CEP131 Abrogates CHK1 Inhibitor-Induced Replication Defects and Is Associated with Unfavorable Outcome in Neuroblastoma

Autor: Verna Cázares-Ordoñez, Kiyohiro Ando, Takehiko Kamijo, Shinichi Kobayashi, Satoshi Wada, Tsugumichi Koshinaga, Hiroki Nagase, Makoto Makishima, Yusuke Suenaga, Atsushi Yokoyama
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Oncology, Vol 2020 (2020)
ISSN: 1687-8450
DOI: 10.1155/2020/2752417
Popis: Checkpoint kinase 1 (CHK1) plays a key role in genome surveillance and integrity throughout the cell cycle. Selective inhibitors of CHK1 (CHK1i) are undergoing clinical evaluation for various human malignancies, including neuroblastoma. Recently, we reported that CHK1i, PF-477736, induced a p53-mediated DNA damage response. As a result, the cancer cells were able to repair DNA damage and became less sensitive to CHK1i. In this study, we discovered that PF-477736 increased expression of MDM2 oncogene along with CHK1i-induced replication defects in neuroblastoma NB-39-nu cells. A mass spectrometry analysis of protein binding to MDM2 in the presence of CHK1i identified the centrosome-associated family protein 131 (CEP131), which was correlated with unfavorable prognosis of neuroblastoma patients. We revealed that MDM2 was associated with CEP131 protein degradation, whereas overexpression of CEP131 accelerated neuroblastoma cell growth and exhibited resistance to CHK1i-induced replication defects. Thus, these findings may provide a future therapeutic strategy against centrosome-associated oncogenes involving CEP131 as a target in neuroblastoma.
Databáze: OpenAIRE
Externí odkaz: