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Metschl S, Bruder L, Paloschi V, Jakob K, Reutersberg B, Reeps C, Maegdefessel L, Gee M, Eckstein HH, Pelisek J. Changes in endocan and dermatan sulfate are associated with biomechanical properties of abdominal aortic wall during aneurysm expansion and rupture. Thromb Haemost 2022; 122:1513-1523. [PMID: 35170008 DOI: 10.1055/a-1772-0574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND AIMS The study aimed to assess the potential of proteoglycans (PG) and collagens as serological biomarkers in the abdominal aortic aneurysm (AAA). Furthermore, we investigated the underlying mechano-biological interactions and signaling pathways. METHODS Tissue and serum samples from patients with ruptured AAA (rAAA, n=29), elective AAA (eAAA, n=78), and healthy individuals (n=8) were evaluated by histology, immunohistochemistry and Enzyme-linked Immunosorbent Assay (ELISA), mechanical properties were assessed by tensile tests. Regulatory pathways were determined by membrane-based sandwich immunoassay. RESULTS In AAA samples, collagen type I and III (Col1, Col3), chondroitin sulfate (CS), and dermatan sulfate (DS) were significantly increased compared to controls (3.0-, 3.2-, 1.3-, and 53-fold; p<0.01). Col1 and endocan were also elevated in the serum of AAA patients (3.6- and 6.0-fold; p<0.01), while DS was significantly decreased (2.5-fold; p<0.01). Histological scoring showed increased total PGs and focal accumulation in rAAA compared to eAAA. Tissue β-stiffness was higher in rAAA compared to eAAA (2.0-fold, p=0.02). Serum Col1 correlated with maximum tensile force and failure tension (r=0.448 and 0.333; p<0.01 and =0.02), tissue endocan correlated with α-stiffness (r=0.340; p<0.01). Signaling pathways in AAA were associated with ECM synthesis and VSMC proliferation. In particular, Src family kinases, PDGF- and EGF-related proteins seem to be involved. CONCLUSIONS Our findings reveal a structural association between collagen and PGs and their response to changes in mechanical loads in AAA. Particularly Col1 and endocan reflect the mechano-biological conditions of the aortic wall also in the patient's serum and might serve for AAA risk stratification.
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Affiliation(s)
- Susanne Metschl
- Vascular and Endovascular Surgery, Technical University of Munich School of Medicine, Munchen, Germany
| | - Lukas Bruder
- Mechanics & High Performance Computing Group, Technical University of Munich, Munchen, Germany
| | - Valentina Paloschi
- Vascular and Endovascular surgery, Klinikum rechts der Isar der Technischen Universitat Munchen, Munchen, Germany
| | - Katharina Jakob
- Vascular and Endovascular Surgery, Technical University of Munich School of Medicine, Munchen, Germany
| | | | - Christian Reeps
- Visceral, Thoracic, and Vascular Surgery, Medizinische Fakultät an der TU-Dresden, Dresden, Germany
| | - Lars Maegdefessel
- Department for Vascular and Endovascular Surgery, Klinikum rechts der Isar der Technischen Universitat Munchen, Munchen, Germany
| | - Michael Gee
- Mechanics & High Performance Computing Group, Technical University of Munich, Munchen, Germany
| | - Hans-Henning Eckstein
- Vascular and Endovascular Surgery, Technical University of Munich School of Medicine, Munchen, Germany
| | - Jaroslav Pelisek
- Experimental Vascular Surgery, University of Zurich, Zurich, Switzerland
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Yanagisawa H, Yokoyama U. Extracellular matrix-mediated remodeling and mechanotransduction in large vessels during development and disease. Cell Signal 2021; 86:110104. [PMID: 34339854 DOI: 10.1016/j.cellsig.2021.110104] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/27/2021] [Accepted: 07/28/2021] [Indexed: 01/08/2023]
Abstract
The vascular extracellular matrix (ECM) is synthesized and secreted during embryogenesis and facilitates the growth and remodeling of large vessels. Proper interactions between the ECM and vascular cells are pivotal for building the vasculature required for postnatal dynamic circulation. The ECM serves as a structural component by maintaining the integrity of the vessel wall while also regulating intercellular signaling, which involves cytokines and growth factors. The major ECM component in large vessels is elastic fibers, which include elastin and microfibrils. Elastin is predominantly synthesized by vascular smooth muscle cells (SMCs) and uses microfibrils as a scaffold to lay down and assemble cross-linked elastin. The absence of elastin causes developmental defects that result in the subendothelial proliferation of SMCs and inward remodeling of the vessel wall. Notably, elastic fiber formation is attenuated in the ductus arteriosus and umbilical arteries. These two vessels function during embryogenesis and close after birth via cellular proliferation, migration, and matrix accumulation. In dynamic postnatal mechano-environments, the elastic fibers in large vessels also serve an essential role in proper signal transduction as a component of elastin-contractile units. Disrupted mechanotransduction in SMCs leads to pathological conditions such as aortic aneurysms that exhibit outward remodeling. This review discusses the importance of the ECM-mainly the elastic fiber matrix-in large vessels during developmental remodeling and under pathological conditions. By dissecting the role of the ECM in large vessels, we aim to provide insights into the role of ECM-mediated signal transduction that can provide a basis for seeking new targets for intervention in vascular diseases.
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Affiliation(s)
- Hiromi Yanagisawa
- Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance, The University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8577, Japan.
| | - Utako Yokoyama
- Department of Physiology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan.
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Sugiyama A, Yokota H, Misawa S, Mukai H, Sekiguchi Y, Koide K, Suichi T, Matsushima J, Kishimoto T, Tanei ZI, Saito Y, Ito S, Kuwabara S. Cerebral large artery stenosis and occlusion in POEMS syndrome. BMC Neurol 2021; 21:239. [PMID: 34167480 PMCID: PMC8223276 DOI: 10.1186/s12883-021-02260-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Accepted: 05/25/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This study aimed to investigate the frequency and risk factors for cerebral artery stenosis and occlusion in patients with polyneuropathy, organomegaly, endocrinopathy, M-protein, and skin changes (POEMS) syndrome. METHODS We reviewed results of magnetic resonance angiography (MRA) or computed tomography angiography (CTA) in 61 patients with POEMS syndrome seen between 2010 and 2017. Stenosis or occlusion was assessed in the initial MRA/CTA. Multivariate analysis was used to identify risk factors for artery stenosis/occlusion. In an autopsy case, pathologic examination was conducted of the occluded middle cerebral arteries. RESULTS Stenosis (> 50 %) or occlusion of the major cerebral arteries was found in 29 (47.5 %) patients on the initial MRA/CTA. The internal carotid artery was involved most frequently (32.8 %), followed by the anterior (21.3 %) and middle (16.4 %) cerebral arteries. The basilar (1.3 %) and vertebral (3.6 %) arteries were rarely affected. Cerebral infarction developed in eight (13.1 %) patients. The serum vascular endothelial growth factor (VEGF) level was an independent predictor for stenosis/occlusion (odds ratio, 1.228; 95 % confidence interval, 1.042-1.447; P = 0.014). An autopsy study showed occluded middle cerebral arteries by fibrous and myxomatous thickening of intima with splitting of the internal elastic lamina. Follow-up MRA in 23 patients showed improved, worsened, and unchanged stenosis in 20.7 %, 8.7 %, and 69.6 %, respectively. CONCLUSIONS Cerebral large-vessel stenosis or occlusion is frequently seen in approximately half of patients with POEMS syndrome. Vasculopathy was related to serum VEGF levels and thereby disease activity. Assessment of cerebral vessels is recommended in these patients to improve management.
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Affiliation(s)
- Atsuhiko Sugiyama
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan.
| | - Hajime Yokota
- Department of Diagnostic Radiology and Radiation Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Sonoko Misawa
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan
| | - Hiroki Mukai
- Department of Radiology, Chiba University Hospital, Chiba, Japan
| | - Yukari Sekiguchi
- Department of Neurology, JR Tokyo General Hospital, Tokyo, Japan
| | - Kyosuke Koide
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan
| | - Tomoki Suichi
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan
| | - Jun Matsushima
- Department of Pathology, Saitama Medical Center, Dokkyo Medical University, Saitama, Japan
- Department of Diagnostic pathology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Takashi Kishimoto
- Department of Molecular Pathology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Zen-Ichi Tanei
- Department of Pathology and Laboratory Medicine, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yuko Saito
- Department of Pathology and Laboratory Medicine, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Shoichi Ito
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan
- Department of Medical Education, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Satoshi Kuwabara
- Department of Neurology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, 260-8677, Chiba, Japan
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Sekiguchi T, Ishibashi S, Sasame J, Mukae JI, Noda K, Tanaka H, Yamamoto K, Takemoto Y, Kumagai J, Yokota T. Recurrent stroke due to quasi-moyamoya disease associated with POEMS syndrome: An autopsy case. J Neurol Sci 2020; 412:116738. [PMID: 32092484 DOI: 10.1016/j.jns.2020.116738] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/13/2020] [Accepted: 02/14/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Teruhiko Sekiguchi
- Department of Neurology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Satoru Ishibashi
- Department of Neurology and Neurological Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
| | - Jo Sasame
- Department of Neurosurgery, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Jun-Ichi Mukae
- Department of Hematology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan
| | - Kotaro Noda
- Department of Neurology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan
| | - Hiroaki Tanaka
- Department of Neurology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Koh Yamamoto
- Department of Hematology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Yasunori Takemoto
- Department of Neurosurgery, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Jiro Kumagai
- Department of Pathology, Yokohama City Minato Red Cross Hospital, 3-12-1 Shin-Yamashita, Naka-ku, Yokohama, Japan.
| | - Takanori Yokota
- Department of Neurology and Neurological Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
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Farrell K, Simmers P, Mahajan G, Boytard L, Camardo A, Joshi J, Ramamurthi A, Pinet F, Kothapalli CR. Alterations in phenotype and gene expression of adult human aneurysmal smooth muscle cells by exogenous nitric oxide. Exp Cell Res 2019; 384:111589. [PMID: 31473210 DOI: 10.1016/j.yexcr.2019.111589] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 08/24/2019] [Accepted: 08/29/2019] [Indexed: 12/25/2022]
Abstract
Abdominal aortic aneurysms (AAA) are characterized by matrix remodeling, elastin degradation, absence of nitric oxide (NO) signaling, and inflammation, influencing smooth muscle cell (SMC) phenotype and gene expression. Little is known about the biomolecular release and intrinsic biomechanics of human AAA-SMCs. NO delivery could be an attractive therapeutic strategy to restore lost functionality of AAA-SMCs by inhibiting inflammation and cell stiffening. We aim to establish the differences in phenotype and gene expression of adult human AAA-SMCs from healthy SMCs. Based on our previous study which showed benefits of optimal NO dosage delivered via S-Nitrosoglutathione (GSNO) to healthy aortic SMCs, we tested whether such benefits would occur in AAA-SMCs. The mRNA expression of three genes involved in matrix degradation (ACE, ADAMTS5 and ADAMTS8) was significantly downregulated in AAA-SMCs. Total protein and glycosaminoglycans synthesis were higher in AAA-SMCs than healthy-SMCs (p < 0.05 for AAA-vs. healthy- SMC cultures) and was enhanced by GSNO and 3D cultures (p < 0.05 for 3D vs. 2D cultures; p < 0.05 for GSNO vs. non-GSNO cases). Elastin gene expression, synthesis and deposition, desmosine crosslinker levels, and lysyl oxidase (LOX) functional activity were lower, while cell proliferation, iNOS, LOX and fibrillin-1 gene expressions were higher in AAA-SMCs (p < 0.05 between respective cases), with differential benefits from GSNO exposure. GSNO and 3D cultures reduced MMPs -2, -9, and increased TIMP-1 release in AAA-SMC cultures (p < 0.05 for GSNO vs. non-GSNO cultures). AAA-SMCs were inherently stiffer and had smoother surface than healthy SMCs (p < 0.01 in both cases), but GSNO reduced stiffness (~25%; p < 0.01) and increased roughness (p < 0.05) of both cell types. In conclusion, exogenously-delivered NO offers an attractive strategy by providing therapeutic benefits to AAA-SMCs.
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Affiliation(s)
- Kurt Farrell
- Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH, 44141, USA
| | - Phillip Simmers
- Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH, 44141, USA
| | - Gautam Mahajan
- Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH, 44141, USA
| | - Ludovic Boytard
- University of Lille, Inserm U1167, Institut Pasteur de Lille, France
| | - Andrew Camardo
- Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH, 44141, USA
| | - Jyotsna Joshi
- Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH, 44141, USA
| | - Anand Ramamurthi
- Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH, 44141, USA
| | - Florence Pinet
- University of Lille, Inserm U1167, Institut Pasteur de Lille, France
| | - Chandrasekhar R Kothapalli
- Department of Chemical and Biomedical Engineering, Cleveland State University, Cleveland, OH, 44141, USA.
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Lutter S, Xie S, Tatin F, Makinen T. Smooth muscle-endothelial cell communication activates Reelin signaling and regulates lymphatic vessel formation. ACTA ACUST UNITED AC 2012; 197:837-49. [PMID: 22665518 PMCID: PMC3373399 DOI: 10.1083/jcb.201110132] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Active lymph transport relies on smooth muscle cell (SMC) contractions around collecting lymphatic vessels, yet regulation of lymphatic vessel wall assembly and lymphatic pumping are poorly understood. Here, we identify Reelin, an extracellular matrix glycoprotein previously implicated in central nervous system development, as an important regulator of lymphatic vascular development. Reelin-deficient mice showed abnormal collecting lymphatic vessels, characterized by a reduced number of SMCs, abnormal expression of lymphatic capillary marker lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1), and impaired function. Furthermore, we show that SMC recruitment to lymphatic vessels stimulated release and proteolytic processing of endothelium-derived Reelin. Lymphatic endothelial cells in turn responded to Reelin by up-regulating monocyte chemotactic protein 1 (MCP1) expression, which suggests an autocrine mechanism for Reelin-mediated control of endothelial factor expression upstream of SMC recruitment. These results uncover a mechanism by which Reelin signaling is activated by communication between the two cell types of the collecting lymphatic vessels--smooth muscle and endothelial cells--and highlight a hitherto unrecognized and important function for SMCs in lymphatic vessel morphogenesis and function.
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Affiliation(s)
- Sophie Lutter
- Lymphatic Development Laboratory, Cancer Research UK London Research Institute, London WC2A 3LY, England, UK
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Lavigne D, Guerrier L, Gueguen V, Michel JB, Boschetti E, Meilhac O, Letourneur D. Culture of human cells and synthesis of extracellular matrix on materials compatible with direct analysis by mass spectrometry. Analyst 2010; 135:503-11. [PMID: 20174702 DOI: 10.1039/b914539g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extracellular matrix (ECM) is a complex three-dimensional network of macromolecules synthesized by cells and is essential for the structure and the function of a tissue. The aim of our approach was to propose a surface allowing cell culture and subsequent analysis of ECM produced by cells directly on materials compatible with Surface Enhanced Laser Desorption Ionization-Time Of Flight (SELDI-TOF) mass spectrometry on a 96-well format. Surfaces were made of aluminium and spots of 2 mm in diameter were covered with specific chemical groups (silica, C(6) and C(12) alkyl groups, carboxyl, quaternary amine, or nitrilotriacetic acid groups). We found that among the chemically modified aluminium spots, only silica groups allowed the culture of human vascular cells. The wettability was an essential parameter for cell culture on the surfaces. Indeed, cells could only be cultured on surfaces presenting a moderate wettability with water contact angles of ca. 60 degrees. Then, by treatment of confluent cells with detergents (Triton X100 and deoxycholate), we were able to obtain ECM on the surfaces that were subsequently analyzed using a mass spectrometer, which is currently impossible with any type of cell culture system. As an example, the analysis of ECM from human vascular smooth muscle cells (hVSMCs) and human umbilical vein endothelial cells (HUVECs) appeared to be reproducible and evidenced different ECM patterns from the two cell types. Applications based on these materials can be proposed for biomarker discovery or characterization of cells for biomedical/diagnostic purposes.
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Affiliation(s)
- Damien Lavigne
- Inserm U698, Cardiovascular Bio-engineering, X. Bichat Hospital, University Paris 7, Paris, F-75018, France
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Oörni K, Kovanen PT. Lipoprotein modification by secretory phospholipase A(2) enzymes contributes to the initiation and progression of atherosclerosis. Curr Opin Lipidol 2009; 20:421-7. [PMID: 19593123 DOI: 10.1097/mol.0b013e32832fa14d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE OF REVIEW Secretory phospholipase A2s (sPLA2s) are considered to be important enzymes in the initiation and progression of atherosclerosis. In this review, we discuss the various mechanisms by which the direct action of the sPLA2s on LDL particles in the arterial intima may contribute to atherogenesis. RECENT FINDINGS A wealth of evidence, both in vitro and in vivo, supports a role for the sPLA2s in atherogenesis. Very recently, systemic inhibition of sPLA2s was found to reduce measures of arterial inflammation. The mechanisms behind this inhibition, however, are largely unknown. Here, we discuss the consequences of sPLA2 action on LDL in the arterial intima and address the recent findings regarding the effects of the lipolytic products of sPLA2, lysophosphatidylcholine, and fatty acids on intimal cells. LDL modified by sPLA2 can accumulate in the arterial intima both extracellularly and intracellularly. Importantly, the lipolytic products promote atherosclerosis by monocyte/macrophage recruitment, by enhancing the production of proretentive molecules by vascular smooth muscle cells, and by inducing cell death. SUMMARY Recent findings on sPLA2s support the idea that the enzymes contribute to human atherogenesis not only as initiating agents but also in maintaining plaque inflammation.
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9
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Ikonomidis JS, Hendrick JW, Parkhurst AM, Herron AR, Escobar PG, Dowdy KB, Stroud RE, Hapke E, Zile MR, Spinale FG. Accelerated LV remodeling after myocardial infarction in TIMP-1-deficient mice: effects of exogenous MMP inhibition. Am J Physiol Heart Circ Physiol 2005; 288:H149-58. [PMID: 15598866 DOI: 10.1152/ajpheart.00370.2004] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Alterations in matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs) have been implicated in adverse left ventricular (LV) remodeling after myocardial infarction (MI). However, the direct mechanistic role of TIMPs in the post-MI remodeling process has not been completely established. The goal of this project was to define the effects of altering endogenous MMP inhibitory control through combined genetic and pharmacological approaches on post-MI remodeling in mice. This study examined the effects of MMP inhibition (MMPi) with PD-166793 (30 mg.kg(-1).day(-1)) on LV geometry and function (conductance volumetry) after MI in wild-type (WT) mice and mice deficient in the TIMP-1 gene [TIMP-1 knockout (TIMP1-KO)]. At 3 days after MI (coronary ligation), mice were randomized into four groups: WT-MI/MMPi (n = 10), TIMP1-KO-MI/MMPi (n = 10), WT-MI (n = 22), and TIMP1-KO-MI (n = 23). LV end-diastolic volume (EDV) and ejection fraction were determined 14 days after MI. Age-matched WT (n = 20) and TIMP1-KO (n = 28) mice served as reference controls. LVEDV was similar under control conditions in WT and TIMP1-KO mice (36 +/- 2 and 40 +/- 2 microl, respectively) but was greater in TIMP1-KO-MI than in WT-MI mice (48 +/- 2 vs. 61 +/- 5 microl, P < 0.05). LVEDV was reduced from MI-only values in WT-MI/MMPi and TIMP1-KO-MI/MMPi mice (42 +/- 2 and 36 +/- 2 microl, respectively, P < 0.05) but was reduced to the greatest degree in TIMP1-KO mice (P < 0.05). LV ejection fraction was reduced in both groups after MI and increased in TIMP1-KO-MI/MMPi, but not in WT-MI/MMPi, mice. These unique results demonstrated that myocardial TIMP-1 plays a regulatory role in post-MI remodeling and that the accelerated myocardial remodeling induced by TIMP-1 gene deletion can be pharmacologically "rescued" by MMP inhibition. These results define the importance of local endogenous control of MMP activity with respect to regulating LV structure and function after MI.
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Affiliation(s)
- John S Ikonomidis
- Division of Cardiothoracic Surgery, Medical University of South Carolina, 114 Doughty St., Charleston, SC 29425, USA
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Frackowiak J, Potempska A, LeVine H, Haske T, Dickson D, Mazur-Kolecka B. Extracellular Deposits of Aβ Produced in Cultures of Alzheimer Disease Brain Vascular Smooth Muscle Cells. J Neuropathol Exp Neurol 2005; 64:82-90. [PMID: 15715088 DOI: 10.1093/jnen/64.1.82] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Alzheimer disease (AD) and Down syndrome (DS) brains contain deposits of amyloid-beta peptide that are located extracellularly in the neuropil and in blood vessels walls. A small fraction of brain Abeta is detected intracellularly in neurons, smooth muscle cells, and microglia. The roles of these extracellular and intracellular pools of Abeta in pathogenesis of AD-type dementia are controversial. Cell culture models of vascular amyloidosis-beta revealed intracellular, but not extracellular deposition of Abeta. Here we demonstrate for the first time, formation of extracellular deposits of Abeta in primary cultures of vascular smooth muscle cells isolated from AD cases with cerebrovascular amyloid angiopathy. Extracellular Abeta deposition required the use of cultures that produced high quantities of Abeta, which contained at least 50% of cells forming intracellular Abeta deposits, and providing extracellular matrix proteins. During 12 days of culture in this system, we observed accumulation of nonfibrillar, granular deposits in extracellular matrix, similar to early stages of vascular amyloidogenesis in vivo. This is a valuable system to study the effects of various potential amyloidogenic factors on formation of extracellular Abeta deposits.
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Affiliation(s)
- Janusz Frackowiak
- NYS Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314, USA.
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Vijayagopal P, Menon PV. Varied low density lipoprotein binding property of proteoglycans synthesized by vascular smooth muscle cells cultured on extracellular matrix. Atherosclerosis 2005; 178:75-82. [PMID: 15585203 DOI: 10.1016/j.atherosclerosis.2004.08.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2004] [Revised: 08/10/2004] [Accepted: 08/19/2004] [Indexed: 11/26/2022]
Abstract
Earlier we showed that the extracellular matrix (ECM) secreted by vascular cells modulated proteoglycan synthesis by vascular smooth muscle cells in culture and altered the proteoglycan characteristics. In this study, we tested the hypothesis that these ECM-mediated alterations increased the affinity of the proteoglycans for plasma low density lipoprotein (LDL). Newly synthesized proteoglycans were isolated from smooth muscle cells cultured on the ECMs secreted by vascular endothelial cells, smooth muscle cells, or THP-1 macrophages and their binding affinity for LDL determined. Proteoglycans from all cultures contained sub-fractions that bound LDL with low and high affinity. However, compared with the cells plated on the endothelial cell ECM, the cells plated on the smooth muscle cell ECM and macrophage ECM synthesized significantly more high affinity proteoglycans. Removal of collagen, elastin, and chondroitin sulfates from the smooth muscle cell ECM and chondroitin sulfates from the macrophage ECM increased the production of high affinity proteoglycans by 15-22%. However, neutralization of fibronectin from both ECMs decreased the high affinity proteoglycans by 20%. Removal of matrix-bound growth factors had no effect on the synthesis of high affinity proteoglycans. Compared with the low affinity proteoglycans, the high affinity proteoglycans were larger, more sulfated and contained higher proportions of chondritin sulfate, dermatan sulfate, and N-sulfated heparan sulfate chains. These results suggest that the ECM-mediated alterations in vascular smooth muscle cell proteoglycans may lead to increased deposition of LDL in the arterial wall.
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Affiliation(s)
- Parakat Vijayagopal
- Section of Cardiology, Department of Medicine, Louisiana State University Health Sciences Center, 533 Bolivar Street, New Orleans, LA 70112, USA.
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Abstract
PURPOSE OF REVIEW Considerable evidence suggests that the subendothelial retention of atherogenic lipoproteins is a key early step in atherogenesis. In humans and experimental animals, elevated levels of plasma lipoproteins are associated with increased atherosclerosis, and lipoproteins with higher affinity for arterial proteoglycans are more atherogenic. Here we discuss the molecular mechanisms underlying lipoprotein retention in the arterial wall and how this interaction can be modulated. RECENT FINDINGS Functional proteoglycan binding sites in lipoproteins containing apolipoprotein B have been identified and shown to have atherogenic potential in vivo. In addition to apolipoprotein B, novel bridging molecules, those that can interact with both proteoglycans and lipoproteins, have been identified that mediate the retention of atherogenic particles in the vessel wall. The interaction between lipoproteins and proteoglycans can be enhanced by the modification of lipoproteins in the circulation and in the arterial wall, by alterations in the subendothelium, and by changes in proteoglycan synthesis that result in a more atherogenic profile. The retention of atherogenic lipoproteins is a potential target for therapies to reverse atherosclerosis, and in-vitro studies have identified compounds that decrease the affinity of proteoglycans for lipoproteins. SUMMARY Considerable progress has been made in understanding the association between lipoproteins and cardiovascular disease. This review highlights the importance of the interaction between lipoproteins and the arterial matrix.
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Affiliation(s)
- Maria Gustafsson
- Wallenberg Laboratory for Cardiovascular Research and the Cardiovascular Institute, The Sahlgrenska Academy at Göteborg University, 413 45 Göteborg, Sweden.
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