SCI TRANSL MED:lncNRA新发现为心肌梗死治疗的带来希望

2017-06-23 cailingrui MedSci原创

这项研究结果发现Wisper是一种心脏成纤维细胞富集超增强子相关的lncRNA,这可能是一个极具应用前景的治疗靶点,可有效减少心肌梗死后心肌纤维化的病理发展,并防止受损心脏的不良重塑。

心肌梗死或损伤的治疗通常集中在具有收缩性的心肌细胞上。然而,沉积在心肌成纤维细胞外的细胞外间质可以弥补心脏功能的减弱,在心力衰竭的发病机制中扮演重要角色。Micheletti等鉴定出一种叫做Wisper的超增强子相关长非编码RNA,它在心肌成纤维细胞中大量富集,并在心肌梗死的小鼠心脏组织中上调表达。在梗塞形成后,用Wisper的反义寡核苷酸治疗小鼠,当纤维化已经形成后,减少胶原蛋白和心脏应激标记的表达,减少组织重构,改善心脏的功能和存活。WISPER在主动脉瓣狭窄的患者组织样本中表达量增加,并且和胶原体积分数及纤维化程度相关。成纤维细胞特异性长非编码RNA可能是纤维化治疗的有力靶标。

长非编码RNA(lncRNA)在心脏发育和其他疾病中强有力的调节作用正慢慢浮现出来。然而,我们对于这些分子在心脏纤维化中起到何种重要作用的理解还非常有限。通过一项完整的基因组筛查,研究人员认定了Wisp2超增强子相关RNA Wisper是在损伤后,起到调节心脏纤维化作用的心脏成纤维细胞富集lncRNA。在心肌梗死(MI)的小鼠动物模型和患有主动脉瓣狭窄的病人心脏组织中,Wisper表达都与心肌纤维化紧密相关。通过修饰的反义寡核苷酸(ASO)进行功能缺失体外实验,结果表明Wisper是心肌成纤维细胞增殖,迁移和存活的特异性调节剂。相应的,ASO介导的Wisper体内沉默可以减轻由心肌梗死引起的纤维化和心脏功能障碍。在功能上,Wisper调控对细胞识别、细胞外基质沉积、增殖和存活至关重要的心肌成纤维细胞基因表达程序。此外,其与TIA1相关蛋白质的结合使其能够控制抗纤维化形式的赖氨酰羟化酶2的表达,涉及胶原交联和稳定基质。

这项研究结果发现Wisper是一种心脏成纤维细胞富集超增强子相关的lncRNA,这可能是一个极具应用前景的治疗靶点,可有效减少心肌梗死后心肌纤维化的病理发展,并防止受损心脏的不良重塑。

原始出处:
Rudi Micheletti. The long noncoding RNA Wisper controls cardiac fibrosis and remodeling. Sci Transl Med . 21 Jun 2017:Vol. 9, Issue 395, eaai9118
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    2018-06-03 仁心济世
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