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Micro-mold design controls the 3D morphological evolution of self-assembling multicellular microtissues.

Alexander A Svoronos1, Nalin Tejavibulya, Jacquelyn Y Schell

  • 11 Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University , Providence, Rhode Island.

Tissue Engineering. Part A
|October 24, 2013
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Researchers explored how micro-mold design influences self-organizing 3D multicellular microtissues. Mold features like shape and obstacles control tissue tension, morphology, and rupture points, enabling precise tissue engineering models.

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Area of Science:

  • Biomaterials Science
  • Cellular Mechanics
  • Tissue Engineering

Background:

  • Cells self-assemble into 3D microtissues using cytoskeletal contraction and cell-cell adhesion within micro-molds.
  • Microtissue size and shape are determined by cell type and micro-mold geometry.

Purpose of the Study:

  • Investigate how micro-mold design elements guide the morphological changes during 3D tissue self-organization.
  • Understand the relationship between mold design, cellular tension, and resulting tissue morphology.

Main Methods:

  • Utilized human fibroblasts seeded into nonadhesive micro-molds with varying designs (e.g., dogbone, interconnected toroids, honeycomb).
  • Analyzed tissue self-assembly, tension-induced morphological changes, and rupture points.
  • Investigated the effect of transforming growth factor-β1 on cell contraction and tissue stability.

Main Results:

  • Dogbone mold experiments showed that increasing connecting rod width enhanced stability, while increasing length decreased it.
  • Rupture points in dogbone tissues were mapped and found to be controlled by cell volume distribution.
  • Obstacle design in complex molds regulated tension and morphology; cone-shaped posts acted as tension modulators.

Conclusions:

  • Micro-mold design is a critical factor in controlling the morphology and stability of self-organizing 3D multicellular microtissues.
  • Understanding these design principles allows for the creation of improved models for organogenesis studies and 3D cell mechanics.
  • This knowledge facilitates the fabrication of building components for advanced tissue engineering applications.