Pulmonary vasodilator responses to RP 52891 are mediated by activation of a glibenclamide-sensitive K+ATP channel.

Journal Article (Journal Article)

Pulmonary vasodilator responses to the K+ATP channel opener, RP 52891, were investigated in the intact-chest cat under constant flow conditions. When pulmonary vascular tone was increased with U46619, intralobar injections of RP 52891 caused dose-related decreases in lobar arterial and systemic arterial pressures without altering left atrial pressure. RP 52891 was more potent than pinacidil but less potent than cromakalim in dilating the pulmonary vascular bed. Pulmonary vasodilator responses to RP 52891, cromakalim and pinacidil, but not to acetylcholine, nitroprusside or isoproterenol, were blocked by glibenclamide. These data demonstrate that RP 52891 has potent pulmonary vasodilator activity in the cat and suggest that responses are due to opening of a glibenclamide-sensitive K+ATP channel.

Full Text

Duke Authors

Cited Authors

  • Hood, JS; McMahon, TJ; Kadowitz, PJ

Published Date

  • September 4, 1991

Published In

Volume / Issue

  • 202 / 1

Start / End Page

  • 121 - 124

PubMed ID

  • 1786798

International Standard Serial Number (ISSN)

  • 0014-2999

Digital Object Identifier (DOI)

  • 10.1016/0014-2999(91)90265-r


  • eng

Conference Location

  • Netherlands