Work

Endoglin plays distinct roles in vascular smooth muscle cell recruitment and regulation of arteriovenous identity during angiogenesis

Year: 2009

Type: article

Abstract: Blood vessel formation is a multi-step process. Endoglin is a TGFbeta coreceptor required for angiogenesis. Endoglin null embryos exhibit a loss of arteriovenous identity and defective vascular smooth muscle cell (vSMC) recruitment. Haploinsufficiency of endoglin results in Hereditary Hemorrhagic Telangiectasia (HHT), characterized by a loss of arteriovenous identity and aberrant vSMC incorporation in fragile vessels. We explored a cell-autonomous role for endoglin in endothelial and vSMCs during angiogenesis by conditionally activating endoglin expression in wild type or endoglin null embryos using either smooth muscle (SM22alphacre) or endothelial cell (Tie2cre) promoters to partially rescue vSMC recruitment to the dorsal aorta. Examination of endoglin null embryos revealed ectopic arterial expression of the venous-specific marker COUPTFII. Endoglin re-expression in endothelial cells restored normal COUPTFII expression. These results suggested that endoglin plays distinct and cell-autonomous roles in vSMC recruitment and arteriovenous specification via COUPTFII in angiogenesis that may contribute to HHT.

Source: Developmental Dynamics

DOI: 10.1002/dvdy.22066

Authors: Maria L. Mancini, Aleksandra Terzic, Barbara A. Conley, Leif H. Oxburgh, Teodora Nicola, Calvin P.H. Vary

Institution: Maine Medical Center Research Institute

Language: English

Topic: Vascular Anomalies and Treatments

Subfield: Genetics (clinical)

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: green

Funders: Maine Medical Center Research Institute, National Institutes of Health, National Heart, Lung, and Blood Institute, National Center for Research Resources