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Related Concept Videos

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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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Updated: Jun 26, 2025

A Cancer Cell Spheroid Assay to Assess Invasion in a 3D Setting
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Different contractility modes control cell escape from multicellular spheroids and tumor explants.

Eliane Blauth1, Steffen Grosser2, Frank Sauer1

  • 1Peter Debye Institute for Soft Matter Physics, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany.

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Summary

Cancer cell escape from tumors involves a balance between tissue surface tension and contractile traction. This cellular contractility interplay is key for metastasis formation and may serve as a prognostic marker for tumor aggressiveness.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Biophysics

Background:

  • Cells dynamically switch between migratory and homeostatic states via active contractile properties.
  • Collective tissue surface tension and bipolar cellular contractility influence cell cluster compactness and extracellular matrix (ECM) interaction.
  • Understanding these contractility modes is crucial for investigating cancer cell invasion and metastasis.

Purpose of the Study:

  • To investigate the relationship between tissue surface tension and contractile traction in cancer cell escape into the ECM.
  • To compare contractility modes in breast cancer cell line spheroids and patient-derived tumor explants.
  • To determine the role of contractility interplay in cancer cell invasion and metastasis formation.

Main Methods:

  • Culturing multicellular spheroids from breast cancer cell lines.
  • Analyzing primary tumor explants from breast and cervical cancer patients.
  • Quantifying matrix contraction and cellular spreading into collagen matrices mimicking the ECM.

Main Results:

  • Tumor aggressiveness in spheroids correlates with elevated contractile traction and reduced active tissue surface tension, facilitating cancer cell escape.
  • The interplay between contractility modes, not a binary switch, is essential for cancer cell invasion.
  • Patient-derived tumor explants confirm that these contractility modes affect cancer cells' ability to leave cell clusters.

Conclusions:

  • Cellular contractility plays a critical role in metastasis formation.
  • The balance between contractile traction and tissue surface tension influences cancer cell invasion.
  • Cellular contractility may serve as a prognostic criterion for assessing tumor aggressiveness.