Abstract
LIN9 functions to regulate cell mitotic process. Dysregulation of LIN9 expression is associated with development of human cancers. In this study we assessed the association of LIN9 expression with paclitaxel resistance and clarified the underlying mechanisms for the first time. LIN9 expression in breast cancer tissues was retrieved from publicly available online databases and statistically analyzed. Human TNBC cell lines MDA-MB-231 and MDA-MB-468 and their corresponding paclitaxel-resistant sublines 231PTX and 468PTX were used to assess the expression of LIN9 by qRT-PCR and Western blot, cell growth by cell counting, cell viability by MTS assay, and cell apoptosis by flow cytometry. The data showed that high LIN9 expression in breast cancer patients receiving chemotherapy was related to poor overall survival (OS). LIN9 expression was upregulated in paclitaxel-resistant TNBC cells compared to their parental cells. Knockdown of LIN9 or treatment of paclitaxel-resistant TNBC cells with a bromo- and extra-terminal domain inhibitor (BETi) JQ1 which also decreased LIN9 expression enhanced the sensitivity of paclitaxel-resistant TNBC cells to paclitaxel. Mechanistically, decreased LIN9 in resistant cell lines reduced tumor cell viability, promoted multinucleated cells formation and induced tumor cell apoptosis, potentially by directly regulating microtubule-binding protein CCSAP. In conclusion, high LIN9 expression contributed to poor clinical outcomes and paclitaxel resistance in TNBC and BETi, targeting LIN9 expression, could be a reversible drug for PTX-resistant TNBC patients.
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This work was supported by the National Natural Science Foundation of China (81672622, 81702630) and China Post-doctoral Science Foundation (2018M643331).
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Lai, H., Wang, R., Li, S. et al. LIN9 confers paclitaxel resistance in triple negative breast cancer cells by upregulating CCSAP. Sci. China Life Sci. 63, 419–428 (2020). https://doi.org/10.1007/s11427-019-9581-8
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DOI: https://doi.org/10.1007/s11427-019-9581-8