Abstract
Dual-specificity mitogen-activated protein kinase phosphatase-1 (MKP-1/DUSP1/CL-100) has been documented to promote breast cancer cell survival and chemoresistance. MKP-1 is an unstable protein that is ubiquitinated and degraded via the ubiquitin-proteasome system. However, it is not clear how MKP-1 protein stability is regulated in breast cancer. In this study, we performed a genome-wide siRNA library screen of deubiquitinases (DUBs) and identified STAMBPL1 as an MKP-1 DUB in breast cancer cells. STAMBPL1 interacts with MKP-1 and stabilizes MKP-1 via deubiquitination. Both STAMBPL1 and MKP-1 depletion sensitize breast cancer cells to cisplatin in vitro and in vivo, and ectopic overexpression of MKP-1 partially rescues STAMBPL1 depletion-induced cisplatin sensitivity. Furthermore, STAMBPL1 and MKP-1 depletion increased breast cancer sensitivity to cisplatin by increasing the phosphorylation and activation of c-Jun N-terminal protein kinase (JNK). Collectively, our findings not only identify STAMBPL1 as an MKP-1 DUB but also reveal a critical mechanism that regulates MKP-1 expression in breast cancer. Our findings indicate that the STAMBPL1/MKP-1 axis represents a potential therapeutic target in breast cancer.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China [2020YFA0112300 and 2018YFC2000400 to CC], National Natural Science Foundation of China [81772847, 82073270 and U1502222 to RL; 81572610 to JH; 81830087 and U2102203 to CC], a Shortage of Talent of Project in Guangdong Province, China [4YF16002G], Project of Innovative Research Team of Yunnan Province [2019HC005] and Yunnan Fundamental Research Projects (202001AW070018 and 202101AS070050).
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RL and CC designed the experiments. RL, GY, and MB carried out the experiments and analyzed the data. XJ and WL helped to perform the animal experiments. ZZ, XM, DZ, and XR provided technical support. RL wrote the manuscript, JH, RL, and CC revised the manuscript.
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Liu, R., Yang, G., Bao, M. et al. STAMBPL1 promotes breast cancer cell resistance to cisplatin partially by stabilizing MKP-1 expression. Oncogene 41, 2265–2274 (2022). https://doi.org/10.1038/s41388-022-02252-7
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DOI: https://doi.org/10.1038/s41388-022-02252-7
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