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Self-Assembled Hexagonal Superparamagnetic Cone Structures for Fabrication of Cell Cluster Arrays.

Yinling Chen1,2, Zhixin Hu1, Dongyang Zhao1

  • 1School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China.

ACS Applied Materials & Interfaces
|March 1, 2021
PubMed
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Researchers created hexagonal superparamagnetic cone arrays to self-assemble cell clusters. These structures effectively capture and arrange magnetically labeled glioblastoma cells, controlling their growth and migration via magnetic field gradients.

Area of Science:

  • Biomaterials Engineering
  • Nanotechnology
  • Cell Biology

Background:

  • Fabricating ordered cell structures is crucial for tissue engineering and biological studies.
  • Controlling cell arrangement and behavior requires precise microenvironmental manipulation.
  • Superparamagnetic materials offer tunable magnetic properties for remote manipulation.

Purpose of the Study:

  • To develop a method for fabricating ordered cell cluster arrays using self-assembled magnetic structures.
  • To investigate the capture efficiency and arrangement of magnetically labeled cells on these structures.
  • To explore the effect of local magnetic field gradients on cell growth and migration.

Main Methods:

  • Self-assembly of hexagonal superparamagnetic cone structures from ferrofluid under an external magnetic field.
Keywords:
cell clusters arrayferrofluidhexagonal superparamagnetic cone structuresself-assembled

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  • Dehydration and casting with polydimethylsiloxane to create stable solid cone arrays.
  • Magnetic labeling of U-343 human neuronal glioblastoma cells with magnetic nanoparticles.
  • Cell capture and arrangement on cone structures using magnetophoresis and analysis of cell behavior.

    • Main Results:

    • Hexagonal superparamagnetic cone arrays were successfully fabricated through controlled ferrofluid instability and self-assembly.
    • Magnetically labeled glioblastoma cells were efficiently captured and arranged into cluster arrays on the cone structures.
    • Cell capture increased with solid cone size (48 to 126 cells per cone) under a 2000 G field.
    • Local magnetic field gradients (117.0-140.9 G/mm) were observed, correlating with reduced cell edge protrusions, indicating restricted growth and migration.

    Conclusions:

    • Self-assembled hexagonal superparamagnetic cones provide a novel platform for creating ordered cell cluster arrays.
    • The magnetic properties of the cones enable precise manipulation and arrangement of magnetically labeled cells.
    • The generated local magnetic field gradients can effectively modulate cell behavior, offering potential for controlled cell culture and tissue engineering.