Opposing Effects of Circadian Clock Genes Bmal1 and Period2 in Regulation of VEGF-Dependent Angiogenesis in Developing Zebrafish
2012 (English)In: Cell Reports, ISSN 2211-1247, Vol. 2, no 2, 231-241 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Elsevier (Cell Press) , 2012. Vol. 2, no 2, 231-241 p.
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-85304DOI: 10.1016/j.celrep.2012.07.005ISI: 000309715100004OAI: oai:DiVA.org:liu-85304DiVA: diva2:570002
Funding Agencies|Swedish Research Council||Swedish Cancer Foundation||Karolinska Institute Foundation||Karolinska Institute||Tianjin Natural Science Foundation (CMM-Tianjin)|09ZCZDSF04400|Torsten Soderbergs Foundation||European Union|222741|European Research Council (ERC)|250021|2012-11-162012-11-152015-04-24Bibliographically approved