文献类型：期刊文献

英文题名：Effects of four types of hydroxyapatite nanoparticles with different nanocrystal morphologies and sizes on apoptosis in rat osteoblasts

作者：Xu, Zhengli[1];Liu, Changsheng[2];Wei, Jie[2];Sun, Jiao[1]

机构：[1]Shanghai Jiao Tong Univ, Peoples Hosp 9, Shanghai Biomat Res & Testing Ctr, Shanghai Key Lab Stomatol,Sch Med, Shanghai 200023, Peoples R China;[2]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Engn Res Ctr Biomed Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2012

卷号：32

期号：6

起止页码：429

外文期刊名：JOURNAL OF APPLIED TOXICOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000303156400007)】；

基金：This work was supported by grants from Nanional Natural Science Foundation (30470479), Shanghai Sci-Tech Committee Foundation (0752 nm026, 08DZ2291600) and Shanghai Leading Academic Discipline Project (S30206).

语种：英文

外文关键词：hydroxyapatite nanoparticles; osteoblast; inhibition; apoptosis; ROS; p53; cytochrome c

摘要：Hydroxyapatite nanoparticles (nano-HAP) have been reported to cause inflammatory reactions. Here, we aimed to compare the effects of four types of nano-HAP with different nanocrystal morphologies (short rod-like, long rod-like, spherical or needle-shaped crystals) and sizes (10-20, 10-30 or 20-40?nm) on growth inhibition and apoptosis in primary cultured rat osteoblasts. The osteoblasts was treated with the four types of nano-HAP at various concentrations (20, 40, 60, 80 or 100?mg?l-1). The nano-HAP specific surface area was detected using the Brunauer, Emmet and Teller method. The cell growth rate was detected using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay; apoptotic alterations and the level of reactive oxygen species in osteoblasts were measured using flow cytometry; and the amounts of apoptotic p53 and cytochrome c proteins were measured using western blotting. We observed that all four types of nano-HAP inhibited the growth of osteoblasts in a dose-dependent manner. These nano-HAP significantly induced apoptosis in osteoblasts. Nano-HAP with smaller specific surface areas induced lower apoptosis rates. The needle-shaped and the short rod-like particles induced greater cellular injury than the spherical and long rod-like particles, respectively. The increased apoptosis rates were accompanied by increased p53 and cytochrome c expression. These findings indicate that nano-HAP inhibit the activity of osteoblasts and also induce the apoptosis of osteoblasts in vitro. These findings also suggest that the nano-HAP-induced apoptotic pathway is mediated by a mitochondrial-dependent pathway. Moreover, the sizes, morphologies and concentrations of nano-HAP have significant effects on the apoptotic level. Copyright (C) 2011 John Wiley & Sons, Ltd.