Remodeling of engineered tissue anisotropy in response to altered loading conditions

Eun Jung Lee, Jeffrey W. Holmes, Kevin D. Costa

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Structural and mechanical anisotropy are critical to the function of many engineered tissues. This study examined the ability of anisotropic tissue constructs to overcome contact guidance cues and remodel in response to altered mechanical loading conditions. Square tissues engineered from dermal fibroblasts and type-I collagen were uniaxially loaded to induce cell and matrix alignment. After an initial time, t*, of 5-72 h, loading was switched from the x-axis to the y-axis. Cell alignment was examined throughout the experiment until a steady state was reached. Before t*, cells spontaneously aligned in the x-direction. After t*, the strength of alignment transiently decreased then increased, and mean cell orientation transitioned from the x- to the y-direction following an exponential time course with a time constant that increased with t*. Collagen fiber orientation exhibited similar trends that could not be explained by passive kinematics alone. Structural realignment resulted in concomitant changes in biaxial tissue mechanical properties. The findings suggest that even highly aligned engineered tissue constructs retain the capacity to remodel in response to altered mechanical stimuli. This may have important functional consequences when an anisotropic engineered tissue designed in vitro is surgically implanted into a mechanically complex graft site.

Original languageEnglish (US)
Pages (from-to)1322-1334
Number of pages13
JournalAnnals of Biomedical Engineering
Volume36
Issue number8
DOIs
StatePublished - Aug 1 2008
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering

Keywords

  • Biaxial
  • Biomechanics
  • Collagen
  • Contact guidance
  • Fibroblast

Cite this