A circular intronic RNA ciPVT1 delays endothelial cell senescence by regulating the miR-24-3p/CDK4/pRb axis.
A circular intronic RNA ciPVT1 delays endothelial cell senescence by regulating the miR-24-3p/CDK4/pRb axis.
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环状内含子 RNA ciPVT1 通过调节 miR-24-3p/CDK4/pRb 轴延缓内皮细胞衰老
DOI:
10.1111/acel.13529
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发表时间:
2022-01
期刊:
影响因子:
7.8
通讯作者:
Xiong XD
中科院分区:
文献类型:
--
作者:
Min X;Cai MY;Shao T;Xu ZY;Liao Z;Liu DL;Zhou MY;Wu WP;Zhou YL;Mo MH;Xu S;Liu X;Xiong XD
Circular RNAs (circRNAs) have been established to be involved in numerous processes in the human genome, but their function in vascular aging remains largely unknown. In this study, we aimed to characterize and analyze the function of a circular intronic RNA, ciPVT1, in endothelial cell senescence. We observed significant downregulation of ciPVT1 in senescent endothelial cells. In proliferating endothelial cells, ciPVT1 knockdown induced a premature senescence‐like phenotype, inhibited proliferation, and led to an impairment in angiogenesis. An in vivo angiogenic plug assay revealed that ciPVT1 silencing significantly inhibited endothelial tube formation and decreased hemoglobin content. Conversely, overexpression of ciPVT1 in old endothelial cells delayed senescence, promoted proliferation, and increased angiogenic activity. Mechanistic studies revealed that ciPVT1 can sponge miR‐24‐3p to upregulate the expression of CDK4, resulting in enhanced Rb phosphorylation. Moreover, enforced expression of ciPVT1 reversed the senescence induction effect of miR‐24‐3p in endothelial cells. In summary, the present study reveals a pivotal role for ciPVT1 in regulating endothelial cell senescence and may have important implications in the search of strategies to counteract the development of age‐associated vascular pathologies. We characterized a novel circular intronic RNA ciPVT1, which originates from intron 4 of the PVT1 gene, was markedly reduced in senescent endothelial cells. Further functional and mechanistic investigations revealed that ciPVT1 may act as a competing endogenous RNA (ceRNA) to regulate CDK4 and its downstream gene by decoying miR‐24‐3p, thereby delaying endothelial cell senescence.
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