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Cardiac tissue engineering: cell seeding, cultivation parameters, and tissue construct characterization.

R L Carrier1, M Papadaki, M Rupnick

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusettes, USA.

Biotechnology and Bioengineering
|July 15, 1999
PubMed
Summary
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This study optimized cardiac tissue engineering by comparing cell sources, seeding densities, and culture conditions. High-density seeding in rotating vessels improved cell viability and efficiency for functional engineered cardiac muscle.

Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Cardiovascular Research

Background:

  • Cardiac tissue engineering aims to create functional tissue for repair and study.
  • Previous work established contractile cell-polymer constructs using cells, scaffolds, and bioreactors.

Purpose of the Study:

  • To investigate the impact of cell source, seeding density, and vessel type on engineered cardiac muscle.
  • To optimize conditions for structural integrity, cell viability, and metabolic function.

Main Methods:

  • Compared neonatal rat and embryonic chick cells.
  • Evaluated effects of initial cell seeding density and vessel conditions (mixed flasks vs. rotating vessels).
  • Assessed structural integrity, cell damage (LDH levels), cellularity, metabolism, and cell morphology.

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Main Results:

  • High-density seeding (6-8x10^6 cells/scaffold) with rat cells yielded contractile constructs.
  • Rotating vessels (laminar flow) improved seeding efficiency (23%) and reduced cell damage (20%) compared to mixed flasks (turbulent flow).
  • Mixed culture conditions enhanced cellularity (2-4x), aerobic metabolism, and cell shape; rotating bioreactors promoted more active aerobic metabolism.

Conclusions:

  • Optimized seeding and culture conditions are crucial for developing functional engineered cardiac muscle.
  • Rotating bioreactors offer advantages for cell metabolism and viability in cardiac tissue engineering.
  • Engineered tissues exhibit cardiac-specific features and comparable metabolic activity per cell to native tissue.