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Development. 2015 Apr 1;142(7):1254-66. doi: 10.1242/dev.119735.

WT1 targets Gas1 to maintain nephron progenitor cells by modulating FGF signals.

Author information

1
Division of Nephrology, Department of Medicine, Boston Children's Hospital, Boston, MA 02115, USA Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA Department II of Medicine and Center for Molecular Medicine Cologne, University of Cologne, 50931 Cologne, Germany.
2
Division of Nephrology, Department of Medicine, Boston Children's Hospital, Boston, MA 02115, USA Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA.
3
Department II of Medicine and Center for Molecular Medicine Cologne, University of Cologne, 50931 Cologne, Germany.
4
Department of Embryology, Carnegie Institution of Washington, Baltimore, MD 21218, USA.
5
Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE, Canada C1A 4P3.
6
Department II of Medicine and Center for Molecular Medicine Cologne, University of Cologne, 50931 Cologne, Germany Cluster of Excellence on Cellular Stress Responses in Ageing-Associated Diseases (CECAD) and Systems Biology of Ageing Cologne, University of Cologne, 50931 Cologne, Germany.
7
Division of Nephrology, Department of Medicine, Boston Children's Hospital, Boston, MA 02115, USA Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA Harvard Stem Cell Institute, Cambridge, MA 02138, USA jordan.kreidberg@childrens.harvard.edu.

Abstract

Development of the metanephric kidney depends on tightly regulated interplay between self-renewal and differentiation of a nephron progenitor cell (NPC) pool. Several key factors required for the survival of NPCs have been identified, including fibroblast growth factor (FGF) signaling and the transcription factor Wilms' tumor suppressor 1 (WT1). Here, we present evidence that WT1 modulates FGF signaling by activating the expression of growth arrest-specific 1 (Gas1), a novel WT1 target gene and novel modulator of FGF signaling. We show that WT1 directly binds to a conserved DNA binding motif within the Gas1 promoter and activates Gas1 mRNA transcription in NPCs. We confirm that WT1 is required for Gas1 expression in kidneys in vivo. Loss of function of GAS1 in vivo results in hypoplastic kidneys with reduced nephron mass due to premature depletion of NPCs. Although kidney development in Gas1 knockout mice progresses normally until E15.5, NPCs show decreased rates of proliferation at this stage and are depleted as of E17.5. Lastly, we show that Gas1 is selectively required for FGF-stimulated AKT signaling in vitro. In summary, our data suggest a model in which WT1 modulates receptor tyrosine kinase signaling in NPCs by directing the expression of Gas1.

KEYWORDS:

Fibroblast growth factor signaling; Kidney development; Mouse; Nephron progenitor cell

PMID:
25804736
PMCID:
PMC4378252
DOI:
10.1242/dev.119735
[Indexed for MEDLINE]
Free PMC Article

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