Constitutively active endothelial Notch4 causes lung arteriovenous shunts in mice.

American Journal of Physiology. Lung Cellular and Molecular Physiology
Doug MiniatiRong A Wang

Abstract

Lung arteriovenous (AV) shunts or malformations cause significant morbidity and mortality in several distinct clinical syndromes. For most patients with lung AV shunts, there is still no optimal treatment. The underlying molecular and cellular etiology for lung AV shunts remains elusive, and currently described animal models have insufficiently addressed this problem. Using a tetracycline-repressible system, we expressed constitutively active Notch4 (Notch4*) specifically in the endothelium of adult mice. More than 90% of mice developed lung hemorrhages and respiratory insufficiency and died by 6-7 wk after gene expression began. Vascular casting and fluorescent microsphere analysis showed evidence of lung AV shunts in affected mice. Cessation of Notch4* expression reversed these pathophysiological effects. Assessment of the vascular morphology revealed enlarged, tortuous vessels in the lungs that resembled arteriovenous malformations. By using whole lung organ culture, we demonstrated the effects of constitutively active Notch4 on the lung vasculature to be a primary lung phenomenon. Together, our results indicate the importance of Notch signaling in maintaining the lung vasculature and offer a new, reliable model with which t...Continue Reading

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Citations

Jan 21, 2012·Science Translational Medicine·Patrick A MurphyRong A Wang
Apr 16, 2014·PloS One·Fumiaki ShikataHironori Izutani
Dec 4, 2014·Proceedings of the National Academy of Sciences of the United States of America·Patrick A MurphyRong A Wang
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