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Modeling of Tumor Cell Adhesion, Extravasation, and Sorting in a Microvascular System.

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Numerical models reveal how blood flow mechanics influence circulating tumor cell (CTC) metastasis. Red blood cell aggregates boost CTC adhesion, while cell shape, not elasticity, aids transmigration through narrow vessels.

Keywords:
Adhesive dynamic modelCirculating tumor cellsEffects of blood flow on tumor cell adhesion and transmigrationMicrofluidic device for cell separatingMicrovessel curvatureSingle cell traversing a narrow slit

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Area of Science:

  • Biophysics
  • Computational Biology
  • Cancer Metastasis Research

Background:

  • Understanding circulating tumor cell (CTC) metastasis is crucial for cancer treatment.
  • Current knowledge gaps exist in the precise mechanical underpinnings of CTC extravasation.
  • Biochemical and biological studies have advanced CTC metastasis understanding, but mechanical aspects require further investigation.

Purpose of the Study:

  • To numerically model the mechanical processes of CTC extravasation, including adhesion and transmigration.
  • To investigate the influence of blood flow dynamics and cellular interactions on CTC metastasis.
  • To optimize microfluidic device design for CTC separation.

Main Methods:

  • Numerical simulations of CTC adhesion and transmigration in microvessels.
  • Analysis of wall shear stress gradients and blood's particulate nature effects on CTCs.
  • Modeling single-cell passage through narrow slits to assess shape and elasticity roles.
  • Simulations of CTC-red blood cell (RBC) separation in microfluidic devices.

Main Results:

  • CTCs preferentially adhere to positively curved microvessel regions due to favorable wall shear stress gradients.
  • Red blood cell (RBC) aggregates enhance CTC adhesion by providing an additional wall-directed force.
  • Cell shape and surface area are more critical than elasticity for transmigration through narrow constrictions.
  • Microfluidic device designs were optimized for CTC-RBC separation under various flow conditions.

Conclusions:

  • Blood flow dynamics and cellular interactions significantly impact CTC extravasation and metastatic potential.
  • The particulate nature of blood, particularly RBC aggregation, plays a key role in CTC adhesion.
  • Cellular deformability, specifically shape and surface area changes, is essential for navigating microvessel constrictions.
  • Computational modeling provides a powerful tool for understanding CTC mechanics and optimizing diagnostic/therapeutic microfluidic devices.