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Area of Science:

  • Cell Biology
  • Cancer Research
  • Biomaterials Science

Background:

  • Local tissue invasion is a critical step in breast cancer progression.
  • Malignant leader cells can induce non-invasive follower cells to invade.
  • The effect of stromal extracellular matrix (ECM) exposure on follower cell phenotype is not well understood.

Purpose of the Study:

  • To investigate matrix-mediated gene expression and phenotypic responses in epithelial cells exposed to the stromal ECM.
  • To elucidate the mechanisms by which stromal ECM influences epithelial cell invasion.

Main Methods:

  • Utilized a 3D epithelial morphogenesis model with biochemically and mechanically defined matrices.
  • Examined gene expression, including mesenchymal markers like MT1-MMP.
  • Assessed the role of matrix anchorage and signaling pathways (Src, PI3K, Rac1) in invasion.

Main Results:

  • 3D collagen matrix upregulated mesenchymal gene expression, including MT1-MMP, which was essential for invasion.
  • Epithelial invasion was dependent on matrix anchorage and signaling via Src, PI3K, and Rac1.
  • Increasing collagen stiffness correlated with increased dispersive epithelial cell invasion.

Conclusions:

  • Leader cell-mediated access to stromal ECM can induce an invasive phenotype in follower epithelial cells.
  • This process involves matrix-dependent gene expression and signaling pathways.
  • Invasive follower cells may actively contribute to local tissue invasion in breast cancer.