期刊
EBIOMEDICINE
卷 40, 期 -, 页码 92-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ebiom.2019.01.002
关键词
QCR2; Tumorigenesis; p53; Degradation; PHB; Senescence
资金
- 973 Program of China [2015CB553903]
- National Science-technology Supporting Plan Projects [2015BAI13B05]
- National Natural Science Foundation of China [81702573, 81772787, 81402159, 81472783, 81372806, 81372801, 81572570]
- National Science and Technology Major Sub-Project [2018ZX10301402-002]
- Technical Innovation Special Project of Hubei Province [2018ACA138]
Background: Ubiquinol-cytochrome C reductase core protein II (QCR2) is essential for mitochondrial functions, yet, its role in cancer development has remained elusive. Methods: The expression of QCR2 in cancer patients was assessed by immunohistochemistry. The proliferation of cancer cells was assessed by CCK-8 assay, EdU staining and Flow cytometry analysis. The biological function of QCR2 and PHB were determined using western blotting, RT-qPCR, microarray analysis and xenografts. The interactions between proteins and the ubiquitination of p53 were assessed by immunoprecipitation, mass spectrometry analysis and GST pull down. The subcellular location of PHB and QCR2 was assessed by immunoblotting and immunofluorescence. Finding: The expression of QCR2 is upregulated in multiple human tumors. Suppression of QCR2 inhibits cancer cell growth by activating p53 signaling and inducing p21-dependent cell cycle arrest and senescence. QCR2 directly interacts with PHB in the mitochondria. Overexpression of QCR2 inhibits PHB binding to p53 in the nucleus, and facilitates p53 ubiquitination and degradation, consequently leading to tumorigenesis. Also, increased QCR2 and decreased PHB protein levels are well correlated with decreased expression of p21 in cervical cancer tissues. Interpretation: These results identify a novel role for QCR2, together with PHB, in negative regulation of p53 stability and activity, thus promote cervical carcinogenesis. (c) 2019 Published by Elsevier B.V.
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