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Tissue-engineered heart valves develop native-like collagen fiber architecture.

Martijn A J Cox1, Jeroen Kortsmit, Niels Driessen

  • 1Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, WH4.107, The Netherlands. m.a.j.cox@tue.nl

Tissue Engineering. Part A
|December 17, 2009
PubMed
Summary

Mechanical conditioning in bioreactors helps engineer heart valves with native-like tissue architecture. This approach is crucial for developing functional, tissue-engineered heart valves that mimic natural structures.

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Area of Science:

  • Biomedical Engineering
  • Tissue Engineering
  • Cardiovascular Research

Background:

  • Creating autologous heart valves with native biomechanical properties is a significant challenge in tissue engineering.
  • Mimicking in vitro diastolic loading in a bioreactor shows promise for developing native-like tissue structures.
  • Previous studies indicate engineered heart valves possess sufficient strength for systemic pressures.

Purpose of the Study:

  • To link the global functioning of engineered heart valves to their native-like fiber architecture developed through in vitro diastolic loading.
  • To investigate the hypothesis that increased loading magnitude during in vitro culture enhances collagen fiber alignment.
  • To evaluate the impact of in vitro mechanical conditioning on the development of tissue-engineered heart valve structure and mechanics.

Main Methods:

  • Engineered heart valves (n=10) were cultured using varied in vitro diastolic loading protocols.
  • Local fiber distribution and mechanics were assessed using an inverse numerical-experimental approach.
  • Confocal imaging combined with indentation tests, including comparison with native ovine heart valves.

Main Results:

  • In vitro mechanical conditioning promoted the development of native-like local fiber architecture across all tested loading protocols.
  • The effect of loading magnitude on fiber alignment was minimal within the tested range.
  • Engineered heart valve fibers exhibited significantly stiffer mechanical properties compared to native valves.

Conclusions:

  • In vitro mechanical conditioning is vital for inducing native-like tissue architecture in engineered heart valves.
  • The study confirms the importance of mimicking physiological loading for functional heart valve tissue engineering.
  • Further research is needed to optimize loading protocols for achieving native-like mechanical properties.