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P53 mutations in stromal fibroblasts sensitize tumors against chemotherapy

Daniel Lafkas1, George Trimis, Athanasios G Papavassiliou

  • 1Department of Biological Chemistry, University of Athens Medical School, 11527 Athens, Greece.

International Journal of Cancer
|May 31, 2008
PubMed

Insights

Cancer-associated fibroblasts with p53 mutations accelerate tumor growth but enhance chemotherapy effectiveness. This occurs through fibroblast senescence and paracrine signaling, highlighting stromal cells as key regulators of cancer treatment efficacy.

Area of Science:

  • Oncology
  • Cancer Biology
  • Cellular Mechanisms in Cancer

Background:

  • Chemotherapy efficacy is often attributed to cancer cell-autonomous processes.
  • The role of the tumor stroma, particularly fibroblasts, in modulating treatment response is frequently overlooked.

Purpose of the Study:

  • To investigate the impact of p53 mutations in stromal fibroblasts on tumor development and chemotherapy response.
  • To elucidate the underlying mechanisms by which stromal p53 mutations influence anticancer therapy outcomes.

Main Methods:

  • Analysis of p53 mutations in cancer-associated fibroblasts from primary breast and prostate tumors.
  • Assessment of tumor growth and response to conventional chemotherapies (doxorubicin, cis-platinum) in the presence of mutated stromal p53.
  • Investigation of fibroblast senescence and paracrine signaling pathways.

Main Results:

  • p53 mutations in stromal fibroblasts accelerate tumor initiation and progression.
  • These mutations paradoxically sensitize tumors to doxorubicin and cis-platinum chemotherapy.
  • The mechanism involves the induction of senescence in fibroblasts, leading to paracrine growth factor production that affects cancer cells.

Conclusions:

  • Stromal fibroblasts play a critical, often underestimated, role in modulating chemotherapy efficacy.
  • Targeting or understanding the behavior of p53-mutated stromal cells could offer novel therapeutic strategies.
  • Fibroblast senescence induced by p53 mutations is a key mediator of altered tumor response to chemotherapy.

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