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• W2921455087 abstract "The administration of doxorubicin (DOX) is one of the first-line treatments of breast cancer. However, acquisition of resistance remains the major obstacle restricting the clinical application of DOX. MicroRNAs (miRNAs) are small, noncoding RNAs which play crucial role in epigenetic regulation. Recent studies have shown that miRNAs are associated with tumor chemoresistance. Here we aim to explore the role of miRNA-192-5p in resistance to DOX in breast cancer cells. Normal human breast epithelial cell line MCF-10A, breast cancer cell line Michigan Cancer Foundation-7 (MCF-7), and DOX-resistant breast cancer cell line MCF-7/ADR were used here. The expression of miR-192-5p was examined by qPCR, and the expression of peptidylprolyl isomerase A (PPIA) was examined by qPCR and Western blot. The effects of miR-192-5p overexpression on the sensitivity to DOX were confirmed by Methylthiazolyldiphenyl-tetrazolium bromide (MTT) and Annexin-V/PI assay. Downstream molecular mechanisms, including PPIA, BAD, CASP9, Bcl-2, and c-Jun N-terminal kinase (JNK) activation, were detected by Western blot and qPCR. Luciferase reporter assay was used to validate the association between miR-192-5p and PPIA. miR-192-5p was downregulated while PPIA was upregulated in MCF-7/ADR cells. Functionally, miR-192-5p overexpression increased sensitivity to DOX by promoting cell apoptosis. Mechanistically, miR-192-5p overexpression performed its function by activating JNK, augmenting BAD and caspase9 expression, and suppressing Bcl-2 and PPIA expression. Luciferase assay validated that PPIA was a direct target of miR-192-5p. miR-192-5p sensitizes breast cancer cells to DOX by targeting PPIA, suggesting that miR-192-5p might serve as a novel target for reversing DOX resistance and controlling breast tumor growth." @default.
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• W2921455087 date "2019-01-01" @default.
• W2921455087 modified "2023-10-15" @default.
• W2921455087 title "miRNA-192-5p impacts the sensitivity of breast cancer cells to doxorubicin via targeting peptidylprolyl isomerase A" @default.
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• W2921455087 doi "https://doi.org/10.1002/kjm2.12004" @default.
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