PLoS One:血管平滑肌细胞分化标记基因表达中MRTF-A和Palladin的研究

2017-03-27 MedSci MedSci原创

血管平滑肌细胞(VSMC)在心血管疾病如动脉粥样硬化和再狭窄时从分化型转化为合成表型。之前的研究表明,转化生长因子-β(TGF-β)可通过来源于VSMC NADPH氧化酶4(Nox4)的活性氧(ROS)上调促分化基因平滑肌α-肌动蛋白(SMA)和钙结合蛋白Calponin(CNN)的表达来维持分化表型。近期美国埃默里的学者研究这一相互作用关系对疾病的影响,发表于PLoS One。大学本项研究中,作

血管平滑肌细胞(VSMC)在血管疾病如动脉粥样硬化和再狭窄时从分化型转化为合成表型。之前的研究表明,转化生长因子-β(TGF-β)可通过来源于VSMC NADPH氧化酶4(Nox4)的活性氧(ROS)上调促分化基因平滑肌α-肌动蛋白(SMA)和钙结合蛋白Calponin(CNN)的表达来维持分化表型。

近期美国埃默里的学者研究这一相互作用关系对疾病的影响,发表于PLoS One。大学本项研究中,作者发现Nox4和一种已知的平滑肌细胞标记基因调节中重要的转录因子心肌素相关转录因子-A(MRTF-A)之间的关系。之前研究表明,MRTF-A与肌动蛋白结合蛋白Palladin相互作用,尽管这种相互作用如何影响MRTF-A功能尚不清楚,磷酸化MRTF-A对其活性的作用也不清楚。

Rho激酶(ROCK)介导的MRTF-A磷酸化是VSMC中调节SMA和CNN的关键事件,并且该磷酸化取决于Nox4介导的Palladin蛋白表达。Nox4 siRNA可抑制TGF-β诱导的palladin表达和MRTF-A磷酸化,表明该信号通路为氧化还原敏感性的。敲除Palladin也降低MRTF-A磷酸化。这些数据表明Nox4依赖Palladin蛋白表达,ROCK调节MRTF-A的磷酸化,而MRTF-A是调节SRF表达的关键因素。

原始出处


Lee M, San Martín A.et al. Redox-Sensitive Regulation of Myocardin-Related Transcription Factor (MRTF-A) Phosphorylation via Palladin in Vascular Smooth Muscle Cell Differentiation Marker Gene Expression. PLoS One. 2016 Apr 18;11(4):e0153199.

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    2017-03-28 膀胱癌
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本研究表明这些较低比例但高可塑性VSMCs的广泛增殖可导致血管损伤后和动脉粥样硬化斑块中的VSMCs积聚。靶向治疗这些过度增殖的VSMCs可以有效地减少血管疾病而不影响血管完整性。

陶军:血管功能检测新理念

  血管内皮是位于血管壁和流动血液之间的单层扁平细胞,为血液提供平滑的物理表面。现代血管生物学研究认为,血管内皮除了完成血液和组织间的物质交换外,还产生和分泌多种生物活性物质,是机体最大的内分泌和旁分泌器官,其重量等同于肝脏。它产生和分泌的生物活性物质具有调节血管张力、抑制血管平滑肌细胞增生、抗血小板血栓形成、抑制炎症等作用,对维持正常血管结构和功能的完整具有十分重要的意义。   动脉硬化的始动