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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Tuning intercellular adhesion with membrane-anchored oligonucleotides.

Ian T Hoffecker1,2, Yusuke Arima1,3, Hiroo Iwata1,4

  • 1Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.

Journal of the Royal Society, Interface
|October 31, 2019
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Scientists created artificial cell-cell adhesion using DNA-lipid molecules, decoupling it from internal cell mechanics. This allows precise control over cell interactions for developmental biology and tissue engineering applications.

Keywords:
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Area of Science:

  • Biophysics
  • Cell Biology
  • Biomaterials Science

Background:

  • Cell-cell adhesion is crucial for development, differentiation, and regeneration.
  • Existing methods for controlling cell adhesion are limited by biological interdependencies, such as connections between cadherins and actomyosin forces.

Purpose of the Study:

  • To develop a method for artificial cell-cell adhesion largely independent of the cytoskeleton.
  • To establish a controllable system for tuning cell-cell adhesion strength.

Main Methods:

  • Utilized oligonucleotides conjugated to PEGylated lipid anchors (ssDNAPEGDPPE) to create artificial adhesion.
  • Employed a mechanical model of elastic sphere deformation to quantify cell-doublet adhesion.
  • Manipulated adhesion by altering the ratio of PEG-lipid to ssDNAPEGDPPE and using cytochalasin D.

Main Results:

  • Demonstrated successful decoupling of artificial adhesion from internal cell mechanics.
  • Showed that modulating the PEG-lipid to ssDNAPEGDPPE ratio precisely controls doublet contact area.
  • Observed that cytochalasin D treatment altered doublet contact area, confirming cytoskeletal influence on adhesion.

Conclusions:

  • The study provides a novel method for tuning basic cell-cell adhesion independent of protein expression.
  • The findings support models of tissue surface tension involving cortical and cohesive forces.
  • This work lays the groundwork for advanced control of multicellular adhesion in synthetic systems.