Beta-catenin expression results in p53-independent DNA damage and oncogene-induced senescence in prelymphomagenic thymocytes in vivo
- PMID: 18160717
- PMCID: PMC2258783
- DOI: 10.1128/MCB.01360-07
Beta-catenin expression results in p53-independent DNA damage and oncogene-induced senescence in prelymphomagenic thymocytes in vivo
Abstract
The expression of beta-catenin, a potent oncogene, is causally linked to tumorigenesis. Therefore, it was surprising that the transgenic expression of oncogenic beta-catenin in thymocytes resulted in thymic involution instead of lymphomagenesis. In this report, we demonstrate that this is because the expression of oncogenic beta-catenin induces DNA damage, growth arrest, oncogene-induced senescence (OIS), and apoptosis of immature thymocytes. In p53-deficient mice, the expression of oncogenic beta-catenin still results in DNA damage and OIS, but the thymocytes survive and eventually progress to thymic lymphoma. beta-Catenin-induced thymic lymphomas are distinct from lymphomas that arise in p53(-/-) mice. They are CD4(-) CD8(-), while p53-dependent lymphomas are largely CD4(+) CD8(+), and they develop at an earlier age and in the absence of c-Myc expression or Notch1 signaling. Thus, we report that oncogenic beta-catenin-induced, p53-independent growth arrest and OIS and p53-dependent apoptosis protect developing thymocytes from transformation by oncogenic beta-catenin.
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