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YAP1 Dysfunction Promotes Molecular Properties Linked to Breast Cancer Susceptibility.

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YAP1 (Yes-Associated Protein 1) dysregulation in aging breast cells promotes cancer-susceptible states. This early molecular shift, before tumor formation, is linked to increased cancer risk and stem cell-like properties.

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Area of Science:

  • Oncology
  • Cell Biology
  • Aging Research

Background:

  • YAP1 (Yes-Associated Protein 1) is a co-transcription factor linked to cancer malignancy and stem cell traits.
  • YAP1 dysregulation correlates with aging in human mammary epithelia, specifically in luminal epithelial cells, the origin of breast cancer.
  • Age is a significant risk factor for breast cancer, prompting investigation into early molecular events driving susceptibility.

Purpose of the Study:

  • To investigate if YAP1 dysregulation contributes to early breast cancer progression by inducing cancer-susceptible cellular states.
  • To determine the role of YAP1 in aging human mammary epithelial cells (HMEC) concerning cancer risk.

Main Methods:

  • Analysis of YAP1 expression in human breast tissues stratified by age and genetic cancer risk.
  • Culturing primary human mammary epithelial cells (HMEC) to assess YAP1 expression and its downstream targets.
  • Overexpression of YAP1 in post-senescence HMEC to evaluate effects on cellular properties.

Main Results:

  • Increased YAP1 expression was observed in aging human breast tissues and cultured HMEC, alongside elevated YAP1 transcriptional targets.
  • Upregulated YAP1 in HMEC led to gene expression changes associated with stem cell fate, telomerase activity, and breast cancer progression.
  • YAP1 overexpression in post-stasis HMEC promoted increased growth potential and access to stem cell-like gene programs.

Conclusions:

  • YAP1 dysregulation in aging finite epithelial cells facilitates the adoption of stem cell-like states, contributing to cancer susceptibility.
  • YAP1 may act early in breast cancer development, preceding tumor formation, by imposing molecular states that increase susceptibility.
  • Findings suggest YAP1 plays a crucial role in the aging-associated increase in breast cancer risk.