Biocompatibility of magnesium phosphate minerals and their stability under physiological conditions

被引：166

作者：

Tamimi, Faleh ^{[1
]}

Le Nihouannen, Damien ^{[1
]}

Bassett, David C. ^{[1
]}

Ibasco, Suzette ^{[1
]}

Gbureck, Uwe ^{[2
]}

Knowles, Jonathan ^{[3
,5
]}

Wright, Adrian ^{[4
]}

Flynn, Andrew ^{[1
]}

Komarova, Svetlana V. ^{[1
]}

Barralet, Jake E. ^{[1
]}

机构：

[1] McGill Univ, Fac Dent, Montreal, PQ, Canada

[2] Univ Wurzburg, Dept Funct Mat Med & Dent, Wurzburg, Germany

[3] UCL, Eastman Dent Inst, London, England

[4] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

[5] Dankook Univ, WCU Res Ctr Nanobiomed Sci, Cheonan Si 330714, Chungnan, South Korea

来源：

ACTA BIOMATERIALIA | 2011年 / 7卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Magnesium phosphate; Newberyite; Cattiite; Gene expression; Cytotoxicity; CALCIUM PHOSPHATES; GAS-PHASE; NEWBERYITE; MGHPO4.3H2O; CRYSTAL; SOLUBILITY; COMPLEXES; HYDRATION; SURGERY; CEMENT;

D O I：

10.1016/j.actbio.2011.02.007

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

Magnesium phosphates such as newberyite (MgHPO4 center dot 3H(2)O) are formed in vivo and are known to be biodegradable and nontoxic after implantation. Indeed, magnesium apatites have been shown to support osteoblast differentiation and function, and bone formation can occur around metallic magnesium implants. However, very little is known regarding the precipitation and stability of magnesium phosphates in physiological environments. In order to address this, the aqueous formation of magnesium phosphate as a function of pH, temperature and ion concentration is reported. Physicochemical characterization of the precipitates was carried out: additionally, biocompatibility and gene expression of osteoblast differentiation markers for bone formation via an in vitro cell culture assay were determined. Precipitation conditions for newberyite, tribasic magnesium phosphate pentahydrate, holtedahlite, bobierrite and cattiite were determined. Under physiological conditions of pH, temperature and magnesium phosphate concentration, no precipitates were formed. However, at concentrations 10-100 times higher than physiological, magnesium phosphate precipitates of cattiite and newberyite were formed. These two minerals demonstrated biocompatibility with osteoblast cultures and induced osteoblast adhesion and differentiation. The pattern of expression of OCN and CollA1 genes in the presence of newberyite crystals was comparable to that of calcium phosphate bioceramics. In our experiments, we have shown that certain magnesium phosphate phases such as newberyite and cattiite are able to promote in vivo osteogenic activity in a similar way to calcium phosphates such as hydroxyapatite and brushite. This confirms the great potential of magnesium phosphate ceramics in the development of new biomaterials for bone regeneration. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2678 / 2685

页数：8

共 36 条

[1] CRYSTALLIZATION OF 2 MAGNESIUM PHOSPHATES, STRUVITE AND NEWBERYITE - EFFECT OF PH AND CONCENTRATION [J].