lncRNA miat functions as a ceRNA to upregulate sirt1 by sponging miR-22-3p in HCC cellular senescence

lncRNA miat functions as a ceRNA to upregulate sirt1 by sponging miR-22-3p in HCC cellular senescence
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lncRNA miat作为ceRNA在HCC细胞衰老中通过海绵miR-22-3p上调sirt1

DOI:
10.18632/aging.102240
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发表时间:
2019-09
期刊:
AGING
影响因子:
--
通讯作者:
韩丽敏
韩丽敏
中科院分区:
其他
文献类型:
--
作者:
赵丽君;胡克新;曹建中;王攀;李俊;曾克武;何小东;屠鹏飞;童坦君;韩丽敏

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肝细胞癌(HCC)是癌症相关死亡的主要原因,缺乏有效的治疗方法。细胞衰老作为阻止癌症进展的屏障,在肿瘤抑制中起重要作用。衰老相关长链非编码RNA(SAL-RNA)被认为是癌症发展的关键调节因子。在这里,长链非编码RNA(lncRNA)心肌梗死相关转录物(miat)首次被鉴定为HCC特异性SALncRNA。miat的敲低显著促进细胞衰老并抑制HCC进展。机制研究表明,SAL-miat作为一种竞争性内源性RNA(ceRNA),通过吸收miR-22 - 3 p上调sirt1的表达。此外,miat下调激活了肿瘤抑制通路(p53/p21和p16/pRb),并刺激衰老癌细胞分泌衰老相关分泌表型(SASP),这有助于抑制肿瘤细胞增殖,从而导致肝癌发生的抑制。总之,我们的研究为miat作为HCC细胞衰老中的miRNA海绵的关键作用提供了机制见解,这可能为HCC治疗提供潜在的治疗策略。
Hepatocellular carcinoma (HCC) is a leading cause of cancer related deaths and lacks effective therapies. Cellular senescence acts as a barrier against cancer progression and plays an important role in tumor suppression. Senescence associated long noncoding RNAs (SAL-RNAs) are thought to be critical regulators of cancer development. Here, the long noncoding RNA (lncRNA) myocardial infarction-associated transcript (miat) was first identified as an HCC specific SALncRNA. Knockdown of miat significantly promoted cellular senescence and inhibited HCC progression. Mechanistic study revealed that SAL-miat acted as a competitive endogenous RNA (ceRNA) that upregulated the expression of sirt1 by sponging miR-22-3p. Moreover, miat downregulation activated the tumor suppressor pathway (p53/p21 and p16/pRb) and stimulated senescent cancer cells to secrete senescence-associated secretory phenotype (SASP), which contributed to inhibition of tumor cell proliferation, and resulted in the suppression of HCC tumorigenesis. Together, our study provided mechanistic insights into a critical role of miat as a miRNA sponge in HCC cellular senescence, which might offer a potential therapeutic strategy for HCC treatment.
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