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Nanostructured calcium phosphate coatings on magnesium alloys: characterization and cytocompatibility with mesenchymal stem cells

  • Maria Emil Iskandar
  • Arash Aslani
  • Qiaomu Tian
  • Huinan LiuEmail author
Engineering and Nano-engineering Approaches for Medical Devices
Part of the following topical collections:
  1. Engineering and Nano-engineering Approaches for Medical Devices

Abstract

This article reports the deposition and characterization of nanostructured calcium phosphate (nCaP) on magnesium–yttrium alloy substrates and their cytocompatibility with bone marrow derived mesenchymal stem cells (BMSCs). The nCaP coatings were deposited on magnesium and magnesium–yttrium alloy substrates using proprietary transonic particle acceleration process for the dual purposes of modulating substrate degradation and BMSC adhesion. Surface morphology and feature size were analyzed using scanning electron microscopy and quantitative image analysis tools. Surface elemental compositions and phases were analyzed using energy dispersive X-ray spectroscopy and X-ray diffraction, respectively. The deposited nCaP coatings showed a homogeneous particulate surface with the dominant feature size of 200–500 nm in the long axis and 100–300 nm in the short axis, and a Ca/P atomic ratio of 1.5–1.6. Hydroxyapatite was the major phase identified in the nCaP coatings. The modulatory effects of nCaP coatings on the sample degradation and BMSC behaviors were dependent on the substrate composition and surface conditions. The direct culture of BMSCs in vitro indicated that multiple factors, including surface composition and topography, and the degradation-induced changes in media composition, influenced cell adhesion directly on the sample surface, and indirect adhesion surrounding the sample in the same culture. The alkaline pH, the indicator of Mg degradation, played a role in BMSC adhesion and morphology, but not the sole factor. Additional studies are necessary to elucidate BMSC responses to each contributing factor.

Keywords

Mass Gain Scanning Electron Micrographs Image Standard Cell Culture Condition Dicalcium Phosphate Dihydrate Initial Seeding Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors would like to thank the NSF BRIGE award (CBET 1125801), NIH/NIDCR SBIR award (6 R43 DE023287-02), and the University of California Regents Faculty Fellowship (H.L.) for financial support. We would also like to thank Dr. Krassimir Bozhilov at the Central Facility for Advanced Microscopy and Microanalysis (CFAMM) for the SEM training at the University of California, Riverside.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of BioengineeringUniversity of California at RiversideRiversideUSA
  2. 2.N2 Biomedical LLCBedfordUSA
  3. 3.Materials Science and EngineeringUniversity of California at RiversideRiversideUSA
  4. 4.Stem Cell CenterUniversity of California at RiversideRiversideUSA

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