Integrative Physiology |
1 and ß1 Gene Transfer Increases NO Responsiveness and Reduces Neointima Formation After Balloon Injury in Rats via Antiproliferative and Antimigratory Effects
From the Center for Transgene Technology and Gene Therapy (P.S., Z.N., O.V., H.G., D.C., S.J.), Flanders Interuniversity Institute for Biotechnology, and the Cardiac Unit (P.S., N.V.P., S.J.), University Hospital Gasthuisberg, University of Leuven, Belgium, and Cardiovascular Research Center and Cardiology Division, Department of Medicine (J-D.C., K.D.B.), Massachusetts General Hospital, Harvard Medical School, Boston, Mass.
Correspondence to Stefan Janssens, MD, PhD, Cardiac Unit and Center for Transgene Technology and Gene Therapy, KU-Leuven, Campus Gasthuisberg, Herestraat 49, B-3000, Leuven, Belgium. E-mail stefan.janssens{at}med.kuleuven.ac.be
AbstractIn
vascular smooth muscle cells, NO stimulates the synthesis of cGMP by
soluble guanylate cyclase (sGC), a heterodimer composed of
1 and ß1 subunits.
NO/cGMP signal transduction affects multiple cell functions that
contribute to neointima formation after vascular injury.
Balloon-induced vascular injury was found to decrease sGC subunit
expression and enzyme activity in rat carotid arteries. The effect of
restoring sGC enzyme activity on neointima formation was investigated
using recombinant adenoviruses specifying sGC
1 and ß1 subunits
(Ad
1 and Adß1). Coinfection of cultured rat aortic smooth muscle
cells with Ad
1 and Adß1 increased NO-stimulated intracellular cGMP
levels 60-fold and decreased DNA synthesis and migration by 16% and
48%, respectively. Immunoreactivity for
1
and ß1 subunits colocalized in carotid
arteries infected with Ad
1 and Adß1. Molsidomine-stimulated
carotid tissue cGMP levels were greater after coinfection with Ad
1
and Adß1 than after infection with a control virus, AdRR5 (0.53±0.09
pmol/mg protein, mean±SEM, versus 0.23±0.09,
P<0.05). Mean intima/media
ratio, 2 weeks after balloon injury and twice-daily administration of 5
mg/kg molsidomine, was less in rats coinfected with Ad
1 and Adß1
than in rats infected with AdRR5 or in uninfected rats (0.36±0.11
versus 0.81±0.13 and 0.75±0.25, respectively,
P<0.05). Thus, Ad
1 and
Adß1 gene transfer to balloon-injured rat carotid arteries increases
NO responsiveness and attenuates neointima formation via a direct
antiproliferative and antimigratory effect on vascular smooth muscle
cells.
Key Words: cyclic GMP soluble guanylate cyclase nitric oxide adenovirus gene therapy
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