Circulation:间充质干细胞分泌外染色体抑制缺氧性肺动脉高压

2012-11-20 范伟伟 医学论坛网

  美国波士顿的一项研究表明,间充质干细胞来源的外染色体(MEX)可发挥对肺的多效性保护作用,并通过抑制过度增殖的信号通路阻止缺氧性肺动脉高压(HPH)的发生,包括缺氧诱导的Stat-3介导信号。研究于2012年11月2日在线发表于《循环》(Circulation)杂志。   在肺部,缺氧可诱发炎症反应,表现为选择性激活的巨噬细胞和促炎性介质水平的提高,这对于随后发展为缺氧性肺动脉高压(HPH)

  美国波士顿的一项研究表明,间充质干细胞来源的外染色体(MEX)可发挥对肺的多效性保护作用,并通过抑制过度增殖的信号通路阻止缺氧性肺动脉高压(HPH)的发生,包括缺氧诱导的Stat-3介导信号。研究于2012年11月2日在线发表于《循环》(Circulation)杂志。

  在肺部,缺氧可诱发炎症反应,表现为选择性激活的巨噬细胞和促炎性介质水平的提高,这对于随后发展为缺氧性肺动脉高压(HPH)至关重要。HPH疾病实验模型表明,间充质干细胞(MSC)移植可抑制肺部炎症,血管重塑和右心衰竭,并最终逆转HPH。该研究旨在评价骨髓间充质干细胞的旁分泌机制是否对HPH具有保护作用。

  研究通过分离小鼠MSC的条件培养基,在小鼠HPH模型体内,识别影响体内缺氧信号的生物活性成分,并确定外染色体、分泌膜微泡是否能够抑制巨噬细胞浸润和促炎症、促增殖介导因子(包括单核细胞趋化蛋白-1和缺氧诱导促生长因子)的激活。

  结果表明,静脉输注的MSC来源的外染色体(MEX)能够抑制血管重构和HPH,而MEX-剥夺的培养基或成纤维细胞来源的外染色体并无影响。MEX抑制缺氧活化的信号转导和转录激活因子3和上调的miR-17家族的microRNA簇。同时,MEX可导致肺部miR-204的表达水平增加,miR-204作为一种关键的microRNA,在PH患者体内表达下降。人脐带间充质干细胞产生的MEX,可抑制人离体肺动脉内皮细胞信号转导和转录激活因子3的信号转导,表明MEX对缺氧血管细胞的直接影响。

  链接:

Lee C, Mitsialis SA, Aslam M, Vitali SH, Vergadi E, Konstantinou G, Sdrimas K, Fernandez-Gonzalez A, Kourembanas S.Exosomes Mediate the Cytoprotective Action of Mesenchymal Stromal Cells on Hypoxia-Induced Pulmonary Hypertension.Circulation. 2012 Nov 2


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    2013-05-04 gwc392
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