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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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NRAGE: a potential rheostat during branching morphogenesis.

George N Nikopoulos1, Joao Ferreira Martins, Tamara L Adams

  • 1Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, ME 04074, USA.

Mechanisms of Development
|March 10, 2009
PubMed
Summary

Neurotrophin Receptor MAGE homologue (NRAGE) is crucial for kidney branching morphogenesis. Reduced NRAGE expression impairs kidney development and alters signaling pathways, highlighting its role in early renal development.

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Area of Science:

  • Developmental Biology
  • Nephrology
  • Molecular Biology

Background:

  • Branching morphogenesis is vital for organ development, including the kidneys.
  • The final nephron count is linked to adult hypertension.
  • Bone morphogenetic proteins (BMPs) regulate renal p38 MAP kinase (p38(MAPK)) activity.

Purpose of the Study:

  • To investigate the role of NRAGE in renal branching morphogenesis.
  • To determine if NRAGE affects p38(MAPK) activation during kidney development.
  • To explore the relationship between NRAGE, BMP, and GDNF signaling pathways in renal development.

Main Methods:

  • Utilized antisense morpholino to reduce NRAGE expression in ex vivo kidney explants.
  • Assessed kidney branching and p38(MAPK) activation.
  • Performed RNA profiling on NRAGE-diminished kidney explants.

Main Results:

  • Reduced NRAGE expression led to stunted kidney branching.
  • Exogenous GDNF rescued the branching defect.
  • NRAGE reduction caused a significant decrease in p38(MAPK) activation, which was reversed by GDNF.
  • RNA profiling revealed altered expression of GDNF, Ret, BMP7, and BMPRIb mRNAs.

Conclusions:

  • NRAGE plays a significant role in regulating renal branching morphogenesis.
  • NRAGE influences kidney development through interactions with both BMP and GDNF signaling pathways.
  • These findings suggest NRAGE is a key factor in early kidney development and potentially in nephron formation.