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Related Concept Videos

Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...

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Micropatterning and Assembly of 3D Microvessels
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Microfluidics embedded within extracellular matrix to define vascular architectures and pattern diffusive gradients.

Brendon M Baker1, Britta Trappmann, Sarah C Stapleton

  • 1Tissue Microfabrication Lab, Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Lab on a Chip
|June 22, 2013
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Summary

Researchers developed a 3D microfluidic system to create controlled molecular gradients in extracellular matrix (ECM). This technology precisely guides cell behavior, like angiogenesis, by patterning microchannels within the ECM for tissue engineering and developmental studies.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Developmental Biology

Background:

  • Diffusive molecular gradients in the extracellular matrix (ECM) are crucial for biological processes like development and angiogenesis.
  • The complex spatial distribution of these factors is influenced by vasculature and cell interactions.
  • Existing 3D cell culture models struggle to replicate these precise gradient conditions.

Purpose of the Study:

  • To develop a novel microfluidic approach for generating controlled, spatially defined soluble gradients within a 3D ECM.
  • To enable the study of morphogenetic processes and cell guidance in a more physiologically relevant 3D environment.
  • To create a versatile platform for tissue engineering and drug screening applications.

Main Methods:

  • Fabrication of microfluidic channels within a 3D ECM using sacrificial conduits and photolithography.
  • Integration of microchannels with external flow systems via a specialized gasket.
  • Demonstration of sustained gradient patterning and independent cell seeding in channels and ECM.
  • Creation of model vascular networks using endothelial cells to study angiogenesis.

Main Results:

  • Successfully generated stable, architecture-dependent diffusive gradients within the 3D ECM.
  • Demonstrated independent cell culture within microchannels and the surrounding ECM.
  • Showcased that microchannel architecture dictates diffusion patterns, influencing endothelial sprouting and angiogenic locations.
  • Identified strong gradient locations as key sites for angiogenic sprouting, mimicking in vivo mechanisms.

Conclusions:

  • The developed 3D microfluidic system offers a flexible platform for precise control over soluble factor gradients.
  • This approach facilitates the study of 3D morphogenetic events, particularly angiogenesis.
  • The technology holds promise for tissue engineering applications, including spatially defined vasculature creation and screening of morphogenetic factors.