CD1-restricted T cell response in atherosclerosis

描述（由申请人提供）： 分化簇I（CD 1）蛋白代表了一类新的分化簇。 抗原呈递分子，其结构类似于MHC I类 抗原，并可能限制某些T淋巴细胞对脂质的反应 抗原有两组CD 1分子由5个CD 1 基因（CD 1a、B、c、d和e）。动脉粥样硬化病变含有大量T 细胞和CD 1阳性巨噬细胞和树突状细胞， 化学修饰的脂质（例如，胆固醇氧化物或氧固醇， 氧化磷脂）存在于氧化脂蛋白中， CD 1-限制性T细胞可能存在于病变中， 对局部巨噬细胞呈递的致动脉粥样硬化脂质抗原有反应， 树突状细胞本提案的具体目的是确定 (1)CD 1同种型表达和CD 1限制性T细胞对 动脉粥样硬化中氧化脂蛋白的脂质成分;（2） CD 1突变或多态性与血管病变的相关性 SLE和动脉粥样硬化患者的自身免疫;（3）细胞因子 CD 1d限制性NK T细胞的产生和促凋亡功能， 对脂质抗原有反应性;和（4）敲除CD 1d的影响 基因对T细胞对脂质抗原反应的影响， 由载脂蛋白E缺乏引起的动脉粥样硬化。实验 程序涉及T细胞细胞因子产生的分析， 抗原受体谱，T细胞对CD 1- 脂质复合物，CD 1基因的基因组DNA序列评估， 和动脉粥样硬化病变的组织病理学特征， 最近建立的CD 1/载脂蛋白E双敲除小鼠 我们的实验室预计该项目的完成将产生 有价值的信息，有助于了解免疫机制， 动脉粥样硬化形成过程中潜在的血管损伤。

DESCRIPTION (provided by applicant): The cluster of differentiation I (CD1) proteins represent a new class of antigen-presenting molecules, which structurally resemble MHC class I antigens and may restrict certain T lymphocyte responses to lipid antigens. There are two groups of CD1 molecules encoded by five CD1 genes (CD1a, b, c, d and e). Atherosclerotic lesions contain numerous T cells and CD1-positive macrophages and dendritic cells in addition to chemically modified lipids (e.g., cholesterol oxides or oxysterols and oxidized phospholipids) present in oxidized lipoproteins, raising the possibility that CD1-restricted T cells may exist in the lesions and respond to atherogenic lipid antigens presented by local macrophages and dendritic cells. The specific aims of this proposal are to determine (1) the CD1 isotype expression and CD1-restricted T cell response to lipid components of oxidized lipoproteins in atherosclerosis; (2) the association of an CD1 mutation or polymorphism with altered vascular autoimmunity in patients with SLE and atherosclerosis; (3) the cytokine production and pro-apoptotic function of CD1d-restricted NK T cells that are reactive to lipid antigens; and (4) the impact of knocking out CD1d gene on the T cell responses to lipid antigens and the development of atherosclerosis caused by apolipoprotein-E deficiency. The experimental procedures involve the analysis of T cell cytokine production and antigen receptor profiles, the evaluation of T cell response to CD1- lipid complexes, the assessment of genomic DNA sequences for CD1 genes, and the histopathological characterization of atherosclerotic lesions in the CD1/apolipoprotein-E double knockout mice recently established in our lab. Accomplishment of this project is anticipated to generate valuable information that help understand the immune mechanisms underlying vascular injury during atherogenesis.