项目名称: SiRNA复合HA/TCP多孔支架构建成骨基因干预功能材料的探索性研究
项目编号: No.81201380
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 医学四处
项目作者: 赵彦涛
作者单位: 中国人民解放军总医院
项目金额: 23万元
中文摘要: 骨替代材料在体内扮演着引导骨组织再生的角色,骨再生过程受到成骨相关基因的严格调控。SiRNA被发现具有精确沉默目标基因mRNA的能力,针对负调控成骨基因实施RNA干扰,可以高效发挥成骨潜能,提高骨再生的速度和质量。Plekho1基因及其所编码的蛋白具有负调控成骨功能的作用,其siRNA可以高效沉默该基因表达及蛋白翻译,从而促进骨形成,同时不影响破骨细胞的功能。大量研究说明HA/TCP支架材料具有一定骨传导能力和可降解性,结合凝胶体系通过冷冻干燥工艺制备复合siRNA支架,植入体内可缓慢释放siRNA对原位成骨细胞Plekho1基因实施精确沉默, 使之成为一种全新意义的基因干预功能材料。同时采用(AspSerSer)6提高siRNA作用的靶向性及安全性。本课题对siRNA复合材料的转染效率、促进成骨效应、不良影响及临床应用前景等进行探索性研究,将为骨替代材料研究提供新思路。
中文关键词: Plekhol;SiRNA;脂质体;煅烧骨;甘油明胶
英文摘要: Bone substitute plays a role of guiding bone tissue growth, the process of which is strictly regulated by genes. SiRNA has been found to silence targeting gene mRNA precisely. RNA intererence against negative regulating gene in bone formation can incite cell potential capability and improve the rate and quality of bone formation. Plekho1 gene and coded protein regulate bone phenotype negatively. SiRNA of Plekhol gene can enhance bone formation without influencing osteoclast. HA/TCP scaffold has the characters of osteoconduction and degradability. SiRNA is incorborated into scaffold by gel and freeze-drying method. SiRNA is released in vivo and scilence Plekho1 precisely, turning the scaffold into a gene funtional bone substitue. (AspSerSer)6 molecular targeting bone formation area is used to adhere siRNAs at these areas and transfect osteoblast targetedly and safely. Cell experiment and in vivo test are adopted to evaluate transfection efficacy bone formation and side effect of the novel material. This project is aimed to find a new path in the research of bone substitute.
英文关键词: Plekhol;SiRNA;liposome;Calcined bone;glycerogelatin