Surface acoustic waves induced micropatterning of cells in gelatin methacryloyl (GelMA) hydrogels

Biofabrication. 2017 Feb 14;9(1):015020. doi: 10.1088/1758-5090/aa585e.

Abstract

Acoustic force patterning is an emerging technology that provides a platform to control the spatial location of cells in a rapid, accurate, yet contactless manner. However, very few studies have been reported on the usage of acoustic force patterning for the rapid arrangement of biological objects, such as cells, in a three-dimensional (3D) environment. In this study, we report on a bio-acoustic force patterning technique, which uses surface acoustic waves (SAWs) for the rapid arrangement of cells within an extracellular matrix-based hydrogel such as gelatin methacryloyl (GelMA). A proof-of-principle was achieved through both simulations and experiments based on the in-house fabricated piezoelectric SAW transducers, which enabled us to explore the effects of various parameters on the performance of the built construct. The SAWs were applied in a fashion that generated standing SAWs (SSAWs) on the substrate, the energy of which subsequently was transferred into the gel, creating a rapid, and contactless alignment of the cells (<10 s, based on the experimental conditions). Following ultraviolet radiation induced photo-crosslinking of the cell encapsulated GelMA pre-polymer solution, the patterned cardiac cells readily spread after alignment in the GelMA hydrogel and demonstrated beating activity in 5-7 days. The described acoustic force assembly method can be utilized not only to control the spatial distribution of the cells inside a 3D construct, but can also preserve the viability and functionality of the patterned cells (e.g. beating rates of cardiac cells). This platform can be potentially employed in a diverse range of applications, whether it is for tissue engineering, in vitro cell studies, or creating 3D biomimetic tissue structures.

MeSH terms

  • Animals
  • Cell Culture Techniques / instrumentation
  • Cell Survival
  • Cells, Cultured
  • Gelatin / chemistry*
  • Hydrogels / chemistry*
  • Myocytes, Cardiac / cytology
  • Myocytes, Cardiac / metabolism
  • Polymers / chemistry
  • Rats
  • Sound*
  • Tissue Scaffolds / chemistry
  • Ultraviolet Rays

Substances

  • Hydrogels
  • Polymers
  • Gelatin