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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology

Published on: August 18, 2014

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Phosphodiesterase types 3 and 4 regulate the phasic contraction of neonatal rat bladder smooth myocytes via distinct

Kui Zhai1, Yan Chang2, Bin Wei2

  • 1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; Inserm UMR-S 769, LabEx LERMIT, F-92296 Châtenay-Malabry, France; Université Paris-Sud, Faculté de Pharmacie, F-92296 Châtenay-Malabry, France.

Cellular Signalling
|January 28, 2014
PubMed

Insights

Phosphodiesterase (PDE) 3 and PDE4 enzymes are key regulators of bladder smooth muscle contractions. PDE4 is more active than PDE3, with both impacting bladder function through distinct mechanisms.

Area of Science:

  • Pharmacology
  • Urology
  • Cell Physiology

Background:

  • The cyclic AMP (cAMP) pathway influences bladder contractility.
  • The specific roles of phosphodiesterase (PDE) families in bladder smooth muscle function remain unclear.

Purpose of the Study:

  • To investigate the roles of cAMP-hydrolyzing PDE families (PDE1-4) in regulating neonatal rat bladder smooth muscle contractility.
  • To elucidate the mechanisms by which PDE3 and PDE4 influence bladder contractions.

Main Methods:

  • RT-PCR and Western blotting to identify PDE isoform expression in neonatal rat bladders.
  • Pharmacological inhibition of PDE1-4 in isolated bladder strips and single smooth myocytes.
  • Measurement of intracellular calcium (Ca2+) dynamics and analysis of contractile responses.

Main Results:

  • PDE1 and PDE2 inhibitors had no significant effect on carbachol-induced bladder contractions.
  • PDE3 and PDE4 inhibitors (cilostamide and Ro-20-1724, respectively) significantly reduced bladder contractility.
  • PDE4 inhibition affected Ca2+ spark frequency, Ca2+ transients, and sarcoplasmic reticulum Ca2+ content, while PDE3 inhibition did not.
  • PDE4's inhibitory effects were linked to PKA and ryanodine/iberiotoxin-sensitive channels, whereas PDE3's effects involved PKG.

Conclusions:

  • PDE3 and PDE4 are the primary PDE isoforms regulating neonatal rat bladder smooth muscle phasic contractions.
  • PDE4 exhibits greater functional activity than PDE3 in this context.
  • PDE4 and PDE3 modulate bladder contractility through distinct intracellular signaling pathways.
Keywords:
BK channelsBladder smooth myocytesCa(2+) sparksNeonatal ratPDE

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