Abstract
The dissemination of cancer cells is one of the main reasons for treatment failure. During the process of establishing distant metastases, cancer cells must migrate through narrow environments, such as intercellular junctions, extracellular matrix, and basement membranes. The deformability of the cell nucleus is a limiting factor for migration through narrow environments; therefore, as the largest and hardest organelle, the nucleus is a key factor in crossing restrictive spaces. Nesprin-1/2 provides mechanical linkage between the nucleus and the cytoskeleton, but the specific mechanism by Nesprin-1/2 regulating tumor cell nuclear deformation is unclear. Our study found that knocking down Nesprin-1/2 significantly weakens cell migration ability, and knocking down Nesprin-1/2 makes the nucleus becoming more easily deformed. Meanwhile, the knockdown of Nesprin-1/2 leads to a decrease in Lamin A/C levels. To explore whether Lamin A/C protein undergoes degradation, we treated cells with caspase-6 inhibitor Z-VEID-FMK, autophagy inhibitor 3-methyladenine (3-MA), or broad-spectrum proteasome inhibitor MG132, and found that knockdown of Nesprin-1/2 led to the degradation of Lamin A/C via the proteasome pathway. Through immunofluorescence experiments, we observed F-actin distribution in the process of pore migration, and found that knockdown of Nesprin-1/2 weakened the pushing force of the nuclear tail, making it unable to propel the nucleus forward. In conclusion, this study demonstrates that Nesprin-1/2 regulates nuclear deformation and reorganizes the cytoskeleton, which together affects cell pore migration and provides a theoretical reference for the study of nuclear deformation mechanisms.
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Acknowledgements
This work is supported, in part or in whole, by the National Natural Science Foundation of China (32071304, U19A2006, 12132004, 11972111, 32171309, 12272086), the China Postdoctoral Science Foundation (2019T120821), the Sichuan Science and Technology Program (2023NSFSC1233, 2022NSFSC0048, 2022NSFSC0686, 2023YFSY0038), and the Joint Funds of Center for Engineering Medicine (ZYGX2021YGLH017).
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Qin, X., Chen, K., Wang, M. et al. Nesprin-1/2 facilitates breast cancer cell pore migration via nucleus deformation. Eur. Phys. J. Spec. Top. 232, 2739–2749 (2023). https://doi.org/10.1140/epjs/s11734-023-00930-5
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DOI: https://doi.org/10.1140/epjs/s11734-023-00930-5