Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1

Àlex Robert-Moreno; Àlex Robert-Moreno; Jordi Guiu; Cristina Ruiz-Herguido; M. Eugenia López; Julia Inglés-Esteve; Lluis Riera; Lluis Riera; Alex Tipping; Tariq Enver; Elaine Dzierzak; Thomas Gridley; Lluis Espinosa; Anna Bigas; Anna Bigas

doi:10.1038/emboj.2008.113

Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1

Àlex Robert-Moreno, Àlex Robert-Moreno, Jordi Guiu, Cristina Ruiz-Herguido, M. Eugenia López, Julia Inglés-Esteve, Lluis Riera, Lluis Riera, Alex Tipping, Tariq Enver, Elaine Dzierzak, Thomas Gridley, Lluis Espinosa, Anna Bigas, Anna Bigas

131 Citations (Scopus)

Abstract

Specific deletion of Notch1 and RBPjκ in the mouse results in abrogation of definitive haematopoiesis concomitant with the loss of arterial identity at embryonic stage. As prior arterial determination is likely to be required for the generation of embryonic haematopoiesis, it is difficult to establish the specific haematopoietic role of Notch in these mutants. By analysing different Notch-ligand-null embryos, we now show that Jagged1 is not required for the establishment of the arterial fate but it is required for the correct execution of the definitive haematopoietic programme, including expression of GATA2 in the dorsal aorta. Moreover, successful haematopoietic rescue of the Jagged1-null AGM cells was obtained by culturing them with Jagged1-expressing stromal cells or by lentiviral-mediated transduction of the GATA2 gene. Taken together, our results indicate that Jagged1-mediated activation of Notch1 is responsible for regulating GATA2 expression in the AGM, which in turn is essential for definitive haematopoiesis in the mouse.

Original language	English
Journal	EMBO Journal
Volume	27
Issue number	13
Pages (from-to)	1886-1895
Number of pages	10
ISSN	0261-4189
DOIs	https://doi.org/10.1038/emboj.2008.113
Publication status	Published - 9 Jul 2008

Keywords

AGM
GATA2
Haematopoiesis
Jagged1
Notch

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10.1038/emboj.2008.113

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Robert-Moreno, À., Robert-Moreno, À., Guiu, J., Ruiz-Herguido, C., López, M. E., Inglés-Esteve, J., Riera, L., Riera, L., Tipping, A., Enver, T., Dzierzak, E., Gridley, T., Espinosa, L., Bigas, A., & Bigas, A. (2008). Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1. EMBO Journal, 27(13), 1886-1895. https://doi.org/10.1038/emboj.2008.113

Robert-Moreno, À, Robert-Moreno, À, Guiu, J, Ruiz-Herguido, C, López, ME, Inglés-Esteve, J, Riera, L, Riera, L, Tipping, A, Enver, T, Dzierzak, E, Gridley, T, Espinosa, L, Bigas, A & Bigas, A 2008, 'Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1', EMBO Journal, vol. 27, no. 13, pp. 1886-1895. https://doi.org/10.1038/emboj.2008.113

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abstract = "Specific deletion of Notch1 and RBPjκ in the mouse results in abrogation of definitive haematopoiesis concomitant with the loss of arterial identity at embryonic stage. As prior arterial determination is likely to be required for the generation of embryonic haematopoiesis, it is difficult to establish the specific haematopoietic role of Notch in these mutants. By analysing different Notch-ligand-null embryos, we now show that Jagged1 is not required for the establishment of the arterial fate but it is required for the correct execution of the definitive haematopoietic programme, including expression of GATA2 in the dorsal aorta. Moreover, successful haematopoietic rescue of the Jagged1-null AGM cells was obtained by culturing them with Jagged1-expressing stromal cells or by lentiviral-mediated transduction of the GATA2 gene. Taken together, our results indicate that Jagged1-mediated activation of Notch1 is responsible for regulating GATA2 expression in the AGM, which in turn is essential for definitive haematopoiesis in the mouse.",

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Impaired embryonic haematopoiesis yet normal arterial development in the absence of the Notch ligand Jagged1

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Keywords

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