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Silodosin and tadalafil have synergistic inhibitory effects on nerve-mediated contractions of human and rat isolated prostates.

Buono, Roberta; Briganti, Alberto; Freschi, Massimo; Villa, Luca; La Croce, Giovanni; Moschini, Marco; Benigni, Fabio; Castiglione, Fabio; Montorsi, Francesco and Hedlund, Petter LU (2014) In European Journal of Pharmacology 744(Sep 23). p.42-51
Abstract
Lower urinary tract symptoms (LUTS) in men with benign prostatic hyperplasia (BPH) are associated with erectile dysfunction. Alpha-1-adrenoceptor antagonists are effective drugs for treating symptomatic BPH. Clinical data show improvements in LUTS by phosphodiesterase 5 inhibitors. This study aimed to evaluate effects of silodosin, a highly selective α1A-adrenoceptor antagonist, alone or in combination with the phosphodiesterase 5 inhibitor tadalafil on contractions of isolated human and rat prostates. In organbath studies, effects of increasing concentrations of silodosin (1nM-1µM) and tadalafil (100nM-100µM) on contractions by electrical field stimulation or phenylephrine of human and rat prostate strip preparations were investigated.... (More)
Lower urinary tract symptoms (LUTS) in men with benign prostatic hyperplasia (BPH) are associated with erectile dysfunction. Alpha-1-adrenoceptor antagonists are effective drugs for treating symptomatic BPH. Clinical data show improvements in LUTS by phosphodiesterase 5 inhibitors. This study aimed to evaluate effects of silodosin, a highly selective α1A-adrenoceptor antagonist, alone or in combination with the phosphodiesterase 5 inhibitor tadalafil on contractions of isolated human and rat prostates. In organbath studies, effects of increasing concentrations of silodosin (1nM-1µM) and tadalafil (100nM-100µM) on contractions by electrical field stimulation or phenylephrine of human and rat prostate strip preparations were investigated. The combination silodosin and tadalafil reduced electrically-induced contractions of human prostate preparations better than single drugs alone. At any frequencies (1-32Hz), inhibitory effects of combined therapy (P-values vs single drug) in human tissue were 26-42% (1nM silodosin+100nM tadalafil; P<0.05), 40-58% (10nM silodosin+1µM tadalafil; P<0.001-0.05), 56-67% (100nM silodosin+10µM tadalafil; P<0.01-0.05), and 33-55% (1µM silodosin+100µM tadalafil P<0.01-0.05). Similar findings were obtained in rat prostate preparations. In human and rat prostate tissue, the drug combination exerted similar inhibitory effect on phenylephrine contractions as silodosin alone. Silodosin plus tadalafil had greater potency than each drug alone to inhibit prostate contractions to electrical field stimulation but not to phenylephrine. This study supports the clinical application of a combination of an α1A-adrenoceptor antagonist and a phosphodiesterase 5 inhibitor for symptomatic BPH and suggests that the drug combination requires endogenous nerve-activity for optimal effect. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Journal of Pharmacology
volume
744
issue
Sep 23
pages
42 - 51
publisher
Elsevier
external identifiers
  • pmid:25261033
  • wos:000346016000006
  • scopus:84918804818
ISSN
1879-0712
DOI
10.1016/j.ejphar.2014.09.030
language
English
LU publication?
yes
id
10f4fed2-ce27-4fd6-ae55-73aaba448f39 (old id 4690857)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25261033?dopt=Abstract
date added to LUP
2014-10-08 18:47:32
date last changed
2017-07-30 03:21:24
@article{10f4fed2-ce27-4fd6-ae55-73aaba448f39,
  abstract     = {Lower urinary tract symptoms (LUTS) in men with benign prostatic hyperplasia (BPH) are associated with erectile dysfunction. Alpha-1-adrenoceptor antagonists are effective drugs for treating symptomatic BPH. Clinical data show improvements in LUTS by phosphodiesterase 5 inhibitors. This study aimed to evaluate effects of silodosin, a highly selective α1A-adrenoceptor antagonist, alone or in combination with the phosphodiesterase 5 inhibitor tadalafil on contractions of isolated human and rat prostates. In organbath studies, effects of increasing concentrations of silodosin (1nM-1µM) and tadalafil (100nM-100µM) on contractions by electrical field stimulation or phenylephrine of human and rat prostate strip preparations were investigated. The combination silodosin and tadalafil reduced electrically-induced contractions of human prostate preparations better than single drugs alone. At any frequencies (1-32Hz), inhibitory effects of combined therapy (P-values vs single drug) in human tissue were 26-42% (1nM silodosin+100nM tadalafil; P&lt;0.05), 40-58% (10nM silodosin+1µM tadalafil; P&lt;0.001-0.05), 56-67% (100nM silodosin+10µM tadalafil; P&lt;0.01-0.05), and 33-55% (1µM silodosin+100µM tadalafil P&lt;0.01-0.05). Similar findings were obtained in rat prostate preparations. In human and rat prostate tissue, the drug combination exerted similar inhibitory effect on phenylephrine contractions as silodosin alone. Silodosin plus tadalafil had greater potency than each drug alone to inhibit prostate contractions to electrical field stimulation but not to phenylephrine. This study supports the clinical application of a combination of an α1A-adrenoceptor antagonist and a phosphodiesterase 5 inhibitor for symptomatic BPH and suggests that the drug combination requires endogenous nerve-activity for optimal effect.},
  author       = {Buono, Roberta and Briganti, Alberto and Freschi, Massimo and Villa, Luca and La Croce, Giovanni and Moschini, Marco and Benigni, Fabio and Castiglione, Fabio and Montorsi, Francesco and Hedlund, Petter},
  issn         = {1879-0712},
  language     = {eng},
  number       = {Sep 23},
  pages        = {42--51},
  publisher    = {Elsevier},
  series       = {European Journal of Pharmacology},
  title        = {Silodosin and tadalafil have synergistic inhibitory effects on nerve-mediated contractions of human and rat isolated prostates.},
  url          = {http://dx.doi.org/10.1016/j.ejphar.2014.09.030},
  volume       = {744},
  year         = {2014},
}