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Vol. 62, Issue 4, 927-935, October 2002
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-
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-
and the G-protein Raf-1, an upstream activator of the
extracellular signal-regulated kinase signaling pathway, was detected
in cells overexpressing PKG1-
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.
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