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• W4322758580 abstract "Unlike other subtypes of breast cancer, triple negative breast cancer (TNBC) exhibits aggressive and metastatic behaviors and a lack of effective targeted therapeutics. (R)-9bMS, a small-molecule inhibitor of the non-receptor tyrosine kinase 2 (TNK2), significantly inhibited TNBC cell growth; however, the functional mechanism of (R)-9bMS in TNBC remains largely unknown.To explore the functional mechanism of (R)-9bMS in TNBC.Cell proliferation, apoptosis and xenograft tumor growth assays were performed to evaluate the effects of (R)-9bMS on TNBC. The expression levels of miRNA and protein were detected by RTqPCR or western blot, respectively. Protein synthesis was determined by analyzing the polysome profile and 35S-met incorporation.(R)-9bMS attenuated TNBC cell proliferation, induced cell apoptosis, and inhibited xenograft tumor growth. Mechanism study indicated that (R)-9bMS upregulated the expression of miR-4660 in TNBC cells. The expression of miR-4660 is lower in TNBC samples than that of the non-cancerous tissues. miR-4660 overexpression inhibited TNBC cell proliferation by targeting the mammalian target of rapamycin (mTOR), which reduced mTOR abundance in TNBC cells. Consistent with the downregulation of mTOR, exposure of (R)-9bMS inhibited the phosphorylation of p70S6K and 4E-BP1, which consequently interrupted the total protein synthesis and autophagy of TNBC cells.These findings uncovered the novel working mechanism of (R)-9bMS in TNBC by attenuating mTOR signaling via up-regulating miR-4660. The potential clinical significance of (R)- 9bMS in TNBC treatment is interesting to explore." @default.
• W4322758580 created "2023-03-03" @default.
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• W4322758580 date "2023-04-01" @default.
• W4322758580 modified "2023-09-25" @default.
• W4322758580 title "(R)-9bMS Inhibited the Protein Synthesis and Autophagy of Triple Negative Breast Cancer Cells via Regulating miR-4660/mTOR Axis" @default.
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• W4322758580 doi "https://doi.org/10.2174/0929866530666230302150750" @default.
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