Noradrenergic Vasoconstriction of Pig Prostatic Small Arteries

Overview

Journal Naunyn Schmiedebergs Arch Pharmacol

Specialty Pharmacology

Date 2008 Jan 4

PMID 18172615

Citations 10

Authors

Paz Recio

Luis M Orensanz

Maria Pilar Martinez

Jorge Navarro-Dorado

Salvador Bustamante

Albino Garcia-Sacristan

Dolores Prieto

Medardo Hernandez

Affiliations

Soon will be listed here.

Abstract

The current study investigated the distribution of adrenergic nerves and the action induced by noradrenaline (NA) in pig prostatic small arteries. Noradrenergic innervation was visualized using an antibody against dopamine-beta-hydroxylase (DBH), and the NA effect was studied in small arterial rings mounted in microvascular myographs for isometric force recordings. DBH-immunoreactive nerve fibers were located at the adventitia and the adventitia-media border of the vascular wall. Electrical field stimulation (EFS, 1-32 Hz) evoked frequency-dependent contractions that were reduced by guanethidine and prazosin (adrenergic neurotransmission and alpha1-adrenoceptors blockers, respectively) and by the alpha2-adrenoceptor agonist UK 14,304. The alpha2-adrenoceptor antagonist rauwolscine reversed the UK 14,304-produced inhibition. NA produced endothelium-independent contractions that were antagonized with low estimated affinities and Schild slopes different from unity by prazosin and the alpha1A-adrenoceptor antagonist N-[2-(2-cyclopropylmethoxyphenoxy)ethyl]-5-chloro-alpha-alpha-dimethyl-1H-indole-3-ethanamine (RS 17053). The alpha1A-adrenoceptor antagonist 5-methyl-3-[3-[4-[2-(2,2,2,-trifluoroethoxy) phenyl]-1-piperazinyl]propyl]-2,4-(1H)-pyrimidinedione (RS 100329), which also displays high affinity for alpha1L-adrenoceptors, and the alpha1L-adrenoceptor antagonist tamsulosin, which also has high affinity for alpha1A- and alpha1D-adrenoceptors, induced rightward shifts with high affinity of the contraction-response curve to NA. The alpha1D-adrenoceptor antagonist 8-[2-[4-(2-methoxyphenyl)-1-piperazinyl]-ethyl]8-azaspiro[4,5]decane-7,9-dione dihydrochloride (BMY 7378) failed to modify the NA contractions that were inhibited by extracellular Ca2+ removal and by voltage-activated (L-type) Ca2+ channel blockade. These data suggest that pig prostatic resistance arteries have a rich noradrenergic innervation; and NA, whose release is modulated by prejunctional alpha2-adrenoceptors, evokes contraction mainly through activation of muscle alpha1L-adrenoceptors coupled to extracellular Ca2+ entry via voltage (L-type)- and non-voltage-activated Ca2+ channels.

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