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

H Scheller1, S Tobollik, A Kutzera

  • 1Institute of Clinical Molecular Biology, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany.

Oncogene
|November 3, 2009
PubMed

Insights

Overexpression of c-Myc in Burkitt's lymphoma causes a germinal center (GC) phenotype, promoting proliferation and somatic hypermutation. This explains how c-Myc can lock B-cell lymphomas in a GC-like state.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • The germinal center (GC) reaction is crucial in B-cell lymphomagenesis.
  • Genetic alterations in somatic hypermutation and class switch recombination disrupt B-cell regulation.
  • Many lymphomas exhibit a persistent GC phenotype, but the underlying mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the molecular basis of a constitutive GC-like program in Burkitt's lymphoma cells.
  • To understand the role of c-Myc in maintaining this GC-like state.

Main Methods:

  • Analysis of gene expression in Burkitt's lymphoma cells.
  • Investigating the impact of c-Myc overexpression on GC factors.
  • Assessing effects on cell proliferation and somatic hypermutation.

Main Results:

  • Overexpression of c-Myc induces a centroblast phenotype.
  • c-Myc drives high constitutive expression of key GC factors: Bcl-6, E2A, and activation-induced cytidine deaminase.
  • This contributes to uncontrolled proliferation and somatic hypermutation in lymphoma cells.

Conclusions:

  • c-Myc activity can establish and maintain a constitutive GC-like state in B-cell lymphomas.
  • This phenomenon persists even in extrafollicular locations.
  • Findings provide insight into the molecular drivers of B-cell lymphomagenesis.

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