Differential relaxing responses to particulate or soluble guanylyl cyclase activation on endothelial cells: A mechanism dependent on PKG-Iα activation by NO/cGMP
Authors
Rivero Vilches, Francisco Javier; Frutos García, Sergio de; Saura Redondo, Marta; Rodríguez Puyol, Diego María; Rodríguez Puyol, Manuel AntonioIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/60934DOI: 10.1152/ajpcell.00590.2002
ISSN: 0002-9513
Date
2003-10-01Affiliation
Universidad de Alcalá. Departamento de Biología de Sistemas; Universidad de Alcalá. Departamento de Medicina y Especialidades MédicasBibliographic citation
American Journal of Physiology, 2003, v. 285, n. 4, p. 891-898
Keywords
nitric oxide
C-type natriuretic peptide
myosin light chainc
GMP-dependent protein kinase type I alpha endothelial cell barrier dysfunction
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/aceptedVersion
Rights
© 2003 the American Physiological Society
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Access rights
info:eu-repo/semantics/openAccess
Abstract
cGMP is generated in endothelial cells after stimulation of soluble guanylyl cyclase (sGC) by nitric oxide (NO) or of particulate guanylyl cyclase (pGC) by natriuretic peptides (NP). We examined whether localized increases in cytosolic cGMP have distinct regulatory roles on the contraction induced by H2O2 treatment in human umbilical vein endothelial cells. cGMP concentrations and temporal dynamics were different upon NO stimulation of sGC or C-type NP (CNP) activation of pGC and did not correlate with their relaxing effects measured as planar cell surface area after H2O2 challenge. cGMP production due to sGC stimulation was always smaller and more brief than that induced by pGC stimulation with CNP, which was greater and remained elevated longer. The NO effects on cell relaxation were cGMP dependent because they were blocked by sGC inhibition with 1H-(1,2,4)Oxadiazolo(4,3-a)quinoxaline-1-one and mimicked by 8-Br-cGMP. An antagonist of the cGMP-dependent protein kinase type-I (PKG-I) also inhibited the NO-induced effects. The cell contraction induced by H2O2 produces myosin light chain (MLC) phosphorylation and NO prevented it completely, whereas CNP only produced a partial inhibition. Transfection with a dominant negative form of PKG type-Ialpha completely reversed the NO-induced effects on MLC phosphorylation, whereas it only partially inhibited the effects due to CNP. Taken together, these results demonstrate that the NO/sGC/cGMP pathway induces endothelial cell relaxation in a more efficient manner than does CNP/pGC/cGMP pathway, an effect that might be related to a selective stimulation of PKG-1alpha by NO-derived cGMP. Consequently, stimulated PKG-Ialpha may phosphorylate important protein targets that are necessary to inhibit the endothelial contractile machinery activated by oxidative stress.
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