项目名称: 骨髓源性巨噬细胞microRNA-155对动脉粥样硬化的调控机制
项目编号: No.81670412
项目类型: 面上项目
立项/批准年度: 2017
项目学科: 医药、卫生
项目作者: 杜芬
作者单位: 武汉大学
项目金额: 25万元
中文摘要: microRNA-155(miR-155)由Bic基因的外显子编码,参与调节细胞炎症反应,在巨噬细胞中表达量较高。我们前期研究发现miR-155在小鼠和人类动脉粥样硬化(AS)斑块中高表达。apoE-/-小鼠miR-155-/-巨噬细胞炎症因子表达降低,细胞炎性反应降低起主导作用,AS斑块减少;而骨髓细胞miR-155-/-的LDLR-/-小鼠血浆炎症因子水平未见明显改变,但AS斑块中巨噬细胞凋亡率增加以致斑块生成增加。我们推测模型小鼠细胞基因型以及脂蛋白血症的差异,导致微环境改变下巨噬细胞miR-155靶基因的表达水平变化,miR-155靶向性发生改变,从而影响巨噬细胞功能。我们拟关注在不同基因型细胞或在不同脂蛋白血症环境下细胞miR-155靶向性变化,系统性研究骨髓源性巨噬细胞miR-155在不同微环境下调控细胞功能的动态机制,此研究将有利于寻找针对性治疗AS的新策略。
中文关键词: 动脉粥样硬化;骨髓来源巨噬细胞;微小RNA-155;靶基因;微环境
英文摘要: microRNA-155 (miR-155) plays important roles in the macrophage inflammatory response. Our previous study found that miR-155 was highly expressed in macrophages of mouse and human atherosclerosis (AS) plaque. The deficiency of miR-155 could inhibit inflammation and attenuate atherogenesis in apoE-/- mice, but miR-155-/- hematopoietic cells promoted AS formation in LDLR-/- mice by promoting macrophage apoptosis. We speculate that the expression of miR-155 related mRNAs are different that depend on differences in genotype or lipoproteinaemia. miR-155 switches the targets in macrophages and regulates cells function in different microenvironment. We will focus on the targets of miR-155 in different genotype cells or lipoproteinaemia. We also will study the miR-155 induced regulatory mechanisms under the different microenvironment in bone marrow derived macrophage miR-155-/- or transgenic in apoE-/- or LDLR-/- mice . The results will promote personalized strategies in the treatment and diagnosis of AS.
英文关键词: atherosclerosis;bone marrow derived macrophage;microRNA-155;taget gene;microenvironment