College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, P.R. China.
Biomater Sci. 2016 Apr;4(4):678-88. doi: 10.1039/c5bm00482a. Epub 2016 Feb 12.
For bioceramic scaffolds employed in clinical applications, excellent bioactivity and tenacity were of great importance. Modifying inorganic SCPP scaffolds with biological macromolecules could obviously improve its bioactivity and eliminate its palpable brittleness. However, it was hard to execute directly due to extremely bad interfacial compatibility between them. In this research, dopamine (DOPA) was introduced onto strontium-doped calcium polyphosphate (SCPP) scaffolds, subsequently the preliminary material was successfully further modified by silk fibroin (SF). SCPP/D/SF possessed suitable biomechanical properties, ability to stimulate angiogenic factor secretion and excellent biocompatibility. Biomechanical examination demonstrated that SCPP/D/SF scaffolds yielded better compressive strength because of improved interfacial compatibility. MTT assay and CLSM observation showed that SCPP/D/SF scaffolds had good cytocompatibility and presented better inducing-cell-migration potential than pure SCPP scaffolds. Meanwhile, its ability to stimulate angiogenic factor secretion was measured through the ELISA assay and immunohistological analysis in vitro and in vivo respectively. The results revealed, superior to SCPP, SCPP/D/SF could effectively promote VEGF and bFGF expression, possibly leading to enhancing angiogenesis and osteogenesis. In a word, SCPP/D/SF could serve as a potential bone tissue engineering scaffold for comparable biomechanical properties and excellent bioactivity. It provided a novel idea for modification of inorganic materials to prepare promising bone tissue engineering scaffolds with the ability to accelerate bone regeneration and vascularization.
对于应用于临床的生物陶瓷支架,优异的生物活性和韧性非常重要。用生物大分子修饰无机 SCPP 支架可以明显提高其生物活性,并消除其明显的脆性。然而,由于它们之间极糟糕的界面相容性,直接执行这项操作非常困难。在这项研究中,多巴胺(DOPA)被引入到掺锶的钙聚磷酸盐(SCPP)支架上,随后初步材料成功地被丝素蛋白(SF)进一步修饰。SCPP/D/SF 具有合适的生物力学性能、刺激血管生成因子分泌的能力和良好的生物相容性。生物力学检查表明,由于界面相容性的提高,SCPP/D/SF 支架产生了更好的抗压强度。MTT 检测和 CLSM 观察表明,SCPP/D/SF 支架具有良好的细胞相容性,并且比纯 SCPP 支架具有更好的诱导细胞迁移潜力。同时,通过 ELISA 检测和体内外免疫组织化学分析分别测量其刺激血管生成因子分泌的能力。结果表明,与 SCPP 相比,SCPP/D/SF 可以有效地促进 VEGF 和 bFGF 的表达,可能导致血管生成和成骨的增强。总之,SCPP/D/SF 可以作为一种有潜力的骨组织工程支架,具有相当的生物力学性能和优异的生物活性。它为修饰无机材料提供了一个新的思路,以制备具有加速骨再生和血管化能力的有前途的骨组织工程支架。