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Volume 27, Issue 2; February 1, 2007
Editorials
Brief Reviews
Vascular Biology
Atherosclerosis and Lipoproteins
Thrombosis
Letters to the Editor
Corrections
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Editorials
The Failure of Torcetrapib: Was it the Molecule or the Mechanism?
Alan R. Tall, Laurent Yvan-Charvet, and Nan Wang
Arterioscler Thromb Vasc Biol. 2007;27:257-260, doi:10.1161/01.ATV.0000256728.60226.77.
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Emerging Thrombotic Effects of Drug Eluting Stents
Ninian N. Lang and David E. Newby
Arterioscler Thromb Vasc Biol. 2007;27:261-262, doi:10.1161/01.ATV.0000255308.41576.ae.
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CXCR4, a Key Modulator of Vascular Progenitor Cells
Julie Sainz and Masataka Sata
Arterioscler Thromb Vasc Biol. 2007;27:263-265, doi:10.1161/01.ATV.0000256727.34148.e2.
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Brief Reviews
Implications of Early Structural-Functional Changes in the Endothelium for Vascular Disease
Maya Simionescu
Arterioscler Thromb Vasc Biol. 2007;27:266-274; published online before print November 30 2006, doi:10.1161/01.ATV.0000253884.13901.e4.
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The initial key events in atherosclerosis are the dyslipidemia-induced subtle modulation of endothelial constitutive functions and the subendothelial progressive accumulation of modified and reassembled lipoproteins that trigger an inflammatory reaction manifested by the expression of endothelial cell adhesion molecules and intimal accrual of macrophages, smooth muscle cells, and inflammatory molecules.
Vascular Biology
Sphingosine-1-Phosphate Stimulates the Functional Capacity of Progenitor Cells by Activation of the CXCR
4
-Dependent Signaling Pathway via the S1P
3
Receptor
Dirk H. Walter, Ulrich Rochwalsky, Johannes Reinhold, Florian Seeger, Alexandra Aicher, Carmen Urbich, Ioakim Spyridopoulos, Jerold Chun, Volker Brinkmann, Petra Keul, Bodo Levkau, Andreas M. Zeiher, Stefanie Dimmeler, and Judith Haendeler
Arterioscler Thromb Vasc Biol. 2007;27:275-282; published online before print December 7 2006, doi:10.1161/01.ATV.0000254669.12675.70.
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Treatment of progenitor cells with sphingosine-1-phosphate (S1P), a bioactive lipid, improved blood flow recovery in ischemic hind limbs via the S1P3 receptor. Mechanistically, S1P induced phosphorylation of the CXCR4 receptor, the Src kinase, and JAK2. S1P failed to stimulate in vivo blood flow recovery of bone marrow-derived mononuclear cells from CXCR4+/- mice. The activation of the CXCR4 receptor is mediated via the S1P3 receptor because S1P did not induce Src phosphorylation in progenitor cells from S1P3-/- mice.
M-CSF Accelerates Neointimal Formation in the Early Phase After Vascular Injury in Mice: The Critical Role of the SDF-1CXCR4 System
Yuji Shiba, Masafumi Takahashi, Toru Yoshioka, Noriyuki Yajima, Hajime Morimoto, Atsushi Izawa, Hirohiko Ise, Kiyohiko Hatake, Kazuo Motoyoshi, and Uichi Ikeda
Arterioscler Thromb Vasc Biol. 2007;27:283-289; published online before print October 19 2006, doi:10.1161/01.ATV.0000250606.70669.14.
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We tested the effects of M-CSF on the recruitment of bone marrow-derived progenitor cells in neointimal formation after vascular injury in mice. The findings obtained from this study demonstrated that M-CSF accelerated neointimal formation in the early phase after vascular injury via the SDF-1-CXCR4 system.
Regulation of Thromboxane Receptor Trafficking Through the Prostacyclin Receptor in Vascular Smooth Muscle Cells: Role of Receptor Heterodimerization
Stephen J. Wilson, Jennifer K. Dowling, Lei Zhao, Erin Carnish, and Emer M. Smyth
Arterioscler Thromb Vasc Biol. 2007;27:290-296; published online before print November 16 2006, doi:10.1161/01.ATV.0000252667.53790.4e.
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Interaction of the G protein-coupled receptors for prostacyclin (IP) and thromboxane (TP) permits reciprocal regulation of receptor endocytosis via a trafficking pathway determined by the activated dimeric partner. This represents a further mechanism by which dimerization may effect the IP-TP counterbalance.
Mass-Spectrometric Identification of a Novel Angiotensin Peptide in Human Plasma
Vera Jankowski, Raymond Vanholder, Markus van der Giet, Markus Tölle, Sevil Karadogan, Johan Gobom, Jens Furkert, Alexander Oksche, Eberhard Krause, Thi Nguyet Anh Tran, Martin Tepel, Mirjam Schuchardt, Hartmut Schlüter, Annette Wiedon, Michael Beyermann, Michael Bader, Mihail Todiras, Walter Zidek, and Joachim Jankowski
Arterioscler Thromb Vasc Biol. 2007;27:297-302; published online before print November 30 2006, doi:10.1161/01.ATV.0000253889.09765.5f.
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In this study, a new angiotensin-peptide of human plasma is described, which is characterized as a strong AT2-receptor agonist.
Cerebrovascular Nitrosative Stress Mediates Neurovascular and Endothelial Dysfunction Induced by Angiotensin II
Helene Girouard, Laibaik Park, Josef Anrather, Ping Zhou, and Costantino Iadecola
Arterioscler Thromb Vasc Biol. 2007;27:303-309; published online before print November 30 2006, doi:10.1161/01.ATV.0000253885.41509.25.
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Angiotensin II attenuates the increase in cerebral blood flow produced by acetylcholine or whisker stimulation. We found that these effects require nitric oxide and nox2-derived radicals, and are prevented by peroxynitrite antagonists. The data point to the involvement of peroxynitrite in the cerebrovascular dysfunction induced by angiotensin II.
Adenovirus-Mediated Expression of Tissue Factor Pathway Inhibitor-2 Inhibits Endothelial Cell Migration and Angiogenesis
Lacramioara Ivanciu, Robert D. Gerard, Haiwang Tang, Florea Lupu, and Cristina Lupu
Arterioscler Thromb Vasc Biol. 2007;27:310-316; published online before print November 30 2006, doi:10.1161/01.ATV.0000254147.89321.cf.
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This study shows that overexpression of TFPI-2 is an effective strategy to suppress angiogenesis. The mechanism apparently involves inhibition by TFPI-2 of plasmin and/or MMPs, thus reducing cell migration, promoting extracellular matrix deposition, and inhibiting neovascularization. The present data raise the possibility that TFPI-2 is a negative regulator of physiological angiogenesis.
Key Role of the NO-Pathway and Matrix Metalloprotease-9 in High Blood Flow-Induced Remodeling of Rat Resistance Arteries
Odile Dumont, Laurent Loufrani, and Daniel Henrion
Arterioscler Thromb Vasc Biol. 2007;27:317-324; published online before print December 7 2006, doi:10.1161/01.ATV.0000254684.80662.44.
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Blood flow is altered in metabolic and ischemic diseases with dramatic consequences. A chronic increase in blood flow (shear stress) in mesenteric resistance arteries induced outward hypertrophic remodeling attributable to the sequential activation of eNOS and MMP9. Lowering blood flow induced a diameter reduction reflecting the loss of flow-dependent dilation.
A Causal Role for Endothelin-1 in the Vascular Adaptation to Skeletal Muscle Deconditioning in Spinal Cord injury
Dick H.J. Thijssen, Reinier Ellenkamp, Miriam Kooijman, Peter Pickkers, Gerard A. Rongen, Maria T.E. Hopman, and Paul Smits
Arterioscler Thromb Vasc Biol. 2007;27:325-331; published online before print November 22 2006, doi:10.1161/01.ATV.0000253502.83167.31.
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We examined the contribution of endothelin-1 to leg vascular tone in controls and in spinal cord injury (representing inactivity), before and after 6-weeks training. Endothelin-1 is responsible for the increased leg vascular tone in spinal cord injury. Interestingly, 6 weeks cycling training normalized leg vascular tone, partially mediated by the reduced contribution of endothelin-1.
Atherosclerosis and Lipoproteins
Vascular Endothelial Growth Factor Receptor 2 Plays a Role in the Activation of Aortic Endothelial Cells by Oxidized Phospholipids
Alejandro Zimman, Kevin P. Mouillesseaux, Thang Le, Nima M. Gharavi, Ann Ryvkin, Thomas G. Graeber, Tom T. Chen, Andrew D. Watson, and Judith A. Berliner
Arterioscler Thromb Vasc Biol. 2007;27:332-338; published online before print November 16 2006, doi:10.1161/01.ATV.0000252842.57585.df.
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We identified VEGFR2 as a regulator of the transcription of IL-8, LDL-R, and TF induced by Ox-PAPC in human aortic endothelial cells. The activation of VEGFR2 is rapid, sustained, and depends on the activation of c-Src kinase.
Apolipoprotein E3- and Nitric OxideDependent Modulation of Endothelial Cell Inflammatory Responses
Adam E. Mullick, Andrew F. Powers, Rama S. Kota, Sarada D. Tetali, Jason P. Eiserich, and John C. Rutledge
Arterioscler Thromb Vasc Biol. 2007;27:339-345; published online before print November 30 2006, doi:10.1161/01.ATV.0000253947.70438.99.
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Endothelial-specific effects of apolipoprotein E3 (apoE3), apoE4, and nitric oxide (NO) were assessed with functional and genomic assays of cell inflammation. Herein, we describe a potent antiinflammatory role of apoE3 that is related to modulation of NO. These results have mechanistic implications of the atheroprotective roles of apoE3 and NO.
Hemodynamic Shear Stresses in Mouse Aortas: Implications for Atherogenesis
Jin Suo, Dardo E. Ferrara, Dan Sorescu, Robert E. Guldberg, W. Robert Taylor, and Don P. Giddens
Arterioscler Thromb Vasc Biol. 2007;27:346-351; published online before print November 22 2006, doi:10.1161/01.ATV.0000253492.45717.46.
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We have demonstrated that wall shear stresses in the mouse aorta are much higher than in humans. Despite this difference in magnitude, the spatial distributions of atherogenic molecules in the mouse aorta are similar to plaque localization found in the human aorta.
Serum Amyloid P and Cardiovascular Disease in Older Men and Women: Results from the Cardiovascular Health Study
Nancy Swords Jenny, Alice M. Arnold, Lewis H. Kuller, Russell P. Tracy, and Bruce M. Psaty
Arterioscler Thromb Vasc Biol. 2007;27:352-358; published online before print November 30 2006, doi:10.1161/01.ATV.0000254150.97741.fe.
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Serum amyloid P (SAP) is a pentraxin similar to C-reactive protein. We examined the association of SAP with cardiovascular disease (CVD) in older adults. SAP was associated with inflammatory markers, CVD risk factors, measures of subclinical CVD, and incident angina and MI.
Triglyceride:High-Density Lipoprotein Cholesterol Effects in Healthy Subjects Administered a Peroxisome Proliferator Activated Receptor
Agonist
Dennis L. Sprecher, Christine Massien, Greg Pearce, Andrew N. Billin, Itay Perlstein, Timothy M. Willson, David G. Hassall, Nicolas Ancellin, Scott D. Patterson, David C. Lobe, and Tony G. Johnson
Arterioscler Thromb Vasc Biol. 2007;27:359-365; published online before print November 16 2006, doi:10.1161/01.ATV.0000252790.70572.0c.
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A specific PPAR{delta} agonist was administered to human volunteers for the first time, revealing a decline in serum TG, an improvement in TG-clearance post-fat feeding, and an elevation in HDLc compared with placebo. Consistent with these findings, in vitro PPAR{delta}-treated human skeletal muscle cells induced fatty acid oxidation, and upregulated ABCA1 expression.
Angiopoietin-Like Protein3 Regulates Plasma HDL Cholesterol Through Suppression of Endothelial Lipase
Mitsuru Shimamura, Morihiro Matsuda, Hiroaki Yasumo, Mitsuyo Okazaki, Kazunori Fujimoto, Keita Kono, Tetsuya Shimizugawa, Yosuke Ando, Ryuta Koishi, Takafumi Kohama, Naohiko Sakai, Kazuaki Kotani, Ryutaro Komuro, Tatsuo Ishida, Kenichi Hirata, Shizuya Yamashita, Hidehiko Furukawa, and Iichiro Shimomura
Arterioscler Thromb Vasc Biol. 2007;27:366-372; published online before print November 16 2006, doi:10.1161/01.ATV.0000252827.51626.89.
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Current studies investigated the potential involvement of angptl3, previously known as a plasma suppressor of lipoprotein lipase, in HDL metabolism and its effects on endothelial lipase (EL) activity. The results suggest that angptl3 should be involved in the regulation of plasma HDL levels through the inhibition of EL activity.
Ccr5 But Not Ccr1 Deficiency Reduces Development of Diet-Induced Atherosclerosis in Mice
Vincent Braunersreuther, Alma Zernecke, Claire Arnaud, Elisa A. Liehn, Sabine Steffens, Erdenechimeg Shagdarsuren, Kiril Bidzhekov, Fabienne Burger, Graziano Pelli, Bruno Luckow, François Mach, and Christian Weber
Arterioscler Thromb Vasc Biol. 2007;27:373-379; published online before print November 30 2006, doi:10.1161/01.ATV.0000253886.44609.ae.
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Although general blockade of CCL5 receptors reduces atherosclerosis, specific roles of CCR1 and CCR5 have not been unequivocally determined. Genetic deletion of Ccr5 but not Ccr1 in ApoE-/- mice protects from diet-induced atherosclerosis, resulting in a more stable plaque phenotype with reduced mononuclear cell infiltration and Th1-type immune responses.
Bone Marrow Transplantation Reveals That Recipient AT1a Receptors Are Required to Initiate Angiotensin IIInduced Atherosclerosis and Aneurysms
Lisa A. Cassis, Debra L. Rateri, Hong Lu, and Alan Daugherty
Arterioscler Thromb Vasc Biol. 2007;27:380-386; published online before print December 7 2006, doi:10.1161/01.ATV.0000254680.71485.92.
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AngII infusion into hyperlipidemic mice leads to augmentation of atherosclerosis and formation of AAAs. The absence of AT1a receptors ablated the development of both these pathologies. Bone marrow transplantation studies demonstrated that the AT1a receptor genotype of the recipient was required to initiate these vascular diseases.
In Vivo Plaque Characterization Using Intravascular UltrasoundVirtual Histology in a Porcine Model of Complex Coronary Lesions
Juan F. Granada, David Wallace-Bradley, Htut K. Win, Carlos L. Alviar, Angela Builes, Eli I. Lev, Roberto Barrios, Daryl G. Schulz, Albert E. Raizner, and Greg L. Kaluza
Arterioscler Thromb Vasc Biol. 2007;27:387-393; published online before print November 30 2006, doi:10.1161/01.ATV.0000253907.51681.0e.
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Coronary lesions were developed by adventitial injection of lipid-rich liposomes in porcine coronary arteries. IVUS-VH analysis was performed at 8.2{+/-}1.6 weeks after injection. Linear regression models showed that IVUS-VH was not accurate in detecting the relative amount of specific plaque components within each individual corresponding histological specimen.
Association Between A Leukotriene C
4
Synthase Gene Promoter Polymorphism and Coronary Artery Calcium in Young Women: The Muscatine Study
David M. Iovannisci, Edward J. Lammer, Lori Steiner, Suzanne Cheng, Larry T. Mahoney, Patricia H. Davis, Ronald M. Lauer, and Trudy L. Burns
Arterioscler Thromb Vasc Biol. 2007;27:394-399; published online before print November 16 2006, doi:10.1161/01.ATV.0000252680.72734.10.
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An age-adjusted increased risk for coronary artery calcium associated with the (-444)A>C promoter polymorphism of Leukotriene C4 Synthase (LTC4S) was identified in women (OR 4.29; 95% CI 1.78, 10.31). LTC4S is the rate limiting enzyme in the conversion of arachidonic acid to the proinflammatory cysteinyl-leukotrienes.
Thrombosis
Antiproliferative Agents Alter Vascular Plasminogen Activator Inhibitor-1 Expression: A Potential Prothrombotic Mechanism of Drug-Eluting Stents
James A.S. Muldowney, III, John R. Stringham, Shawn E. Levy, Linda A. Gleaves, Mesut Eren, Robert N. Piana, and Douglas E. Vaughan
Arterioscler Thromb Vasc Biol. 2007;27:400-406; published online before print December 7 2006, doi:10.1161/01.ATV.0000254677.12861.b8.
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To examine the prothrombotic effects of antiproliferative agents on endothelial gene expression, coronary endothelial cells were treated with paclitaxel or rapamycin. Transcriptional profiling was performed and confirmed by RT-PCR, ELISA, and a murine model. Rapamycin and paclitaxel induced increases in endothelial PAI-1 in the coronary arteries and aortas of mice.
Platelet Activity, Coagulation, and Fibrinolysis During Exercise in Healthy Males: Effects of Thrombin Inhibition by Argatroban and Enoxaparin
Nailin Li, Shu He, Margareta Blombäck, and Paul Hjemdahl
Arterioscler Thromb Vasc Biol. 2007;27:407-413; published online before print November 30 2006, doi:10.1161/01.ATV.0000253906.19648.ac.
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Studies of thrombin inhibition by argatroban or enoxaparin showed that strenuous exercise enhances platelet activation thrombin independently. Exercise augmented both coagulation and fibrinolysis, but appeared to maintain the balance between them. Argatroban or enoxaparin treatment had strong anticoagulant effects and enhanced fibrinolysis; argatroban inhibited thrombin-induced platelet activation most efficiently.
Lysophosphatidic Acid Induces Thrombogenic Activity Through Phosphatidylserine Exposure and Procoagulant Microvesicle Generation in Human Erythrocytes
Seung-Min Chung, Ok-Nam Bae, Kyung-Min Lim, Ji-Yoon Noh, Moo-Yeol Lee, Yi-Sook Jung, and Jin-Ho Chung
Arterioscler Thromb Vasc Biol. 2007;27:414-421; published online before print November 16 2006, doi:10.1161/01.ATV.0000252898.48084.6a.
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Although erythrocytes have been suggested to play a role in blood clotting, mediated through phosphatidylserine (PS) exposure and/or PS-bearing microvesicle generation, an endogenous substance that triggers the membrane alterations leading to a procoagulant activity in erythrocytes has not been reported. We now demonstrated that lysophosphatidic acid (LPA), an important lipid mediator in various pathophysiological processes, induces PS exposure and procoagulant microvesicle generation in erythrocytes, which represent a biological significance resulting in induction of thrombogenic activity.
GPVI Potentiation of Platelet Activation by Thrombin and Adhesion Molecules Independent of Src Kinases and Syk
Sascha C. Hughan, Craig E. Hughes, Owen J.T. McCarty, Edina Schweighoffer, Izoumroud Soultanova, Jerry Ware, Victor L.J. Tybulewicz, and Steve P. Watson
Arterioscler Thromb Vasc Biol. 2007;27:422-429; published online before print November 16 2006, doi:10.1161/01.ATV.0000252826.96134.21.
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We show a critical role for Syk in platelet spreading mediated by adhesion receptors that can be overcome by addition of G protein agonists. In addition, we demonstrate for the first time a synergistic pathway between GPVI and thrombin which promotes integrin {alpha}IIbß3 activation independent of Syk and Src kinases.
Cholesterol Enrichment of Human Monocyte/Macrophages Induces Surface Exposure of Phosphatidylserine and the Release of Biologically-Active Tissue FactorPositive Microvesicles
Ming-Lin Liu, Michael P. Reilly, Peter Casasanto, Steven E. McKenzie, and Kevin Jon Williams
Arterioscler Thromb Vasc Biol. 2007;27:430-435; published online before print December 7 2006, doi:10.1161/01.ATV.0000254674.47693.e8.
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Cellular cholesterol accumulation is an important feature of atherosclerosis. In the current study, we found that cholesterol enrichment of human monocytes and macrophages substantially induced the generation of biologically-active microvesicles, including a subset that is tissue factor-positive and highly procoagulant. We conclude that cholesterol-induced monocyte/macrophage microvesicles may be novel contributors to atherothrombosis.
Letters to the Editor
Letter to the Editor: Monocyte cAMP Content Is Decreased in Patients With Stable Angina
Marie Anne Punchard, Aranzazu Ortega Pozzi, Teresa Perez de Prada, Monica Torres Coronado, Pablo Gonzalez, and Panayotis Fantidis
Arterioscler Thromb Vasc Biol. 2007;27:436-437, doi:10.1161/01.ATV.0000252709.13329.7c.
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Corrections
Correction
Arterioscler Thromb Vasc Biol. 2007;27:e8.
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