Vascular calcification is a key risk factor of cardiovascular disease. Our previous study showed that miR-27a was aberrantly down-regulated in the endothlial progenitor cells(EPCs) in DM patients and artery calcification patients. We also found OPN and BMP2 expression increased through its target Runx2 and IRS-1 and thus could potentiate EPCs transfer to Osteoclast-like cells. In this study, we established a series of protocols to explore the signaling pathways Notch,Wnt and TGFβ/BMP of miR-27a in the process of EPCs transfer to Osteoclast-like cells(OLCs) and artery calcification. We further plan to testify these effects in vivo in APOE-/- mice and miR-27a-/-mice. Our study will certainly contribute to clarify the mechanisms of miR-27a-regulated EPCs-OlCs transition and to prevent the vascular complications in patients with artery calcification.
血管钙化是反映心血管疾病严重程度及影响其预后的主要因素,病理显示糖尿病患者血管钙化异常明显。我们前期研究发现,糖尿病患者EPCs上miR-27a表达明显下降,并与调控血管钙化的多种关键蛋白和信号通路密切相关,提示miR-27a可能是调控血管钙化的关键靶点。本研究首先体外探讨EPCs 上miR-27a 表达水平与糖尿病氧化应激环境的相关性,并建立氧化应激诱导的血管钙化模型,通过转染miR-27a 模拟物或抑制剂,阐明miR-27a 调控EPCs 向成骨样细胞分化或抑制EPCs 分化具体过程和机制;体内建立小鼠血管钙化模型,观察miR-27a对血管钙化程度的影响,并探讨miR-27a对Runx2、IRS-1、OPN 和BMP2 表达以及相关信号传导通路Notch, Wnt和/或TGFβ/BMP等的作用,最终体内外明确miR-27a对血管钙化作用及机制,为血管钙化防治提供新的靶点。
血管钙化是反映心血管疾病严重程度及影响其预后的主要因素,病理显示糖尿病患者血管钙化异常明显。我们的研究发现,糖尿病患者EPCs上miR-27a表达明显下降,并与调控血管钙化的多种关键蛋白和信号通路密切相关,提示miR-27a可能是调控血管钙化的关键靶点。本研究首先体外探讨EPCs 上miR-27a 表达水平与糖尿病氧化应激环境的相关性,并建立氧化应激诱导的血管钙化模型,通过转染miR-27a 模拟物或抑制剂,阐明miR-27a 调控EPCs 向成骨样细胞分化或抑制EPCs 分化具体过程和机制;体内建立小鼠血管钙化模型,观察miR-27a对血管钙化程度的影响,并探讨miR-27a对Runx2、IRS-1、OPN 和BMP2 表达以及相关信号传导通路Notch, Wnt和/或TGFβ/BMP等的作用,最终体内外明确miR-27a对血管钙化作用及机制,为血管钙化防治提供新的靶点。
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数据更新时间:2023-05-31
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