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在南极冰鱼中鉴定了两个调节心肌细胞增殖的miRNAs

Qianghua Xu^1,2, Ruonan Jia¹, Fei Yang¹

¹Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China.

|June 28, 2024

概括

南极冰鱼由于缺乏血红蛋白,心脏很大. 研究人员发现,特定的microRNAs (miRNAs) 通过准骨形态遗传蛋白-2 (BMP2) 信号来调节心脏生长,从而提供了对缺氧诱导的心脏重塑的见解.

科学领域:

心血管生物学心血管生物学
发展生物学发展生物学
基因组学就是基因组学.

背景情况:

南极冰鱼拥有扩大的心脏,以弥补由于缺乏血红蛋白而导致的低氧承载能力.
这种独特的适应性使它们成为研究心脏发生和心脏重塑的有价值模型.

研究的目的:

研究微RNAs (miRNAs) 和骨形态遗传蛋白 (BMP) 信号在南极冰鱼心脏扩大发育中的作用.
为了确定参与缺氧诱导的心脏重塑的特定miRNAs.

主要方法:

在冰鱼和红血型notothenioids之间进行比较miRNAome和转录组分析.
Knockdown 实验用于评估已识别的 miRNAs 在心脏发育中的功能.
验证miRNA-目标相互作用和信号通路激活.

主要成果:

在冰鱼心脏中观察到BMP信号通路因子的显著上调和改变的miRNA表达.
在冰鱼中发现了14种特定miRNA的下调,发现miR-458-3p和miR-144-5p对于心脏扩大发育至关重要.
这些miRNAs向骨形态遗传蛋白-2 (BMP2),调节心肌细胞增殖.
过低的暴露被证明可以激活鱼心中的miRNA-BMP2信号传递.

结论:

特定的miRNAs在南极冰鱼中缺氧诱导的心脏重塑中发挥着关键作用.
鉴定到的miRNA-BMP2信号通路为心肌细胞在适应低氧环境的过程中对心肌细胞增殖的调节提供了新的见解.

关键词:

细胞生物学细胞生物学进化生态学的进化生态学分子生物学分子生物学

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相关概念视频

MicroRNAs

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...