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Sci Signal:挑战传统观点:ROS到底是促发还是抑制先兆子痫

2017-05-22 万纹 生物通

来自日本东北大学的研究人员通过小鼠实验提出了一个相反的观点:ROS可能通过增加胎盘中的血管生成,实际上有助于防止先兆子痫。这一研究成果公布在5月16日的Science Signaling杂志上。多达8%的孕妇会发生被称为先兆子痫的病症,这种疾病的特征是孕妇子宫血管收缩,阻碍给胎儿输送血液和氧气。之前的研究活性氧(ROS)在启动这种无法治疗的处境方面发挥了作用,由于先兆子痫在全球孕产妇死亡率高达15

来自日本东北大学的研究人员通过小鼠实验提出了一个相反的观点:ROS可能通过增加胎盘中的血管生成,实际上有助于防止先兆子痫。这一研究成果公布在5月16日的Science Signaling杂志上。

多达8%的孕妇会发生被称为先兆子痫的病症,这种疾病的特征是孕妇子宫血管收缩,阻碍给胎儿输送血液和氧气。之前的研究活性氧(ROS)在启动这种无法治疗的处境方面发挥了作用,由于先兆子痫在全球孕产妇死亡率高达15%,死胎率为5%,因此一些临床试验试图通过靶向ROS来降低先兆子痫的风险,但治疗后的结果并不理想,一些孕妇甚至会出现更糟糕的结果。

来自日本东北大学的研究人员通过小鼠实验提出了一个相反的观点:ROS可能通过增加胎盘中的血管生成,实际上有助于防止先兆子痫。这一研究成果公布在5月16日的Science Signaling杂志上。

文章作者,日本东北大学医学研究科分子生物学家Norio Suzuki表示,这一结果“与研究人员预期的完全相反”。早期的研究表明,在先兆子痫患者的胎盘中,ROS会出现积累,“然而这项研究的数据表明,先兆子痫小鼠模型中ROS积累能诱导胎盘血管生成,并改善了母亲和胎儿的状况”。

Suzuki等人利用基因修饰的小鼠,发现Keap1-Nrf2这一诱导解毒和抗氧化酶表达的途径“对于保护器官免受多种疾病的损害至关重要,”他解释说。由此他们希望了解这一系统是否也可能参与了先兆子痫。

结果发现在诱导先兆子痫的小鼠中使Keap1-Nrf2系统失活,会导致更高水平的ROS,但是出人意料的是,这些动物改善了血管形成。小鼠母亲及其胎儿的症状和死亡风险降低了。相反如果激活这一途径就会导致死亡率上升和流产率上升。

虽然ROS调节胎盘血管发生的分子机制尚不清楚,但Suzuki指出,这一结果表明,氧化应激对孕妇健康可能是很重要的,这种抗氧化系统未来有可能可以用于先兆子痫的治疗。

但来自伦敦国王学院的Guillermina Girardi却表示了针对Suzuki等人采用的小鼠模型的担忧,指出啮齿动物不一定与人体相同,前者不知道是否存在异常的滋养层细胞侵入母体子宫,而这被认为是先兆子痫特征高血压出现的主要原因。

对此,Suzuki也承认他和他的同事使用的小鼠模型的局限性,但也强调在先兆子痫的其它小鼠模型中检测ROS的重要性,他说:“使用动物模型的研究总存在局限性,不可能在一篇论文中解释关于动物模型的一切,”他说,“但没有我们的小鼠模型,ROS对先兆子痫的这种改善作用也不会被发现。”

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    2018-05-06 楚秀娟
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    2017-07-16 yaanren
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    2017-05-24 lsndxfj
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    2017-05-23 天涯183

    非常好的文章,学习了,很受益

    0

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    2017-05-22 天涯183

    非常好的文章,学习了,很受益

    0

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目前,加州大学洛杉矶分校(UCLA)Brigitte Gomperts博士带领的研究小组,发现了被认为是肺癌发展的第一阶段的过程的内部活动。这项研究解释了修复肺部组织的成人干细胞生长的调控因子,如何能够引发癌前期病变的形成。这项为期三年的研究,最终会带来新的个体化肺癌治疗方法。肺癌是一种致命的疾病,美国大约29%的癌症死亡是由肺癌引起。      

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2月27日,Journal of Molecular and Cellular Cardiology (《分子与细胞心脏学期刊》)在线发表了中国科学院上海生命科学研究院健康科学研究所杨黄恬研究组题为ROS generated during early reperfusion contribute to intermittent hypobaric hypoxia-afforded cardiopr

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