Endoglin is a Novel Endothelial Cell Specification Gene

Overview

Journal Stem Cell Res

Publisher Elsevier

Specialty Cell Biology

Date 2011 Nov 22

PMID 22099023

Citations 13

Authors

Saswati Banerjee

Sujoy K Dhara

Methode Bacanamwo

Affiliations

Soon will be listed here.

Abstract

Endothelial cells (EC) are important in vasculogenesis and organogenesis during development and in the pathogenesis of cancer and cardiovascular diseases. However, few EC specification factors are known and primary EC production remains inefficient. Based on recent studies implicating endoglin (Eng) in early vascular development and angiogenesis, we hypothesized that Eng may be an EC specification gene. Mouse embryonic stem cells (ESC) were treated with recombinant Eng or a plasmid expressing the Eng ORF, and differentiated in the presence or absence of bone morphogenic protein 4 (BMP4). Expression of the mesoderm and EC marker genes, the known mediators of EC specification and their downstream targets was monitored by quantitative PCR, western blot, immunocytochemistry, and flow cytometry. Functionality of the differentiated EC was assessed by in vitro angiogenesis assay and the induction of Icam1 expression in response to TNF-α treatment. Both recombinant Eng and forced Eng expression increased the number of functional EC expressing the EC marker genes VE-cadherin, vWF, and Tie2, and enhanced the effect of BMP4. The Eng-induced EC differentiation was independent of known mediators of EC specification such as Indian Hedgehog (IHH) and BMP4 or of BMP4/Smad1/5/8 signaling. These studies suggest that Eng is a novel EC specification gene.

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