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J Biol Chem, Vol. 273, Issue 51, 34263-34271, December 18, 1998
From the a Department of Anesthesia and Critical Care, the
b Cardiovascular Research Center, the h Cardiology
Division, the e Arthritis Unit, and the f Molecular
Hepatology Division of the General Medical Services, Studies in vitro have underestimated
the importance of cGMP-dependent protein kinase (PKG) in
the modulation of vascular smooth muscle cell (SMC) proliferation and
apoptosis in vivo. This is attributable, in part, to a
rapid decline in PKG levels as vascular SMC are passaged in culture. We
used a recombinant adenovirus encoding PKG (Ad.PKG) to augment kinase
activity in cultured rat pulmonary artery SMC (RPaSMC). Incubation of
Ad.PKG-infected RPaSMC (multiplicity of infection = 200) with
8-Br-cGMP decreased serum-stimulated DNA synthesis by 85% and
cell proliferation at day 5 by 74%. The effect of 8-Br-cGMP on
DNA synthesis in Ad.PKG-infected RPaSMC was blocked by KT5823
(PKG inhibitor), but not by KT5720 (cAMP-dependent protein
kinase inhibitor). A nitric oxide (NO) donor compound, S-nitrosoglutathione, at concentrations as low as 100 nM, inhibited DNA synthesis in Ad.PKG-infected RPaSMC, but
not in uninfected cells or in cells infected with a control adenovirus.
In addition, 8-Br-cGMP and S-nitrosoglutathione induced
apoptosis in serum-deprived RPaSMC infected with Ad.PKG, but not in
uninfected cells or in cells infected with a control adenovirus. These
results demonstrate that modulation of PKG levels in vascular SMC can
alter the sensitivity of these cells to NO and cGMP. Moreover, these
observations suggest an important role for PKG in the regulation of
vascular SMC proliferation and apoptosis by NO and cGMP.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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