Local release of magnesium from mesoporous TiO2 coatings stimulates the peri-implant expression of osteogenic markers and improves osteoconductivity in vivo

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Local release of magnesium from mesoporous TiO2 coatings stimulates the peri-implant expression of osteogenic markers and improves osteoconductivity in vivo

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Publication Article, peer reviewed scientific
Title Local release of magnesium from mesoporous TiO2 coatings stimulates the peri-implant expression of osteogenic markers and improves osteoconductivity in vivo
Author(s) Galli, Silvia ; Naito, Yoshihito ; Karlsson, Johan ; He, Wenxiao ; Miyamoto, Ikuya ; Xue, Ying ; Andersson, Martin ; Mustafa, Kamal ; Wennerberg, Ann ; Jimbo, Ryo
Date 2014
English abstract
Local release of Mg ions from titanium implant surfaces has been shown to enhance implant retention and integration. To clarify the biological events that lead to this positive outcome, threaded implants coated with mesoporous TiO2 thin films were loaded with Mg-ions and placed in the tibia of rabbits for 3 weeks, after surface characterization. Non-loaded mesoporous coated implants were used as controls. Peri-implant gene expression of a set of osteogenic and inflammatory assays was quantified by means of real-time quantitative polymerase chain reaction. The expression of three osteogenic markers (OC, RUNX-2 and IGF-1) was significantly more pronounced in the test specimens, suggesting that the release of Mg ions directly at the implant sites may stimulate an osteogenic environment. Furthermore, bone healing around implants was evaluated on histological slides and by diffraction-enhanced imaging (DEI), using synchrotron radiation. The histological analysis demonstrated new bone formation around all implants, without negative responses, with a significant increase in the number of threads filled with new bone for test surfaces. DEI analysis attested the high mineral content of the newly formed bone. Improved surface osteoconductivity and increased expression of genes involved in the bone regeneration were found for magnesium-incorporation of mesoporous TiO2 coatings.
DOI http://dx.doi.org/10.1016/j.actbio.2014.08.011 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue Acta Biomaterialia;12
Volume 10
ISSN 1742-7061
Pages 5193–5201
Language eng (iso)
Subject(s) Magnesium
Local drug delivery osseointegration
Nanotopography
Diffraction-enhanced imaging
Gene expression
Sciences
Research Subject Categories::MEDICINE
Handle http://hdl.handle.net/2043/17995 (link to this page)

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