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Human Molecular Genetics Advance Access published online on May 10, 2008
Human Molecular Genetics, doi:10.1093/hmg/ddn142
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

ccm1 cell autonomously regulates endothelial cellular morphogenesis and vascular tubulogenesis in zebrafish

Benjamin M. Hogan1, Jeroen Bussmann1, Hartwig Wolburg2 and Stefan Schulte-Merker1,*

1 Hubrecht Institute-KNAW & University Medical Centre Utrecht, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands 2 Institut für Pathologie, Liebermeisterstr 8, 72076 Tübingen, Germany

* Author for correspondence: Dr Stefan Schulte-Merker Hubrecht Institute Uppsalalaan 8 3584 CT Utrecht The Netherlands Phone: (+31) 30 212 1800 Fax: (+31) 30 251 6464 Email: s.schulte{at}niob.knaw.nl

Received March 17, 2008; Revised May 6, 2008; Accepted May 6, 2008

Cerebral cavernous malformations (CCMs) are a prevalent class of vascular anomalies characterized by thin-walled clusters of malformed blood vessels in the brain. Heritable forms are caused by mutations in CCM1, CCM2 and CCM3 but despite the importance of these factors in vascular biology, an understanding of their molecular and cellular functions remains elusive. Here we describe the characterization of a zebrafish embryonic model of CCM. Loss of ccm1 in zebrafish embryos leads to severe and progressive dilation of major vessels, despite normal endothelial cell fate and number. Vascular dilation in ccm1 mutants is accompanied by progressive spreading of endothelial cells and thinning of vessel walls despite ultrastructurally normal cell-cell contacts. Zebrafish ccm2 mutants display comparable vascular defects. Finally, we show that ccm1 function is cell autonomous, suggesting that it is endothelial cellular morphogenesis that is regulated by CCM proteins during development and pathogenesis.


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