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Circulation:DNMT3A介导的DNA甲基化在心肌代谢中的重要作用

2020-10-27 星云 MedSci原创

DNA甲基化是基因转录调控的重要机制。最近,DNA甲基化作为心肌肥大和心力衰竭的可能治疗靶点而受到关注。但其在心肌细胞中的确切作用仍存在争议。

DNA甲基化是基因转录调控的重要机制。最近,DNA甲基化作为心肌肥大和心力衰竭的可能治疗靶点而受到关注。但其在心肌细胞中的确切作用仍存在争议。

因此,Madsen等人通过CRISPR/Cas9基因编辑敲除了人诱导多能干细胞中的重要的甲基转移酶DNMT3A,以在调控和应激条件下评估DNA甲基化缺陷对人诱导多能干细胞来源的心肌细胞的功能影响。

DNMT3A敲除心脏组织的收缩动力学变化

结果发现,敲除人心肌细胞的DNMT3A对心肌细胞形态和功能有3个重要的影响:

DNMT3A敲除心脏组织的基因表达变化

1)与野生型相比,DNMT3A敲除心肌细胞的收缩蛋白相关基因的表达改变(如心房基因表达较高,MYH7/MYH6比降低)与心肌细胞的不同收缩动力学相关;

DNMT3A敲除心脏组织的形态变化(图B第3张图内的红色圆点即脂滴)

2)葡萄糖/脂代谢调节剂过氧化物酶体增殖物激活受体γ的异常激活与DNMT3A敲除心肌细胞内脂滴的积累有关;

敲除DNMT3A对糖代谢的影响

3)低氧诱导因子1α蛋白不稳定性与糖代谢受损和糖酵解酶表达降低有关,使DNMT3A敲除心脏组织对代谢压力(如停药和限制饮食)敏感。

综上所述,该结果表明,DNA甲基化在心肌细胞的正常稳态和心脏应激过程中起着重要作用,因此,DNA甲基化或可成为心脏治疗的一个潜在靶标。

原始出处:

Alexandra Madsen, et al. An Important Role for DNMT3A-Mediated DNA Methylation in Cardiomyocyte Metabolism and Contractility. Circulation. 2020;142:1562–1578

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    2020-10-30 咻凡

    DNA甲基化是基因转录调控的重要机制。

    0

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    2020-10-29 Lexi

    该结果表明,DNA甲基化在心肌细胞的正常稳态和心脏应激过程中起着重要作用,因此,DNA甲基化或可成为心脏治疗的一个潜在靶标。

    0

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    2020-10-29 zjubiostat
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    2020-10-27 Nebula-Qin

    DNMT3A,心脏治疗的潜在靶点

    0

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