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Vol. 62, Issue 4, 927-935, October 2002

Activation of the Mitogen Activated Protein Kinase Extracellular Signal-Regulated Kinase 1 and 2 by the Nitric Oxide-cGMP-cGMP-Dependent Protein Kinase Axis Regulates the Expression of Matrix Metalloproteinase 13 in Vascular Endothelial Cells

Carlos Zaragoza, Estrella Soria, Esther López, Darren Browning, Milagros Balbín, Carlos López-Otín, and Santiago Lamas

Centro de Investigaciones Biológicas, Instituto "Reina Sofía" de Investigaciones Nefrológicas, Consejo Superior de Investigaciones Científicas, and Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.Z., E.S., E.L., S.L.); Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología, Universidad de Oviedo, Oviedo, Spain (M.B., C.L.-O.); and Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta, Georgia (D.B.)

Matrix metalloproteinases (MMPs) are synthesized in response to diverse stimuli, including cytokines, growth factors, hormones, and oxidative stress. Here we show that the nitric oxide (NO) donor 2-(N,N-diethylamino)-diazenolate-2-oxide (DEA-NO) and NO from murine macrophages transcriptionally regulate MMP-13 expression in vascular endothelial cells (BAEC). The cGMP analog, 8-bromo-cGMP (8-Br-cGMP) mimicked the effect of NO, whereas incubation with the guanylate cyclase inhibitor 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one, or the cGMP-dependent protein kinase (PKG) inhibitor phenyl-1,N 2- etheno-8-bromoguanosine-3',5'-cyclic monophosphorothioate, Rp-isomer (PET) reduced the stimulatory effect of DEA-NO on the activation of the MMP-13 promoter. Overexpression of the catalytic subunit of PKG1-alpha resulted in a 5- to 6-fold increase of the MMP-13 regulatory region over control cells. On the other hand, incubation with the mitogen-activated protein/extracellular signal-regulated kinase inhibitor 2'-amino-3'-methoxyflavone (PD98059) significantly reduced DEA-NO and 8-Br-cGMP promoter activation and mRNA expression of MMP-13 in transfected BAEC. Moreover, a complex between PKG1-alpha and the G-protein Raf-1, an upstream activator of the extracellular signal-regulated kinase signaling pathway, was detected in cells overexpressing PKG1-alpha or treated either with DEA-NO or 8-Br-cGMP. Thus, we propose that the NO-cGMP-PKG pathway enhances MMP-13 expression by the activation of ERK 1,2. This effect of NO may be the result of pathophysiological importance in the context of inflammation or atherogenesis.


Copyright © 2002 by The American Society for Pharmacology and Experimental Therapeutics



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