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Research ArticleArticle

Role of Vasopressin on Adrenergic Neurotransmission in Human Penile Blood Vessels

Gloria Segarra, Pascual Medina, Cristina Domenech, José M. Vila, Juan B. Martínez-León, Martín Aldasoro and Salvador Lluch
Journal of Pharmacology and Experimental Therapeutics September 1998, 286 (3) 1315-1320;
Gloria Segarra
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Pascual Medina
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Cristina Domenech
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José M. Vila
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Juan B. Martínez-León
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Martín Aldasoro
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Salvador Lluch
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Abstract

We have used in vitro preparations of human penile dorsal artery and deep dorsal vein from 20 multiorgan donors to investigate whether subpressor concentrations of vasopressin facilitate noradrenergic transmission in penile blood vessels. Vasopressin constricted penile dorsal arteries (pD2, 9.38 ± 0.18) and deep dorsal veins (pD2, 9.40 ± 0.14) by activating V1 receptors. Vasopressin (10−11 and 3 × 10−11 M) caused concentration-dependent potentiation of the contractions elicited by electrical stimulation (15 V, 0.5–2 Hz, 0.2 msec duration for 15 sec) and produced leftward shifts of the concentration-response curve for norepinephrine. The V1 receptor antagonist d(CH2)5Tyr(Me)AVP (3 × 10−9-10−7 M) induced concentration-dependent inhibitions of potentiation caused by vasopressin. In contrast, the V2 receptor antagonist [d(CH2)5,d-Ile2, Ile4,Arg8]-vasopressin (10−8-10−7 M) did not prevent the potentiation induced by vasopressin. The results demonstrate that vasopressin exerts powerful constrictor action in human penile arteries and veins by direct stimulation of V1receptors. In addition, vasopressin strongly potentiates the contractions to norepinephrine and stimulation of perivascular adrenergic nerves. Consequently, the direct contractile effects of vasopressin together with its amplifying effects on adrenergic-mediated constriction should be taken into consideration in the overall regulation of penile erection and in those states characterized by increased plasma vasopressin levels.

Footnotes

  • Send reprint requests to: S. Lluch, M.D., Departamento de Fisiologı́a, Facultad de Medicina y Odontologı́a, Blasco Ibáñez, 17, 46010 Valencia, Spain. E-mail:medinap{at}post.uv.es

  • ↵1 This work was supported by the Comisión Interministerial de Ciencia y Tecnologı́a, Ministerio de Sanidad and Generalitat Valenciana.

  • Abbreviations:
    AVP
    arginine-vasopressin
    d(CH2)5Tyr(Me)AVP
    [(1-(β-mercapto-β,β-cyclopentamethylenepropionic acid)-2-(O-methyl)-tyrosine, 8-arginine) vasopressin]
    desmopressin
    deamino-8-d-arginine vasopressin
    • Received March 6, 1998.
    • Accepted May 5, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics
Vol. 286, Issue 3
1 Sep 1998
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Research ArticleArticle

Role of Vasopressin on Adrenergic Neurotransmission in Human Penile Blood Vessels

Gloria Segarra, Pascual Medina, Cristina Domenech, José M. Vila, Juan B. Martínez-León, Martín Aldasoro and Salvador Lluch
Journal of Pharmacology and Experimental Therapeutics September 1, 1998, 286 (3) 1315-1320;

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Research ArticleArticle

Role of Vasopressin on Adrenergic Neurotransmission in Human Penile Blood Vessels

Gloria Segarra, Pascual Medina, Cristina Domenech, José M. Vila, Juan B. Martínez-León, Martín Aldasoro and Salvador Lluch
Journal of Pharmacology and Experimental Therapeutics September 1, 1998, 286 (3) 1315-1320;
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