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Evaluation of composition and crosslinking effects on collagen-based composite constructs.

Krishna Madhavan1, Dmitry Belchenko, Antonella Motta

  • 1Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, USA.

Acta Biomaterialia
|October 10, 2009
PubMed
Summary

This study engineered collagen gel constructs with chitosan and elastin, improving mechanical properties for potential vascular graft materials. Genipin crosslinking enhanced endothelialization, offering a promising biomaterial design strategy.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Vascular grafts are crucial medical devices, but current materials face challenges in achieving optimal strength, compliance, and endothelialization.
  • Simultaneously satisfying all requirements for vascular graft materials remains a significant hurdle in regenerative medicine.

Purpose of the Study:

  • To engineer collagen-based vascular graft materials by incorporating mimetic components and evaluating different crosslinking strategies.
  • To assess the impact of chitosan and elastin additives on the mechanical and biological properties of collagen constructs.
  • To compare the efficacy of various crosslinkers (formaldehyde, genipin, EDAC) on construct performance and endothelialization.

Main Methods:

  • Engineering collagen gel constructs with additives like chitosan and elastin.

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  • Evaluating mechanical properties, including stress-strain curves, stretching ratio, and ultimate stress.
  • Assessing biological properties, focusing on endothelialization.
  • Investigating the effects of different crosslinkers (formaldehyde, genipin, EDAC) and gelation time on construct characteristics.

    • Main Results:

    • Incorporation of chitosan and/or elastin significantly improved the stretching ratio and ultimate stress of collagen constructs.
    • Microstructural modifications by chitosan sheets and elastin fibers were suggested as the cause of mechanical improvements.
    • Genipin crosslinking resulted in superior elongation and endothelial coverage compared to formaldehyde and EDAC.
    • Extended gelation time increased elastic modulus but did not affect ultimate strength.

    Conclusions:

    • Mimicking natural vessel tissues using biopolymer composites with appropriate crosslinking presents a viable strategy for developing advanced vascular graft materials.
    • Chitosan and elastin incorporation enhances mechanical integrity, while genipin crosslinking promotes better biological performance for vascular graft applications.