Vascular Biology |
BDependent Transcriptional Activation of Inducible NO Synthase
From the Department of Endocrinology and Metabolism, Dokkyo University School of Medicine, Mibu, Tochigi, Japan.
Correspondence to Dr Yoshiyuki Hattori, Department of Endocrinology and Metabolism, Dokkyo University School of Medicine, Mibu, Tochigi 321-0293, Japan. E-mail yhattori{at}dokkyomed.ac.jp
| Abstract |
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B system or alters expression
of the NF-
B target gene product, inducible NO synthase (iNOS),
in vascular smooth muscle cells (VSMCs) stimulated by
lipopolysaccharide (LPS) in combination with interferon
(IFN)-
(LPS/IFN). NO production induced by LPS/IFN was
dose-dependently inhibited by HNE. NF-
B activation by LPS/IFN was
inhibited by HNE in a dose-dependent manner. HNE significantly
decreased LPS/IFN-stimulated proteolysis of I
B-
. iNOS promoter
activity stimulated by LPS/IFN was also decreased by HNE
dose-dependently. The treatment of VSMCs with LPS/IFN strongly
stimulated iNOS mRNA and protein expression. The LPS/IFN-induced
increases in iNOS mRNA and protein levels were dose-dependently
decreased by HNE. Our data suggest that treatment with HNE blocks
signaling events required for I
B-
degradation, thereby preventing
NF-
B activation. Inhibition of NF-
Bregulated gene expression,
especially modulation of NO production, may contribute to
atherogenesis.
Key Words: 4-hydroxy-2-nonenal nuclear factor-
B nitric oxide vascular smooth muscle cells
| Introduction |
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Nuclear factor (NF)-
B, a pleiotropic transcription
factor, has been suggested to play an important role in gene regulation
during the inflammatory and immune reactions that promote
atherosclerotic
lesions.5 6 7
NF-
B regulates the inducible expression of a variety of genes
involved in inflammatory and immune responses, including inducible NO
synthase
(iNOS).8 9 10 11
NO appears to play a key role in mediating vascular
remodeling.12 13 14
HNE-modified lysine residues have been identified in atherosclerotic
lesions,15 and a variety of
HNE effects in different cell types have been
described.16 17 18 19 20
HNE may modulate arterial wall NO production in
atherosclerotic lesions.
In the present study, we sought to define the effects of
HNE on iNOS expression in vascular smooth muscle cells (VSMCs). We
investigated whether HNE is able to modulate activation of the NF-
B
system or alter the expression of the NF-
B target gene product
iNOS. We examined to what extent this aldehyde affects
B-dependent
and iNOS promoterdependent transcriptional activity, the expression
of iNOS mRNA and protein, and NO
production.
| Methods |
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Nitrite Assay
Nitrite accumulation, an indicator of NO synthesis,
was measured in the cell culture medium of confluent
VSMCs.23 Nitrite was
quantified colorimetrically after adding 100 µL of
Griess reagent (1% sulfanilamide and 0.1%
naphthylethylenediamine in 5% phosphoric acid) to 100-µL
samples. Absorbance at 550 nm was determined by using a microplate
reader (Molecular Devices). Nitrite
concentrations were calculated by comparison with the absorbance of
standard solutions of sodium nitrite prepared in cell culture
medium.
Cell Respiration
Cell respiration, an indicator of cell viability, was
assessed by the mitochondrial-dependent reduction of
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) to
formazan.24 To examine the
cytotoxic effect of HNE, the cells were incubated (37°C) with MTT
(0.4 mg/mL) for a further 60 minutes after a 24-hour incubation for
nitrite assay. Culture medium was removed by aspiration, and the cells
were solubilized in dimethyl sulfoxide. The extent of reduction of MTT
to formazan within cells was quantified by the measurement of
optical density at 550 nm. Formazan production is
compared with the values obtained from the control cells (no
HNE).
iNOS mRNA Analysis
An iNOS cDNA was kindly provided by Dr Y.
Nunokawa24A (Suntory Co,
Osaka, Japan) and labeled with
[
-32P]dCTP by random priming for use as
a Northern blot probe to assess iNOS mRNA expression. Northern blot
procedures were performed as previously
described.25 After probing
for iNOS expression, filters were stripped and reprobed for the
presence of GAPDH mRNA. The blots were exposed to an imaging plate
(Fuji Photo Film Co) at room temperature for 6 hours and
analyzed by using a FUJIX bioimaging analyzer
(BAS2000II, Fuji Photo Film Co).
NF-
B Activation
To study NF-
B activation, the cells were stably
transfected with a cis-reporter
plasmid containing a luciferase reporter gene linked to 5 repeats of
NF-
B binding sites (pNF
B-Luc,
Stratagene).25
For this, the pNF
B-Luc plasmid was transfected together with a
pSV2neo helper plasmid (Clontech) into rat VSMCs
by using the FuGEN 6 transfection reagent
(Boehringer-Mannheim). The cells were cultured in the presence
of G418 (Clontech) at a concentration of 500
µg/mL with medium replacement at 2- to 3-day intervals. Approximately
3 weeks later, G418-resistant clones were isolated by using a
cloning cylinder and analyzed individually for expression of
luciferase activity. Several clones were selected for analysis
of NF-
B activation. Luciferase activity was measured by using a
luciferase assay kit
(Stratagene).
iNOS Promoter Activity Assay
To study iNOS promoter function, VSMCs were stably
transfected with a construct containing a 1.7-kb fragment of the iNOS
promoter, which was cloned in front of a reporter gene encoding
secreted alkaline phosphatase (SEAP), as previously
described.26 27
SEAP activity, released into the cell culture medium, was measured by a
sensitive chemiluminescent assay (Phospha-Light,
TROPIX).
Western Blot of iNOS and I
B-
After treatment, VSMC monolayers were lysed by using
an electrophoresis sample buffer. The protein concentration of the
samples was measured by use of a Bio-Rad
detergent-compatible protein assay. Subsequently, ß-mercaptoethanol
was added to the samples at a final concentration of 1%, and samples
were denatured by boiling for 5 minutes. Samples containing 10 µg of
protein were electrophoresed on 7% SDS-polyacrylamide gels and
transferred to PVD membranes (Bio-Rad), which
were incubated with a rabbit polyclonal antibody against human
I
B-
(1:2000, Santa Cruz Biotechnology) or a mouse monoclonal IgG1
antibody against mouse iNOS (1:2000, Transduction
Laboratories). I
B-
antibody or iNOS antibody binding
was detected by using donkey anti-rabbit or sheep anti-mouse IgG
horseradish peroxidase (1:20 000) and the ECL Plus system
(Amersham).
Statistical Analysis
Data are presented as mean±SEM of
measurements in 2 or 3 different VSMC cell cultures. Multiple
comparisons were evaluated by ANOVA followed by the Fisher protected
least significant difference test. The Student unpaired
t test was used for comparisons
between 2 experiments. A value of
P<0.05 was considered
statistically significant.
| Results |
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|
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(LPS/IFN). A lag phase of 6 to 8 hours preceded the induction
of nitrite synthesis, followed by a progressive increase in nitrite
synthesis for at least 24 hours.
Studies with different concentrations of HNE (5 to 100
µmol/L) showed a concentration-dependent inhibition of nitrite
production when HNE was added to VSMCs before LPS/IFN
(Figure 1a
). Although 50 µmol/L HNE produced an
70% to
75% decline in nitrite production after LPS/IFN stimulation, 5
µmol/L HNE had little effect. Our cytotoxicity studies showed that
even at the highest concentration of HNE, only a marginal reduction in
cell viability was achieved (ie, there was little effect on MTT values
compared with the effect in the absence of HNE; inset to
Figure 1a
).
|
Time-course studies using a final concentration of 25
µmol/L HNE were conducted to determine whether HNE had a direct
affect on VSMC NO synthase (NOS) activity, ie, altered NOS expression
by VSMCs
(Figure 1b
). When HNE was added at increasing intervals after
the stimulation of VSMCs with LPS/IFN, the inhibition of nitrite
production decreased as the interval lengthened.
Next, experiments were performed to examine whether HNE
affects activation of the NF-
B system. NF-
B activation was
detected by measuring NF-
Bdependent transcription in rat VSMCs
stably transfected with a luciferase reporter construct. Cells were
treated with different concentrations of HNE and then stimulated with
LPS/IFN for 3 hours. In the absence of HNE, we observed the expected
activation of NF-
B by LPS/IFN. This increase was slightly affected
by HNE at 6.25 µmol/L, significantly decreased by 12.5 and 25
µmol/L, and completely abolished by 50 µmol/L. No effect of HNE
alone on NF-
B activity was observed
(Figure 2
). We then examined whether HNE could affect the
activation-induced proteolysis of the I
B inhibitor
protein that traps the NF-
B dimer in the cytosol. Incubation of
VSMCs with LPS/IFN over 1 hour led to a significant proteolysis of
I
B-
. HNE, when added before LPS/IFN, significantly decreased
LPS/IFN-stimulated proteolysis of I
B-
(Figure 3A
). Pretreatment with the proteosome
inhibitor MG115 also inhibited I
B-
degradation
(Figure 3B
).
|
|
We also tested whether HNE modulates activation of the iNOS
promoter. iNOS promoter function was determined by measuring iNOS
promoterdependent transcription in rat VSMCs stably transfected with
a SEAP reporter construct containing the iNOS promoter. iNOS promoter
activity increased in the cells treated with LPS/IFN by
5-fold
relative to unstimulated levels. This increase was dose-dependently
decreased by HNE
(Figure 4
).
|
Next, we investigated whether the inhibition of
transcriptional activity by HNE has a corresponding impact on gene and
protein expression. For this purpose, we evaluated iNOS mRNA levels and
iNOS protein levels by Northern and Western blot analyses and
NO production by monitoring the accumulation of nitrite in the
cell supernatant. Although iNOS mRNA levels approached the detection
limit by Northern blot analysis in unstimulated VSMCs,
treatment with LPS/IFN provided a strong stimulus for iNOS mRNA
expression. The LPS/IFN-induced increase in iNOS mRNA level was
dose-dependently decreased by HNE
(Figure 5
). As shown in
Figure 6
, iNOS protein levels were very low in unstimulated
cells. Treatment with LPS/IFN caused a substantial induction of iNOS
protein expression in the cells. This induction of iNOS protein was
significantly decreased by HNE at 12.5 µmol/L and abolished at 50
µmol/L.
|
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| Discussion |
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B and
B-dependent transcription in VSMCs. Furthermore, iNOS
promoterdependent transcription and the induction of iNOS mRNA and
protein were dose-dependently reduced in the presence of HNE, which
implies that the effect of HNE on the NF-
B system is associated with
functional consequences. Indeed, HNE inhibited the induction of NO
production in VSMCs stimulated with LPS/IFN.
Our data show that HNE prevented the degradation of the
cytosolic NF-
B inhibitor protein I
B-
after LPS/IFN
stimulation. Our cytotoxicity studies show that even at the highest
concentration of HNE, only a marginal reduction in cell viability was
achieved. I
B proteolysis is mediated by the
proteosome,28 and our data
show that a proteosome inhibitor blocked degradation of
I
B. Thus, the inhibitory effect of HNE on NF-
B is not
due to general cytotoxicity, but HNE appears to selectively block
signaling events that are required for I
B degradation, thereby
preventing NF-
B activation. It has been reported that in cells of
the monocytic lineage, HNE specifically prevents LPS-induced
phosphorylation of I
B-
, whereas the profound
effect of HNE on NF-
B is not due to interference with the
LPS-binding properties of the
cells.20 The authors suggest
that HNE appears to inhibit I
B phosphorylation at a
signaling stage located downstream from the LPS receptor level. This is
also likely to be one of the mechanisms involved in HNE inhibition of
the NF-
B system in VSMCs, and the detailed mechanism by which this
occurs, including HNE-induced I
B degradation in stimulated VSMCs, is
currently under investigation.
Atherosclerosis is associated with reduced endothelium-dependent vasodilation, which has been ascribed to reduced NO formation.29 30 Constitutively expressed endothelial NOS is responsible for the regulated production of NO in arteries, whereas iNOS is expressed under inflammatory conditions.12 13 14 The loss of endothelial NOS may be compensated for by increased iNOS expression. As shown previously, HNE is present in atherosclerotic lesions.2 15 Because HNE can cause oxidative stress and inhibit iNOS, the antiatherogenic effects of NO and the ratio of NO to superoxide anion may be reduced in atherosclerotic arteries, leading to very rapid reaction of NO with superoxide anion and production of highly reactive peroxynitrite, which can directly damage lipids and protein.
It has been reported that HNE induced relaxation of human
cerebral arteries31 and
mesenteric arteries32 in an
endothelium-dependent manner. HNE could induce
intracellular peroxide
production33 in
endothelial cells, which may be a mediator of
endothelium-dependent
relaxation.34 It should be
evaluated whether HNE causes endothelial cell NOS
dysfunction, which could trigger the compensatory response (superoxide
anion generation followed by hydrogen peroxide production),
possibly representing an important mechanism underlying
oxidative vascular injury.34
HNE treatment of the cells resulted in depletion of intracellular
glutathione (GSH).33 GSH
plays an important role in the maintenance of the intracellular
redox balance and the regulation of several redox-sensitive
transcription factors, such as NF-
B. Because the ability of LPS or
cytokines to induce NF-
B activation has been shown to be
dependent on the generation of cellular redox stress, decreased GSH
levels could lead to enhanced response of NF-
B activation, thereby
increasing iNOS induction. Although activation signals initiating
protein kinase signaling cascades that result in the
phosphorylation of I
B on degradation by the
proteosome could be boosted by depleted GSH levels with HNE treatment,
HNE does selectively block signaling events that are required for
I
B-
degradation. Therefore, it is unlikely that HNE permits
NF-
B to translocate to the nucleus and bind its recognition elements
within the promoter regions of NF-
B responsive genes, including
iNOS.
It has been reported that HNE was found to be toxic to cells at high concentrations, whereas lower concentrations induced cell growth and DNA synthesis.35 36 37 Similar effects have been observed with other oxidation products, such as H2O2 and oxidized LDL, which, over a narrow concentration range, can cause proliferative and cytotoxic effects.38 39 HNE may exhibit concentration-dependent effects, modulating the expression of different genes at different concentrations. This may be relevant in atherogenesis, in which cell growth, apoptosis, and necrosis are thought to contribute equally to lesion formation.
In conclusion, our data suggest that the aldehyde HNE is one
of the active components in oxidized LDL responsible for the
inhibitory capacities of this lipoprotein on the NF-
B
system. Treatment with HNE appears to selectively block signaling
events that are required for I
B-
degradation, thereby preventing
NF-
B activation. Inhibition of NF-
Bregulated gene expression,
especially modulation of NO production, may contribute to
certain stages of atherogenesis.
| Acknowledgments |
|---|
Received February 28, 2001; accepted March 6, 2001.
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