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Senescent Cells in Growing Tumors: Population Dynamics and Cancer Stem Cells

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  • Caterina A M La Porta
  • Stefano Zapperi
  • James P Sethna

Abstract

Tumors are defined by their intense proliferation, but sometimes cancer cells turn senescent and stop replicating. In the stochastic cancer model in which all cells are tumorigenic, senescence is seen as the result of random mutations, suggesting that it could represent a barrier to tumor growth. In the hierarchical cancer model a subset of the cells, the cancer stem cells, divide indefinitely while other cells eventually turn senescent. Here we formulate cancer growth in mathematical terms and obtain predictions for the evolution of senescence. We perform experiments in human melanoma cells which are compatible with the hierarchical model and show that senescence is a reversible process controlled by survivin. We conclude that enhancing senescence is unlikely to provide a useful therapeutic strategy to fight cancer, unless the cancer stem cells are specifically targeted. Author Summary: It is commonly believed that cell senescence – the loss of replicative capacity of cells – acts as a barrier for tumor growth. Here we follow the evolution of senescence markers in melanoma cells and find that while most cancer cells eventually turn senescent, this is at root irrelevant for the long-term growth rate of a tumor. To demonstrate this, we construct a mathematical population dynamics model incorporating cancer stem cells which is able to reproduce quantitatively the experimental data. Our results support the existence of cancer stem cells in melanoma and explain why it is difficult to fight cancer by inducing senescence in cancer cells. Only a fraction of the cells are susceptible to senescence, but those cells are irrelevant for tumor growth. A successful therapeutic strategy should instead target cancer stem cells, which are, however, likely to be strongly resistant to drug induced senescence.

Suggested Citation

  • Caterina A M La Porta & Stefano Zapperi & James P Sethna, 2012. "Senescent Cells in Growing Tumors: Population Dynamics and Cancer Stem Cells," PLOS Computational Biology, Public Library of Science, vol. 8(1), pages 1-13, January.
  • Handle: RePEc:plo:pcbi00:1002316
    DOI: 10.1371/journal.pcbi.1002316
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    1. Elizabeth Clayton & David P. Doupé & Allon M. Klein & Douglas J. Winton & Benjamin D. Simons & Philip H. Jones, 2007. "A single type of progenitor cell maintains normal epidermis," Nature, Nature, vol. 446(7132), pages 185-189, March.
    2. Raffaella Di Micco & Marzia Fumagalli & Angelo Cicalese & Sara Piccinin & Patrizia Gasparini & Chiara Luise & Catherine Schurra & Massimiliano Garre’ & Paolo Giovanni Nuciforo & Aaron Bensimon & Rober, 2006. "Oncogene-induced senescence is a DNA damage response triggered by DNA hyper-replication," Nature, Nature, vol. 444(7119), pages 638-642, November.
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