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Valve Tissue Engineering with Living Absorbable Threads.

Albert Ryszard Liberski1, Christophe Michel Raynaud1, Nadia Ayad2

  • 1Sidra Medical and Research Center, P. O. Box 26999, Doha, Qatar.

Macromolecular Bioscience
|September 13, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed "living threads" using poly(ε-caprolactone) fibers that attract human mesenchymal stem cells (MSCs). These threads enable precise cell and fiber orientation for tissue engineering, including heart valves.

Keywords:
heart valveleafletsliving threadsorgan weavingtissue engineering

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine
  • Stem Cell Biology

Background:

  • Tissue engineering (TE) requires precise cell seeding and orientation on scaffolds for functional tissue development.
  • Existing TE techniques face challenges in achieving physiological cell arrangement and structural complexity.
  • Developing advanced biomaterials is crucial for creating functional living tissues.

Purpose of the Study:

  • To introduce a novel method for creating "living threads" for tissue engineering applications.
  • To assess the ability of poly(ε-caprolactone) fibers to attract and support human mesenchymal stem cells (MSCs).
  • To demonstrate the utility of these living threads in fabricating complex, physiologically oriented tissue structures like heart valves.

Main Methods:

  • Fabrication of thin poly(ε-caprolactone) fibers with varying diameters (23-243 μm) to serve as living threads.
  • Culturing and seeding of human mesenchymal stem cells (MSCs) onto the fabricated fibers.
  • Analysis of MSC adhesion, proliferation, and epitope expression (via fluorescence activated cell sorting) on fibers and in standard culture.
  • Construction of dimensional shapes mimicking human valve structures using the cell-populated fibers.

Main Results:

  • Poly(ε-caprolactone) fibers effectively attracted and firmly adhered human mesenchymal stem cells (MSCs).
  • The living threads facilitated the creation of 3D structures, such as cup-like shapes resembling human heart valves.
  • Crucially, the method preserved the specific physiological orientation of both MSCs and the poly(ε-caprolactone) fibers within the constructs.
  • MSCs cultured on the fibers exhibited similar epitope expression to those cultured conventionally, indicating maintained cell phenotype.

Conclusions:

  • The developed living threads offer a versatile and effective platform for tissue engineering.
  • This novel approach allows for precise control over cell and scaffold architecture, crucial for functional tissue regeneration.
  • Living absorbable fibers hold significant promise for TE applications, particularly in the regeneration of complex tissues like heart valves.