Effect of rho-kinase inhibition on vasoconstriction in the penile circulation

Thomas M. Mills, Kanchan Chitaley, Christopher J. Wingard, Ronald W. Lewis, R Clinton Webb

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

A recent report from this laboratory (Chitaley K, Wingard C, Webb R, Branam H, Stopper V, Lewis R, and Mills T. Nature Medicine 7: 119-122, 2001) showed that inhibition of Rho-kinase increased the erectile response (intracavernosal pressure and mean arterial pressure) by a process that does not require nitric oxide or cGMP. The present study investigated whether vasoconstrictor agents, which are active in the penis, act via the Rho-kinase pathway. Western analysis revealed RhoA and Rho-kinase protein in the penis. Treatment with the selective Rho-kinase inhibitor Y-27632 significantly increased the magnitude of the erectile response. Intracavernous administration of endothelin-1 (ET-1; 50 pmol) or methoxamine (10 μg/kg) reduced the erectile response to autonomic stimulation. If Y-27632 was given before ET-1 or methoxamine, the vasoconstrictor effect was reduced, and intracavernosal pressure and mean arterial pressure remained elevated. However, when given after methoxamine, Y-27632 had a reduced vasodilatory effect, and Y-27632 had no vasodilatory effect when given after ET-1. These findings suggest that ET-1 and methoxamine increase Rho-kinase activity in the cavernous circulation and support the hypothesis that the vasoconstriction that maintains the penis in the nonerect state is mediated, in part, by the Rho-kinase pathway.

Original languageEnglish (US)
Pages (from-to)1269-1273
Number of pages5
JournalJournal of Applied Physiology
Volume91
Issue number3
StatePublished - Sep 12 2001

Fingerprint

rho-Associated Kinases
Vasoconstriction
Methoxamine
Penis
Vasoconstrictor Agents
Arterial Pressure
Pressure
Endothelin-1
Nitric Oxide
Medicine
Y 27632
Proteins

Keywords

  • Endothelin-1
  • Methoxamine
  • Penile erection
  • Penis
  • Vasodilation

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Mills, T. M., Chitaley, K., Wingard, C. J., Lewis, R. W., & Webb, R. C. (2001). Effect of rho-kinase inhibition on vasoconstriction in the penile circulation. Journal of Applied Physiology, 91(3), 1269-1273.

Effect of rho-kinase inhibition on vasoconstriction in the penile circulation. / Mills, Thomas M.; Chitaley, Kanchan; Wingard, Christopher J.; Lewis, Ronald W.; Webb, R Clinton.

In: Journal of Applied Physiology, Vol. 91, No. 3, 12.09.2001, p. 1269-1273.

Research output: Contribution to journalArticle

Mills, TM, Chitaley, K, Wingard, CJ, Lewis, RW & Webb, RC 2001, 'Effect of rho-kinase inhibition on vasoconstriction in the penile circulation', Journal of Applied Physiology, vol. 91, no. 3, pp. 1269-1273.
Mills, Thomas M. ; Chitaley, Kanchan ; Wingard, Christopher J. ; Lewis, Ronald W. ; Webb, R Clinton. / Effect of rho-kinase inhibition on vasoconstriction in the penile circulation. In: Journal of Applied Physiology. 2001 ; Vol. 91, No. 3. pp. 1269-1273.
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