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Recreating the heart's helical structure-function relationship with focused rotary jet spinning.

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Helical muscle alignment in engineered heart ventricles improves pumping efficiency. Focused rotary jet spinning (FRJS) fabricates these complex 3D structures, advancing tissue engineering for cardiac repair.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Tissue Engineering

Background:

  • Cardiac muscle's helical alignment is theorized to optimize heart pumping.
  • Replicating the heart's complex microarchitecture is a significant challenge in tissue engineering.

Purpose of the Study:

  • To investigate the functional impact of helical vs. circumferential muscle alignment in engineered cardiac ventricles.
  • To introduce focused rotary jet spinning (FRJS) as a method for fabricating 3D micro/nanofiber scaffolds with controlled alignments.

Main Methods:

  • Focused rotary jet spinning (FRJS) was used to create 3D scaffolds with programmable fiber alignments.
  • Cardiomyocytes were seeded onto scaffolds to biofabricate tissue-engineered ventricles.
  • Engineered ventricles with helical and circumferential alignments were compared for cardiac function.

Main Results:

  • Helically aligned engineered ventricles exhibited more uniform deformations.
  • Greater apical shortening and increased ejection fractions were observed in helically aligned models.
  • FRJS demonstrated effective control over fiber arrangement in complex 3D geometries.

Conclusions:

  • Helical muscle architecture significantly enhances cardiac performance in engineered ventricles.
  • FRJS provides a streamlined approach for fabricating functional tissue-engineered organs.
  • This study validates the importance of helical structures for efficient cardiac function.