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J Thorac Cardiov Sur:心脏病患者的福音:科学家发现Gata4或可还你一颗健康的心脏!

2017-08-16 sunshine2015 来宝网

心脏病发作时,血液停止流入心脏; 缺乏氧气,心脏肌肉的一部分死亡。心肌不再生;而是用死亡组织替代由称为成纤维细胞的细胞形成的伤口,这些细胞不能帮助心脏泵。心脏减弱大多数患有严重心脏病发作的人会发展心力衰竭,这仍然是心脏病死亡的主要原因。

【Gata4如何帮助修补破碎的心脏】心脏病发作时,血液停止流入心脏; 缺乏氧气,心脏肌肉的一部分死亡。心肌不再生;而是用死亡组织替代由称为成纤维细胞的细胞形成的伤口,这些细胞不能帮助心脏泵。心脏减弱大多数患有严重心脏病发作的人会发展心力衰竭,这仍然是心脏病死亡的主要原因。

贝勒医学院外科副教授Megumi Mathison博士说:“我们最重要的目标是治疗心脏病发作的心脏衰竭。 “我们的方法是通过将疤痕组织重新编程到心肌细胞来恢复心脏功能。

在贝勒医学院教授兼分子和细胞生物学教授Todd K. Rosengart博士领导的心脏再生实验室中,一组研究人员表明,用转录因子Gata4,Mef2c和Tbx5(GMT)导致较少的瘢痕组织或纤维化,并且在该疾病的小动物模型中心脏功能增加高达50%。

该结果被认为主要是将心脏成纤维细胞重新编程成心肌细胞样细胞的结果。有趣的是,Rosengart团队注意到减少的纤维化和改善的心脏功能远远超过诱导的新的心肌细胞样细胞的程度。 Rosengart说:“这一观察表明存在未开发和未优化的基础机制。”

Gata4的新角色

“我们和其他人已经描述说,除了诱导成纤维细胞再编程成心肌细胞样细胞外,GMT鸡尾酒还诱发了心脏病发作纤维化的减少,”Mathison说。 “但是,对后者没有太多的关注。”

研究小组更详细地调查了GMT鸡尾酒如何激活减少纤维化的机制。他们发现了第一个证据,在GMT鸡尾酒的三个组成部分,只有Gata4能够减少心脏病发作纤维化,并改善大鼠心脏病发作模型的心脏功能。

介导这种新效应的分子机制的进一步探索表明,实验室中给予大鼠成纤维细胞的Gata4导致了蜗牛主要纤维化基因的表达降低。

“Gata4在心脏再生中起着复杂的作用:作为GMT鸡尾酒的一部分,它有助于将成纤维细胞重新编程成心肌细胞样细胞;我们知道它有助于心脏肥大 - 心脏扩大的发展 - 现在我们发现它可以减轻心脏纤维化,“Mathison说。 “其他人报道说,Gata4也可以抑制肝纤维化,在将这些发现转移到临床之前还有很多工作要做,但它们是重要的第一步。”

原始出处:Megumi Mathison,  Vivek P. Singh,  Deepthi Sanagasetti, et al. Cardiac reprogramming factor Gata4 reduces postinfarct cardiac fibrosis through direct repression of the profibrotic mediator snail. J Thorac Cardiovasc Surg. 2017 Jun 21.

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    2018-06-04 yyj062
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    2017-08-18 bbjsj_1981
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    2017-08-17 明天会更好!

    看看学习一下知识!

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