Stimulation of Human Osteoblast Differentiation in Magneto-Mechanically Actuated Ferromagnetic Fiber Networks

Galit Katarivas Levy, Mark A Birch, Roger A Brooks, Suresh Neelakantan, Athina E Markaki

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

There is currently an interest in "active" implantable biomedical devices that include mechanical stimulation as an integral part of their design. This paper reports the experimental use of a porous scaffold made of interconnected networks of slender ferromagnetic fibers that can be actuated in vivo by an external magnetic field applying strains to in-growing cells. Such scaffolds have been previously characterized in terms of their mechanical and cellular responses. In this study, it is shown that the shape changes induced in the scaffolds can be used to promote osteogenesis in vitro. In particular, immunofluorescence, gene and protein analyses reveal that the actuated networks exhibit higher mineralization and extracellular matrix production, and express higher levels of osteocalcin, alkaline phosphatase, collagen type 1α1, runt-related transcription factor 2 and bone morphogenetic protein 2 than the static controls at the 3-week time point. The results suggest that the cells filling the inter-fiber spaces are able to sense and react to the magneto-mechanically induced strains facilitating osteogenic differentiation and maturation. This work provides evidence in support of using this approach to stimulate bone ingrowth around a device implanted in bone and can pave the way for further applications in bone tissue engineering.

Original languageEnglish GB
Article number1522
JournalJournal of Clinical Medicine
Volume8
Issue number10
DOIs
StatePublished - 22 Sep 2019
Externally publishedYes

Keywords

  • Fiber networks
  • Human osteoblasts
  • In vitro osteogenesis
  • Magneto-mechanical actuation
  • Mineralization

ASJC Scopus subject areas

  • Medicine (all)

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