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E2F7 and E2F8 promote angiogenesis through transcriptional activation of VEGFA in cooperation with HIF1.
EMBO J ; 31(19): 3871-84, 2012 Oct 03.
Article em En | MEDLINE | ID: mdl-22903062
The E2F family of transcription factors plays an important role in controlling cell-cycle progression. While this is their best-known function, we report here novel functions for the newest members of the E2F family, E2F7 and E2F8 (E2F7/8). We show that simultaneous deletion of E2F7/8 in zebrafish and mice leads to severe vascular defects during embryonic development. Using a panel of transgenic zebrafish with fluorescent-labelled blood vessels, we demonstrate that E2F7/8 are essential for proper formation of blood vessels. Despite their classification as transcriptional repressors, we provide evidence for a molecular mechanism through which E2F7/8 activate the transcription of the vascular endothelial growth factor A (VEGFA), a key factor in guiding angiogenesis. We show that E2F7/8 directly bind and stimulate the VEGFA promoter independent of canonical E2F binding elements. Instead, E2F7/8 form a transcriptional complex with the hypoxia inducible factor 1 (HIF1) to stimulate VEGFA promoter activity. These results uncover an unexpected link between E2F7/8 and the HIF1-VEGFA pathway providing a molecular mechanism by which E2F7/8 control angiogenesis.
Assuntos

Texto completo: 1 Coleções: 01-internacional Temas: Geral Base de dados: MEDLINE Assunto principal: Ativação Transcricional / Neovascularização Fisiológica / Fator A de Crescimento do Endotélio Vascular / Fator 1 Induzível por Hipóxia / Fatores de Transcrição E2F Limite: Animals / Humans Idioma: En Revista: EMBO J Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Holanda

Texto completo: 1 Coleções: 01-internacional Temas: Geral Base de dados: MEDLINE Assunto principal: Ativação Transcricional / Neovascularização Fisiológica / Fator A de Crescimento do Endotélio Vascular / Fator 1 Induzível por Hipóxia / Fatores de Transcrição E2F Limite: Animals / Humans Idioma: En Revista: EMBO J Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Holanda