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• W2061015397 abstract "The balance between nephron progenitor cell (NPC) renewal, survival and differentiation ultimately determines nephron endowment and thus susceptibile to chronic kidney disease and hypertension. Embryos lacking the p53-E3 ubiquitin ligase, Murine double minute 2 (Mdm2), die secondary to p53-mediated apoptosis and growth arrest, demonstrating the absolute requirement of Mdm2 in embryogenesis. Although Mdm2 is required in the maintenance of hematopoietic stem cells, its role in renewal and differentiation of stem/progenitor cells during kidney organogenesis is not well defined. Here we examine the role of the Mdm2-p53 pathway in NPC renewal and fate in mice. The Six2-GFP::Cretg/+ mediated inactivation of Mdm2 in the NPC (NPCMdm2−/−) results in perinatal lethality. NPCMdm2−/− neonates have hypo-dysplastic kidneys, patchy depletion of the nephrogenic zone and pockets of superficially placed, ectopic, well-differentiated proximal tubules. NPCMdm2−/− metanephroi exhibit thinning of the progenitor GFP+/Six2+ population and a marked reduction or loss of progenitor markers Amphiphysin, Cited1, Sall1 and Pax2. This is accompanied by aberrant accumulation of phospho-γH2AX and p53, and elevated apoptosis together with reduced cell proliferation. E13.5–E15.5 NPCMdm2−/− kidneys show reduced expression of Eya1, Pax2 and Bmp7 while the few surviving nephron precursors maintain expression of Wnt4, Lhx1, Pax2, and Pax8. Lineage fate analysis and section immunofluorescence revealed that NPCMdm2−/− kidneys have severely reduced renal parenchyma embedded in an expanded stroma. Six2-GFP::Cretg/+; Mdm2f/f mice bred into a p53 null background ensures survival of the GFP-positive, self-renewing progenitor mesenchyme and therefore restores normal renal development and postnatal survival of mice. In conclusion, the Mdm2-p53 pathway is essential to the maintenance of the nephron progenitor niche." @default.
• W2061015397 created "2016-06-24" @default.
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• W2061015397 date "2014-03-01" @default.
• W2061015397 modified "2023-10-06" @default.
• W2061015397 title "Mdm2 is required for maintenance of the nephrogenic niche" @default.
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• W2061015397 doi "https://doi.org/10.1016/j.ydbio.2014.01.009" @default.
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