title: The influence of doxazosin, an alpha1-adrenergic receptor antagonist on the urinary bladder contractility in pigs.
abstract: In the present study influence of doxazosin on the porcine urinary bladder contractility has been examined. Immature pigs were treated for 30 days with: a) doxazosin (n = 5) per os at a dose of 0.1 mg/kg b.w. or b) placebo (n = 5; control group). Thereafter, animals were sacrificed and urinary bladder strips from the trigone were suspended in organ baths. The tension of the smooth musce was measured before and after exposition to acetylocholine (ACh; 10(-5) - 10(-3) M), norepinephrine (NE; 10(-9) - 10(-7) M) and 5-hydroxytryptamine (5-HT; 10(-7) - 10(-5) M). Both the ACh and 5-HT at the highest doses significantly increased the contractility in each group, but this response was weaker in doxazosin-treated animals. NE caused relaxation in both groups, but the effect was weaker in doxazosine-treated group. The results of our study have shown that long-term administration of doxazosin caused a desensitization of the detrusor smooth muscle for in vitro applied mediators of the autonomic nervous systems.
authors.forename: W
authors.initials: W
authors.lastname: Markiewicz
authors.forename: A
authors.initials: A
authors.lastname: Jasiecka
authors.forename: D
authors.initials: D
authors.lastname: Barski
authors.forename: J
authors.initials: J
authors.lastname: Janiuk
authors.forename: A
authors.initials: A
authors.lastname: Bossowska
authors.forename: J J
authors.initials: JJ
authors.lastname: Jaroszewski
mesh_terms: D058668:Adrenergic alpha-1 Receptor Antagonists / Q000494:pharmacology*; D000818:Animals; D017292:Doxazosin / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology; D013552:Swine; D001743:Urinary Bladder / Q000187:drug effects* / Q000502:physiology
chemical_list: D058668:Adrenergic alpha-1 Receptor Antagonists; D017292:Doxazosin