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Department of Cardiovascular Medicine and
* Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;
Division of Gene Therapy Sciences, Osaka University Medical School, Osaka, Japan; and
New Product Research Laboratories, Daiichi Pharmaceutical Co., Tokyo, Japan
1Correspondence: Department of Cardiovascular Medicine, Graduate School of Medical Science, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. E-mail: egashira{at}cardiol.med.kyushu-u.ac.jp
| ABSTRACT |
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Key Words: endothelium-derived relaxing factors remodeling growth substances inflammation adhesion molecule monocyte chemoattractant protein-1 gene transfer
| INTRODUCTION |
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We performed the present study to evaluate the use of gene therapy to
block MCP-1 activity in vivo using an amino-terminal
deletion mutant of MCP-1 called 7ND, which lacks the amino-terminal
amino acids 2 to 8. This mutant MCP-1 has been shown to bind to the
receptor for MCP-1 (CCR2) and subsequently block MCP-1-mediated
monocyte chemotaxis (3
, 8)
. We hypothesized that for this
approach to work, the cells infected with 7ND must secrete 7ND protein
into the circulating blood and the 7ND protein must bind to the MCP-1
receptor on monocytes or target cells in remote organs, and thus block
the signal of MCP-1. Such blockade of MCP-1 activity would suppress
MCP-1-mediated inflammation and thereby improve the function of the
target organs. If this approach proves successful, direct gene transfer
into the target organ will not be necessary. The use of skeletal muscle
as a biofactory to produce a secreted protein has been reported
previously (9)
. Therefore, we tested the effectiveness of
this new strategy in a rat model in which the chronic inhibition of
nitric oxide synthesis (NO) by the administration of
N
-nitro-L-arginine methyl ester (L-NAME)
induces early vascular inflammation (monocyte infiltration into the
blood vessel wall and MCP-1 expression) and subsequently causes
arteriosclerosis (medial thickening and fibrosis)
(10
11
12
13)
. Inhibition of NO synthesis has been shown to
up-regulate cell adhesion molecules and/or MCP-1 in cultured
endothelial cells through the increases in oxidative stress and/or the
activity of nuclear factor
B (14
15
16
17)
.
| MATERIALS AND METHODS |
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An animal model of chronic inhibition of NO synthesis
Three groups of WKY rats were studied: The control rats received
untreated chow and drinking water. The second group received L-NAME
after an intramuscular (i.m.) injection of phosphate-buffered saline
(PBS). The third group received L-NAME after an i.m. injection of
HVJliposome complex containing the 7ND gene. On the 3rd day or 28th
day of treatment, the systolic blood pressure was measured by the
tail-cuff method. Venous blood was then collected and the rats were
killed for morphometric, immunohistochemical, and biochemical analysis.
The hearts were isolated and either fixed in a methacarn solution for
histological analysis or snap-frozen in liquid nitrogen and stored at
-80°C.
Histopathology and immunohistochemistry
Tissue sections were either stained with Masson-trichrome or
subjected to immunostaining using antibodies against
macrophage/monocyte (ED1, Serotec, Berlin, Germany),
proliferating cell nuclear antigen (PCNA) (Dako, Carpinteria,
Calif.), or non-immune mouse IgG (Zymed, San Francisco, Calif.).
The slides were washed and incubated with biotinylated,
affinity-purified goat anti-rabbit IgG. After avidin-biotin
amplification, the slides were incubated with 3',3'-diaminobenzidine
and counterstained with hematoxylin.
In situ hybridization
Four rats in the control and L-NAME+PBS groups were killed on
the third day of treatment. Digoxigenin-labeled single-strand RNA
probes (sense and antisense) were generated using a DIG RNA labeling
kit (Boehringer Mannheim, Mannheim, Germany) according to the
manufacturers protocol. Rat MCP-1 probes, a 665 or 930 base pair
fragment of the rat MCP-1 cDNA, were used. In situ
hybridization was performed on 2% paraformaldehyde-embedded sections
as described (18)
.
Morphometry and cell counting
Morphometry and cell counting were performed by a single
observer who was blind to the treatment protocols. Each section (five
per heart) stained with an antibody against ED1 or PCNA was scanned.
The number of positive cells in each section was determined. The
average number of positive cells per section was determined for each
animal.
To evaluate the thickening of the coronary arterial wall and the extent
of perivascular fibrosis, short-axis images of the coronary arteries
were analyzed. (10
, 11
, 13)
The inner border of the lumen
and the outer border of the tunica media were traced from the
Masson-trichrome stained sections. The wall-to-lumen ratio (the ratio
of the medial thickness to the internal diameter) and the area of
fibrosis (collagen deposition stained with aniline blue) immediately
surrounding the blood vessels were then calculated. Perivascular
fibrosis was estimated as the ratio of the area of fibrosis surrounding
the vessel wall to the total vessel area.
Northern blot analysis
Total RNA was extracted from each sample, poly(A)+ RNA was
purified, and then Northern blot hybridization was performed as we have
described previously (11)
. The cDNA probes used were human
7ND (8)
and mouse GAPDH (American Type Culture Collection,
Rockville, Md.).
Western blot analysis
After immunoprecipitation, the FLAG Western Detection kit
(Stratagene, #200470) was used to detect FLAG protein in the serum.
Statistical analysis
Data are expressed as the mean ± SE.
Statistical analysis of differences was compared by ANOVA and
Bonferronis multiple comparison tests. A level of P <
0.05 was considered statistically significant.
| RESULTS |
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Three days after rats were injected with the 7ND gene or PBS,
recombinant human MCP-1 (1 µg/20 µl) or vehicle (PBS 20 µl) was
injected into the dermis. Twenty-four hours after the intradermal
injection, histopathologic sections of the injected sites were prepared
and the ED1-positive monocytes that were recruited into the injected
site were counted (19)
. In the rats receiving PBS, the
number of monocytes recruited into the dermis was significantly greater
in the areas of MCP-1 injection than in the areas of vehicle injection
(Fig. 1C
). This increase in ED1-positive monocytes was
blocked by the i.m. injection of the 7ND gene.
| Effects of the i.m. expression of 7ND on monocyte recruitment and coronary vascular remodeling |
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On day 28, significant structural changes in the coronary arteries were
evident in rats treated with L-NAME+PBS. Treatment with L-NAME+7ND
prevented any increase in medial thickening (the wall-to-lumen ratio)
but progression of perivascular and cardiac fibrosis was unaffected
(Fig. 2
and Fig. 4
).
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Compared with the control group, the L-NAME+ 7ND-transfected and
L-NAME+PBS groups had a higher systolic arterial pressure on days 3 and
28 of treatment (Table 1
). There was no significant difference in the white blood cell count in
peripheral blood among the three groups (data not shown).
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| DISCUSSION |
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In contrast, the 7ND gene transfer could not reduce the development of
perivascular fibrosis or arterial hypertension induced by the chronic
inhibition of NO synthesis. These findings suggest that MCP-1 is
essential for the formation of early inflammatory changes as well as
the subsequent medial thickening but not for fibrogenesis. Furthermore,
our data suggest that the observed effects of 7ND gene transfer are
independent of the arterial hypertension induced by the blockade of NO
synthesis in this experimental model. Since the recruitment and
activation of monocytes as well as the proliferation of vascular smooth
muscle cells are essential steps in the pathogenesis of many vascular
diseases (1
, 2)
, 7ND gene transfer would reduce the
neointimal formation after vascular injury or inhibit the
transformation from a stable to an unstable plaque prone to rupture.
Therefore, our strategy could be a promising form of gene therapy
against vascular diseases in humans such as restenosis after
angioplasty or an unstable atheromatous plaque prone to rupture.
Although no apparent side effects were observed during the period of
this study, careful observation over a longer period of time needs to
be done in future studies.
In conclusion, this study has shown that the i.m. expression of 7ND can effectively block MCP-1 activity in remote organs. This new strategy may be useful for clarifying the role of MCP-1 under pathophysiologic conditions in vivo, especially in organs into which direct gene transfer is difficult.
| ACKNOWLEDGMENTS |
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Received for publication March 14, 2000.
Revision received March 15, 2000.
| REFERENCES |
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