项目名称: miR-98/PDGF-BB/Sp7反馈调控环路在骨质疏松症发病机制中的作用研究
项目编号: No.81500686
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 医药、卫生
项目作者: 杨丽
作者单位: 湖南省人民医院
项目金额: 18万元
中文摘要: 骨质疏松症严重危害人类健康。骨形成机制已上升为“血管生成-成骨细胞-破骨细胞”的三元调控理论。血管病变可直接导致成骨细胞和破骨细胞功能的异常.PDGF-BB通过诱导血管内皮细胞形成和促进细胞分化,偶联血管生成和骨形成。成骨细胞可在TGF-β和bFGF诱导下表达PDGF-BB。miR-98表达于成骨细胞。生物信息学预测PDGF-BB为miR-98的靶基因。另外,miR-98的启动子区有转录因子Sp7的结合位点.过表达miR-98抑制成骨细胞矿化,荧光素酶报告基因实验、过表达、抑制实验验证PDGF-BB为miR-98的靶基因,EMSA、CHIP、过表达实验等验证Sp7作为转录因子调节miR-98的表达。OVX小鼠实验进一步验证miR-98/PDGF-BB/Sp7调控环路的存在,骨微CT、骨代谢指标以及血管体积的测定验证miR-98通过PDGF-BB影响微血管生成以及成骨细胞分化来调控骨代谢。
中文关键词: microRNA;靶基因;血管生成;成骨细胞;转录因子
英文摘要: Osteoposis severly endangers human health. Bone formation mechanism has been promoted to be “angiogenesis –osteoblast(OB)-osteoclast(OC) triarchic theory. Vasculopathy can directly lead to abnormal function of osteoblast and osteoclast. PDGF-BB coupled vessel formation and bone formation by inducing vascular endothelial cell generation and promoting cell differentiation. PDGF-BB could be secreted in OB induced by TGF-β and bFGF. miR-98 was expressed during OB differentiation. Bioinformatic computing was used to predict PDGF-BB was the target gene of miR-98 and the promoter region of miR-98 harbors Sp7 combined sites. Overexpressed, inhibited experiments, Luciferase reporter gene, CHIP, EMSA expremients verified our scientific hypothesis. OVX mice experiment further verified the miR-98/PDGF-BB/Sp7 function loop in bone formation. Bone μCT, biochemical markers of bone metabolism and vessel volume measurement experiments reveal the mechanism of the function loop in animal. Our research will provide a new idea of osteoposis treatment.
英文关键词: miRNA;target gene;angiogenesis;osteoblast;transcription factor