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History of hypoxia exposure aids future cell invasion according to cell type and collagen density.

José A Almeida1,2, Diego B Avila1, Gregory D Longmore3,4

  • 1Department of Biomedical Engineering, Washington University, St. Louis, MO 63130.

Molecular Biology of the Cell
|May 6, 2025
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Summary
This summary is machine-generated.

Past exposure to low oxygen (hypoxia) enhances cancer cell invasion, even in denser tissues. Hypoxia-primed cells produce laminin332, increasing adhesion and invasion, a process disrupted by Cdh3 depletion.

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Area of Science:

  • Cancer Biology
  • Tumor Microenvironment Dynamics
  • Cellular Mechanobiology

Background:

  • Tumor microenvironments become denser and hypoxic during cancer progression.
  • Cell invasion is influenced by matrix density and oxygen levels.
  • The impact of prior oxygen conditions on future cell invasion is not well understood.

Purpose of the Study:

  • To investigate how past hypoxia exposure affects cancer cell invasion in varying collagen densities.
  • To elucidate the molecular mechanisms underlying hypoxia-induced changes in cell invasion.
  • To determine the role of laminin332 and Cdh3 in hypoxia-primed invasion.

Main Methods:

  • Culturing normal human mammary epithelial cells (MCF10A) and breast tumor cells (BT549) under normoxia and hypoxia.
  • Assessing cell invasion rates and collagen deformation in different collagen densities.
  • Utilizing gene depletion (Cdh3) and protein analysis (laminin332) to study molecular mechanisms.

Main Results:

  • Past hypoxia exposure significantly increased cell invasion and collagen deformation compared to normoxia controls.
  • Hypoxia-primed cells showed enhanced invasion in dense collagen, contrary to normoxia controls.
  • Hypoxia-primed cancer cells produced more laminin332, mediating increased cell-matrix adhesion and invasion.
  • Depletion of Cdh3 abolished the hypoxia-induced increase in invasion and laminin332 production.

Conclusions:

  • Hypoxia 'memory' in cancer cells enhances their invasive potential, particularly in denser matrices.
  • Laminin332 production, regulated by Cdh3, is a key mediator of this hypoxia-induced invasive phenotype.
  • Understanding past oxygen conditions is crucial for predicting tumor invasion in evolving microenvironments.