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Area of Science:

  • Biomedical Engineering
  • Molecular Biology
  • Oncology

Background:

  • Tissue mechanics are crucial for development and homeostasis, but their role in tumor progression is not fully understood.
  • Altered tissue mechanics, particularly increased matrix stiffness, are observed in tumors, yet the underlying molecular mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which altered tissue mechanics regulate tumor progression.
  • To investigate the role of microRNA (miRNA) expression in response to matrix stiffness in cancer.

Main Methods:

  • Investigated the effects of matrix stiffness on miRNA expression in human and mouse tissues.
  • Analyzed the relationship between extracellular matrix stiffness, miR-18a, PTEN, and HOXA9 levels in breast tumor biopsies.
  • Correlated miR-18a expression with clinical outcomes in breast cancer patients.

Main Results:

  • Increased matrix stiffness induces miR-18a expression, leading to reduced levels of tumor suppressors PTEN and HOXA9.
  • Extracellular matrix stiffness significantly correlated with miR-18a expression in human breast tumors.
  • High miR-18a expression was associated with lower PTEN and HOXA9 levels in basal-like breast cancers and predicted poor prognosis in luminal breast cancers.

Conclusions:

  • A mechanically regulated microRNA circuit involving miR-18a, PTEN, and HOXA9 promotes malignancy.
  • miR-18a and HOXA9 levels may serve as prognostic biomarkers for stratifying patients with luminal breast cancers.