Abstract：
:Liver cancer is the sixth most prevalent cancer worldwide and the third leading cause of cancer-related deaths. Adriamycin (ADR) resistance, which often leads to the progression of malignant tumors, is a major treatment obstacle for liver cancer. It has been confirmed that miR-155-5p could reverse drug resistance in human breast cancer. However, the biological function of miR-155-5p in ADR-resistant liver carcinoma (HepG2/ADR) cells remains unclear. miR-155-5p and ATG5 expression was determined by RT-qPCR and western blot. In addition, MTT, flow cytometry, immunofluorescence staining, and western blotting were performed to evaluate the proliferation, apoptosis, and autophagy of liver cancer cells. Finally, the effect of miR-155-5p on the expression of autophagy-related 5 (ATG5) was analyzed by luciferase activity assay, western blot, and RT-qPCR. Our results showed that miR-155-5p was downregulated in HepG2/ADR cells. Increasing the expression of miR-155-5p enhanced the sensitivity of liver carcinoma cells to ADR and promoted apoptosis through inhibition of autophagy in vitro. In addition, the binding site between miR-155-5p and ATG5 was identified, and miR-155-5p could directly regulate ATG5. Finally, ATG5 partially rescued the effect of miR-155-5p on autophagy and the apoptosis of HepG2/ADR cells. In conclusion, our findings showed that miR-155-5p could reverse ADR resistance in liver cancer by targeting ATG5, which may function as a potential target for liver cancer treatment.
journal_name
Neoplasmajournal_title
Neoplasmaauthors
Yu Q,Xu XP,Yin XM,Peng XQdoi
10.4149/neo_2020_200106N17subject
Has Abstractpub_date
2021-01-01 00:00:00pages
87-95issue
1eissn
0028-2685issn
1338-4317pii
200106N17journal_volume
68pub_type
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