Cell Signaling: Macrovascular Complications of Diabetes

描述（由申请人提供）：大多数糖尿病患者死于 由动脉粥样硬化引起的心血管疾病， 糖尿病驱动糖尿病加速动脉粥样硬化的因素仍然是 不太了解。我们最近对一种新的猪模型的研究表明，糖尿病 与脂质摄入量增加相结合，导致累积增加， 动脉平滑肌细胞（SMCs）的增殖， 动脉粥样硬化SMC增殖的增加伴随着 高血糖症和血浆甘油三酯水平升高。高葡萄糖水平 不足以诱导SMC增殖，但某些常见的脂肪酸 甘油三酯（油酸酯和亚油酸酯）刺激SMC增殖， 存在胰岛素样生长因子I（IGF-I）。我们认为糖尿病 导致病变中IGF-I和脂蛋白脂酶的量增加 脂蛋白脂肪酶将甘油三酯降解为游离脂肪酸， 与IGF-I协同作用以刺激SMC增殖的酸。我们的目标 今后五年要解决的问题是：1.做油酸和 亚油酸增强IGF-I对SMC的促生长作用？2.怎么 油酸和亚油酸与IGF-I的促生长作用协同作用， SMC？3.载脂巨噬细胞产生的脂蛋白脂酶是否增加 平滑肌细胞增殖通过产生油酸和亚油酸？4.葡萄糖或脂质 与糖尿病相关的刺激SMC增殖，脂蛋白脂酶和 IGF-I在动脉粥样硬化病变中的表达及巨噬细胞源性的缺乏 脂蛋白脂酶导致SMC增殖减少？我们将使用几个 糖尿病相关动脉粥样硬化的动物模型，分离的动脉SMC 用于信号转导研究以及单核细胞的共培养模型 衍生的巨噬细胞和SMC。增加对SMC调节的了解 在糖尿病动脉粥样硬化病变中的增殖和积累可能 提供必要的基础信息，用于开发高度特异性的 可预防病变进展和易损病变形成的药物 可能导致心血管并发症的临床症状 在糖尿病中。

DESCRIPTION (provided by applicant): A majority of people with diabetes die of cardiovascular disease caused by atherosclerosis that is accelerated by diabetes. The factors that drive diabetes-accelerated atherosclerosis are still poorly understood. Our recent studies on a new porcine model show that diabetes in combination with elevated lipid intake causes increased accumulation and proliferation of arterial smooth muscle cells (SMCs) in lesions of atherosclerosis. The increased SMC proliferation occurs concomitant with hyperglycemia and elevated levels of plasma triglycerides. High glucose levels are not sufficient to induce SMC proliferation, but certain fatty acids common in triglycerides (oleate and linoleate) stimulate SMC proliferation in the presence of insulin-like growth factor I (IGF-I). We propose that diabetes leads to an increased amount of IGF-I and of lipoprotein lipase in lesion macrophages, and that lipoprotein lipase degrades triglycerides into free fatty acids that act in synergy with IGF-I to stimulate SMC proliferation. Our goal for the next five years is to address the following questions: 1. Do oleate and linoleate enhance the growth-promoting effects of IGF-I on SMCs? 2. How do oleate and linoleate synergize with the growth-promoting action of IGF-I in SMCs? 3. Does lipoprotein lipase produced by lipid loaded macrophages increase SMC proliferation by generating oleate and linoleate? 4. Does glucose or lipids associated with diabetes stimulate SMC proliferation, lipoprotein lipase and IGF-I in lesions of atherosclerosis and does lack of macrophage-derived lipoprotein lipase result in reduced SMC proliferation? We will use several animal models of diabetes-associated atherosclerosis, isolated arterial SMCs for signal transduction studies as well as a co-culture model of monocyte derived macrophages and SMCs. Increased understanding of the regulation of SMC proliferation and accumulation in diabetic lesions of atherosclerosis may provide the basis information necessary for development of highly specific drugs that can prevent lesion progression and formation of vulnerable lesions that are likely to cause the clinical symptoms of cardiovascular complications in diabetes.