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c-Myc overexpression promotes a germinal center-like program in Burkitt's lymphoma

Abstract

The germinal center (GC) reaction has a pivotal function in human B-cell lymphomagenesis. Genetic aberrations occurring during somatic hypermutation and class switch recombination deregulate key factors controlling B-cell physiology and proliferation. Several human lymphoma entities are characterized by a constitutive GC phenotype and ongoing somatic hypermutation, but the molecular basis for this phenomenon is only partly understood. We have investigated the reasons for a constitutive GC-like program in Burkitt's lymphoma cells. Here, overexpression of c-Myc leads to a centroblast phenotype, promotes high constitutive expression of the key GC factors Bcl-6, E2A and activation-induced cytidine deaminase and contributes to proliferation and somatic hypermutation. Our findings elucidate how the activity of a pivotal transcription factor may freeze B-cell lymphoma cells in a constitutive GC-like state that is even maintained at an extrafollicular location.

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Acknowledgements

We thank Sabine Fischer-Burkart for expert technical assistance, Torsten Thiel for contributions to the RNAi system, Maren Mierau and Dirk Eick for discussion and support, and Ursula Zimber-Strobl, Georg Bornkamm and Ralf Küppers for critical reading of the manuscript. This work was supported by grants from the German José Carreras Leukemia Foundation (SP/03/10 and R05/10v), the Wilhelm Sander foundation (2003.046.2) and the Deutsche Forschungsgemeinschaft (TRR54-TPA4).

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Correspondence to B Jungnickel.

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Scheller, H., Tobollik, S., Kutzera, A. et al. c-Myc overexpression promotes a germinal center-like program in Burkitt's lymphoma. Oncogene 29, 888–897 (2010). https://doi.org/10.1038/onc.2009.377

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