter and Eliza Hall Institute. The Walter and Eliza Hall Institute receives milestone payments from Genentech and AbbVie for the development of ABT-199 for cancer therapy.
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Delbridge, A., Grabow, S., Bouillet, P. et al. Functional antagonism between pro-apoptotic BIM and anti-apoptotic BCL-XL in MYC-induced lymphomagenesis. Oncogene 34, 1872–1876 (2015). https://doi.org/10.1038/onc.2014.132
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DOI: https://doi.org/10.1038/onc.2014.132
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