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Phenotype modulation in vascular tissue engineering using biochemical and mechanical stimulation.

Jan P Stegemann1, Robert M Nerem

  • 1Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332-0363, USA.

Annals of Biomedical Engineering
|May 2, 2003
PubMed
Summary

Engineered blood vessels can be tailored by combining biochemical factors like platelet-derived growth factor (PDGF) and transforming growth factor beta (TGF-beta) with mechanical strain. This approach modulates cell phenotype and tissue properties for better engineered vascular constructs.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Engineered vascular constructs require precise control over cell behavior and tissue structure.
  • Smooth muscle cells (SMCs) are crucial components of blood vessels, influencing their mechanical properties and contractile function.
  • Current methods for engineering vascular tissues often lack the ability to finely tune cell phenotype and matrix organization.

Purpose of the Study:

  • To investigate the combined effects of biochemical stimulation and cyclic mechanical strain on engineered vascular constructs.
  • To determine how platelet-derived growth factor (PDGF) and transforming growth factor beta (TGF-beta) influence SMC behavior in a 3D collagen matrix under mechanical load.
  • To assess the modulation of gel compaction, cell proliferation, and smooth muscle alpha-actin (SMA) expression in response to these stimuli.

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Main Methods:

  • Engineered vascular constructs were fabricated using isolated smooth muscle cells within a 3D collagen type 1 matrix.
  • Biochemical stimulation was achieved by adding PDGF or TGF-beta to the culture medium.
  • Cyclic mechanical strain (10% circumferential strain at 1 Hz) was applied using a bioreactor system.

Main Results:

  • Mechanical stimulation alone increased gel compaction and cell proliferation.
  • PDGF enhanced cell proliferation but decreased SMA expression, counteracting mechanical stimulation's effects and leading to a more open matrix.
  • TGF-beta inhibited cell proliferation, increased SMA expression (especially with mechanical strain), and resulted in a dense matrix.

Conclusions:

  • Cell phenotype in engineered blood vessels can be effectively modulated by combining specific biochemical factors (PDGF, TGF-beta) with mechanical stimuli.
  • The study demonstrates a method to control engineered tissue properties by tailoring the cellular response to combined stimuli.
  • This controlled modulation of cell function offers a pathway to optimize the characteristics of engineered vascular tissues.