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Stable biochemically micro-patterned hydrogel layers control specific cell adhesion and allow long term cyclic

Alexandra M Greiner1, Peter Hoffmann, Kristina Bruellhoff

  • 1Department of Cell- and Neurobiology, Karlsruhe Institute of Technology (KIT, ), Institute of Zoology, Haid-und-Neu-Str. 9, 76131, Karlsruhe, Germany.

Macromolecular Bioscience
|August 8, 2014
PubMed
Summary

This study demonstrates that ultrathin hydrogel coatings on poly(dimethylsiloxane) maintain cell-repellent properties and bioactive fibronectin patterns under mechanical strain. This enables controlled cell adhesion for applications in tissue engineering and wound healing.

Keywords:
hydrogelsmechanical propertiesmicro-contact printing of fibronectinspecific cell adhesionspin coating of star polymersuniaxial cyclic tensile strain

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Surface Chemistry

Background:

  • Poly(dimethylsiloxane) (PDMS) is widely used in biomedical applications but suffers from non-specific protein and cell adhesion.
  • Developing functionalized surfaces that control cell interactions is crucial for advanced tissue engineering and regenerative medicine.

Purpose of the Study:

  • To create a stable, bioactive surface on PDMS by covalently coating it with NCO-terminated poly(ethylene oxide-stat-propylene oxide) (NCO-sP(EO-stat-PO)) hydrogels.
  • To investigate the long-term stability and bioactivity of covalently bound fibronectin (FN) patterns under cyclic tensile strain (CTS).
  • To evaluate the adhesion and behavior of human dermal fibroblasts (HDFs) on these functionalized surfaces.

Main Methods:

  • Covalent coating of PDMS with ultrathin NCO-sP(EO-stat-PO) hydrogel layers.
  • Covalent immobilization of fibronectin (FN) in a line pattern on the hydrogel surface.
  • Application of long-term uniaxial cyclic tensile strain (CTS) to the coated surfaces.
  • Assessment of protein and cell repellency of the hydrogel coating.
  • Studying human dermal fibroblast (HDF) adhesion, morphology, and actin cytoskeleton organization on FN-patterned surfaces.

Main Results:

  • The NCO-sP(EO-stat-PO) hydrogel coating preserved its protein and cell-repellent properties after long-term CTS.
  • The covalently bound fibronectin (FN) line pattern remained stable and bioactive under CTS.
  • Human dermal fibroblasts (HDFs) adhered specifically to the FN lines and oriented their cell bodies and actin fibers along these patterns, irrespective of CTS direction.

Conclusions:

  • Ultrathin NCO-sP(EO-stat-PO) hydrogel coatings provide a stable, bioactive surface on PDMS that resists non-specific cell adhesion while allowing controlled cell attachment to immobilized ligands like FN.
  • The demonstrated mechanical stability of the patterned bioactive surface is critical for understanding biomechanical stimuli in cellular signaling and for applications in tissue engineering, wound healing, and implant development requiring precise control over cell adhesion.