Silver-releasing bioactive glass nanoparticles for infected tissue regeneration

Natalia Pajares-Chamorro; Sandra Hernández-Escobar; Yadav Wagley; Parker Acevedo; Madeline Cramer; Stephen Badylak; Neal D Hammer; Jonathan Hardy; Kurt Hankenson; Xanthippi Chatzistavrou

doi:10.1016/j.bioadv.2023.213656

Silver-releasing bioactive glass nanoparticles for infected tissue regeneration

Biomater Adv. 2023 Nov:154:213656. doi: 10.1016/j.bioadv.2023.213656. Epub 2023 Oct 9.

Affiliations

¹ Department of Chemical Engineering and Material Science, College of Engineering, Michigan State University, East Lansing, MI 48824, USA.
² Department of Orthopaedic Surgery, University of Michigan Medical School, Ann Arbor, MI 48103, USA.
³ McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
⁴ Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA.
⁵ Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA; Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI 48824, USA.
⁶ Department of Chemical Engineering and Material Science, College of Engineering, Michigan State University, East Lansing, MI 48824, USA; Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece. Electronic address: chatzist@msu.edu.

PMID: 37844416
DOI: 10.1016/j.bioadv.2023.213656

Abstract

Bacterial infections represent a formidable challenge, often leaving behind significant bone defects post-debridement and necessitating prolonged antibiotic treatments. The rise of antibiotic-resistant bacterial strains further complicates infection management. Bioactive glass nanoparticles have been presented as a promising substitute for bone defects and as carriers for therapeutic agents against microorganisms. Achieving consistent incorporation of ions into BGNs has proven challenging and restricted to a maximum ion concentration, especially when reducing the particle size. This study presents a notable achievement in the synthesis of 10 nm-sized Ag-doped bioactive glass nanoparticles (Ag-BGNs) using a modified yet straightforward Stöber method. The successful incorporation of essential elements, including P, Ca, Al, and Ag, into the glass structure at the intended concentrations (i.e., CaO wt% above 20 %) was confirmed by EDS, signifying a significant advancement in nanoscale biomaterial engineering. While exhibiting a spherical morphology and moderate dispersity, these nanoparticles tend to form submicron-sized aggregates outside of a solution state. The antibacterial effectiveness against MRSA was established across various experimental conditions, with Ag-BGNs effectively sterilizing planktonic bacteria without the need for antibiotics. Remarkably, when combined with oxacillin or fosfomycin, Ag-BGNs demonstrated a potent synergistic effect, restoring antibacterial capabilities against MRSA strains resistant to these antibiotics when used alone. Ag-BGNs exhibited potential in promoting human mesenchymal stromal cell proliferation, inducing the upregulation of osteoblast gene markers, and significantly contributing to bone regeneration in mice. This innovative synthesis protocol holds substantial promise for the development of biomaterials dedicated to the regeneration of infected tissue.

Keywords: Bioactive glass nanoparticles; Biofilm; Bone regeneration; Macrophage; Silver; Stöber method.

MeSH terms

Animals
Anti-Bacterial Agents / chemistry
Anti-Bacterial Agents / pharmacology
Anti-Bacterial Agents / therapeutic use
Bacteria
Biocompatible Materials / pharmacology
Bone Regeneration
Humans
Mice
Nanoparticles* / chemistry
Nanoparticles* / therapeutic use
Silver* / pharmacology
Wound Healing

Substances

Silver
Biocompatible Materials
Anti-Bacterial Agents