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In Vitro Study on Different Cell Response to Spherical Hydroxyapatite Nanoparticles

¹ Department of Materials Science and Engineering University Missouri-Rolla, 223 McNutt Hall, Rolla, Missouri 65409, USA, School of Materials Science and Engineering, Tongji University Shanghai 200092, China
² Department of Materials Science and Engineering University Missouri-Rolla, 223 McNutt Hall, Rolla, Missouri 65409, USA
³ School of Materials Science and Engineering, Tongji University Shanghai 200092, China, Materials Research Center, University of Missouri-Rolla 101 Straumanis Hall, Rolla, MO 65409, USA
⁴ School of Materials Science and Engineering, Tongji University Shanghai 200092, China
⁵ Tongji Hospital Affiliated Tongji University, Shanghai, 200065, China

^* To whom correspondence should be addressed.

	Abstract

Hydroxyapatite (HA) is widely used in filling of bone defects and coating on metal parts of prosthetic implants due to its excellent biocompati-bility, bioactivity, and bone-bonding properties. It has been demonstrated that micro-sized HA particles cause inflammatory reaction, especially for the needle shaped particles. However, little effort has been concentrated on the cell responses of the spherical HA nanoparticles. The aim of the present work is to chemically and physically characterize the synthesized HA nanoparticles and to investigate the in vitro cell responses. X-ray diffraction, electron microscopy, nitrogen adsorption, and Fourier transform infrared spectroscopy revealed that the particles consisted of nearly spherical crystallites of carbonate-substituted HA with size of 20–40 nm and specific surface area of 75 m²/g. L929 cell proliferation experiments demonstrate that the spherical HA nanoparticles is more biocompatible than commercially available HA. On the other hand, U2-OS cell test results show that the inhibition rate of the spherical HA nanoparticles increases with time and concentration. The half effective inhibitory concentration (IC50) of the nanoparticles was determined to be 50.8 µg/mL at 72 h. All these data indicated that the synthesized spherical nanocrystalline HA particles can function as an effective biomaterial for bone tumorectomy repair, while having little adverse effect.

Key Words: nanocrystalline hydroxyapatite, cell proliferation, cell responses, biomaterials, L929 cell line.

First published on January 14, 2008, doi:10.1177/0885328207081350

Journal of Biomaterials Applications 2008;23:37.

A more recent version of this article appeared on July 1, 2008


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