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Self-Cross-Linking p(APM-co-AA) Microstructured Thin Films as Biomimetic Scaffolds.

Christal Zhou1, Jing Zhao1, Sokunthearath Saem1

  • 1Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada.

ACS Applied Bio Materials
|January 8, 2022
PubMed
Summary

Researchers developed a novel synthetic polyampholyte scaffold, p(APM-co-AA), that mimics the 3D extracellular matrix. This biomimetic scaffold allows tunable surface chemistry and topography to study cell behavior, offering new insights into cell-microenvironment interactions.

Keywords:
benchtopbucklingcellular microenvironmentextracellular matrixfabricationpolyampholyteshape-memory polymerthermal cross-linkingtissue engineering

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Polymer Chemistry

Background:

  • Cells naturally exist within a 3D extracellular matrix (ECM) that provides critical environmental cues.
  • Traditional 2D in vitro cell culture models poorly replicate the complex 3D microenvironment of natural tissues.
  • Developing biomimetic scaffolds is crucial for accurate in vitro studies of cell development and behavior.

Purpose of the Study:

  • To create a tunable, self-cross-linking synthetic polyampholyte scaffold that mimics the 3D extracellular matrix.
  • To investigate the effects of scaffold surface chemistry and topography on fibroblast cell behavior.
  • To establish a new platform for studying cell-material interactions in a 3D context.

Main Methods:

  • Synthesized a polyampholyte, p(APM-co-AA) [poly(N-(3-aminopropyl)methacrylamide hydrochloride-co-acrylic acid)].
  • Coated the polyampholyte onto prestressed polystyrene films, inducing self-cross-linking and 3D wrinkling upon thermal shrinkage.
  • Characterized scaffold properties using ATR-IR, assessed cell viability, and modified surface chemistry with different amines.

Main Results:

  • Successfully fabricated self-cross-linked, wrinkled 3D polyampholyte scaffolds with tunable topography and surface chemistry.
  • Demonstrated non-cytotoxicity of the scaffolds and tunable fibroblast attachment/spreading based on surface functionalization.
  • Showed that scaffold topography significantly influences fibroblast morphology, including cell boundaries, area, and circularity.

Conclusions:

  • The tunable, self-cross-linking p(APM-co-AA) system provides a versatile platform for creating biomimetic 3D scaffolds.
  • These scaffolds enable detailed investigation into how surface chemistry and topography impact cell behavior.
  • This work contributes a novel biomimetic scaffold for advanced cell culture and tissue engineering research.