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Area of Science:

  • Oncology
  • Biophysics
  • Cancer Biology

Background:

  • Triple-negative breast cancer (TNBC) exhibits poorer prognoses than other breast cancer subtypes.
  • Cancer-associated fibroblasts (CAFs) within the tumor microenvironment (TME) influence TNBC progression.
  • VEGFR-2 (Vascular Endothelial Growth Factor Receptor 2) expression on TNBC correlates with reduced survival, and mechanical strain activates VEGFR-2 to promote angiogenesis.

Purpose of the Study:

  • To investigate the hypothesis that VEGFR-2 on TNBC cells can be mechanically activated.
  • To determine if mechanical activation of VEGFR-2 alters TNBC migration and proliferation.
  • To explore the role of mechanical strain and VEGFR-2 in TNBC progression within a TME model.

Main Methods:

  • A multi-microtissue TME model was established using MDA-MB-231 TNBC cells, CAFs, and normal breast fibroblasts (NBFs).
  • Mechanical strain was applied using magnetic beads in the absence of growth factors.
  • TNBC migration and proliferation (assessed by Ki67 staining) were quantified.

Main Results:

  • TNBC cells exhibited significantly increased migration towards CAFs compared to NBFs (5x).
  • Mechanical strain alone in the TME model increased TNBC migration by 2x.
  • Knockdown of VEGFR-2 reduced overall TNBC migration and proliferation, even under mechanical strain.

Conclusions:

  • Mechanical strain within the TME significantly enhances TNBC migration and proliferation.
  • VEGFR-2 plays a critical role in mediating the effects of mechanical strain on TNBC.
  • Targeting mechanosignaling via VEGFR-2 presents a potential therapeutic strategy for TNBC.