Urological Research

, Volume 29, Issue 6, pp 388–392 | Cite as

Identification and functional study of phosphodiesterases in rat urinary bladder

  • Yuhong Qiu
  • Patricia Kraft
  • Elizabeth C. Craig
  • Xiulin Liu
  • Donna Haynes-Johnson
Original Paper

Abstract

Cyclic nucleotides are important secondary messengers involved in modulating the contractility of various smooth muscles. Phosphodiesterases (PDE) play important roles in this process by modulating the levels of cyclic nucleotides and their duration of action. This study was designed to identify and characterize the PDE isoenzymes in rat urinary bladder and to evaluate their roles in regulating bladder smooth muscle tone. The involvement of cAMP and cGMP pathways in this process was also assessed. The studies were carried out with tissues from male and female rats and no significant sex-related difference was found in the results. Utilizing the unique pharmacological properties of different isoenzymes, PDE1, 2, 3, 4, and 5 were identified in rat bladder. Organ bath experiments showed that forskolin was most potent in relaxing pre-contracted rat bladder strips while sodium nitroprusside was moderately effective, suggesting the relaxation was mainly mediated by the cAMP pathway and that the cGMP pathway is moderately involved. For PDE inhibitors, the non-specific inhibitor papaverine was most effective in relaxing pre-contracted bladder strips. Among isoenzyme-selective inhibitors, vinpocetine, EHNA, and sildenafil induced more relaxation than milrinone and rolipram.

Phosphodiesterase Urinary bladder Cyclic nucleotides 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Yuhong Qiu
    • 1
  • Patricia Kraft
    • 1
  • Elizabeth C. Craig
    • 1
  • Xiulin Liu
    • 1
  • Donna Haynes-Johnson
    • 1
  1. 1.Reproductive Therapeutics, R.W. Johnson Pharmaceutical Research Institute, 1000 Route 202 South, Raritan, NJ 08869, USAUSA

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