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Straining mode-dependent collagen remodeling in engineered cardiovascular tissue.

Mirjam P Rubbens1, Anita Mol, Mieke H van Marion

  • 1Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands. m.p.rubbens@tue.nl

Tissue Engineering. Part A
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Summary

Mechanical conditioning of engineered tissues impacts extracellular matrix remodeling. Dynamic straining enhances tissue quality by improving collagen cross-linking and glycosaminoglycan production, crucial for cardiovascular tissue engineering.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cardiovascular Research

Background:

  • Engineered cardiovascular construct mechanical properties rely on extracellular matrix (ECM) quality.
  • ECM remodeling is key to improving mechanical function in engineered tissues.
  • Mechanical conditioning protocols can enhance tissue remodeling and properties.

Purpose of the Study:

  • To investigate the hypothesis that tissue remodeling depends on the mode of straining.
  • To quantify the effects of static versus dynamic straining on tissue remodeling indices.
  • To elucidate strain mode-dependent effects on matrix composition, maturity, and remodeling markers.

Main Methods:

  • Quantified differences in collagen and glycosaminoglycans (GAGs) composition over time.
  • Assessed collagen cross-link expression and density.
  • Measured gene expression, protein levels, and secretion of remodeling markers (MMP-1, P1NP, ICTP).

Main Results:

  • Static strain increased collagen gene expression and production.
  • Dynamic straining led to lower collagen production but enhanced collagen cross-linking and GAG production.
  • Dynamic straining stimulated collagen remodeling processes, indicated by increased remodeling markers.

Conclusions:

  • Dynamic straining enhances neotissue quality by improving collagen cross-linking and GAG production, despite lower collagen output.
  • Strain mode-dependent remodeling responses enable fine-tuning of tissue mechanical properties.
  • Optimized mechanical conditioning protocols are vital for overcoming limitations in cardiovascular tissue engineering.