多巴胺载入对磷酸钙骨水泥性能的影响及体外生物学评价

本实验利用具有良好生物相容性和强黏附性能的多巴胺(dopamine,DA)提高磷酸钙骨水泥(calcium phosphate cement,CPC)的抗压强度,采用X射线衍射仪、X射线光电子能谱仪、万能材料力学试验机和场发射扫描电镜研究载多巴胺磷酸钙骨水泥(DA-CPC)的理化性能;将DA-CPC与成骨细胞(MC3T3-E1)体外共培养,以荧光显微镜观察细胞形貌,并进行Alamar Blue和碱性磷酸酶检测,研究DA载入后对成骨细胞增殖和分化的影响。结果表明:DA载入CPC中可发生自聚合形成聚多巴胺,促进CPC中的α-TCP和DCPD的溶解与转化,并不改变最终水化相成分;显著地提高CPC的抗压强度;DA的载入有利于成骨细胞的早期粘附和增殖,并不影响其分化。本实验表明载入DA的CPC具有良好的生物相容性,载入DA为提高CPC的抗压强度提供了一条可能的途径。     

载黄芪多糖羟基磷灰石的制备及生物学性能评价

室温湿法合成载不同浓度黄芪多糖(APS)的羟基磷灰石(HA/APS), 通过X射线衍射(XRD)表征APS对HA晶体结构、结晶度及晶粒尺寸的影响; 用透射电子显微镜(TEM)表征HA和HA/APS的晶体形貌, 用激光粒度仪和比表面积仪分别检测HA的粒度及比表面积;体外培养MC3T3-E1成骨细胞, 进行Alamar Blue、噻唑蓝(MTT)及碱性磷酸酶(ALP)检测, 光镜观察细胞形貌, 研究APS对成骨细胞作用的有效浓度范围及HA/APS对成骨细胞活性及分化的影响. 结果表明: 所载APS对HA晶体结构、结晶度和晶粒尺寸没有明显影响, 晶体形貌没有变化, HA平均粒径为1.17 μm, 比表面积为132.194 m²/g;APS对成骨细胞的作用呈剂量和时间依赖关系, 80~200 μg/mL促进细胞活性及ALP表达, HA/APS增强细胞活性, 细胞形貌完整. 因此, 0.5 g HA载入100~250 μg APS时明显促进成骨细胞活性, HA/APS具有作为临床骨缺损填充材料的潜能.     

The drug-carrier interactions, release behaviors and cell responses of hydroxyapaptite containing several Chinese medicines

The present work shows drug-carrier interactions, release behaviors and cell responses of hydroxyapatite (HA) containing salvianolic acid B (Sal B), astragalus polysaccharide (APS), and naringin. X-ray diffraction (XRD) showed that the crystallinity and crystal size of HA decreased significantly when Sal B was added (p<0.05). Transmission electron microscope (TEM) confirmed that the nano-acicular crystals of HA containing Sal B were the most fine among all specimens. It was conjectured that Sal B preferentially adsorbed on the positively charged surface of HA crystals to inhibit their growth. In vitro release of HA containing Chinese medicines followed the first-order equation. The drug-carrier affinity between HA and Sal B might have prolonged the release of Sal B. The proliferation and differentiation of osteoblasts were promoted by Chinese medicines containing HA in the time and dosage dependent manner. The osteoblasts displayed a polygonal morphology with cell-cell junctions in all cases. It is suggested that the contained Chinese medicines would promote the activities of the osteoblasts.     

骨碎补载入对磷酸钙骨水泥性能的影响及体外生物学评价

通过在湿法合成的二水磷酸氢钙膏体中加入中药骨碎补的提取物, 作为磷酸钙骨水泥(Calcium Phosphate Cement,CPC)原料之一, 分别制备0、5wt%、10wt%和15wt%的载骨碎补磷酸钙骨水泥. 采用Gilmore针、X射线衍射仪、红外光谱仪、万能材料试验机、扫描电子显微镜和紫外分光光度计研究载骨碎补CPC的理化性能和药物释放; 体外培养MC-3T3成骨细胞, 进行Alamar Blue和碱性磷酸酶检测, 研究载骨碎补CPC对成骨细胞增殖和分化的影响, 扫描电子显微镜观察细胞形貌. 结果表明: 随骨碎补浓度的增加, CPC凝结时间明显延长, 其抗压强度显著提高; 骨碎补促进初期CPC的水化, 却阻碍了α-磷酸三钙的转化, 且随骨碎补浓度增大作用愈明显, 骨碎补不影响CPC水化后的相成分; 含骨碎补CPC的微观形貌中出现片状和针状晶体, 结构较空白CPC更加致密; 药物释放分为突释和缓释两个阶段, 符合Higuchi基质扩散释放模型; 载骨碎补CPC对成骨细胞的作用呈剂量和时间依赖关系, 培养5d时浓度为5wt%和10wt%的CPC较明显地促进细胞增殖, 7d时载骨碎补CPC的细胞增殖较稳定, 细胞分化能力无显著性差异; 成骨细胞在载骨碎补CPC表面生长形态良好, 表明该材料具有较好的生物相容性.