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The Extracellular Matrix01:42

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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
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Fully Human Tumor-based Matrix in Three-dimensional Spheroid Invasion Assay
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Bioengineering multicellular tumor spheroids with tunable extracellular matrix deposition.

Alessandro Motta1, Rasika Daware1, Alessia Nucci1

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This study standardized multicellular tumor spheroids (MCTS) by tuning cancer cell-fibroblast ratios, improving their resemblance to in vivo tumors and drug screening accuracy.

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BioengineeringExtracellular matrixFibrosisMulticellular tumor spheroidsTumor microenvironment

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Area of Science:

  • Biomedical Engineering
  • Cancer Biology
  • 3D Cell Culture Models

Background:

  • Conventional 2D cell culture assays inadequately model the complex tumor microenvironment.
  • Three-dimensional multicellular tumor spheroids (MCTS) offer a promising platform for studying tumor biology and drug responses.
  • Standardization of MCTS formation methodologies is lacking, particularly regarding stromal content.

Purpose of the Study:

  • To systematically investigate how varying cancer cell-fibroblast ratios impact MCTS architecture, molecular profiles, and functionality.
  • To establish a reproducible strategy for engineering MCTS with tunable stromal content and desmoplastic activity.
  • To enhance the accuracy and relevance of 3D in vitro tumor models for drug screening and biological research.

Main Methods:

  • Co-culture of four cancer cell lines with fibroblasts at defined ratios to create MCTS with increasing stromal content.
  • Analysis of MCTS using histology, live fluorescence microscopy, immunofluorescence, flow cytometry, and gene expression assays.
  • Quantification of growth kinetics, cell organization, proliferation, ECM deposition, and phenotypic states.

Main Results:

  • Cancer cell identity and fibroblast proportion significantly influenced spheroid compactness, internal architecture, desmoplastic activity, and proliferation.
  • Fibroblast-rich MCTS exhibited increased extracellular matrix (ECM) deposition and upregulation of genes related to fibroblast activation and ECM remodeling.
  • Increasing stromal content in MCTS reduced sensitivity to chemotherapeutics, more accurately reflecting in vivo drug responses.

Conclusions:

  • A reproducible strategy was established for engineering MCTS with tunable stromal content, enhancing their resemblance to in vivo tumors.
  • These findings provide a standardized framework for generating MCTS with defined stromal properties, improving the reproducibility of 3D in vitro tumor models.
  • The developed MCTS platform enables controlled interrogation of tumor-stroma interactions and offers a foundation for studying stromal modulation of therapy response.