Using Multilayered Hydrogel Bioink in Three-Dimensional Bioprinting for Homogeneous Cell Distribution

J Vis Exp. 2020 May 2:(159). doi: 10.3791/60920.

Abstract

During the extrusion-based three-dimensional bioprinting process, liquid-like bioinks with low viscosity can protect cells from membrane damage induced by shear stress and improve the survival of the encapsulated cells. However, rapid gravity-driven cell sedimentation in the reservoir could lead to an inhomogeneous cell distribution in bioprinted structures and therefore hinder the application of liquid-like bioinks. Here, we developed a novel multilayered modified strategy for liquid-like bioinks (e.g., gelatin methacryloyl with low viscosity) to prevent the sedimentation of encapsulated cells. Multiple liquid interfaces were manipulated in the multilayered bioink to provide interfacial retention. Consequently, the cell sedimentation action going across adjacent layers in the multilayered system was retarded in the bioink reservoir. It was found that the interfacial retention was much higher than the sedimental pull of cells, demonstrating a critical role of the interfacial retention in preventing cell sedimentation and promoting a more homogeneous dispersion of cells in the multilayered bioink.

Publication types

  • Research Support, Non-U.S. Gov't
  • Video-Audio Media

MeSH terms

  • Animals
  • Biocompatible Materials / chemistry*
  • Bioprinting*
  • Cell Survival
  • Cells / metabolism*
  • Fibroins / chemistry
  • Gelatin / chemistry
  • Hydrogels / chemistry*
  • Ink*
  • Methacrylates / chemistry
  • Mice
  • NIH 3T3 Cells
  • Printing, Three-Dimensional*
  • Viscosity

Substances

  • Biocompatible Materials
  • Hydrogels
  • Methacrylates
  • Gelatin
  • Fibroins