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A biological hybrid model for collagen-based tissue engineered vascular constructs.

Joseph D Berglund1, Michael M Mohseni, Robert M Nerem

  • 1School of Chemical Engineering, Georgia Institute of Technology, 30332, Atlanta, GA, USA.

Biomaterials
|January 16, 2003
PubMed
Summary

This study introduces a construct-sleeve hybrid (CSH) graft for small diameter blood vessel tissue engineering. The CSH graft utilizes a biological support sleeve to enhance mechanical strength during cell-mediated remodeling, improving vascular graft viability.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Vascular Surgery

Background:

  • Small diameter blood vessel tissue engineering often requires long culture times or synthetic materials for mechanical integrity.
  • Existing methods struggle to achieve sufficient mechanical properties to withstand hemodynamic forces in the vasculature.

Purpose of the Study:

  • To present a novel construct-sleeve hybrid (CSH) graft for enhanced small diameter blood vessel tissue engineering.
  • To evaluate the mechanical properties and cellular function of CSH grafts utilizing biological support sleeves.

Main Methods:

  • Fabrication of Type I collagen support sleeves crosslinked with glutaraldehyde, UV, or dehydrothermal treatments.
  • Creation of CSH grafts by molding a cell-containing collagen layer around the support sleeve.

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  • Assessment of mechanical strength via uniaxial tensile testing and burst testing, alongside cell viability and histological analysis after in vitro culture.

    • Main Results:

    • Crosslinking treatments significantly increased the stiffness and tensile strength of acellular support sleeves.
    • CSH grafts with uncrosslinked and glutaraldehyde-treated sleeves showed substantial increases in ultimate stress (20.4-fold and 121-fold, respectively) and burst pressures (100 mmHg and 650 mmHg).
    • Cell viability and function remained largely unimpaired in CSH constructs.

    Conclusions:

    • The construct-sleeve hybrid approach offers a promising strategy for improving the mechanical properties of engineered blood vessels.
    • Biological support sleeves enhance graft strength, facilitating cell-mediated remodeling for potential clinical applications in vascular repair.