Determination of antibacterial properties and cytocompatibility of silver-loaded coral hydroxyapatite.
In this study, silver-loaded coral hydroxyapatites (SLCHAs) were used as scaffolds for bone tissue engineering. The SLCHAs were prepared by surface adsorption process and ion-exchange reaction between Ca(2+) of coral hydroxyapatite (CHA) and Ag(+) of silver nitrate with different concentrations at room temperature. The properties of the composite SLCHAs were investigated by inductively coupled plasma-atomic emission spectrometry (ICP-AES), scanning electron microscropy (SEM) equipped with backscattered electron detector (BSE), and energy-dispersive X-ray spectrometer (EDS). The SEM images showed that the morphology of the SLCHAs depended on the content of Ag(+), and the silver ions were uniformly distributed on the surface of SLCHAs. The ICP-AES results demonstrated that the silver content of the SLCHAs decreased along with the decrease of the concentration of silver nitrate. The SLCHAs were found effective against Escherichia coli and Staphylococcus aureus by antibacterial test. Mouse embryonic pre-osteoblast cells (MC3T3-E1) were used to test the cytocompatibility of SLCHAs, CHA, and pure coral. Cell morphology and cell proliferation were studied with SEM, laser scanning confocal microscope (LSCM), and MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay after 1, 3, and 5 days of culture. The results indicated the cell morphology and proliferation on the scaffolds of Ag(+) (13.6 microg/ml)/CHA and Ag(+) (1.7 microg/ml)/CHA were better than that on Ag(+) (170 microg/ml)/CHA. In addition, adhesion of MC3T3-E1 on the scaffolds showed that the confluent cells showed fusiform shape and arranged tightly on the scaffolds. All the results showed that the antibacterial SLCHAs would have potential clinical application as the scaffolds for bone tissue engineering.
Department of Orthopaedics, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, People's Republic of China. zhangyu1980cmu@yahoo.com.cn
Yu
Y
Zhang
Qing-Shui
QS
Yin
Yu
Y
Zhang
Hong
H
Xia
Fu-Zhi
FZ
Ai
Yan-Peng
YP
Jiao
Xu-Qiong
XQ
Chen
D000818:Animals; D037421:Anthozoa / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004337:Drug Carriers / Q000378:metabolism / Q000494:pharmacology; D017886:Durapatite / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D008422:Materials Testing; D051379:Mice; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000187:drug effects / Q000502:physiology; D012834:Silver / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D013499:Surface Properties; D054457:Tissue Scaffolds / Q000737:chemistry / Q000382:microbiology
D000900:Anti-Bacterial Agents; D004337:Drug Carriers; D012834:Silver; D017886:Durapatite