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Tumor stroma-derived TGF-beta limits myc-driven lymphomagenesis via Suv39h1-dependent senescence

Maurice Reimann1, Soyoung Lee, Christoph Loddenkemper

  • 1Charité - Universitätsmedizin Berlin/Molekulares Krebsforschungszentrum der Charité - MKFZ, 13353 Berlin, Germany.

Cancer Cell
|March 16, 2010
PubMed

Insights

Cancer cells with Myc activation induce senescence through macrophage-secreted TGF-beta. Blocking TGF-beta or Suv39h1 accelerates tumor growth by preventing this crucial cellular senescence.

Area of Science:

  • Oncology
  • Cellular Biology
  • Cancer Research

Background:

  • Oncogene activation (RAS/BRAF, Myc) triggers DNA damage response (DDR) in early cancer.
  • RAS/BRAF-induced DDR leads to tumor-suppressive cellular senescence.
  • Myc activation typically induces apoptosis rather than senescence.

Purpose of the Study:

  • To investigate the mechanism by which Myc activation induces cellular senescence.
  • To explore the role of non-cell-autonomous signals in Myc-driven tumorigenesis.
  • To determine if feedback senescence induction can limit lymphoma development.

Main Methods:

  • Utilized the Emu-myc transgenic mouse lymphoma model for in vivo studies.
  • Investigated the role of macrophages and transforming growth factor beta (TGF-beta) in senescence induction.
  • Examined the impact of TGF-beta neutralization and Suv39h1 inactivation on tumor progression.
  • Validated findings in human aggressive B cell lymphomas.

Main Results:

  • Apoptotic lymphoma cells activate macrophages to secrete TGF-beta, a key inducer of cellular senescence.
  • Neutralization of TGF-beta significantly accelerated Myc-driven tumor development.
  • Genetic inactivation of Suv39h1 also accelerated tumor growth by canceling senescence.
  • These mechanisms were recapitulated in human aggressive B cell lymphomas.

Conclusions:

  • Tumor-associated macrophages secrete TGF-beta, inducing senescence in Myc-driven lymphomas.
  • Stromal-derived signals can act as a feedback mechanism to limit tumorigenesis.
  • Targeting TGF-beta or senescence pathways may offer therapeutic strategies for aggressive B cell lymphomas.

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