Opposing Effects of Circadian Clock Genes Bmal1 and Period2 in Regulation of VEGF-Dependent Angiogenesis in Developing Zebrafish

Autor: Lasse Dahl Jensen, Ziquan Cao, Masaki Nakamura, Yunlong Yang, Lars Bräutigam, Patrik Andersson, Yin Zhang, Eric Wahlberg, Toste Länne, Kayoko Hosaka, Yihai Cao
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Cell Reports, Vol 2, Iss 2, Pp 231-241 (2012)
Druh dokumentu: article
ISSN: 2211-1247
DOI: 10.1016/j.celrep.2012.07.005
Popis: Molecular mechanisms underlying circadian-regulated physiological processes remain largely unknown. Here, we show that disruption of the circadian clock by both constant exposure to light and genetic manipulation of key genes in zebrafish led to impaired developmental angiogenesis. A bmal1-specific morpholino inhibited developmental angiogenesis in zebrafish embryos without causing obvious nonvascular phenotypes. Conversely, a period2 morpholino accelerated angiogenic vessel growth, suggesting that Bmal1 and Period2 display opposing angiogenic effects. Using a promoter-reporter system consisting of various deleted vegf-promoter mutants, we show that Bmal1 directly binds to and activates the vegf promoter via E-boxes. Additionally, we provide evidence that knockdown of Bmal1 leads to impaired Notch-inhibition-induced vascular sprouting. These results shed mechanistic insight on the role of the circadian clock in regulation of developmental angiogenesis, and our findings may be reasonably extended to other types of physiological or pathological angiogenesis.
Databáze: Directory of Open Access Journals