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微RNA-34a调节心脏衰老和功能
Reinier A Boon1, Kazuma Iekushi, Stefanie Lechner
1Institute for Cardiovascular Regeneration, Centre of Molecular Medicine, Goethe University Frankfurt, 60590 Frankfurt, Germany.
Nature
|February 22, 2013
概括
老化的心脏显示微RNA-34a (miR-34a) 的增加,导致细胞死亡和功能障碍. 抑制miR-34a保护衰老的心脏,并通过向PNUTS改善心脏病发作后的恢复.
科学领域:
- 心血管生物学 心血管生物学
- 衰老研究研究 衰老研究
- 分子心脏病学分子心脏病学
背景情况:
- 衰老是心血管疾病的主要危险因素,急性心肌梗塞的结果恶化.
- 微RNAs (miRNAs) 是心血管功能和衰老的关键调节者.
- 在衰老过程中心脏miRNA表达的改变会导致功能衰退.
研究的目的:
- 研究改变miRNA表达在年龄相关心脏功能障碍中的作用.
- 确定miR-34a对心脏衰老和对心肌梗塞的反应的具体贡献.
主要方法:
- 在老年心脏中分析miRNA表达的分析.
- 在体内沉默和遗传删除miR-34a.
- 在心肌梗塞后评估心肌细胞细胞死亡,纤维化和心脏功能.
- 使用分子测试识别直接miRNA目标.
主要成果:
- 在衰老的心脏中诱导miR-34a.
- 抑制或删除miR-34a可以减少与年龄相关的心肌细胞死亡.
- 抑制miR-34a可以改善心脏功能,并减少心肌梗塞后的纤维化.
- PNUTS被确定为直接的miR-34a目标,对端粒长度和DNA损伤产生中介作用.
结论:
- 年龄诱导的miR-34a有助于心脏衰老和心肌梗塞后的不良结果.
- 针对miR-34a及其下游效应器PNUTS为与年龄有关的心血管疾病提供了治疗策略.
相关概念视频
01:22MicroRNAs
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...
01:22MicroRNAs
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 ends...
01:37Mitochondria
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...