Modeling the impact of scaffold architecture and m

Authors: G Argento N de Jonge S H M Söntjens C W J Oomens C V C Bouten F P T Baaijens

Publish Date: 2014/10/16

Volume: 14, Issue: 3, Pages: 603-613

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Abstract

The anisotropic collagen architecture of an engineered cardiovascular tissue has a major impact on its in vivo mechanical performance This evolving collagen architecture is determined by initial scaffold microstructure and mechanical loading Here we developed and validated a theoretical and computational microscale model to quantitatively understand the interplay between scaffold architecture and mechanical loading on collagen synthesis and degradation Using input from experimental studies we hypothesize that both the microstructure of the scaffold and the loading conditions influence collagen turnover The evaluation of the mechanical and topological properties of in vitro engineered constructs reveals that the formation of extracellular matrix layers on top of the scaffold surface influences the mechanical anisotropy on the construct Results show that the microscale model can successfully capture the collagen arrangement between the fibers of an electrospun scaffold under static and cyclic loading conditions Contact guidance by the scaffold and not applied load dominates the collagen architecture Therefore when the collagen grows inside the pores of the scaffold pronounced scaffold anisotropy guarantees the development of a construct that mimics the mechanical anisotropy of the native cardiovascular tissueThis research forms part of the Project P101 iValve of the research program of the BioMedical Materials institute cofunded by the Dutch Ministry of Economic Affairs The financial contribution of the Nederlandse Hartstichting is gratefully acknowledged The authors gratefully thank Marc Simonet for the electrospinning of the scaffolds

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