ORCID Profile
0000-0002-3808-3978
Current Organisation
New York University
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Publisher: American Society of Hematology
Date: 12-07-2012
DOI: 10.1182/BLOOD-2012-02-408328
Abstract: Understanding the mechanisms that regulate angiogenesis and translating these into effective therapies are of enormous scientific and clinical interests. In this report, we demonstrate the central role of CDP-diacylglycerol synthetase (CDS) in the regulation of VEGFA signaling and angiogenesis. CDS activity maintains phosphoinositide 4,5 bisphosphate (PIP2) availability through resynthesis of phosphoinositides, whereas VEGFA, mainly through phospholipase Cγ1, consumes PIP2 for signal transduction. Loss of CDS2, 1 of 2 vertebrate CDS enzymes, results in vascular-specific defects in zebrafish in vivo and failure of VEGFA-induced angiogenesis in endothelial cells in vitro. Absence of CDS2 also results in reduced arterial differentiation and reduced angiogenic signaling. CDS2 deficit-caused phenotypes can be successfully rescued by artificial elevation of PIP2 levels, and excess PIP2 or increased CDS2 activity can promote excess angiogenesis. These results suggest that availability of CDS-controlled resynthesis of phosphoinositides is essential for angiogenesis.
Publisher: Springer Science and Business Media LLC
Date: 10-2003
DOI: 10.1007/S00441-003-0771-8
Abstract: The vertebrate vascular system is essential for the delivery and exchange of gases, hormones, metabolic wastes and immunity factors. These essential functions are carried out in large part by two types of anatomically distinct blood vessels, namely arteries and veins. Previously, circulatory dynamics were thought to play a major role in establishing this dichotomy, but recently it has become clear that arterial and venous endothelial cells are molecularly distinct even before the output of the first embryonic heartbeat, thus revealing the existence of genetic programs coordinating arterial-venous differentiation. Here we review some of the molecular mechanisms involved in this process.
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 04-2016
DOI: 10.1161/ATVBAHA.115.307087
Abstract: Understanding the mechanisms regulating normal and pathological angiogenesis is of great scientific and clinical interest. In this report, we show that mutations in 2 different aminoacyl-transfer RNA synthetases, threonyl tRNA synthetase (tars y58 ) or isoleucyl tRNA synthetase (iars y68 ) , lead to similar increased branching angiogenesis in developing zebrafish. The unfolded protein response pathway is activated by aminoacyl-transfer RNA synthetase deficiencies, and we show that unfolded protein response genes atf4, atf6 , and xbp1 , as well as the key proangiogenic ligand vascular endothelial growth factor (vegfaa) , are all upregulated in tars y58 and iars y68 mutants. Finally, we show that the protein kinase RNA-like endoplasmic reticulum kinase–activating transcription factor 4 arm of the unfolded protein response pathway is necessary for both the elevated vegfaa levels and increased angiogenesis observed in tars y58 mutants. Our results suggest that endoplasmic reticulum stress acts as a proangiogenic signal via unfolded protein response pathway–dependent upregulation of vegfaa.
No related grants have been discovered for Jesús Torres-Vázquez.