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Updated: May 28, 2025

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Polyacrylamide-Based Hydrogel with Biocompatibility and Tunable Stiffness for Three-Dimensional Cell Culture.

Yi Wang1,2, Rui Zhang1, Ziwen Qiao1

  • 1Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China.

ACS Applied Bio Materials
|February 14, 2025
PubMed
Summary

Researchers developed non-toxic polyacrylamide (PAAm) hydrogels for 3D cell culture, enabling the separation of biological functions from mechanical properties. These tunable PAAm hydrogels support cell viability and organoid development.

Keywords:
3D cell culturePolyacrylamideRAFT polymerizationhydrogelthiol-norbornene coupling

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Three-dimensional (3D) cell culture offers greater physiological relevance than 2D models.
  • Existing 3D platforms like Matrigel struggle to decouple biological functions from mechanical properties.
  • Polyacrylamide (PAAm) is suitable for 2D culture but its precursor, acrylamide (AAm), is cytotoxic, hindering 3D applications.

Purpose of the Study:

  • To synthesize non-toxic PAAm hydrogels for 3D cell culture.
  • To create a platform allowing independent tuning of biological and mechanical properties.
  • To evaluate the biocompatibility and utility of PAAm hydrogels in supporting cell and organoid 3D culture.

Main Methods:

  • RAFT copolymerization of AAm with a functional monomer, followed by post-polymerization modification to introduce thiol or norbornene groups.
  • Fabrication of PAAm hydrogels via photoinduced thiol-norbornene coupling.
  • 3D culture of human umbilical vein endothelial cells (HUVECs) and intestinal organoids.

Main Results:

  • Synthesized non-toxic, linear PAAm with tunable chain lengths and functional groups (multithiol or multinorbornene).
  • Fabricated biocompatible, structurally homogeneous PAAm hydrogels with tunable and reproducible mechanical properties.
  • Demonstrated successful 3D culture of HUVECs, with higher adhesive ligand density improving viability.
  • Showed favorable results for intestinal organoid culture in combination with Matrigel, indicating lower mechanical strength is beneficial.

Conclusions:

  • Developed a novel, non-toxic PAAm hydrogel system for 3D cell culture.
  • This platform enables the decoupling of biological functions and mechanical properties in 3D environments.
  • The PAAm hydrogels show significant potential for advanced 3D cell culture applications, including organoid development.