A multifunctional streptococcal collagen-mimetic protein coating prevents bacterial adhesion and promotes osteoid formation on titanium

Julianna K. Bronk, Brooke H. Russell, Jose J. Rivera, Renata Pasqualini, Wadih Arap, Magnus Höök, E. Magda Barbu

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

The major barriers to the clinical success of orthopedic and dental implants are poor integration of fixtures with bone tissue and biomaterial-associated infections. Although multifunctional device coatings have long been considered a promising strategy, their development is hindered by difficulties in integrating biocompatibility, anti-infective activity and antithrombotic properties within a single grafting agent. In this study, we used cell adhesion assays and confocal microscopy of primary murine osteoblasts and human osteoblast cell lines MG-63 and Saos-2 to demonstrate that a streptococcal collagen-like protein engineered to display the α1 and α2 integrin recognition sequences enhances osteoblast adhesion and spreading on titanium fixtures. By measuring calcium deposition and alkaline phosphatase activity, we also showed that selective activation of α2β1 integrin induces osteoblast differentiation, osteoid formation and mineralization. Moreover, cell adhesion assays and scanning electron microscopy of clinical isolates Staphylococcus aureus Philips and Staphylococcus epidermidis 9491 indicated that streptococcal collagen-mimetic proteins inhibit bacterial colonization and biofilm formation irrespective of their interaction with integrins. Given that streptococcal collagenous substrates neither interact with platelets nor trigger a strong immune response, this novel bioactive coating appears to have desirable multifaceted properties with promising translational applications.

Original languageEnglish (US)
Pages (from-to)3354-3362
Number of pages9
JournalActa Biomaterialia
Volume10
Issue number7
DOIs
StatePublished - Jul 2014

Keywords

  • Biofilm
  • Osseointegration
  • Streptococcal collagen mimetic proteins
  • Titanium implants

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Biomaterials

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