Open Access
ARTICLE
Reactive Oxygen Species-Mediated Cezanne Inactivation by Oxidation of its Catalytic Cysteine Residue in Hepatocellular Carcinoma
Zhongyuan Yin*, Lin Yang†, Feng Wu‡, Jinshuo Fan‡, Juanjuan Xu‡, Yang Jin‡, Guanghai Yang§
* Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
† Oncology Department, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
‡ Department of Respiratory Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology,
Wuhan, P.R. China
§ Department of Thoracic Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology,
Wuhan, P.R. China
Oncology Research 2019, 27(9), 1069-1077. https://doi.org/10.3727/096504019X15566157027506
Abstract
Cysteine oxidation occurs at the active site of deubiquitinases (DUBs) during many biologic signaling cascades. Here we report that hepatocellular carcinoma cells (HCCs) generated higher levels of endogenous
reactive oxygen species (ROS). This elevated ROS production was inhibited by NADPH oxidase inhibitor
diphenylene iodonium (DPI) and mitochondria electron chain inhibitor rotenone in HCC cells. Moreover, we
found that H2O2 could activate NF- B-dependent inflammatory effect through increased induction of matrix
metalloproteinase 2 (MMP2), MMP9, and intercellular adhesion molecule 1 (ICAM1) expression levels. In
addition, we found that H
2O
2 could prolong NF- B activation by suppressing the negative regulatory functions
of Cezanne in HCC cells. Ubiquitin-derived thiol-reactive probe (HA-UbVME) assay and biotin-tagged 1,3-
cyclohexadione derivative (DCP-Bio1) assay showed that H
2O
2 has the capacity to inhibit the catalytic activity of Cezanne, and the reducing agent, DTT, could reactivate the Cezanne deubiquitinating enzyme activity.
Taken all together, these findings demonstrated an important role for oxidation of Cezanne by ROS in regulation of the inflammatory effect of hepatocellular carcinoma.
Keywords
Cite This Article
Yin, Z., Yang, L., Wu, F., Fan, J., Xu, J. et al. (2019). Reactive Oxygen Species-Mediated Cezanne Inactivation by Oxidation of its Catalytic Cysteine Residue in Hepatocellular Carcinoma.
Oncology Research, 27(9), 1069–1077. https://doi.org/10.3727/096504019X15566157027506