Tamsulosin modulates, but does not abolish the spontaneous activity in the guinea pig prostate gland

Basu Chakrabarty, Anupa Dey, Michelle Lam, Sabatino Ventura, Betty Exintaris

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

AIMS: To examine the effects of the α1A -adrenoceptor antagonist, tamsulosin, on spontaneous contractile and electrical activity in the guinea-pig prostate gland.

METHODS: The effects of tamsulosin (0.1 and 0.3 nM) were investigated in adult and ageing male guinea pig prostate glands using conventional tension recording and electrophysiological intracellular microelectrode recording techniques.

RESULTS: Tamsulosin reduced spontaneous activity, and had different age-dependent effects on adult and ageing guinea pigs at different concentrations. 0.1 nM tamsulosin caused a significantly greater reduction of spontaneous contractile and electrical activity in ageing guinea pigs in comparison to adult guinea pigs. In contrast, 0.3 nM tamsulosin had a significantly greater reduction of spontaneous contractile and electrical activity in adult guinea pigs in comparison to ageing guinea pigs.

CONCLUSIONS: This study demonstrates that tamsulosin can modulate spontaneous myogenic stromal contractility and the underlying spontaneous electrical activity; tamsulosin does not block spontaneous activity. This reduction in spontaneous activity suggests that downstream cellular mechanisms underlying smooth muscle tone are being targeted, and these may represent novel therapeutic targets to better treat benign prostatic hyperplasia.

Original languageEnglish
Pages (from-to)482-8
Number of pages7
JournalNeurourology and Urodynamics
Volume34
Issue number5
DOIs
Publication statusPublished - Jun 2015

Keywords

  • Adrenergic alpha-1 Receptor Antagonists/pharmacology
  • Aging
  • Animals
  • Electrophysiological Phenomena/drug effects
  • Guinea Pigs
  • Male
  • Membrane Potentials/drug effects
  • Muscle Contraction/drug effects
  • Muscle, Smooth/drug effects
  • Prostate/drug effects
  • Sulfonamides/pharmacology

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