Targeting mitotic exit leads to tumor regression in vivo: Modulation by Cdk1, Mastl, and the PP2A/B55α,δ phosphatase

Cancer Cell. 2010 Dec 14;18(6):641-54. doi: 10.1016/j.ccr.2010.10.028.

Abstract

Targeting mitotic exit has been recently proposed as a relevant therapeutic approach against cancer. By using genetically engineered mice, we show that the APC/C cofactor Cdc20 is essential for anaphase onset in vivo in embryonic or adult cells, including progenitor/stem cells. Ablation of Cdc20 results in efficient regression of aggressive tumors, whereas current mitotic drugs display limited effects. Yet, Cdc20 null cells can exit from mitosis upon inactivation of Cdk1 and the kinase Mastl (Greatwall). This mitotic exit depends on the activity of PP2A phosphatase complexes containing B55α or B55δ regulatory subunits. These data illustrate the relevance of critical players of mitotic exit in mammals and their implications in the balance between cell death and mitotic exit in tumor cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anaphase
  • Animals
  • CDC2 Protein Kinase / antagonists & inhibitors*
  • Cdc20 Proteins
  • Cell Cycle Proteins / antagonists & inhibitors*
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / physiology
  • Cells, Cultured
  • Female
  • Metaphase
  • Mice
  • Mice, Inbred C57BL
  • Mitosis*
  • Neoplasms, Experimental / pathology
  • Neoplasms, Experimental / therapy*
  • Protein Phosphatase 2 / physiology*
  • Protein-Serine-Threonine Kinases / antagonists & inhibitors*
  • Tamoxifen / analogs & derivatives
  • Tamoxifen / pharmacology

Substances

  • Cdc20 Proteins
  • Cdc20 protein, mouse
  • Cell Cycle Proteins
  • Tamoxifen
  • afimoxifene
  • Protein-Serine-Threonine Kinases
  • CDC2 Protein Kinase
  • Protein Phosphatase 2