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Interconnected network motifs control podocyte morphology and kidney function.

Evren U Azeloglu1, Simon V Hardy, Narat John Eungdamrong

  • 11Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine, New York, NY 10029, USA.

Science Signaling
|February 6, 2014
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Summary
This summary is machine-generated.

Protein kinase A (PKA) and cyclic AMP (cAMP) signaling regulate podocyte morphology in kidney disease. Network analysis revealed that specific regulatory motifs can restore normal kidney function through targeted drug interventions.

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Area of Science:

  • Molecular Biology
  • Renal Physiology
  • Systems Biology

Background:

  • Podocytes are crucial for glomerular filtration, and their specialized morphology is vital for kidney function.
  • Disruptions in podocyte foot process morphology, often seen in diseases like diabetes or due to drug exposure, lead to kidney pathophysiology.
  • Protein kinase A (PKA) signaling, activated by cyclic AMP (cAMP), emerges as a key regulator of podocyte structure and function.

Purpose of the Study:

  • To investigate the regulatory network controlling cAMP response element-binding protein (CREB) activity in podocytes.
  • To understand how feedback and feedforward motifs within this network influence gene expression and podocyte morphology.
  • To explore the potential of modulating these regulatory motifs for therapeutic intervention in kidney disease.

Main Methods:

  • Proteomic analysis of glomeruli from rats with puromycin-induced kidney disease and control rats.
  • Construction and experimental verification of a β-adrenergic receptor-driven signaling network.
  • Application of multicompartment dynamical models and Petri net formalisms to map network topology and protein localization.
  • In vivo drug-induced modulation of identified regulatory motifs in diseased rats.

Main Results:

  • The study identified a regulatory network controlling CREB activity, involving feedback and feedforward motifs.
  • Computational analyses demonstrated that these motifs enable prolonged CREB activation, essential for synaptopodin expression and actin bundling.
  • Drug-induced modulation of these motifs successfully restored normal podocyte morphology and kidney function in vivo.

Conclusions:

  • The interplay of regulatory motifs in the cAMP-PKA-CREB pathway is critical for maintaining podocyte morphology and function.
  • Network dynamics analysis provides valuable insights into kidney disease pathophysiology.
  • Targeting these regulatory motifs offers a promising strategy for developing novel therapeutic interventions for kidney diseases.