CircCEMIP promotes anoikis-resistance by enhancing protective autophagy in prostate cancer cells.

CircCEMIP promotes anoikis-resistance by enhancing protective autophagy in prostate cancer cells.
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DOI:
10.1186/s13046-022-02381-7
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发表时间:
2022-06-02
期刊:
Journal of experimental & clinical cancer research : CR
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环状rna (circRNAs)是各种恶性肿瘤发生发展的重要参与者。先前的研究表明,细胞迁移诱导蛋白(CEMIP)通过激活自噬来加速前列腺癌(PCa)的耐药(AR)。本研究主要探讨circCEMIP对前列腺癌转移的影响。本研究通过实时荧光定量PCR (quantitative real-time PCR, qRT-PCR)分析、western blotting、pull-down实验和双荧光报告基因实验,逐渐揭示了circ_0004585在PCa耐药中的作用。circ_0004585在体外和体内均能促进前列腺癌细胞的侵袭和转移。在机制上,circ_0004585直接与miR-1248相互作用,上调靶基因表达。此外,靶标预测和双荧光素酶报告基因检测鉴定跨膜9超家族成员4 (TM9SF4)是miR-1248的潜在靶标。通路分析显示,TM9SF4通过mTOR磷酸化激活自噬,促进PCa细胞耐药。这些结果表明circ_0004585通过靶向miR-1248/TM9SF4轴在PCa侵袭和转移过程中发挥了致癌作用,同时为转移性PCa的治疗策略开发提供了新的见解。在线版本包含补充材料,下载地址:10.1186/s13046-022-02381-7。
Circular RNAs (circRNAs) are essential participants in the development and progression of various malignant tumors. Previous studies have shown that cell migration-inducing protein (CEMIP) accelerates prostate cancer (PCa) anoikis resistance (AR) by activating autophagy. This study focused on the effect of circCEMIP on PCa metastasis. This study gradually revealed the role of circ_0004585 in PCa anoikis resistance via quantitative real-time PCR (qRT-PCR) analysis, western blotting, pull-down assays, and dual fluorescence reporter assays. Functionally, circ_0004585 promoted PCa cells invasion and metastasis both in vitro and in vivo. Mechanistically, circ_0004585 directly interacted with miR-1248 to upregulate target gene expression. Furthermore, target prediction and dual-luciferase reporter assays identified transmembrane 9 superfamily member 4 (TM9SF4) as a potential miR-1248 target. Pathway analysis revealed that TM9SF4 activated autophagy to promote PCa cells anoikis resistance via mTOR phosphorylation. These results demonstrated that circ_0004585 played an oncogenic role during PCa invasion and metastasis by targeting the miR-1248/TM9SF4 axis while providing new insight into therapeutic strategy development for metastatic PCa. The online version contains supplementary material available at 10.1186/s13046-022-02381-7.
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