Bim must be able to engage all pro-survival Bcl-2 family members for efficient tumor suppression

Oncogene. 2012 Jul 12;31(28):3392-6. doi: 10.1038/onc.2011.508. Epub 2011 Nov 14.


Overexpression of the transcriptional regulator Myc is thought to be the cause or a contributing factor in the development of a large number of human lymphomas and certain other cancers. Apoptotic cell death constitutes a tumor suppressive mechanism, particularly in the context of Myc overexpression. Accordingly, lymphoma development in Eμ-Myc transgenic mice, which mimic the Myc/IgH chromosomal translocation that causes Burkitt lymphoma, is accelerated by concomitant overexpression of anti-apoptotic Bcl-2 family members or loss of pro-apoptotic BH3-only proteins, such as Bim. Bim binds with high affinity to all pro-survival Bcl-2-like proteins and can also interact with Bax/Bak, but it remains unclear which of these interactions are critical for its tumor suppressive function. We have previously generated knock-in mutant mice in which the BH3 region of Bim has been exchanged with that for Bad, Noxa or Puma so that it can only bind to select pro-survival Bcl-2-like proteins: Bim(Bad) binding to Bcl-2, Bcl-x(L) and Bcl-w, but not Mcl-1 or A1; Bim(Noxa) binding only to Mcl-1 and A1 and as a control, Bim(Puma), which can still bind all pro-survival Bcl-2-like proteins. We have now inter-crossed these Bim mutant mice with Eμ-Myc transgenic mice, and found that both the Bim(Bad) and the Bim(Noxa) mutations but not the Bim(Puma) mutation greatly accelerate Myc-induced lymphoma development and increase leukemic burden. These results demonstrate that for optimal tumor suppressive activity, Bim must be able to interact with all and not just select pro-survival Bcl-2 family members.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis Regulatory Proteins / genetics
  • Apoptosis Regulatory Proteins / metabolism*
  • Bcl-2-Like Protein 11
  • Cell Survival
  • Humans
  • Lymphoma / genetics
  • Lymphoma / metabolism*
  • Lymphoma / pathology*
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Mice
  • Mice, Transgenic
  • Mutation
  • Protein Binding
  • Proto-Oncogene Proteins / genetics
  • Proto-Oncogene Proteins / metabolism*
  • Proto-Oncogene Proteins c-bcl-2 / metabolism*
  • Proto-Oncogene Proteins c-myc / genetics


  • Apoptosis Regulatory Proteins
  • BCL2L11 protein, human
  • Bcl-2-Like Protein 11
  • Bcl2l11 protein, mouse
  • Membrane Proteins
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-bcl-2
  • Proto-Oncogene Proteins c-myc