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Dynamic modulation of small-sized multicellular clusters using a cell-friendly photoresist.

Jong-Cheol Choi1, Hong-Ryul Jung, Junsang Doh

  • 1Department of Mechanical Engineering, ‡School of Interdisciplinary Bioscience and Bioengineering (I-Bio), Pohang University of Science and Technology , San31, Hyoja-dong, Nam-Gu, Pohang, Gyeongbuk, 790-784, Korea.

ACS Applied Materials & Interfaces
|November 22, 2013
PubMed
Summary

Researchers developed a novel micropatterning technique to precisely control cell cluster size and geometry. This method revealed that small multicellular clusters exhibit size-dependent collective migration behaviors, with smaller groups forming single leaders for coordinated movement.

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Area of Science:

  • Cell biology
  • Biophysics
  • Developmental biology

Background:

  • Multicellular cluster dynamics are crucial for embryonic development and cancer metastasis.
  • Existing methods lack precise control over cell numbers in fabricated clusters, impacting studies of small cell groups.

Purpose of the Study:

  • To develop a new method for fabricating multicellular clusters with precise control over cell number, composition, and geometry.
  • To investigate the effects of cluster size and geometry on the motility behaviors of small multicellular clusters.

Main Methods:

  • Utilized dynamic cell micropatterning with a cell-friendly photoresist film via multistep microscope projection photolithography.
  • Fabricated single cell arrays and merged neighboring cells to create precisely controlled multicellular clusters.
  • Generated Madin-Darby canine kidney cell clusters of various sizes and initial geometries for motility analysis.

Main Results:

  • Small multicellular cluster behavior is determined by dynamic force balances, not initial configurations.
  • Initially rounded clusters showed minimal translocation due to peripheral contractility.
  • 2-cell and 4-cell clusters developed single leaders and exhibited coherent, supercell-like migration.
  • 8-cell clusters did not display this coherent behavior, suggesting a critical size for single-leader-driven migration.

Conclusions:

  • The developed micropatterning method enables precise fabrication of multicellular clusters for studying collective dynamics.
  • A critical group size may exist for the emergence of single-leader-driven coherent migration in small cell clusters.
  • Findings offer insights into collective cell migration relevant to development and disease.