Pulmonary hypertesnion is a common and serious clinical complication of connective tissue disease, which can easily cause patients right heart failure and death,but the pathogenesis is not clear, and till now there is no clinically effective treatment methods. Vascular remodeling is a key pathological mechanism of pulmonary hypertension, and we have found the chemokine CCL5 and its receptor(CCR5) mediates vascular remodeling, which may be associated with cold shock protein YB-1 regulation, but the specific regulation pathways and molecular mechanisms are not yet clear.Therefore, this project is to be based on existing research, through in vitro and in vivo experiments, study the vascular remodeling mechanisms of high expression of CCL5 induced by cold shock protein YB-1 regulation ,explore a new pathogenesis of connective tissue disease associated pulmonary hypertension, provide theoretical and experimental evidence for new targeted therapies.
肺动脉高压是结缔组织疾病常见且严重的临床并发症之一,极易引起患者发生右心衰竭和死亡,但发病机制尚不清楚,临床上无有效治疗方法。血管重塑是肺动脉高压的关键病理机制,我们前期研究已发现趋化因子CCL5及其受体(CCR5)能介导血管重塑,其病理作用可能与冷休克蛋白YB-1调控有关,但具体调控途径和分子机制尚不明确。因此,本项目拟在已有研究基础上,采用体内体外实验,系统研究冷休克蛋白YB-1调控CCL5高表达诱发血管重塑的作用机制,探索结缔组织疾病相关肺动脉高压发病的新机理,为研究发展新的靶向治疗提供理论与实验依据。
肺动脉高压是结缔组织疾病常见且严重的临床并发症之一,极易引起患者发生右心衰竭和死亡。血管重塑是肺动脉高压的重要病理机制。本课题采用体内体外实验,系统研究炎症因子与血管重塑之间的关系,探索结缔组织疾病相关肺动脉高压发病的新机制,并寻找新的预后因子。课题研究发现1)趋化因子CCL5及其受体CCR5在MCT-PAH大鼠模型肺动脉组织中高表达。2)CCL5受体拮抗剂能减轻肺动脉血管重塑。3) MCT-PAH大鼠肺组织中YB-1表达增加,可能参与调控CCL5的表达。4) 发现 CTD-PAH患者血清中VCAM-1及E-选择素、糖皮质激素诱导的肿瘤坏死因子受体家族相关蛋白配体(GITRL)水平升高,其中GITRL参与了肺动脉内皮的损伤机制,可作为 CTD-PAH新的预后因子。5)同时在结缔组织疾病患者中进行了探索性研究,发现mir203及穿孔素3与结缔组织疾病的发病相关,可作为临床应用的生物学标记之一。本研究虽未能证实 CCL-5或YB-1表达水平的增高可导致肺动脉内皮细胞活化或肺动脉平滑肌细胞增殖,但本实验发现CCL-5可促进巨噬细胞极化,提示CCL-5和YB-1可能是通过其他途径如促进巨噬细胞极化来参与结缔组织疾病相关肺动脉高压的发病过程。
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数据更新时间:2023-05-31
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