Ikk2 regulates cytokinesis during vertebrate development

• Published in: Scientific reports 2017-08, Vol.7 (1), p.8094-12, Article 8094
• Main Authors: Shen, Hongyuan, Shin, Eun Myoung, Lee, Serene, Mathavan, Sinnakaruppan, Koh, Hiromi, Osato, Motomi, Choi, Hyungwon, Tergaonkar, Vinay, Korzh, Vladimir
• Format: Article
• Language: English
• Subjects: 14; 14/35; 38; 38/1; 45/22; 45/91; 631/136/334/1874/763; 631/208/135; 64; 64/116; 96; 96/1; Angiogenesis; Animals; Animals, Genetically Modified - metabolism; Animals, Genetically Modified - physiology; Blastoderm; Cell division; Cell Division - physiology; Cell proliferation; Cell Proliferation - physiology; Cytokinesis; Cytokinesis - physiology; Embryogenesis; Embryonic Development - physiology; Embryonic growth stage; Female; Gene Expression Regulation, Developmental - physiology; Humanities and Social Sciences; I-kappa B Kinase - metabolism; IKK2 protein; Innate immunity; Lethality; multidisciplinary; NF-kappa B - metabolism; NF-κB protein; Phosphorylation; Phosphorylation - physiology; Science; Science (multidisciplinary); Signal transduction; Signal Transduction - physiology; Tumorigenesis; Vertebrates; Vertebrates - metabolism; Vertebrates - physiology; Zebrafish
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-017-06904-7

NFκB signaling has a pivotal role in regulation of development, innate immunity, and inflammation. Ikk2 is one of the two critical kinases that regulate the NFκB signaling pathway. While the role of Ikk2 in immunity, inflammation and oncogenesis has received attention, an understanding of the role of Ikk2 in vertebrate development has been compounded by the embryonic lethality seen in mice lacking Ikk2. We find that despite abnormal angiogenesis in IKK2 zygotic mutants of zebrafish, the maternal activity of Ikk2 supports embryogenesis and maturation of fertile animals and allows to study the role of IKK2 in development. Maternal-zygotic ikk2 mutants represent the first vertebrates globally devoid of maternal and zygotic Ikk2 activity. They are defective in cell proliferation as evidenced by abnormal cytokinesis, nuclear enlargement and syncytialisation of a significant portion of blastoderm. We further document that reduced phosphorylation of Aurora A by Ikk2 could underlie the basis of these defects in cell division.