Pre-miRNA Hsa-Let-7a-2: a Novel Intracellular Partner of Angiotensin II Type 2 Receptor Negatively Regulating its Signals.

Pre-miRNA Hsa-Let-7a-2: a Novel Intracellular Partner of Angiotensin II Type 2 Receptor Negatively Regulating its Signals.
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Pre-miRNA Hsa-Let-7a-2:血管紧张素 II 2 型受体的新型细胞内伙伴,负调节其信号

DOI:
10.7150/ijbs.70455
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发表时间:
2022
影响因子:
9.2
通讯作者:
Cai, Jun
Cai, Jun
中科院分区:
生物学2区
文献类型:
--
作者:
Liu, Xiaoyan;Chen, Zhenzhen;Li, Shuangyue;Jin, Ling;Cui, Xiao;Cui, Changting;Deng, Yue;Gao, Qiannan;Fan, Luyun;Niu, Yaping;Wang, Wenjie;Cui, Chunmei;Zhong, Jiuchang;Cui, Qinghua;Geng, Bin;Cai, Jun

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G蛋白偶联受体(GPCR)是最大的药物靶标家族,其生物学功能取决于不同的配体和细胞内相互作用组。一些 microRNA (miRNA) 作为配体与 RNA 敏感的 Toll 样受体 7 结合,调节炎症反应,从而促进癌症或神经退行性疾病的发病机制。目前尚不清楚 miRNA 是否作为配体或细胞内相互作用组与血管紧张素 II (Ang II) 2 型受体 (AGTR2) 结合,血管紧张素 II (Ang II) 2 型受体 (AGTR2) 是心血管疾病中关键的保护性 GPCR。在这里,筛选与 AGTR2 结合的 miRNA,我们鉴定并确认前 miRNA hsa-let-7a-2 非竞争性结合 AGTR2 的细胞内第三环。从功能上讲,细胞内 hsa-let-7a-2 过表达抑制了 Ang II 诱导的 AGTR2 效应,例如 cAMP 降低、RhoA 抑制和含有 Src 同源 2 结构域的蛋白酪氨酸磷酸酶 1 的激活,而 hsa-let-7a-2 敲低则增强了这些效应。一致地,过表达的hsa-let-7a-2抑制AGTR2诱导的细胞的抗增殖、抗迁移和促凋亡以及肠系膜动脉的血管舒张。我们的研究结果表明 hsa-let-7a-2 是 AGTR2 的新型细胞内伴侣,可负调节 AGTR2 激活的信号。
G protein-coupled receptors (GPCRs) are the largest family of druggable targets, and their biological functions depend on different ligands and intracellular interactomes. Some microRNAs (miRNAs) bind as ligands to RNA-sensitive toll-like receptor 7 to regulate the inflammatory response, thereby contributing to the pathogenesis of cancer or neurodegeneration. It is unknown whether miRNAs bind to angiotensin II (Ang II) type 2 receptor (AGTR2), a critical protective GPCR in cardiovascular diseases, as ligands or intracellular interactomes. Here, screening for miRNAs that bind to AGTR2, we identified and confirmed that the pre-miRNA hsa-let-7a-2 non-competitively binds to the intracellular third loop of AGTR2. Functionally, intracellular hsa-let-7a-2 overexpression suppressed the Ang II-induced AGTR2 effects such as cAMP lowering, RhoA inhibition, and activation of Src homology 2 domain-containing protein-tyrosine phosphatase 1, whereas hsa-let-7a-2 knockdown enhanced these effects. Consistently, overexpressed hsa-let-7a-2 restrained the AGTR2-induced antiproliferation, antimigration, and proapoptosis of cells, and vasodilation of mesenteric arteries. Our findings demonstrated that hsa-let-7a-2 is a novel intracellular partner of AGTR2 that negatively regulates AGTR2-activated signals.
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发表时间: 2017-01-01
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