Journal
ONCOTARGET
Volume 7, Issue 45, Pages 73257-73269Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.12304
Keywords
sorafenib; hepatocellular carcinoma; drug resistance; LncRNA; miRNA
Categories
Funding
- National Natural Scientific Foundation of China [81272467, 81472321, 8140101137]
- General Financial Grant from China Postdoctoral Science Foundation [2016M591564]
- Scientific Fund for Youths [QC2013C098, QC2013C103]
- Postdoctoral Scientce Foundation [LBH-Q13118]
- Natural Scientific Foundation of Heilongjiang Province [H201307]
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Sorafenib resistance remains a major obstacle for the effective treatment of hepatocellular carcinoma (HCC), and a number of miRNAs contribute to this resistance. However, the regulatory networks of miRNAs are very complex, thus inhibiting a single miRNA may sequentially activate other compensatory pathways. In the present study, we generated an artificial long non-coding RNA (AlncRNA), which simultaneously targets multiple miRNAs including miR-21, miR-153, miR-216a, miR-217, miR-494 and miR-10a-5p. These miRNAs have been shown to be upregulated in sorafenib-resistant cells and participate in the mechanisms underlying sorafenib resistance. The AlncRNA contains tandem sequences of 6 copies of the complementary binding sequences to the target miRNAs and is expressed by an adenoviral vector (Ad5-AlncRNA). Infection of Ad5-AlncRNA into sorafenib-resistant HCC cells blocked the function of miRNAs, and sequentially inhibited the downregulation of PTEN and activation of AKT. Ad5-AlncRNA significantly inhibited proliferation and induced apoptosis of sorafenib-resistant cells and enhanced the effects of sorafenib in vitro and in animal models. Inhibition of autophagy decreased the sensitivity of sorafenib-resistant cells to Ad5-AlncRNA, while its induction had the opposite effect. These results indicate that targeting multiple miRNAs by the artificial lncRNA could be a potential promising strategy for overcoming sorafenib resistance in the treatment of HCC.
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