期刊
MOLECULAR CANCER RESEARCH
卷 16, 期 10, 页码 1499-1511出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1541-7786.MCR-18-0269
关键词
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资金
- JSPS KAKENHI [JP24300327, JP25640086, JP16H04690]
- Project for Development of Innovative Research on Cancer Therapeutics (P-DIRECT)
- Program for Interdisciplinary Research in Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University
- Astellas Foundation for Research on Metabolic Disorders
- Yasuda Medical Foundation
- Princess Takamatsu Cancer Research Fund [14-24621]
- Daiwa Securities Health Foundation
- Kobayashi Foundation for Cancer Research
- Kobayashi International Scholarship Foundation
- Friends of Leukemia Research Fund
- Cooperative Research Project Program of Joint Usage/Research Center at the Institute of Development, Aging and Cancer, Tohoku University
- Research Program of the Smart-Aging Research Center, Tohoku University
BRCA1 functions as a tumor suppressor in DNA repair and centrosome regulation. Previously, Obg-like ATPase 1 (OLA1) was shown to interact with BARD1, a heterodimer partner of BRCA1. OLA1 binds to BRCA1, BARD1, and g-tubulin and functions in centrosome regulation. This study determined that overexpression of wild-type OLA1 (OLA1-WT) caused centrosome amplification due to centriole overduplication in mammary tissue-derived cells. Centrosome amplification induced by overexpression of the cancer-derived OLA1mutant, which is deficient at regulating centrosome number, occurred in significantly fewer cells than in that induced by overexpression of OLA1-WT. Thus, it was hypothesized that overexpression of OLA1 with normal function efficiently induces centrosome amplification, but not that of OLA1 mutants, which are deficient at regulating centrosome number. We analyzed whether overexpression of OLA1 missense mutants of nine candidate phosphorylation residues, three residues modified with acetylation, and two ATP-binding residues caused centrosome amplification and identified five missense mutants that are deficient in the regulation of centrosome number. Three of themdid not bind to BARD1. Two phosphomimetic mutations restored the binding to BARD1 and the efficient centrosome amplification by their overexpression. Knockdown and overexpression of BARD1 also caused centrosome amplification. BARD1 mutant reported in cancer failed to bind to OLA1 and rescue the BARD1 knockdown-induced centrosome amplification and reduced its centrosomal localization. Combined, these data reveal that the OLA1-BARD1 interaction is important for the regulation of centrosome number. Implications: Regulation of centrosome number by BRCA1/BARD1 together with OLA1 is important for the genome integrity to prevent tumor development. (C) 2018 AACR.
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