Nanostructured hybrid hydrogels prepared by a combination of atom transfer radical polymerization and free radical polymerization

Sidi A. Bencherif, Daniel J. Siegwart, Abiraman Srinivasan, Ferenc Horkay, Jeffrey O. Hollinger, Newell R. Washburn, Krzysztof Matyjaszewski

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

A new method to prepare nanostructured hybrid hydrogels by incorporating well-defined poly(oligo (ethylene oxide) monomethyl ether methacrylate) (POEO300MA) nanogels of sizes 110-120 nm into a larger three-dimensional (3D) matrix was developed for drug delivery scaffolds for tissue engineering applications. Rhodamine B isothiocyanate-labeled dextran (RITC-Dx) or fluorescein isothiocyanate-labeled dextran (FITC-Dx)-loaded POEO300MA nanogels with pendant hydroxyl groups were prepared by activators generated electron transfer atom transfer radical polymerization (AGET ATRP) in cyclohexane inverse miniemulsion. Hydroxyl-containing nanogels were functionalized with methacrylated groups to generate photoreactive nanospheres. 1H NMR spectroscopy confirmed that polymerizable nanogels were successfully incorporated covalently into 3D hyaluronic acid-glycidyl methacrylate (HAGM) hydrogels after free radical photopolymerization (FRP). The introduction of disulfide moieties into the polymerizable groups resulted in a controlled release of nanogels from cross-linked HAGM hydrogels under a reducing environment. The effect of gel hybridization on the macroscopic properties (swelling and mechanics) was studied. It is shown that swelling and nanogel content are independent of scaffold mechanics. In-vitro assays showed the nanostructured hybrid hydrogels were cytocompatible and the GRGDS (Gly-Arg-Gly-Asp-Ser) contained in the nanogel structure promoted cell-substrate interactions within 4 days of incubation. These nanostructured hydrogels have potential as an artificial extracellular matrix (ECM) impermeable to low molecular weight biomolecules and with controlled pharmaceutical release capability. Moreover, the nanogels can control drug or biomolecule delivery, while hyaluronic acid based-hydrogels can act as a macroscopic scaffold for tissue regeneration and regulator for nanogel release.

Original languageEnglish (US)
Pages (from-to)5270-5278
Number of pages9
JournalBiomaterials
Volume30
Issue number29
DOIs
StatePublished - Oct 2009

Fingerprint

Hydrogels
Atom transfer radical polymerization
Free radical polymerization
Polymerization
Free Radicals
Hyaluronic acid
glycyl-arginyl-glycyl-aspartyl-serine
Dextran
Biomolecules
Hyaluronic Acid
Scaffolds
Swelling
Mechanics
Dextrans
Hydroxyl Radical
Tissue regeneration
Photopolymerization
Nanospheres
Scaffolds (biology)
Cyclohexane

Keywords

  • Atom transfer radical polymerization (ATRP)
  • Free radical photopolymerization (FRP)
  • Hyaluronic acid
  • Hybrid
  • Hydrogels
  • Nanogels

ASJC Scopus subject areas

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

Cite this

Nanostructured hybrid hydrogels prepared by a combination of atom transfer radical polymerization and free radical polymerization. / Bencherif, Sidi A.; Siegwart, Daniel J.; Srinivasan, Abiraman; Horkay, Ferenc; Hollinger, Jeffrey O.; Washburn, Newell R.; Matyjaszewski, Krzysztof.

In: Biomaterials, Vol. 30, No. 29, 10.2009, p. 5270-5278.

Research output: Contribution to journalArticle

Bencherif, Sidi A. ; Siegwart, Daniel J. ; Srinivasan, Abiraman ; Horkay, Ferenc ; Hollinger, Jeffrey O. ; Washburn, Newell R. ; Matyjaszewski, Krzysztof. / Nanostructured hybrid hydrogels prepared by a combination of atom transfer radical polymerization and free radical polymerization. In: Biomaterials. 2009 ; Vol. 30, No. 29. pp. 5270-5278.
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