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• W4310055985 abstract "Acquired chemoresistance to proteasome inhibitors (PIs), such as bortezomib (BTZ), becomes an intractable obstacle in the management of multiple myeloma (MM) in the clinic, but the underlying mechanisms are still not well elucidated. In the current study, we established bortezomib-resistant (BR) myeloma cells and performed stable isotope labeling by amino acids in cell culture (SILAC) assay to screen profiled protein expression. The level of deoxyuridine triphosphatase (DUT), an important enzyme of nucleotide metabolism, increased in the BR MM cells. Retrospective analysis indicated patients with higher DUT expression had poorer responses to PI-based treatment and clinical outcomes. DUT knockdown by RNAi effectively minimized BTZ resistance in MM cells. Moreover, DUT knockdown was accompanied with the downregulation of proliferating cell nuclear antigen (PCNA), contributing to decelerating cell growth, as well as augmented apoptosis due to bortezomib treatment. In contrast, DUT overexpression in parental MM.1S and LP-1 cells enhanced BTZ resistance. Furthermore, acquired resistance to BTZ could trigger the modulation of mitochondrial metabolism and function, as evidenced by elevated expression of genes associated with mitochondrial metabolism, as well as altered oxygen consumption rate and adenosine triphosphate (ATP) production in BR MM cells. DUT inhibition partially attenuated mitochondrial modulation, and instead favored an early impairment of mitochondrial integrity upon BTZ exposure so as to restrict MM progression and overcome drug resistance to BTZ treatment both in vitro and in vivo. In conclusion, we unveiled previously unrecognized effects of DUT on acquired drug resistance of MM, thus manipulating DUT may be efficacious for sensitizing MM cells to PIs." @default.
• W4310055985 created "2022-11-30" @default.
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• W4310055985 date "2022-11-01" @default.
• W4310055985 modified "2023-09-23" @default.
• W4310055985 title "DUT enhances drug resistance to proteasome inhibitors via promoting mitochondrial function in multiple myeloma" @default.
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• W4310055985 doi "https://doi.org/10.1093/carcin/bgac071" @default.
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