UFBP1, a key component in ufmylation, enhances drug sensitivity by promoting proteasomal degradation of oxidative stress-response transcription factor Nrf2.

Oncogene
Zhanhong HuGuoqiang Xu

Abstract

The key component in the UFM1 conjugation system, UFM1-binding and PCI domain-containing protein 1 (UFBP1), regulates many biological processes. Recently it has been shown that low UFBP1 protein level is associated with the worse outcome of gastric cancer patients. However, how it responses to the sensitivity of gastric cancer to chemotherapy drugs and the underlying molecular mechanism remain elusive. Here, we discovered that high UFBP1 expression increases the progression-free survival of advanced gastric cancer patients treated with platinum-based chemotherapy. Cell-line based studies unveiled that UFBP1 expression enhances while UFBP1 knockdown attenuates the sensitivity of gastric cancer cells to cisplatin. High-throughput SILAC-based quantitative proteomic analysis revealed that the protein level of aldo-keto reductase 1Cs (AKR1Cs) is significantly downregulated by UFBP1. Flow cytometry analysis showed that UFBP1 expression increases while UFBP1 knockdown reduces reactive oxygen species upon cisplatin treatment. We further disclosed that UFBP1 attenuates the gene expression of AKR1Cs and the transcription activity of the master oxidative stress-response transcription factor Nrf2 (nuclear factor erythroid-2-related factor ...Continue Reading

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Methods Mentioned

BETA
xenograft
flow cytometry
ubiquitination
transfection
surgical resection

Software Mentioned

FlowJo
OriginPro
Perseus
DAVID
ImageJ

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