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Antioxidant cerium oxide nanoparticle hydrogels for cellular encapsulation.

Jessica D Weaver1, Cherie L Stabler2

  • 1Department of Biomedical Engineering, College of Engineering, University of Miami, Coral Gables, FL 33146, USA; Diabetes Research Institute, Miller School of Medicine, University of Miami, Miami, FL 33136, USA.

Acta Biomaterialia
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Keywords:
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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Cellular Transplantation

Background:

  • Oxidative stress and free radicals cause toxicity and graft loss in cellular transplantation.
  • Existing antioxidant strategies may be limited in duration or efficacy.

Purpose of the Study:

  • To engineer an auto-catalytic, antioxidant, self-renewing cerium oxide nanoparticle (CONP)-composite hydrogel.
  • To evaluate the potential of this nanocomposite hydrogel to protect encapsulated beta cells in transplantation.

Main Methods:

  • Developed a composite hydrogel embedding cerium oxide nanoparticles (CONPs).
  • Assessed the antioxidant capacity and cytoprotective effects of CONPs and the composite hydrogel.
  • Evaluated the impact of free CONPs versus embedded CONPs on encapsulated beta cell viability.

Main Results:

  • Free CONPs showed antioxidant protection but caused cytotoxicity via phagocytosis at 1mM.
  • CONPs embedded in alginate hydrogels provided robust cytoprotection to encapsulated beta cells.
  • The composite hydrogel demonstrated no cytotoxicity up to 10mM, offering sustained free radical scavenging.

Conclusions:

  • Engineered CONP-composite hydrogel provides localized, sustained antioxidant protection for cellular transplantation.
  • This biomaterial overcomes the cytotoxicity issue of free nanoparticles, enhancing cell survival and graft potential.
  • The self-renewing, enzyme-mimetic nature of the hydrogel offers indefinite antioxidant defense.