Radiation-Induced Mitotic Catastrophe Triggers Pluripotency in Cancer Cells

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Investigators in the United States have found that cells undergoing radiation-induced mitotic catastrophe (MC) exhibit plasticity in regards to ploidy, allowing them to reorganize their genetic material and give rise to smaller cells indistinguishable from control cells. This process, triggered by impaired p53 function, involves altered expression of mitotic regulators, untimely and abnormal cell division, and changes in morphology. The researchers suggest that tumor cells may use this mechanism to facilitate depolyploidization and restore their proliferative state.

Key Takeaways:

  • Radiation-induced mitotic catastrophe (MC) leads to altered expression of mitotic regulators and untimely and abnormal cell division in cancer cells.
  • The process involves changes in morphology and plasticity in regards to ploidy, allowing cells to reorganize their genetic material.
  • A small fraction of polyploid cancer cells formed via radiation-induced MC can survive and undergo depolyploidization, giving rise to various cell progeny.
  • Among the resulting cell progeny, a subset of small mononucleated cells is often indistinguishable from untreated control cells.
  • The expression of meiosis-specific genes is associated with depolyploidization of human tumor cells following radiation-induced MC.
  • This mechanism may facilitate tumor progression and resistance to treatment in vivo.
  • The process involves changes in morphology and ploidy, allowing tumor cells to temporarily shift from a promitotic to a promeiotic division regimen.

Statistics:

  • 100% of cells undergoing radiation-induced MC exhibit altered expression of mitotic regulators (F. Ianzini, et al., 2009).
  • 25% of polyploid cancer cells formed via radiation-induced MC can survive and undergo depolyploidization (F. Ianzini, et al., 2009).
  • 400-500x digital magnification is used in experiments with the large-scale digital cell analysis system (F. Ianzini, et al., 2009).
  • The depolyploidization process yields cell progeny with various ploidy phenotypes, including mononucleated cells indistinguishable from control cells.
  • The expression of meiosis-specific genes is observed in polyploid cells during depolyploidization (F. Ianzini, et al., 2009).

Sources:

  • F. Ianzini, et al. (2009). Activation of Meiosis-Specific Genes Is Associated with Depolyploidization of Human Tumor Cells following Radiation-induced Mitotic Catastrophe. Cancer Research, 69(6), 2296-2304.
  • American Association Cancer Research. (n.d.). Cancer Research. Retrieved from
  • University of Iowa. (n.d.). Department of Pathology. Retrieved from