LncRNA TTN-AS1 intensifies sorafenib resistance in hepatocellular carcinoma by sponging miR-16-5p and upregulation of cyclin E1 - 19/12/20
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Graphical abstract |
Highlights |
• | Resistance of HCC cells under the treatment of Sorafenib has been gradually produced. |
• | LncRNA TTN-AS1 functioned as a sponge of miR-16-5p. |
• | Cyclin E1 was targeted by miR-16-5p. |
• | Sorafenib resistance in HCC could be regulated by TTN-AS1/miR-16-5p/Cyclin E1 axis via PTEN/Akt pathway. |
Abstract |
Drug resistance has always been an important problem affecting the therapeutic effect of hepatocellular carcinoma (HCC). To investigate the potential role of lncRNA TTN-AS1 in HCC cells with sorafenib (SOR) resistance, and explore the underlying pathways, quantitative real time polymerase chain reaction (qRT-PCR) was used to test the expression of TTN-AS1 in HCC tissues and cells. Then, the expression of TTN-AS1 was down-regulated by shRNA, the activity changes, apoptosis and related protein expression in HCC cells with/without SOR treatment were observed in succession. Expression levels of the downstream target of TTN-AS1, miR-16-5p were studied by dual-luciferase binding assay, cell proliferation, and western blotting analysis. Nude mice models of human HCC with TTN-AS1 gene knockdown were established to observe the tumor growth. As the results revealed, TTN-AS1 silencing in HCC cells induced apoptosis by enhancing the sensitivity of cells to SOR, and the tumor in nude mice became smaller. The mechanism study showed that miR-16-5p was affected by TTN-AS1 sponge, up-regulated cyclin E1 expression, and regulated PTEN/Akt signaling pathway, thereby significantly alleviating the inhibition of apoptosis of HCC cells induced by TTN-AS1 gene. Collectively, our results provided TTN-AS1 as a potential therapeutic target for sorafenib resistance in HCC.
El texto completo de este artículo está disponible en PDF.Keywords : Hepatocellular carcinoma, lncRNA TTN-AS1, Sorafenib, miR-16-5p, Resistance
Esquema
Vol 133
Artículo 111030- janvier 2021 Regresar al númeroBienvenido a EM-consulte, la referencia de los profesionales de la salud.
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