Rapid Communications |
From the Departments of Geriatric Medicine and Pharmacology (T.M., N.K., T.S., T.M., T.K.), Graduate School of Medicine, Kyoto University, Kyoto, Japan, and the Department of Biomedical Engineering (R.K., J.A.), Graduate School of Medicine, University of Tokyo, Tokyo, Japan. The present address for Dr Murase is Biological Science Laboratories, Kao Corp, Ichikaimachi, Tochigi, Japan.
Correspondence to Noriaki Kume, MD, PhD, Department of Geriatric Medicine, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan. E-mail nkume{at}kuhp.kyoto-u.ac.jp
| Abstract |
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Key Words: atherosclerosis oxidized LDL fluid shear stress intracellular Ca2+ C-type lectin
| Introduction |
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B (NF-
B),31 33 and Egr-1 (an
early growth response gene product),34 35 and
may potentially affect vascular tone, thrombus formation, and
atherogenesis.1 36
On the other hand, oxidatively modified LDL (Ox-LDL) has been
suggested to play key roles in atherogenesis. In particular, modulation
of endothelial functions elicited by Ox-LDL and its
lipid constituents has been implicated in the initiation of this
complex disease process.36 37 We have recently
identified a novel endothelial receptor for Ox-LDL,
designated lectin-like Ox-LDL receptor-1 (LOX-1), whose structure
belongs to the C-type lectin family.38 LOX-1 is
expressed in vascular endothelium in vivo in
arterial and aortic endothelial cells,
including atherosclerotic lesions.38 Functional
analysis revealed that LOX-1 expressed on the surface of
endothelial cells supports binding, internalization,
and proteolytic degradation of Ox-LDL. With regard to transcriptional
regulation of LOX-1, an inflammatory stimulus, such as tumor necrosis
factor-
, appears to stimulate transcription of the LOX-1
gene.38A LOX-1 expression in vivo also has been
shown to be upregulated in the aortas and veins of hypertensive
rats.39 Therefore, we have tested the hypothesis
that expression of LOX-1 can be modulated by fluid mechanical stimuli
in vascular endothelial cells.
In the present study, we provide evidence that fluid shear stress is a potent stimulus to transcriptionally induce the expression of LOX-1 in cultured bovine aortic endothelial cells (BAECs).
| Materials and Methods |
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Cell Culture
BAECs were isolated by scraping the inner surface of bovine
aortas with a glass coverslip and cultured in DMEM containing 10%
heat-inactivated FCS in an atmosphere of 95% air/5%
CO2 at 37°C as previously
described.38 For shear experiments, BAECs were
seeded on collagen-coated glass slides (70x100 mm) in DMEM with
10% FCS. Before experiments, BAECs on the glass slides were incubated
with serum-free DMEM for 24 hours.
Shear Stress Apparatus
A parallel-plate type of flow chamber was used to produce
laminar flow as previously described.15 16 17 20 In
brief, BAECs were cultured on glass plates and loaded into a
rectangular parallel-plate flow chamber. Shear stress was increased
suddenly from 0 (static) to 15 dyne/cm2 (or the
indicated intensities of shear stress) and was maintained at the same
level for the time periods indicated for each experiment. Culture media
were recirculated into the chamber and kept at a constant temperature
of 37°C with a gas mixture of 95% air/5%
CO2.
Northern Blot Analysis
BAECs were washed in PBS, and total RNA was isolated using
Isogen. Equal amounts (10 µg) of total RNA were subjected to
electrophoresis through 1% agarose/formamide gels and blotted onto
Hybond-N+ membranes. Hybridization and detection were performed by
fluorescein-labeled cDNA using the Gene Image random prime
labeling and detection system (Amersham) according to the
manufacturer's instructions. In brief, the blots were prehybridized
for 6 hours at 65°C in a solution containing 5% (wt/vol) dextran
sulfate, 5x SSC, 0.1% (wt/vol) SDS, and blocking reagent and
subsequently hybridized with a fluorescein-labeled cDNA
probe at 65°C overnight. The membranes were washed with 1x SSC and
0.1% (wt/vol) SDS for 15 minutes and then washed with 0.1x SSC and
0.1% (wt/vol) SDS for 15 minutes at 65°C. After nonspecific binding
of antibodies was blocked, the membranes were incubated with alkaline
phosphataselabeled anti-fluorescein antibody for 1 hour
and then detected by chemiluminescence (CDP-star reagent, Amersham).
Densitometric scanning was performed to quantify the amounts of mRNA
using NIH Image. Amounts of LOX-1 mRNA were normalized with the amounts
of GAPDH mRNA.
Western Blot Analysis
BAECs were washed in PBS and lysed in buffer containing
62.5 mmol/L Tris-HCl, 2% (wt/vol) SDS, and 10% (vol/vol)
glycerol. Equal protein concentrations of the lysates were subjected to
SDS-polyacrylamide (10%) gel electrophoresis, followed by
electroblotting onto an Immobilon PVDF transfer membrane. Determination
of protein concentrations was carried out by the method of
Lowry. Blotted membranes were probed with a mouse monoclonal
antibody directed to bovine LOX-1,38 incubated
with horseradish peroxidaselabeled-anti-mouse immunoglobulin for 1
hour, washed with PBS containing 0.1% (vol/vol) Tween 20, and then
detected by ECL Western blotting detection reagents. Densitometric
scanning was performed to quantify the amounts of LOX-1 protein using
NIH Image.
Nuclear Runoff Assay
Nuclear runoff assay was performed as previously
described,40 with minor modification. Briefly,
the cells were washed with ice-cold PBS and lysed with 0.5% Nonidet
P-40 solution (10 mmol/L Tris-HCl, 10 mmol/L NaCl, 3
mmol/L MgCl2, and 0.5% NP-40 [vol/vol], pH
7.4). The nuclei were isolated by centrifugation and
resuspended in a 40% glycerol buffer (50 mmol/L Tris-HCl, 40%
[vol/vol] glycerol, 5 mmol/L MgCl2, and
0.1 mmol/L EDTA, pH 8.3). Nascent transcription in vitro was
performed with [32P]UTP and other unlabeled
nucleotides at 30°C for 30 minutes. Transcribed RNA was
isolated by Isogen-LS, followed by denaturation with sodium hydroxide
and ethanol precipitation. Linearized target cDNAs (5
µg in plasmid form) were alkali-denatured and immobilized
onto Hybond-N+ membranes using a slot blot apparatus
(Schleicher & Shuell Inc). The membranes were hybridized with
transcribed RNAs containing an equal amount of radioactivity in a
solution containing 50% (vol/vol) formamide, 5x SSPE (1x SSPE
consists of 0.15 mol/L NaCl, 10 mmol/L
NaH2PO3, and 1 mmol/L
EDTA, pH 7.4), 0.1% (wt/vol) SDS, 10% (vol/vol) Denhardt's solution,
and denatured salmon sperm DNA at 42°C for 36 hours. Filters were
washed in 1x SSC with 0.1% (wt/vol) SDS for 15 minutes at room
temperature, washed with 0.2x SSC supplemented with 0.1% (wt/vol) SDS
for 10 minutes at 42°C, and then autoradiographed with Fujix Bioimage
Analyzer BAS2000 (Fuji Photo Film).
| Results |
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To examine shear-force dependence in LOX-1 expression, confluent BAECs
were exposed to a broad range of shear stresses (1 to 15
dyne/cm2) for 8 hours. These levels of shear
stress appear to be within the physiological range
of shear stress in vivo and have been shown to regulate a variety of
endothelial genes in vitro. As shown in Figure 2A
and 2B
, shear stress force-dependently
induced the expression of LOX-1 protein; increased amounts of LOX-1
protein were detectable in BAECs exposed to shear stress as low as 1 to
2 dyne/cm2. Elevated levels of LOX-1 mRNA were
observed in BAECs stimulated with shear stress as low as 2
dyne/cm2 (Figure 2C
).
|
To explore whether continuous exposure to shear stress is needed in
induced expression of LOX-1, BAECs that had been exposed to shear
stress for the indicated time periods were switched to a static
condition for the residual time periods. BAECs that were exposed to
shear stress for an initial 30 minutes and then cultured in a static
condition showed elevated levels of LOX-1 mRNA expression after 4 hours
that were almost equal to those in BAECs exposed continuously to shear
stress for 4 hours (Figure 3
). These
results indicate that the initial changes in fluid shear stress may be
crucial in the induced expression of LOX-1.
|
Shear StressInduced LOX-1 Expression Does Not Require De Novo
Protein Synthesis
To test whether de novo protein synthesis is necessary for the
shear stressinduced LOX-1 mRNA expression, cycloheximide was added to
BAECs 1 hour before the application of shear stress. The inhibition of
the cellular protein synthesis by cycloheximide was accompanied by
increased basal LOX-1 levels, thought to be due to
"superinduction," and increased LOX-1 mRNA levels in the static
cells were the same as the levels in cells subjected to shear stress of
15 dyne/cm2 (Figure 4
). When cycloheximide-treated cells were
subjected to shear stress, levels for LOX-1 mRNA in these cells were
again higher than those in cycloheximide-treated cells. Taken together,
de novo protein synthesis is not necessary for shear stressinduced
LOX-1 gene expression, but protein synthesis inhibition superinduced
LOX-1 mRNA.
|
Shear Stress Stimulates Transcription of LOX-1 Gene
To examine whether shear stressinduced expression of LOX-1
depends on enhanced transcription of the LOX-1 gene, actinomycin D, an
inhibitor of de novo mRNA synthesis, was added to BAECs 30
minutes before the application of shear stress. Pretreatment with
actinomycin D completely abolished LOX-1 mRNA induction elicited by
shear stress (Figure 5
). These results
suggest that shear stress can stimulate transcription of the LOX-1
gene.
|
To obtain direct evidence that LOX-1 mRNA expression was regulated at
the transcriptional level, nuclear runoff assays were performed with
the use of nuclei isolated from BAECs stimulated with or without fluid
shear stress. Enhanced transcription of LOX-1 was observed in nuclear
extracts from shear stresstreated cells compared with those kept in a
static condition (Figure 6
).
Transcription of the GAPDH gene, in contrast, was not significantly
altered by fluid shear stress. Thus, these results demonstrate that
fluid shear stress stimulates transcription of the LOX-1 gene.
|
Intracellular Ca2+ Regulates Shear StressInduced
Expression of LOX-1
Fluid shear stress can rapidly elevate intracellular
Ca2+ levels; this Ca2+
elevation has been implicated in shear stressinduced gene expression,
such as induction of NO synthase7 and
heparin-binding epidermal growth factorlike growth
factor.12 To determine whether shear
stressmediated increases in intracellular Ca2+
were crucial for shear stressinduced LOX-1 expression, effects of
quin 2-AM, a chelator of intracellular Ca2+, were
examined. Pretreatment of BAECs with quin 2-AM (10 to 20 µmol/L)
for 2 hours completely inhibited shear stressinduced expression of
LOX-1 mRNA (Figure 7
).
|
We also tested whether Ca2+ mobilization alone is
sufficient for LOX-1 induction in BAECs. Ionomycin, a
Ca2+ ionophore, markedly induced LOX-1 mRNA in a
dose-dependent manner (Figure 8
). The
LOX-1 mRNA level in BAECs treated with 10 µmol/L of ionomycin
for 4 hours was 5.7 times higher than that in untreated BAECs. These
results indicate that shear stressinduced LOX-1 expression appears to
depend on intracellular Ca2+ mobilization.
|
| Discussion |
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Inducible expression of LOX-1 by shear stress is demonstrated at both
the protein and the mRNA levels in BAECs (Figures 1
and 2
).
Furthermore, Northern blot analyses using actinomycin D, as
well as nuclear runoff assays, have revealed that shear stress can
stimulate transcription of the LOX-1 gene (Figures 5
and 6
). Induction
of LOX-1 by fluid shear stress was relatively transient; shear
stressinduced LOX-1 mRNA levels peaked at 4 hours and had decreased
by 50% after 12 hours compared with the peak level. LOX-1 protein
levels peaked at 8 hours and were reduced by 30% after 12 hours. These
time courses of LOX-1 expression induced by shear stress are different
from those observed with tumor necrosis factor-
, which induced
sustained levels of LOX-1 expression (data not shown), suggesting that
distinct signal transduction pathways and transcriptional regulatory
mechanisms are involved.
Our studies involving the transient application of shear stress in
BAECs (Figure 3
) show that initial stimulation with shear stress is
sufficient for induced expression of LOX-1 and that sustained
application of shear stress is not necessarily required. This appears
to suggest that early signal transduction events elicited by shear
stress may play a crucial role in LOX-1 induction. Therefore, we have
focused on early events in signal transduction pathways
activated by shear stress. Previous publications have shown
that shear stress can stimulate phosphatidylinositol turnover,
generating inositol 1,4,5-trisphosphate and
1,2-diacylglycerol23 in cultured vascular
endothelial cells. Inositol 1,4,5-trisphosphate can
promote the rapid release of Ca2+ from
endoplasmic reticulum and, thereby, raise the cytosolic free
Ca2+ levels. Thus, the rapid increases in
intracellular Ca2+ levels elicited by shear
stress have been proposed as one of the earliest events in shear
stressinduced signal transduction pathways in
endothelial cells.20 21 22 As we
have shown in Figure 7
, induction of LOX-1 mRNA by shear stress was
completely inhibited by chelation of intracellular
Ca2+ with quin 2-AM. In addition, ionomycin,
which raises intracellular Ca2+ levels, by itself
increased LOX-1 mRNA levels (Figure 8
). Taken together, elevated levels
of intracellular Ca2+ were necessary and
sufficient for LOX-1 gene expression elicited by shear stress.
On the other hand, 1,2-diacylglycerol, an activator of protein kinase C (PKC), also appears to be responsible for a variety of cellular responses. In fact, shear stressinduced expression of certain genes, such as PDGF,10 heparin-binding epidermal growth factorlike growth factor,12 and c-fos,41 were shown to be mediated by PKC activation. Although both Ca2+ mobilization and PKC activation have been shown to be induced by fluid shear stress, our preliminary studies have shown that GF109203X, a specific inhibitor of PKC, failed to inhibit shear stressinduced LOX-1 expression (data not shown), suggesting that PKC may not play significant roles in shear stressinduced LOX-1 expression.
Fluid shear stress appears to stimulate transcription of the LOX-1
gene. Since cycloheximide did not inhibit shear stressinduced
expression of LOX-1 mRNA (Figure 4
), de novo synthesis of proteins,
such as transcription factors, is not required in this process. NF-
B
can be rapidly activated, without de novo protein synthesis, by
phosphorylation of inhibitor
B and the
subsequent dissociation from the p50/p65 complex, which are followed by
nuclear translocation of p50/p65. The NF-
B p50/p65 heterodimer has
been shown to bind to the shear stress responsive element
(SSRE) and thereby activates the SSRE-dependent gene
expression, such as PDGF-B chain, in response to shear
stress.33 42 In addition, a previous report has
also indicated that AP-1, as well as NF-
B, can be activated
by shear stress.31 33 Activation of AP-1 has been
shown to be responsible for shear stressinduced transcription of the
monocyte chemotactic protein-1 gene.32
Involvement of AP-1 and TPA responsive element are also
implicated in transcriptional downregulation of the vascular cell
adhesion molecule-1 gene.17 43 In transcriptional
regulation of PDGF-A chain by shear stress, interactions between
transcription factors Sp-1 and Egr-1 have also been
demonstrated.34 35 In the 5' flanking region of
the LOX-1 gene, both consensus NF-
Blike sequence and SSRE have
been identified (data not shown). Further studies are necessary to
elucidate the transcriptional regulatory mechanisms involved in shear
stressinduced LOX-1 gene expression.
In summary, the present study provides evidence, for the first time, that physiological levels of laminar fluid flow shear stress transcriptionally induce LOX-1 expression in BAECs by a mechanism dependent on intracellular Ca2+ mobilization. Endothelial expression of LOX-1, a novel receptor for Ox-LDL, may also be dynamically modulated, in vivo, in response to dynamic changes in blood flow. Although pathophysiological consequences of Ox-LDL uptake by vascular endothelium through LOX-1 remain to be fully clarified, modulated expression of this Ox-LDL receptor by fluid mechanical stimuli may play an important role in the localized formation of atherosclerotic lesions in vivo.
| Acknowledgments |
|---|
Received March 5, 1998; accepted June 16, 1998.
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K. Hayashida, N. Kume, T. Murase, M. Minami, D. Nakagawa, T. Inada, M. Tanaka, A. Ueda, G. Kominami, H. Kambara, et al. Serum Soluble Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1 Levels Are Elevated in Acute Coronary Syndrome: A Novel Marker for Early Diagnosis Circulation, August 9, 2005; 112(6): 812 - 818. [Abstract] [Full Text] [PDF] |
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H. Park, F. G. Adsit, and J. C. Boyington The 1.4 A Crystal Structure of the Human Oxidized Low Density Lipoprotein Receptor Lox-1 J. Biol. Chem., April 8, 2005; 280(14): 13593 - 13599. [Abstract] [Full Text] [PDF] |
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A. Md Sheikh, H. Ochi, A. Manabe, and J. Masuda Lysophosphatidylcholine posttranscriptionally inhibits interferon-{gamma}-induced IP-10, Mig and I-Tac expression in endothelial cells Cardiovasc Res, January 1, 2005; 65(1): 263 - 271. [Abstract] [Full Text] [PDF] |
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O. Hofnagel, B. Luechtenborg, K. Stolle, S. Lorkowski, H. Eschert, G. Plenz, and H. Robenek Proinflammatory Cytokines Regulate LOX-1 Expression in Vascular Smooth Muscle Cells Arterioscler. Thromb. Vasc. Biol., October 1, 2004; 24(10): 1789 - 1795. [Abstract] [Full Text] [PDF] |
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B. M. Singh and J. L. Mehta Interactions Between the Renin-Angiotensin System and Dyslipidemia: Relevance in the Therapy of Hypertension and Coronary Heart Disease Arch Intern Med, June 9, 2003; 163(11): 1296 - 1304. [Abstract] [Full Text] [PDF] |
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D. Li, L. Liu, H. Chen, T. Sawamura, and J. L. Mehta LOX-1, an Oxidized LDL Endothelial Receptor, Induces CD40/CD40L Signaling in Human Coronary Artery Endothelial Cells Arterioscler. Thromb. Vasc. Biol., May 1, 2003; 23(5): 816 - 821. [Abstract] [Full Text] [PDF] |
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D. Li, V. Williams, L. Liu, H. Chen, T. Sawamura, F. Romeo, and J. L. Mehta Expression of lectin-like oxidized low-density lipoprotein receptors during ischemia-reperfusion and its role in determination of apoptosis and left ventricular dysfunction J. Am. Coll. Cardiol., March 19, 2003; 41(6): 1048 - 1055. [Abstract] [Full Text] [PDF] |
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L. Cominacini, A. Fratta Pasini, U. Garbin, A. Pastorino, A. Rigoni, C. Nava, A. Davoli, V. Lo Cascio, and T. Sawamura The platelet-endothelium interaction mediated by lectin-like oxidized low-density lipoprotein receptor-1 reduces the intracellular concentration of nitric oxide in endothelial cells J. Am. Coll. Cardiol., February 5, 2003; 41(3): 499 - 507. [Abstract] [Full Text] [PDF] |
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D. Li, L. Liu, H. Chen, T. Sawamura, S. Ranganathan, and J. L. Mehta LOX-1 Mediates Oxidized Low-Density Lipoprotein-Induced Expression of Matrix Metalloproteinases in Human Coronary Artery Endothelial Cells Circulation, February 4, 2003; 107(4): 612 - 617. [Abstract] [Full Text] [PDF] |
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C. R. Kiefer, J. B. McKenney, J. F. Trainor, and L. M. Snyder Maturation-Dependent Acquired Coronary Structural Alterations and Atherogenesis in the Dahl Sodium-Sensitive Hypertensive Rat Circulation, November 5, 2002; 106(19): 2486 - 2490. [Abstract] [Full Text] [PDF] |
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D. Li, V. Williams, L. Liu, H. Chen, T. Sawamura, T. Antakli, and J. L. Mehta LOX-1 inhibition in myocardial ischemia-reperfusion injury: modulation of MMP-1 and inflammation Am J Physiol Heart Circ Physiol, November 1, 2002; 283(5): H1795 - H1801. [Abstract] [Full Text] [PDF] |
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D. Y. Li, H. J. Chen, E. D. Staples, K. Ozaki, B. Annex, B. K. Singh, R. Vermani, and J. L. Mehtat Oxidized Low-Density Lipoprotein Receptor LOX-1 and Apoptosis in Human Atherosclerotic Lesions Journal of Cardiovascular Pharmacology and Therapeutics, September 1, 2002; 7(3): 147 - 153. [Abstract] [PDF] |
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D. Li, H. Chen, F. Romeo, T. Sawamura, T. Saldeen, and J. L. Mehta Statins Modulate Oxidized Low-Density Lipoprotein-Mediated Adhesion Molecule Expression in Human Coronary Artery Endothelial Cells: Role of LOX-1 J. Pharmacol. Exp. Ther., August 1, 2002; 302(2): 601 - 605. [Abstract] [Full Text] [PDF] |
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J. L. Mehta and D. Li Identification, regulation and function of a novel lectin-like oxidized low-density lipoprotein receptor J. Am. Coll. Cardiol., May 1, 2002; 39(9): 1429 - 1435. [Abstract] [Full Text] [PDF] |
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A. MERTENS and P. HOLVOET Oxidized LDL and HDL: antagonists in atherothrombosis FASEB J, October 1, 2001; 15(12): 2073 - 2084. [Abstract] [Full Text] [PDF] |
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D.Y Li, H.J Chen, and J.L Mehta Statins inhibit oxidized-LDL-mediated LOX-1 expression, uptake of oxidized-LDL and reduction in PKB phosphorylation Cardiovasc Res, October 1, 2001; 52(1): 130 - 135. [Abstract] [Full Text] [PDF] |
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H. Kataoka, N. Kume, S. Miyamoto, M. Minami, M. Morimoto, K. Hayashida, N. Hashimoto, and T. Kita Oxidized LDL Modulates Bax/Bcl-2 Through the Lectinlike Ox-LDL Receptor-1 in Vascular Smooth Muscle Cells Arterioscler. Thromb. Vasc. Biol., June 1, 2001; 21(6): 955 - 960. [Abstract] [Full Text] [PDF] |
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T. Shimaoka, N. Kume, M. Minami, K. Hayashida, T. Sawamura, T. Kita, and S. Yonehara LOX-1 Supports Adhesion of Gram-Positive and Gram-Negative Bacteria J. Immunol., April 15, 2001; 166(8): 5108 - 5114. [Abstract] [Full Text] [PDF] |
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J. L Mehta and Dayuan Li Facilitative interaction between angiotensin II and oxidised LDL in cultured human coronary artery endothelial cells Journal of Renin-Angiotensin-Aldosterone System, March 1, 2001; 2(1_suppl): S70 - S76. [Abstract] [PDF] |
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V. Terpstra, E. S. van Amersfoort, A. G. van Velzen, J. Kuiper, and T. J. C. van Berkel Hepatic and Extrahepatic Scavenger Receptors : Function in Relation to Disease Arterioscler. Thromb. Vasc. Biol., August 1, 2000; 20(8): 1860 - 1872. [Full Text] [PDF] |
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L. Cominacini, A. F. Pasini, U. Garbin, A. Davoli, M. L. Tosetti, M. Campagnola, A. Rigoni, A. M. Pastorino, V. Lo Cascio, and T. Sawamura Oxidized Low Density Lipoprotein (ox-LDL) Binding to ox-LDL Receptor-1 in Endothelial Cells Induces the Activation of NF-kappa B through an Increased Production of Intracellular Reactive Oxygen Species J. Biol. Chem., April 21, 2000; 275(17): 12633 - 12638. [Abstract] [Full Text] [PDF] |
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M. Chen, M. Kakutani, M. Minami, H. Kataoka, N. Kume, S. Narumiya, T. Kita, T. Masaki, and T. Sawamura Increased Expression of Lectinlike Oxidized Low Density Lipoprotein Receptor-1 in Initial Atherosclerotic Lesions of Watanabe Heritable Hyperlipidemic Rabbits Arterioscler. Thromb. Vasc. Biol., April 1, 2000; 20(4): 1107 - 1115. [Abstract] [Full Text] [PDF] |
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T. Murase, N. Kume, H. Kataoka, M. Minami, T. Sawamura, T. Masaki, and T. Kita Identification of Soluble Forms of Lectin-Like Oxidized LDL Receptor-1 Arterioscler. Thromb. Vasc. Biol., March 1, 2000; 20(3): 715 - 720. [Abstract] [Full Text] [PDF] |
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H. Kataoka, N. Kume, S. Miyamoto, M. Minami, T. Murase, T. Sawamura, T. Masaki, N. Hashimoto, and T. Kita Biosynthesis and Post-translational Processing of Lectin-like Oxidized Low Density Lipoprotein Receptor-1 (LOX-1). N-LINKED GLYCOSYLATION AFFECTS CELL-SURFACE EXPRESSION AND LIGAND BINDING J. Biol. Chem., February 25, 2000; 275(9): 6573 - 6579. [Abstract] [Full Text] [PDF] |
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M. Okuda, M. Takahashi, J. Suero, C. E. Murry, O. Traub, H. Kawakatsu, and B. C. Berk Shear Stress Stimulation of p130cas Tyrosine Phosphorylation Requires Calcium-dependent c-Src Activation J. Biol. Chem., September 17, 1999; 274(38): 26803 - 26809. [Abstract] [Full Text] [PDF] |
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A. M Dart and J. P.F Chin-Dusting Lipids and the endothelium Cardiovasc Res, August 1, 1999; 43(2): 308 - 322. [Abstract] [Full Text] [PDF] |
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H. Kataoka, N. Kume, S. Miyamoto, M. Minami, H. Moriwaki, T. Murase, T. Sawamura, T. Masaki, N. Hashimoto, and T. Kita Expression of Lectinlike Oxidized Low-Density Lipoprotein Receptor-1 in Human Atherosclerotic Lesions Circulation, June 22, 1999; 99(24): 3110 - 3117. [Abstract] [Full Text] [PDF] |
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D. Y. Li, Y. C. Zhang, M. I. Philips, T. Sawamura, and J. L. Mehta Upregulation of Endothelial Receptor for Oxidized Low-Density Lipoprotein (LOX-1) in Cultured Human Coronary Artery Endothelial Cells by Angiotensin II Type 1 Receptor Activation Circ. Res., May 14, 1999; 84(9): 1043 - 1049. [Abstract] [Full Text] [PDF] |
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T. Kita LOX-1, a Possible Clue to the Missing Link Between Hypertension and Atherogenesis Circ. Res., May 14, 1999; 84(9): 1113 - 1115. [Full Text] [PDF] |
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L. Cominacini, A. Rigoni, A. F. Pasini, U. Garbin, A. Davoli, M. Campagnola, A. M. Pastorino, V. Lo Cascio, and T. Sawamura The Binding of Oxidized Low Density Lipoprotein (ox-LDL) to ox-LDL Receptor-1 Reduces the Intracellular Concentration of Nitric Oxide in Endothelial Cells through an Increased Production of Superoxide J. Biol. Chem., April 20, 2001; 276(17): 13750 - 13755. [Abstract] [Full Text] [PDF] |
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