RRC ID 77282
Author Davis JA, Koenig AL, Lubert A, Chestnut B, Liu F, Palencia Desai S, Winkler T, Pociute K, Choi K, Sumanas S.
Title ETS transcription factor Etsrp / Etv2 is required for lymphangiogenesis and directly regulates vegfr3 / flt4 expression.
Journal Dev Biol
Abstract The molecular mechanisms initiating the formation of the lymphatic system, lymphangiogenesis, are still poorly understood. Here we have identified a novel role in lymphangiogenesis for an ETS transcription factor, Etv2/Etsrp, a known regulator of embryonic vascular development. Through the use of fully validated photoactivatable morpholinos we show that inducible Etv2 inhibition in zebrafish embryos at 1 day post-fertilization (dpf) results in significant inhibition of lymphangiogenesis, while development of blood vessels is unaffected. In Etv2-inhibited embryos and larvae, the number of lymphatic progenitors is greatly reduced, the major lymphatic vessel, the thoracic duct, is absent or severely fragmented, and lymphangiogenesis-associated marker expression, including lyve1b, prox1a, and vegfr3/flt4, is strongly downregulated. We also demonstrate that lymphatic progenitors in Etv2 deficient embryos fail to respond to Vegfc signaling. Chromatin immunoprecipitation and sequencing (ChIP-Seq) studies using differentiated mouse embryonic stem (ES) cells as well as luciferase reporter studies in the ES cells and in zebrafish embryos argue that Etv2 directly binds the promoter/enhancer regions of Vegfc receptor Vegfr3/Flt4 and lymphatic marker Lyve1, and promotes their expression. Together these data support a model where Etv2 initiates lymphangiogenesis by directly promoting the expression of flt4 within the posterior cardinal vein.
Volume 440(1)
Pages 40-52
Published 2018-8-1
DOI 10.1016/j.ydbio.2018.05.003
PII S0012-1606(17)30833-3
PMID 29753018
PMC PMC6054491
MeSH Animals Cell Differentiation Embryo, Nonmammalian Embryonic Stem Cells Endothelial Cells / metabolism Gene Expression Regulation, Developmental / genetics HEK293 Cells Humans Lymphangiogenesis / genetics Lymphangiogenesis / physiology* Lymphatic Vessels / embryology Lymphatic Vessels / metabolism Mice Morpholinos / metabolism Signal Transduction Transcription Factors / genetics Transcription Factors / physiology Vascular Endothelial Growth Factor C / genetics Vascular Endothelial Growth Factor Receptor-3 / genetics Zebrafish Zebrafish Proteins / genetics* Zebrafish Proteins / physiology*
IF 2.896
Zebrafish UAS:GFP