肺高血压中血管细胞功能的新型调节剂SPARC
Christine Veith1, Ipek Vartürk-Özcan1, Magdalena Wujak1,2
1Excellence Cluster Cardio-Pulmonary Institute, University of Giessen and Marburg Lung Center, Member of the German Center for Lung Research (C.V., I.V-Ö., M.W., S.H., C-Y.W., F.K., S.K., A.P., M.G., O.P., M.B., M.H., J.W., F.C.W., K.M., K.S., H.G., K.T., A.Sydykov, A.G., W.S., F.G., H.A.G., R.T.S., N.S., N.W.), Justus-Liebig-University, Giessen, Germany.
在肺高血压 (PH) 的发展中,分泌的蛋白酸性和丰富的蛋白质 (SPARC) 起着关键作用. 针对成年小鼠的SPARC改善了心脏功能,这表明它对PH的治疗潜力.
科学领域:
- 心血管生物学
- 肺部医学
- 分子生物学
背景情况:
- 肺高血压 (PH) 是一种严重的疾病,其特征是肺血管重塑和肺动脉压升高.
- 慢性缺氧会诱导肺动脉光滑肌细胞 (PASMC) 的过度增殖和耐的肺微血管内皮细胞 (PMVEC),从而导致PH.
- 在小鼠中因低氧引起的PH在再次暴露于normoxia后是可逆的.
研究的目的:
- 确定参与PH肺血管重塑的新基因.
- 在PH的发病过程中研究分泌的酸性和丰富的蛋白质 (SPARC).
主要方法:
- 在正常氧,慢性缺氧和再氧化模型中对肺血管进行微阵列分析.
- 在人类异常性肺动脉高血压 (IPAH) 和小鼠缺氧肺组织中评估SPARC表达.
- 使用原始人类PASMC和PMVEC的体外研究.
- 在小鼠中使用腺相关病毒 (AAV) 介导的Sparc Knockdown的体内研究.
主要成果:
- 在小鼠和IPAH患者的PH发育过程中,Sparc在重新氧化过程中降低了调节,但在PH发育过程中升高了调节.
- SPARC诱导了PASMC的扩散,并作为PMVECs分泌的副因子.
- 在PH模型中,Sparc在成年小鼠中显著改善了血液动力学和心脏功能.
- 遗传性Sparc淘汰小鼠没有对低氧诱导的PH产生保护,这表明有反调节机制.
结论:
- 在小鼠中,SPARC与人类和缺氧引起的PH的发病有关.
- SPARC影响血管细胞功能,特别是促进PASMC的增殖.
- 针对SPARC,特别是通过成年PH模型的淘汰,证明了治疗潜力.
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