Abstract
Breast cancer is a prevalent global disease that requires the development of effective therapeutic approaches. The occurrence of 5-fluorouracil (5-FU) resistance in breast cancer is emerging, which urgently needs new way to overcome the obstacle. In this study, we validated that the expression of LINC00467 is up-regulated in the breast cancer patients and breast cancer cells. In addition, the high expression of LINC00467 is associated with the 5-FU resistance of breast cancer cells. Interestingly, LINC00467 induced the homologous recombination (HR) repair via promoting the expression of NBS1 in 5-FU resistant breast cancer cells. Furthermore, miR-205 was validated as a common target of LINC00467 and NBS1, indicating that LINC00467 may induce NBS1 via the miRNA-mRNA target. Importantly, we identified that XBP1, as a transcription factor, induced the expression of LINC00467, which resulted in the enhanced HR efficiency and 5-FU resistance. Silencing XBP1 sensitized the 5-FU resistant breast cancer cells to the 5-FU treatment, whereas the ectopic expression of LINC00467 abrogated the effect of XBP1 silencing. In conclusion, LINC00467 enhances the 5-FU resistance by inducing NBS1-mediated DNA repair. LINC00467 also mediates the function of XBP1 in 5-FU resistance in breast cancer cells.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by L.L, Y.Z, Y.Z and Y.Z. X.L supervised the study. The first draft of the manuscript was written by L.L and X.L, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The breast cancer tumor sample collection and experiments were approved by the Institutional Ethical Committee of Southwest Medical University with the issue number No. SMU19028.
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Li, L., Zhang, Y., Zhan, Y. et al. LINC00467 mediates the 5-fluorouracil resistance in breast cancer cells. In Vitro Cell.Dev.Biol.-Animal 60, 80–88 (2024). https://doi.org/10.1007/s11626-023-00832-9
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DOI: https://doi.org/10.1007/s11626-023-00832-9