Science Signal:内皮-间充质转化破坏血管完整性,诱导Myc介导的代谢改变促进肾纤维化

2020-06-10 QQY MedSci原创

肾损伤激活调控EndMT的转录因子Twist和Snail,导致血管破裂。随之而来的组织缺氧又触发了肾小管上皮细胞中Myc诱导的代谢转变为糖酵解,最终导致肾纤维化和肾功能受损。内皮细胞Twist或Sna

中心点:

肾损伤激活调控EndMT的转录因子Twist和Snail,导致血管破裂。随之而来的组织缺氧又触发了肾小管上皮细胞中Myc诱导的代谢转变为糖酵解,最终导致肾纤维化和肾功能受损。

内皮细胞Twist或Snail缺陷、上皮细胞Myc缺陷或药理抑制糖酵解或Myc可预防损伤后发生肾纤维化及功能障碍。

摘要:

内皮间充质转化(EndMT)是一种细胞转分化程序,即内皮细胞在促成纤维刺激下,失去其部分内皮细胞的特性并获得间充质样特征。EndMT与胚胎形成、器官纤维化及肿瘤恶性进展等方面均关系密切。

肾实质持续损伤的情况下,肾毛细血管内皮细胞可发生EndMT。但EndMT在肾纤维化过程中的作用尚待探索。Lovisa等人发现在肾脏中,EndMT可触发组织和代谢改变,最终导致肾纤维化(Balzer和Susztak在研究中也观察到了这一现象)。在本研究中,Lovisa等人主要研究内皮细胞的转录因子Twist或Snail功能缺陷在肾纤维化过程中对EndMT的作用。

在两个不同的肾损伤/纤维化小鼠模型中,条件性敲除VE-cadherin+或Tie1+内皮细胞的Twist1(编码Twist)或Snail(编码Snail)可抑制EndMT的发生,改善肾纤维化。抑制EndMT可限制肾小管周围血管渗漏,减少组织缺氧,保护肾小管上皮细胞的健康和功能。

EndMT加剧缺氧,导致肾小管上皮细胞中的Myc丰度增多,糖酵解增强和脂肪酸氧化抑制。

药理抑制或上皮细胞特异性敲除肾小管上皮细胞的Myc基因可减缓肾纤维化、恢复肾实质功能和代谢稳定。

总而言之,该研究表明EndMT在肾毛细血管内皮细胞损伤刺激时的功能,强调了内皮-上皮细胞串扰在肾脏纤维化发展中的作用,且具有治疗干预的潜力意义。

原始出处:

Sara Lovisa,et al. Endothelial-to-mesenchymal transition compromises vascular integrity to induce Myc-mediated metabolic reprogramming in kidney fibrosis. Science Signaling 09 Jun 2020:Vol. 13, Issue 635, eaaz2597. DOI: 10.1126/scisignal.aaz2597

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    2021-01-09 yaanren
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    2021-04-12 楚秀娟
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    2020-06-12 guihongzh
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    2020-06-12 jichang

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人类基因组中多达18,000个假基因,其中三分之二能够被转录。越来越多的证据表明,假基因具有功能作用,能够潜在地调节蛋白质编码基因的转录水平及转录后水平。