Chondrogenic differentiation of ATDC5-cells under the influence of Mg and Mg alloy degradation

• Published in: Materials Science & Engineering C 2017-03, Vol.72, p.378-388
• Main Authors: Martinez Sanchez, Adela H., Feyerabend, Frank, Laipple, Daniel, Willumeit-Römer, Regine, Weinberg, Annelie, Luthringer, Bérengère J.C.
• Format: Article
• Language: English
• Subjects: Alloy systems; Alloying effects; Alloys; Alloys - chemistry; Alloys - metabolism; Alloys - pharmacology; Biocompatibility; Biocompatible Materials - chemistry; Biocompatible Materials - metabolism; Biocompatible Materials - toxicity; Biodegradability; Biodegradable materials; Biodegradation; Bone growth; Bones; Cartilage; Cell culture; Cell differentiation; Cell Differentiation - drug effects; Cell Line; Cell proliferation; Cell size; Cell Survival - drug effects; Children; Chondrocytes - cytology; Chondrocytes - metabolism; Chondrogenesis; Chondrogenesis - drug effects; Collagen Type I - genetics; Collagen Type I - metabolism; Core Binding Factor Alpha 1 Subunit - genetics; Core Binding Factor Alpha 1 Subunit - metabolism; Culture; Degradation; Degradation products; Differentiation; Electrochemical machining; Extracellular matrix; Gadolinium; Gene expression; Gene Expression - drug effects; Growth conditions; Growth plate; Homogeneity; Humans; Hydrogen-Ion Concentration; In vitro testing; In vivo methods and tests; Magnesium; Magnesium - chemistry; Magnesium alloys; Magnesium base alloys; Materials science; Microscopy, Electron, Scanning; Mineralization; pH effects; Silver; SOX9 Transcription Factor - genetics; SOX9 Transcription Factor - metabolism; Spectrometry, X-Ray Emission; Surgical implants
• ISSN: 0928-4931; 1873-0191
• DOI: 10.1016/j.msec.2016.11.062

Biodegradable magnesium (Mg)-based materials are a potential alternative to permanent implants for application in children. Nevertheless effects of those materials on growth plate cartilage and chondrogenesis have not been previously evaluated. In vitro differentiation of ATDC5 cells was evaluated under the influence of pure Mg (PMg), Mg with 10wt% of gadolinium (Mg-10Gd) and Mg with 2wt% of silver (Mg-2Ag) degradation products (extracts) and direct cell culture on the materials. Gene expression showed an inhibitory effect on ATDC5 mineralization with the three extracts and a chondrogenic potential of Mg-10Gd. Cells cultured in Mg-10Gd and Mg-2Ag extracts showed the same proliferation and morphology than cells cultured in growth conditions. Mg-10Gd induced an increase in production of ECM and a bigger cell size, similar to the effects found with differentiation conditions. An increased metabolic activity was observed in cells cultured under the influence of Mg-10Gd extracts, indicated by an acidic pH during most of the culture period. After 7days of culture on the materials, ATDC5 growth, distribution and ECM synthesis were higher on Mg-10Gd samples, followed by Mg-2Ag and PMg, which was influenced by the homogeneity and composition of the degradation layer. This study confirmed the tolerance of ATDC5 cells to Mg-based materials and a chondrogenic effect of Mg-10Gd. Further studies in vitro and in vivo are necessary to evaluate cell reactions to those materials, as well as the effects on bone growth and the biocompatibility of the alloying system in the body. •Degradation of PMg, and Mg-2Ag do not influence ATDC5 cells growth and chondrogenic redifferentiation.•Mg-10Gd enhances fast chondrogenic redifferentiation and expression of hyperthrophic markers on ATDC5 cells.•Further evaluation of the effects of PMg, Mg-10Gd and Mg-2Ag in vivo are necessary to confirm its potential for application in growing bones.