COBRE: OK MED RES FOUND: P5: ROLE OF PROTEOGLYCAN IN ATHEROGENESIS

本子项目是利用由NIH/NCRR资助的中心赠款提供的资源的众多研究子项目之一。子项目和研究者（PI）可能已经从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。列出的机构是中心的，不一定是研究者的机构。本提案的目的是研究硫酸软骨素（CS）和硫酸皮聚糖（DS）蛋白多糖生物合成在动脉粥样硬化发生中的作用。当动脉粥样硬化病变在血管壁发生时，CS和DS蛋白聚糖，大聚糖，装饰素和桃聚糖积累。由于脂蛋白在体外与蛋白聚糖结合，并在动脉粥样硬化病变中与它们共定位，因此有人假设，血管壁细胞中蛋白聚糖生物合成的增加是动脉粥样硬化的原因。Biglycan是一种可能的结合和保留脂蛋白的候选蛋白聚糖，因为它在体外结合致动脉粥样硬化脂蛋白，在人类动脉粥样硬化病变中与载脂蛋白B （apoB）和E （apoE）共定位，在小鼠病变中与载脂蛋白B和载脂蛋白E的共定位比decorin更紧密。此外，由于biglycan具有蛋白质和糖胺聚糖（GAG）介导的与其他蛋白质（如胶原、脂蛋白、tgf β）的相互作用，我们假设这些相互作用对血管壁病变的结构和发展很重要。为了验证这些假设，我们的三个目标集中在3种动物模型中测量和表征动脉粥样硬化。在具体目标1中，我们将确定内皮细胞增加的biglycan生物合成是否会夸大动脉粥样硬化的发展。在特定目标2中，我们将确定血管平滑肌细胞增加的多糖生物合成是否会加剧动脉粥样硬化的发展。在具体的目的3中，我们将确定biglycan的GAG修饰是否对动脉粥样硬化病变的发展和结构重要。将这三种小鼠模型与低密度脂蛋白受体缺乏或载脂蛋白E缺乏的小鼠杂交，使其具有动脉粥样硬化性。我们对这些小鼠动脉粥样硬化模型的目的是确定高聚糖生物合成和GAG修饰在动脉粥样硬化病变发生和进展中的作用。除了标准的动脉粥样硬化病变分析和广泛的组织学表征，包括不同胶原类型和多糖的免疫组织化学，活体显微镜和磁共振成像将用于表征这些小鼠的血管病理。总的来说，这些研究将更清楚地定义biglycan积累和biglycan GAG修饰在动脉粥样硬化发病机制中的作用。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The goal of this proposal is to investigate the role of chondroitin sulfate (CS) and dermatan sulfate (DS) proteoglycan biosynthesis in atherogenesis. As an atherosclerotic lesion develops in the blood vessel wall, CS and DS proteoglycans biglycan, decorin, and versican accumulate. Because lipoproteins bind in vitro to proteoglycans and co-localize with them in the atherosclerotic lesion, it has been hypothesized that increased proteoglycan biosynthesis by cells in the vessel wall is atherogenic. Biglycan is a likely candidate proteoglycan for binding and retaining lipoproteins since it binds atherogenic lipoproteins in vitro, colocalizes with apolipoprotein B (apoB) and E (apoE) in human atherosclerotic lesions, and more closely colocalizes with apoB and apoE in mouse lesions than decorin. Furthermore, because biglycan has both protein and glycosaminoglycan (GAG)-mediated interactions with other proteins (e.g. collagens, lipoproteins, TGFbeta), we hypothesize that these interactions are important to the structure and development of the lesion in the vascular wall. To test these hypotheses our three aims focus on measuring and characterizing atherosclerosis in 3 animal models, In specific aim 1, we will determine whether increased biosynthesis of biglycan by endothelial cells can exaggerate the development of atherosclerosis. In specific aim 2, we will determine whether increased biosynthesis of biglycan by vascular smooth muscle cells can exaggerate the development of atherosclerosis. In specific aim 3, we will determine whether the GAG modifications of biglycan are important for atherosclerotic lesion development and structure. All three mouse models will be made atherogenic by crossing them to either low-density lipoprotein receptor deficient or apolipoprotein E deficient mice. Our objectives with these mouse models of atherosclerosis are to determine the roles increased biosynthesis and GAG modification of biglycan have in atherosclerotic lesion development and progression. In addition to standard atherosclerotic lesion analysis and extensive histologic characterization including immunohistochemistry for different collagen types and biglycan, intravital microscopy and magnetic resonance imaging will be used to characterize the vascular pathology in these mice. Overall, these proposed studies will more clearly define the role biglycan accumulation and biglycan GAG modification have in the pathogenesis of atherosclerosis.