title: Effects of strontium in modified biomaterials.
abstract: Strontium (Sr) plays a special role in bone remodelling, being associated with both the stimulation of bone formation and a reduction in bone resorption. Thus, the modification of biomaterials by partial or full substitution by Sr is expected to increase both bioactivity and biocompatibility. However, such effects have to be studied individually. Although no phase transition was found in Sr-substituted hydroxyapatite (Sr-HA), Sr-containing calcium silicate (Sr-CS) or Sr-containing borosilicate (Sr-BS), their biological performance was substantially affected by changes in the physico-chemical properties and Sr content of the materials. Three distinct outcomes were found for the presence of Sr: (1) increased HA solubility; (2) no significant effect on the degradation rate of CS; (3) apparent inhibition of the otherwise rapid degradation of BS. In each case the released Sr affected osteoblast proliferation and alkaline phosphatase activity, with clear evidence that an optimum Sr dose exists. Such chemical and biological variations must be disentangled for the behaviour to be properly understood and materials design to be advanced.
authors.affiliation: Department of Orthopaedics, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiaotong University School of Medicine, People's Republic of China.
authors.forename: Weibin
authors.initials: W
authors.lastname: Zhang
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Shen
authors.forename: Haobo
authors.initials: H
authors.lastname: Pan
authors.forename: Kaili
authors.initials: K
authors.lastname: Lin
authors.forename: Xiaoguo
authors.initials: X
authors.lastname: Liu
authors.forename: Brian W
authors.initials: BW
authors.lastname: Darvell
authors.forename: William W
authors.initials: WW
authors.lastname: Lu
authors.forename: Jiang
authors.initials: J
authors.lastname: Chang
authors.forename: Lianfu
authors.initials: L
authors.lastname: Deng
authors.forename: Deping
authors.initials: D
authors.lastname: Wang
authors.forename: Wenhai
authors.initials: W
authors.lastname: Huang
mesh_terms: D001672:Biocompatible Materials / Q000494:pharmacology*; D017610:Calcium Compounds / Q000494:pharmacology; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D017886:Durapatite / Q000494:pharmacology; D006801:Humans; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects; D017640:Silicates / Q000494:pharmacology; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D013324:Strontium / Q000494:pharmacology*; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D017610:Calcium Compounds; D017640:Silicates; D017886:Durapatite; C031293:calcium silicate; D013324:Strontium