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Effects of beta(3)-adrenoceptor stimulation on prostaglandin E-2-induced bladder hyperactivity and on the cardiovascular system in conscious rats

På svenska

Author

  • H Takeda
  • Y Yamazaki
  • Y Igawa
  • K Kaidoh
  • S Akahane
  • H Miyata
  • O Nishizawa
  • M Akahane
  • Karl-Erik Andersson

Summary, in English

Aims. To investigate the effects of selective beta(2)- and selective beta(3)-adrenoceptor (AR) agonists on prostaglandin (PG) E-2-induced bladder hyperactivity in conscious free-moving rats. Methods. Female Sprague-Dawley rats were anesthetized for implantation of bladder, intravenous, and intra-arterial catheters. The effects of a beta(3)-AR agonist (CL316,243) on cystometric and cardiovascular parameters were assessed in conscious rats. Intravesical instillation of PGE(2) (20-60 muM, 6 mL/hr) in conscious rats produced a concentration-dependent increase in voiding frequency. Results. In this model i.v. CL316,243 (beta(3)-AR agonist) reduced basal bladder pressure, increased micturition volume, and prolonged micturition interval in a dose-dependent manner, without affecting threshold pressure or micturition pressure. On the other hand, i.v. procaterol (beta(2)-AR agonist) did not counteract the bladder hyperactivity. Atropine (muscarinic antagonist) reduced micturition pressure and micturition volume, and shortened micturition interval. CL316,243 slightly decreased mean blood pressure and increased heart rate only when given at high doses (10 and 100 mug/kg, iv.). In contrast, procaterol caused a significant decrease in mean blood pressure and a significant increase in heart rate. Atropine significantly increased heart rate. Conclusions. The present results clearly demonstrated that the beta(3)-AR agonist prolonged the micturition interval without producing significant cardiovascular side effects. The human detrusor, like the rat detrusor, relaxes on beta(3)-AR stimulation. Provided that these results are valid in humans, selective beta(3)-AR agonists might be clinically useful for controlling a certain type of bladder overactivity.

Publishing year

2002

Language

English

Pages

558-565

Publication/Series

Neurourology and Urodynamics

Volume

21

Issue

6

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Urology and Nephrology

Keywords

  • frequent urination
  • bladder
  • overactive
  • prostaglandin E-2
  • beta(3)-adrenoceptor
  • cystometry
  • rat bladder

Status

Published

ISBN/ISSN/Other

  • ISSN: 0733-2467