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Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
08:46

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Published on: September 1, 2015

Cyclic AMP-mediated cyst expansion.

Darren P Wallace1

  • 1Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS, USA. dwallace@kumc.edu

Biochimica Et Biophysica Acta
|December 2, 2010
PubMed
Summary
This summary is machine-generated.

In polycystic kidney disease (PKD), cyclic AMP (cAMP) drives cyst growth by increasing cell proliferation and fluid secretion. This review explores how cAMP signaling differs in PKD versus normal cells and discusses therapeutic targets.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Cell Signaling

Background:

  • Intracellular cyclic AMP (cAMP) promotes cyst enlargement in polycystic kidney disease (PKD).
  • cAMP uniquely stimulates proliferation in PKD renal epithelial cells, unlike in normal cells.
  • This difference involves cross-talk between cAMP, Ca(2+) signaling, and the B-Raf/MEK/ERK pathway.

Purpose of the Study:

  • To review current knowledge on cAMP-dependent cyst expansion in PKD.
  • To focus on the mechanisms of cell proliferation and fluid secretion.
  • To discuss potential therapeutic strategies targeting renal cAMP pathways.

Main Methods:

  • Review of existing literature on cAMP signaling in PKD.
  • Analysis of signaling pathways involving cAMP, Ca(2+), Akt, and B-Raf.
  • Examination of cystic fibrosis transmembrane conductance regulator (CFTR) in fluid secretion.

Main Results:

  • In PKD, disrupted Ca(2+) homeostasis relieves Akt inhibition of B-Raf, enabling cAMP-induced proliferation.
  • cAMP stimulates ERK pathway activation in PKD cells.
  • Transepithelial fluid secretion in cysts is mediated by cAMP-dependent Cl(-) secretion via CFTR.

Conclusions:

  • Dysregulated cAMP signaling is a key driver of PKD cystogenesis.
  • Targeting cAMP production or its downstream effectors offers potential therapeutic avenues.
  • Understanding the interplay of cAMP and Ca(2+) signaling is crucial for developing effective PKD treatments.