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Cellular responses to patterned poly(acrylic acid) brushes.

Ethan N Chiang1, Rong Dong, Christopher K Ober

  • 1Department of Chemistry and Chemical Biology, Baker Laboratories, Cornell University, Ithaca, New York 14853, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 12, 2011
PubMed
Summary
This summary is machine-generated.

Patterned poly(acrylic acid) (PAA) polymer brushes at the nanoscale promote cell adhesion by interacting with fibronectin and cell integrins. Adjusting brush thickness tunes this interaction, controlling cell membrane accumulation and activation.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Cell Biology

Background:

  • Previous studies on surface topography and cell adhesion used feature sizes larger than cells.
  • Poly(acrylic acid) (PAA) brushes were generally considered cell-repellent.
  • Understanding nanoscale surface effects on cell interactions is crucial for biomaterial design.

Purpose of the Study:

  • To investigate the impact of nanoscale surface chemistry and topography on cell-surface interactions.
  • To explore the role of patterned poly(acrylic acid) (PAA) brushes in mediating cell adhesion.
  • To determine how PAA brush thickness influences cell adhesion and membrane dynamics.

Main Methods:

  • Fabrication of patterned poly(acrylic acid) (PAA) polymer brushes on silicon surfaces with varying feature sizes.
  • Incubation of RBL mast cells on these patterned surfaces.
  • Analysis of cell adhesion, fibronectin adsorption, and plasma membrane accumulation within the brushes.
  • Modification of brushes with specific ligands to control cell activation.

Main Results:

  • PAA brushes patterned at subcellular dimensions (15-30 nm thick) facilitated RBL mast cell adhesion.
  • Cell adhesion was mediated by fibronectin adsorption to PAA brushes and subsequent engagement of cell integrins.
  • Decreasing PAA brush thickness allowed for 'tuning' of cell adhesion and reduced membrane accumulation.
  • Patterned PAA brush arrays enabled spatial control of mast cell activation via ligand-specific engagement.

Conclusions:

  • Nanoscale patterning of PAA brushes can transform them from repellent to adhesive surfaces.
  • Fibronectin and cell integrins play a key role in PAA brush-mediated cell adhesion.
  • PAA brush thickness is a critical parameter for controlling cell adhesion and membrane dynamics.
  • Patterned PAA brushes offer a platform for precise control over cell adhesion and activation.