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Adrenoceptors mediating contraction in the human uterine artery

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Author

Summary, in English

Pharmacological characterization of adrenoceptors mediating smooth muscle contraction was performed in isolated preparations from the human uterine artery. The mixed alpha 1- and alpha 2-adrenergic agonist, noradrenaline (NA) and the selective alpha 1-agonists, phenylephrine and methoxamine, all contracted the smooth muscle preparations in a concentration-dependent manner. The responses were antagonized competitively by the selective alpha 1-antagonist, prazosin, yielding pA2 values for the three agonists (8.33-9.08) typical for an interaction with alpha 1-receptors. The alpha 2-selective receptor agonists, clonidine and BHT 920, did not exert any contractile effects in the isolated uterine arteries, and the alpha 2-adrenergic antagonist, yohimbine, counteracted the contractile effect of NA only at high concentrations. The concentration-response curve for NA was unaffected by the alpha 2-selective antagonists, rauwolscine and idazoxan. The results suggest that the postjunctional contractile receptors in the human uterine artery primarily are of the alpha 1 type, and give no evidence for any substantial involvement of alpha 2-receptors in this important tributary vessel of the human female reproductive tract.

Department/s

Publishing year

1990

Language

English

Pages

19-24

Publication/Series

Human Reproduction

Volume

5

Issue

1

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Obstetrics, Gynecology and Reproductive Medicine
  • Pharmacology and Toxicology

Keywords

  • adrenoceptors/noradrenaline/uterine artery/vascular/smooth muscle

Status

Published

Research group

  • Urogynaecology and Reproductive Pharmacology
  • Drug Target Discovery

ISBN/ISSN/Other

  • ISSN: 0268-1161