Magnetic and radio-labeled bio-hybrid scaffolds to promote and track in vivo the progress of bone regeneration

Elisabetta Campodoni, Marisela Velez, Eirini Fragogeorgi, Irene Morales, Patricia De La Presa, Dimitri Stanicki, Samuele M. Dozio, Stavros Xanthopoulos, Penelope Bouziotis, Eleftheria Dermisiadou, Maritina Rouchota, George Loudos, Pilar Marín, Sophie Laurent, Sébastien Boutry, Silvia Panseri, Monica Montesi, Anna Tampieri, Monica Sandri

Research output: Contribution to journalArticlepeer-review

Abstract

This work describes the preparation, characterization and functionalization with magnetic nanoparticles of a bone tissue-mimetic scaffold composed of collagen and hydroxyapatite obtained through a biomineralization process. Bone remodeling takes place over several weeks and the possibility to follow it in vivo in a quick and reliable way is still an outstanding issue. Therefore, this work aims to produce an implantable material that can be followed in vivo during bone regeneration by using the existing non-invasive imaging techniques (MRI). To this aim, suitably designed biocompatible SPIONs were linked to the hybrid scaffold using two different strategies, one involving naked SPIONs (nMNPs) and the other using coated and activated SPIONs (MNPs) exposing carboxylic acid functions allowing a covalent attachment between MNPs and collagen molecules. Physico-chemical characterization was carried out to investigate the morphology, crystallinity and stability of the functionalized materials followed by MRI analyses and evaluation of a radiotracer uptake ([99mTc]Tc-MDP). Cell proliferation assays in vitro were carried out to check the cytotoxicity and demonstrated no side effects due to the SPIONs. The achieved results demonstrated that the naked and coated SPIONs are more homogeneously distributed in the scaffold when incorporated during the synthesis process. This work demonstrated a suitable approach to develop a biomaterial for bone regeneration that allows the monitoring of the healing progress even for long-term follow-up studies.

Original languageEnglish (US)
Pages (from-to)7575-7590
Number of pages16
JournalBiomaterials Science
Volume9
Issue number22
DOIs
StatePublished - Nov 21 2021

ASJC Scopus subject areas

  • Biomedical Engineering
  • Materials Science(all)

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