title: The transcription factor Erg regulates expression of histone deacetylase 6 and multiple pathways involved in endothelial cell migration and angiogenesis.
abstract: The endothelial ETS transcription factor Erg plays an important role in homeostasis and angiogenesis by regulating many endothelial functions including survival and junction stability. Here we show that Erg regulates endothelial cell (EC) migration. Transcriptome profiling of Erg-deficient ECs identified ∼ 80 genes involved in cell migration as candidate Erg targets, including many regulators of Rho- GTPases. Inhibition of Erg expression in HUVECs resulted in decreased migration in vitro, while Erg overexpression using adenovirus caused increased migration. Live-cell imaging of Erg-deficient HUVECs showed a reduction in lamellipodia, in line with decreased motility. Both actin and tubulin cytoskeletons were disrupted in Erg-deficient ECs, with a dramatic increase in tubulin acetylation. Among the most significant microarray hits was the cytosolic histone deacetylase 6 (HDAC6), a regulator of cell migration. Chromatin immunoprecipitation (ChIP) and transactivation studies demonstrated that Erg regulates HDAC6 expression. Rescue experiments confirmed that HDAC6 mediates the Erg-dependent regulation of tubulin acetylation and actin localization. In vivo, inhibition of Erg expression in angiogenic ECs resulted in decreased HDAC6 expression with increased tubulin acetylation. Thus, we have identified a novel function for the transcription factor Erg in regulating HDAC6 and multiple pathways essential for EC migration and angiogenesis.
authors: Cardiovascular Sciences, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, United Kingdom.
authors: Graeme M
authors: GM
authors: Birdsey
authors: Nicola H
authors: NH
authors: Dryden
authors: Aarti V
authors: AV
authors: Shah
authors: Rebecca
authors: R
authors: Hannah
authors: Matthew D
authors: MD
authors: Hall
authors: Dorian O
authors: DO
authors: Haskard
authors: Maddy
authors: M
authors: Parsons
authors: Justin C
authors: JC
authors: Mason
authors: Marketa
authors: M
authors: Zvelebil
authors: Berthold
authors: B
authors: Gottgens
authors: Anne J
authors: AJ
authors: Ridley
authors: Anna M
authors: AM
authors: Randi
mesh_terms: D000107:Acetylation; D000199:Actins / Q000378:metabolism; D015415:Biomarkers / Q000378:metabolism*; D015153:Blotting, Western; D002465:Cell Movement; D002478:Cells, Cultured; D047369:Chromatin Immunoprecipitation; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D000073864:Histone Deacetylase 6; D006655:Histone Deacetylases / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D018919:Neovascularization, Physiologic; D020411:Oligonucleotide Array Sequence Analysis; D011401:Promoter Regions, Genetic / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D015534:Trans-Activators / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000071230:Transcriptional Regulator ERG; D014471:Umbilical Veins / Q000166:cytology / Q000378:metabolism
chemical_list: D000199:Actins; D015415:Biomarkers; C072312:ERG protein, human; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D015534:Trans-Activators; D000071230:Transcriptional Regulator ERG; C433811:HDAC6 protein, human; D000073864:Histone Deacetylase 6; D006655:Histone Deacetylases