Molecularly engineered p(HEMA)-based hydrogels for implant biochip biocompatibility

Sheena Abraham, Sean Brahim, Kazuhiko Ishihara, Anthony Guiseppi-Elie

Research output: Contribution to journalArticle

150 Scopus citations

Abstract

The strategy of phospholipid-based biomimicry has been used to molecularly engineer poly(2-hydroxyethyl methacrylate) [p(HEMA)]-based hydrogels for improved in vitro and potential in vivo biocompatibility. Two methacrylate-based monomers, poly(ethylene glycol) (200) monomethacrylate (PEGMA) and 2-methacryloyloxyethyl phosphorylcholine (MPC), were incorporated at varying mole fractions of 0.0-0.5 mol% PEGMA and 0-10 mol% MPC respectively, into 3 mol% tetraethyleneglycol diacrylate (TEGDA) cross-linked p(HEMA) networks. Upon hydration of these engineered hydrogels, a reduction in receding contact angle from 22±1.2°for p(HEMA) to 8±2.7°for p(HEMA) containing 0.5:10 mol% PEGMA:MPC was observed, reflecting the significant increase in surface hydrophilicity with increasing PEGMA and MPC content upon prolonged hydration. Hydrogels containing MPC showed a temporal increase in hydrophilicity following continuous immersion in DI water over 5 days. Hydrogels containing 0.5 mol% PEGMA and MPC in the range of 5-10 mol% displayed reduced protein adsorption when incubated with the common extracellular matrix proteins; fibronectin, collagen or laminin, producing up to 64% less protein adsorption compared to p(HEMA). Compositional optima for cell viability and proliferation established from two-factor Central Composite design analysis of human muscle fibroblasts cultured on these hydrogels suggest that those containing PEGMA between 0.3 and 0.5 mol% and MPC levels around 5-10 mol% exhibit desirable characteristics for implant material coatings - high viability (>80%) with low proliferation (<40%), confirming a lack of cytotoxicity.

Original languageEnglish (US)
Pages (from-to)4767-4778
Number of pages12
JournalBiomaterials
Volume26
Issue number23
DOIs
StatePublished - Aug 2005

Keywords

  • Biocompatibility
  • Human muscle fibroblasts
  • Phosphorylcholine
  • Polyethylene glycol
  • Protein absorption
  • Wettability
  • p(HEMA) hydrogels

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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