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Aged and BRCA-Mutated Stromal Cells Drive Epithelial Cell Transformation.

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High-risk mesenchymal stromal/stem cells (hrMSCs) drive high-grade serous ovarian cancer initiation by altering fallopian tube cells. These hrMSCs are linked to BRCA1/2 mutations and aging, offering new avenues for early detection and prevention.

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Area of Science:

  • Oncology
  • Cell Biology
  • Stem Cell Biology

Background:

  • High-grade serous ovarian cancer (HGSOC) initiation mechanisms remain poorly understood, hindering prevention and early detection efforts.
  • Existing models suggest transformation of fallopian tube epithelial (FTE) cells into precursor lesions (STIC) leading to HGSOC.

Purpose of the Study:

  • To investigate the role of mesenchymal stem cell niches in HGSOC initiation prior to STIC lesion formation.
  • To identify novel cellular players involved in the early stages of ovarian cancer development.

Main Methods:

  • Characterization of epigenetically altered mesenchymal stromal/stem cells (hrMSCs) in the fallopian tube microenvironment.
  • Assessment of hrMSC interactions with FTE cells, including DNA damage and survival effects.
  • In vivo studies to evaluate the role of hrMSCs in inducing malignant transformation and metastasis.

Main Results:

  • Identified a novel cell population, hrMSCs, present before STIC lesions and enriched in STIC stroma.
  • Demonstrated that hrMSCs promote DNA damage and survival in FTE cells, leading to malignant transformation and metastasis in vivo.
  • Found hrMSCs are significantly enriched in BRCA1/2 mutation carriers and increase with age.

Conclusions:

  • hrMSCs play a critical role in inciting HGSOC initiation through stromal-mediated epithelial transformation.
  • These findings have significant implications for developing new strategies for ovarian cancer detection and prevention.
  • The identification of hrMSCs provides a new perspective on cancer initiation, potentially applicable across various cancer types.