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• W2301120951 abstract "Imatinib mesylate resistance occurs in some patients with gastrointestinal stromal tumors (GISTs) during the course of treatment. In this study, we investigated the relationship between microRNAs (miRNAs) and imatinib-resistant GISTs, and the effect of miR-518a-5p on PIK3C2A in imatinib-resistant GISTs. A total of 20 matched-pair GIST samples from imatinib-resistant patients were included in the study. Each of the paired tumor specimens were from the same patient who had surgical removal of GISTs preimatinib and postimatinib treatment. Seven pairs of tissues were resected for microarray analysis, and the remaining 13 pairs were utilized for miRNAs analysis. Target genes were selected based on bioinformatics from multiple biological databases. Luciferase reporter assays were used to confirm the binding of miR-518a-5p to PIK3C2A 3'UTR. GIST882R-NC, 882R-miR-518a-5p-OE, and 882R-miR-518a-5p-KD cell lines were constructed using lentiviral vectors. miR-518a-5p and PIK3C2A expression in 882R-NC, 882R-OE, and 882R-KD cells was assessed by real-time PCR and western blotting. A cell counting kit was used to detect the influence of miR-518a-5p to cell proliferation. TUNEL staining was applied to detect the influence of miR-518a-5p to cell apoptosis. Microarray analysis showed that miR-518a-5p was downregulated in imatinib-resistant GISTs, and the expression of miR-518a-5p was confirmed with good concordance between real-time PCR and miRNA microarray results. Luciferase reporter assays indicated that miR-518a-5p bound to the PIK3C2A 3'UTR. Compared with 882R-OE, PIK3C2A expression was significantly increased in 882R-KD cells. MiR-518a-5p reduced 882R proliferation and promoted 882R apoptosis. In conclusion, PIK3C2A is a gene-specific target of miR-518a-5p in imatinib mesylate-resistant GISTs. Low expression of miR-518a-5p is likely to upregulate PIK3C2A and affect the cellular response to the drug, causing resistance to imatinib in GISTs." @default.
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• W2301120951 date "2016-06-01" @default.
• W2301120951 modified "2023-09-28" @default.
• W2301120951 title "PIK3C2A is a gene-specific target of microRNA-518a-5p in imatinib mesylate-resistant gastrointestinal stromal tumor" @default.
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• W2301120951 doi "https://doi.org/10.1038/labinvest.2015.157" @default.
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