Cell Stem Cell:熊敬维/雷晓光/赵世民合作开发出促进心脏再生和治疗心梗的小分子鸡尾酒疗法

2022-04-14 “E药世界”公众号 “E药世界”公众号

该研究首次报道了5个小分子药物组合可以有效促进成年大鼠心脏再生,并且证明该药物组合对心肌梗塞有良好的治疗作用。

心血管疾病是威胁人类健康的头号杀手,其中急性心梗可导致心肌细胞大量死亡,而剩余的心肌再生能力有限,最终导致心脏纤维化和心力衰竭

目前临床上治疗心衰的方法只能部分缓解心梗患者的症状,无法从根本上解决心梗后心肌细胞大量丢失的问题,所以业界对心脏再生医学寄予厚望。目前心脏再生领域仍存在许多未解决的问题,如尚未找到成年哺乳动物心脏干细胞,心脏细胞移植效率低且容易引起心律失常,心脏纤维细胞转分化为心肌细胞效率低等。同时,研究发现斑马鱼和乳鼠的心脏损伤后主要通过诱导心肌细胞增殖实现原位心脏再生,但是成年哺乳动物心肌细胞增殖率非常低,导致心脏损伤后不能再生。

因此,提高成年哺乳动物内源性心肌细胞的增殖对心脏再生至关重要。然而目前已报道的基因、miRNAs、化学小分子等诱导哺乳动物心肌细胞增殖的手段存在效率低、容易引起心律失常、需要依赖病毒作为递送工具等不足,不能满足临床转化需求。

近日,京大学未来技术学院熊敬维教授、北京大学化学与分子工程学院雷晓光教授、复旦大学赵世民教授团队合作,在 Cell Stem Cell 期刊发表了题为:A small molecule cocktail promotes mammalian cardiomyocyte proliferation and heart regeneration 的研究论文。

该研究首次报道了5个小分子药物组合可以有效促进成年大鼠心脏再生,并且证明该药物组合对心肌梗塞有良好的治疗作用。

为了解决心脏再生重大难题,研究团队首先利用双荧光细胞周期报告系统FUCCI(标记有丝分裂S-G2-M期)和MADM(显示胞质分裂),以及一套高通量筛选系统,从化学小分子文库中筛选出13个能有效诱导心肌细胞进入细胞周期的小分子。

值得一提的是,除MCT1抑制剂外,单个小分子基本不能诱导心肌细胞胞质分裂。因此研究者将单个小分子两两组合后验证其药效,并结合数学模型预测促增殖效果最佳的小分子组合,进一步通过体内、体外实验验证发现由盐酸去氧肾上腺素(α-adrenergic receptor激动剂)、巴瑞克替尼(JAK抑制剂)、去氢骆驼蓬碱(DRYK抑制剂)、VO-Ohpic trihydrate(PTEN抑制剂)和AZD3965(MCT1抑制剂)组成的小分子组合5SM,可成功诱导成年大、小鼠和人的心肌细胞重新进入细胞周期并且发生胞质分裂。

随后研究人员建立大鼠心肌梗塞模型,发现5SM可显着改善成年大鼠心梗后的心脏功能,减少心脏纤维化面积。最后研究人员结合单细胞转录组测序(scRNA-seq)、ATAC-seq等组学和生物化学等技术,发现5SM诱导静止期的心肌细胞进入去分化状态,随后进入增殖状态;同时,5SM通过激活乳酸信号和mTOR通路,促进心肌细胞代谢由氧化磷酸化向糖酵解转换,最终诱导心肌细胞增殖和分裂(见下图)。

该研究在国际上首次发现促进心脏原位再生的全小分子药物组合,揭示了心脏再生领域新的细胞和分子机制,为临床转化提供了新的候选小分子药物及新技术。

北京大学熊敬维教授、雷晓光教授以及复旦大学赵世民教授为共同通讯作者。北京大学未来技术学院博士研究生杜建勇(已经毕业)和郑丽霞为共同第一作者,中科院遗传发育所屠强研究员和杨航、同济大学魏珂教授和冯梦颖、复旦大学杨万洁、北京大学朱小君副研究员、高芃博士、郭富生、梁如琪、白林鹭、王子豪等对本文做出了重要贡献。

原始出处:

Jianyong Du, et al. A small-molecule cocktail promotes mammalian cardiomyocyte proliferation and heart regeneration. Cell Stem Cell, 2022.

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    2022-08-16 维他命
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    2022-12-10 宋威
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    2022-04-13 qblt

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