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MiRNA expression profile in hepatocellular carcinoma patient paired tissues

ABSTRACT: This study aimed to identify differential expression of miRNAs in hepatocellular carcinoma patient tissues and explore the function of miRNAs acting as sponge of circRNAs.

ORGANISM(S): Homo sapiens

PROVIDER: GSE156087 | GEO | 2021/06/07

REPOSITORIES: GEO

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A Mammalian Conserved Circular RNA CircLARP2 Regulates Hepatocellular Carcinoma Metastasis and Lipid Metabolism (Part 2)

Project description:Circular RNAs (circRNAs) have emerged as crucial regulators in physiology and human diseases. However, evolutionarily conserved circRNAs with potent functions in cancers are rarely reported. Here, we identified a mammalian conserved circRNA circLARP2 that played critical roles in hepatocellular carcinoma (HCC). With clinical specimens, we found that patients with high circLARP2 levels in HCC had advanced prognostic stage and poor overall survival. CircLARP2 facilitated HCC metastasis and lipid accumulation in HCC cell lines. CircLARP2 was one of the rare ones that were identified in HCC metastasis and conserved in mammals, which enabled further studies with animal models. CircLARP2-deficient mice exhibited reduced metastasis and less lipid accumulation in an induced HCC model. We provided lines of evidence at molecular, cellular, and whole organismal levels, to support that circLARP2 functioned as a protein sponge of AUF1. CircLARP2 sequestered AUF1 from binding to LKB1 mRNA, which led to decreased LKB1 mRNA stability and lower LKB1 protein levels. LKB1 as a kinase promoted the phosphorylation of AMPK and then the phosphorylation of ACC, the rate limiting enzyme of fatty acid synthesis. Knockdown of Lkb1 with AAV8-shLkb1 in mice HCC model also proved that Lkb1 was a key element in the regulation. Through this AUF1-LKB1-AMPK-ACC pathway, circLARP2 promoted HCC metastasis and lipid accumulation.

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Exosomal circRNA-MANBA mediates sorafenib resistance of hepatocellular carcinoma via miR-1290/CD109/p-STAT3 (Ser727) axis

Project description:Circular RNAs (circRNAs) are increasingly gaining importance and attention due to their diverse potential functions. Our study aims to explore the novel mechanisms by which exosome-contained circRNAs promote sorafenib resistance in hepatocellular carcinoma (HCC). Here we report that a circular RNA, circRNA-MANBA (a circular RNA upregulated in exosomes derived from sorafenib-resistant HCC cells), plays a significant role in sorafenib resistance in HCC. We identified that circRNA-MANBA is increased in sorafenib-resistant HCC cells, their exosomes, and tumor samples from sorafenib-treated HCC patients. Depletion of circRNA-MANBA substantially increases the cell-killing ability of sorafenib. Co-culture experiments revealed that exosomes from sorafenib-resistant HCC cells carrying large amounts of circRNA-MANBA could transmit drug resistant capacity to parental cells. Further studies revealed that circRNA-MANBA acted as ‘miRNAs sponge’ to absorb miR-1290, which prevented miR-1290 interaction with CD109 and thus upregulated STAT3 phosphorylation subsequently. Using different HCC mouse models, we demonstrated that silencing circRNA-MANBA by injection of siRNA could substantially overcome sorafenib resistance. Our study provides a proof-of-concept demonstration for a potential strategy to overcome sorafenib resistance in HCC patients by targeting circRNA-MANBA.

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