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Colliec-Jouault S, Esposito F, Ledru H, Sinquin C, Marchand L, Fillaudeau A, Routier S, Buron F, Lopin-Bon C, Cuenot S, Bedini E, Zykwinska A. Glycosaminoglycan Mimetics Obtained by Microwave-Assisted Sulfation of Marine Bacterium Sourced Infernan Exopolysaccharide. Biomacromolecules 2023; 24:462-470. [PMID: 36563405 DOI: 10.1021/acs.biomac.2c01277] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Sulfated glycosaminoglycans (GAGs) are fundamental constituents of both the cell surface and extracellular matrix. By playing a key role in cell-cell and cell-matrix interactions, GAGs are involved in many physiological and pathological processes. To design GAG mimetics with similar therapeutic potential as the natural ones, the specific structural features, among them sulfate content, sulfation pattern, and chain length, should be considered. In the present study, we describe a sulfation method based on microwave radiation to obtain highly sulfated derivatives as GAG mimetics. The starting low-molecular-weight (LMW) derivative was prepared from the infernan exopolysaccharide, a highly branched naturally slightly sulfated heteropolysaccharide synthesized by the deep-sea hydrothermal vent bacterium Alteromonas infernus. LMW highly sulfated infernan derivatives obtained by conventional heating sulfation have already been shown to display GAG-mimetic properties. Here, the potential of microwave-assisted sulfation versus that of the conventional method to obtain GAG mimetics was explored. Structural analysis by NMR revealed that highly sulfated derivatives from the two methods shared similar structural features, emphasizing that microwave-assisted sulfation with a 12-fold shorter reaction time is as efficient as the classical one.
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Affiliation(s)
| | - Fabiana Esposito
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S.Angelo, via Cintia 4, I-80126Napoli, Italy
| | - Hélène Ledru
- Institut de Chimie Organique et Analytique─UMR 7311, Université d'Orléans et CNRS, Rue de Chartres, BP 6759, 45067Orléans Cedex 2, France
| | - Corinne Sinquin
- Ifremer, MASAE Microbiologie Aliment Santé Environnement, F-44000Nantes, France
| | - Laetitia Marchand
- Ifremer, MASAE Microbiologie Aliment Santé Environnement, F-44000Nantes, France
| | - Arnaud Fillaudeau
- Ifremer, MASAE Microbiologie Aliment Santé Environnement, F-44000Nantes, France
| | - Sylvain Routier
- Institut de Chimie Organique et Analytique─UMR 7311, Université d'Orléans et CNRS, Rue de Chartres, BP 6759, 45067Orléans Cedex 2, France
| | - Frédéric Buron
- Institut de Chimie Organique et Analytique─UMR 7311, Université d'Orléans et CNRS, Rue de Chartres, BP 6759, 45067Orléans Cedex 2, France
| | - Chrystel Lopin-Bon
- Institut de Chimie Organique et Analytique─UMR 7311, Université d'Orléans et CNRS, Rue de Chartres, BP 6759, 45067Orléans Cedex 2, France
| | - Stéphane Cuenot
- Institut des Matériaux Jean Rouxel─IMN, Nantes Université and CNRS, Nantes44322, France
| | - Emiliano Bedini
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S.Angelo, via Cintia 4, I-80126Napoli, Italy
| | - Agata Zykwinska
- Ifremer, MASAE Microbiologie Aliment Santé Environnement, F-44000Nantes, France
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Production, characteristics and applications of microbial heparinases. Biochimie 2022; 198:109-140. [DOI: 10.1016/j.biochi.2022.03.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/03/2022] [Accepted: 03/28/2022] [Indexed: 12/26/2022]
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Paiardi G, Richter S, Oreste P, Urbinati C, Rusnati M, Wade RC. The binding of heparin to spike glycoprotein inhibits SARS-CoV-2 infection by three mechanisms. J Biol Chem 2021; 298:101507. [PMID: 34929169 PMCID: PMC8683219 DOI: 10.1016/j.jbc.2021.101507] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 12/09/2021] [Accepted: 12/11/2021] [Indexed: 01/03/2023] Open
Abstract
Heparin, a naturally occurring glycosaminoglycan, has been found to have antiviral activity against SARS-CoV-2, the causative virus of COVID-19. To elucidate the mechanistic basis for the antiviral activity of heparin, we investigated the binding of heparin to the SARS-CoV-2 spike glycoprotein by means of sliding window docking, molecular dynamics simulations, and biochemical assays. Our simulations show that heparin binds at long, positively-charged patches on the spike glycoprotein, thereby masking basic residues of both the receptor binding domain (RBD) and the multifunctional S1/S2 site. Biochemical experiments corroborated the simulation results, showing that heparin inhibits the furin-mediated cleavage of spike by binding to the S1/S2 site. Our simulations also showed that heparin can act on the hinge region responsible for motion of the RBD between the inactive closed and active open conformations of the spike glycoprotein. In simulations of the closed spike homotrimer, heparin binds the RBD and the N-terminal domain of two adjacent spike subunits and hinders opening. In simulations of open spike conformations, heparin induces stabilization of the hinge region and a change in RBD motion. Taken together, our results indicate that heparin can inhibit SARS-CoV-2 infection by three mechanisms: by allosterically hindering binding to the host cell receptor, by directly competing with binding to host heparan sulfate proteoglycan co-receptors, and by preventing spike cleavage by furin. Furthermore, these simulations provide insights into how host heparan sulfate proteoglycans can facilitate viral infection. Our results will aid the rational optimization of heparin derivatives for SARS-CoV-2 antiviral therapy.
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Affiliation(s)
- Giulia Paiardi
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), 69118 Heidelberg, Germany; Macromolecular Interaction Analysis Unit, Section of Experimental Oncology and Immunology, Department of Molecular and Translational Medicine, 25123 Brescia, Italy.
| | - Stefan Richter
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), 69118 Heidelberg, Germany
| | | | - Chiara Urbinati
- Macromolecular Interaction Analysis Unit, Section of Experimental Oncology and Immunology, Department of Molecular and Translational Medicine, 25123 Brescia, Italy
| | - Marco Rusnati
- Macromolecular Interaction Analysis Unit, Section of Experimental Oncology and Immunology, Department of Molecular and Translational Medicine, 25123 Brescia, Italy
| | - Rebecca C Wade
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), 69118 Heidelberg, Germany; Zentrum für Molekulare Biologie (ZMBH), DKFZ-ZMBH Alliance and Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, 69120 Heidelberg, Germany.
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Ishihara M, Nakamura S, Sato Y, Takayama T, Fukuda K, Fujita M, Murakami K, Yokoe H. Heparinoid Complex-Based Heparin-Binding Cytokines and Cell Delivery Carriers. Molecules 2019; 24:molecules24244630. [PMID: 31861225 PMCID: PMC6943580 DOI: 10.3390/molecules24244630] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/10/2019] [Accepted: 12/11/2019] [Indexed: 12/20/2022] Open
Abstract
Heparinoid is the generic term that is used for heparin, heparan sulfate (HS), and heparin-like molecules of animal or plant origin and synthetic derivatives of sulfated polysaccharides. Various biological activities of heparin/HS are attributed to their specific interaction and regulation with various heparin-binding cytokines, antithrombin (AT), and extracellular matrix (ECM) biomolecules. Specific domains with distinct saccharide sequences in heparin/HS mediate these interactions are mediated and require different highly sulfated saccharide sequences with different combinations of sulfated groups. Multivalent and cluster effects of the specific sulfated sequences in heparinoids are also important factors that control their interactions and biological activities. This review provides an overview of heparinoid-based biomaterials that offer novel means of engineering of various heparin-binding cytokine-delivery systems for biomedical applications and it focuses on our original studies on non-anticoagulant heparin-carrying polystyrene (NAC-HCPS) and polyelectrolyte complex-nano/microparticles (N/MPs), in addition to heparin-coating devices.
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Affiliation(s)
- Masayuki Ishihara
- Division of Biomedical Engineering, Research Institute, National Defense Medical College, 3-2 Namiki, Tokorazawa, Saitama 359-8513, Japan; (S.N.); (Y.S.); (K.F.)
- Correspondence: ; Tel.: +81-429-95-1211 (ext. 2610)
| | - Shingo Nakamura
- Division of Biomedical Engineering, Research Institute, National Defense Medical College, 3-2 Namiki, Tokorazawa, Saitama 359-8513, Japan; (S.N.); (Y.S.); (K.F.)
| | - Yoko Sato
- Division of Biomedical Engineering, Research Institute, National Defense Medical College, 3-2 Namiki, Tokorazawa, Saitama 359-8513, Japan; (S.N.); (Y.S.); (K.F.)
| | - Tomohiro Takayama
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan; (T.T.); (K.M.); (H.Y.)
| | - Koichi Fukuda
- Division of Biomedical Engineering, Research Institute, National Defense Medical College, 3-2 Namiki, Tokorazawa, Saitama 359-8513, Japan; (S.N.); (Y.S.); (K.F.)
| | - Masanori Fujita
- Division of Environmental Medicine, Research Institute, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-1324, Japan;
| | - Kaoru Murakami
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan; (T.T.); (K.M.); (H.Y.)
| | - Hidetaka Yokoe
- Department of Oral and Maxillofacial Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama 359-8513, Japan; (T.T.); (K.M.); (H.Y.)
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Lanzi C, Cassinelli G. Heparan Sulfate Mimetics in Cancer Therapy: The Challenge to Define Structural Determinants and the Relevance of Targets for Optimal Activity. Molecules 2018; 23:E2915. [PMID: 30413079 PMCID: PMC6278363 DOI: 10.3390/molecules23112915] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/06/2018] [Accepted: 11/06/2018] [Indexed: 12/21/2022] Open
Abstract
Beyond anticoagulation, the therapeutic potential of heparin derivatives and heparan sulfate (HS) mimetics (functionally defined HS mimetics) in oncology is related to their ability to bind and modulate the function of a vast array of HS-binding proteins with pivotal roles in cancer growth and progression. The definition of structural/functional determinants and the introduction of chemical modifications enabled heparin derivatives to be identified with greatly reduced or absent anticoagulant activity, but conserved/enhanced anticancer activity. These studies paved the way for the disclosure of structural requirements for the inhibitory effects of HS mimetics on heparanase, selectins, and growth factor receptor signaling, as well as for the limitation of side effects. Actually, HS mimetics affect the tumor biological behavior via a multi-target mechanism of action based on their effects on tumor cells and various components of the tumor microenvironment. Emerging evidence indicates that immunomodulation can participate in the antitumor activity of these agents. Significant ability to enhance the antitumor effects of combination treatments with standard therapies was shown in several tumor models. While the first HS mimetics are undergoing early clinical evaluation, an improved understanding of the molecular contexts favoring the antitumor action in certain malignancies or subgroups is needed to fully exploit their potential.
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Affiliation(s)
- Cinzia Lanzi
- Molecular Pharmacology Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy.
| | - Giuliana Cassinelli
- Molecular Pharmacology Unit, Department of Applied Research and Technological Development, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy.
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Mulloy B, Hogwood J, Gray E, Lever R, Page CP. Pharmacology of Heparin and Related Drugs. Pharmacol Rev 2016; 68:76-141. [PMID: 26672027 DOI: 10.1124/pr.115.011247] [Citation(s) in RCA: 216] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Heparin has been recognized as a valuable anticoagulant and antithrombotic for several decades and is still widely used in clinical practice for a variety of indications. The anticoagulant activity of heparin is mainly attributable to the action of a specific pentasaccharide sequence that acts in concert with antithrombin, a plasma coagulation factor inhibitor. This observation has led to the development of synthetic heparin mimetics for clinical use. However, it is increasingly recognized that heparin has many other pharmacological properties, including but not limited to antiviral, anti-inflammatory, and antimetastatic actions. Many of these activities are independent of its anticoagulant activity, although the mechanisms of these other activities are currently less well defined. Nonetheless, heparin is being exploited for clinical uses beyond anticoagulation and developed for a wide range of clinical disorders. This article provides a "state of the art" review of our current understanding of the pharmacology of heparin and related drugs and an overview of the status of development of such drugs.
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Affiliation(s)
- Barbara Mulloy
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, King's College London, London, United Kingdom (B.M., C.P.P.); National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom (J.H., E.G.); and University College London School of Pharmacy, London, United Kingdom (R.L.)
| | - John Hogwood
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, King's College London, London, United Kingdom (B.M., C.P.P.); National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom (J.H., E.G.); and University College London School of Pharmacy, London, United Kingdom (R.L.)
| | - Elaine Gray
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, King's College London, London, United Kingdom (B.M., C.P.P.); National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom (J.H., E.G.); and University College London School of Pharmacy, London, United Kingdom (R.L.)
| | - Rebecca Lever
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, King's College London, London, United Kingdom (B.M., C.P.P.); National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom (J.H., E.G.); and University College London School of Pharmacy, London, United Kingdom (R.L.)
| | - Clive P Page
- Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science, King's College London, London, United Kingdom (B.M., C.P.P.); National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, United Kingdom (J.H., E.G.); and University College London School of Pharmacy, London, United Kingdom (R.L.)
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Préchoux A, Halimi C, Simorre JP, Lortat-Jacob H, Laguri C. C5-epimerase and 2-O-sulfotransferase associate in vitro to generate contiguous epimerized and 2-O-sulfated heparan sulfate domains. ACS Chem Biol 2015; 10:1064-71. [PMID: 25594747 DOI: 10.1021/cb501037a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Heparan sulfate (HS), a complex polysaccharide of the cell surface, is endowed with the remarkable ability to bind numerous proteins and, as such, regulates a large variety of biological processes. Protein binding depends on HS structure; however, in the absence of a template driving its biosynthesis, the mechanism by which protein binding sequences are assembled remains poorly known. Here, we developed a chemically defined 13C-labeled substrate and NMR based experiments to simultaneously follow in real time the activity of HS biosynthetic enzymes and characterize the reaction products. Using this new approach, we report that the association of C5-epimerase and 2-O-sulfotransferase, which catalyze the production of iduronic acid and its 2-O-sulfation, respectively, is necessary to processively generate extended sequences of contiguous IdoA2S-containing disaccharides, whereas modifications are randomly introduced when the enzymes are uncoupled. These data shed light on the mechanisms by which HS motifs are generated during biosynthesis. They support the view that HS structure assembly is controlled not only by the availability of the biosynthetic enzymes but also by their physical association, which in the case of the C5-epimerase and 2-O-sulfotransferase was characterized by an affinity of 80 nM as demonstrated by surface plasmon resonance experiments.
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Affiliation(s)
- Aurélie Préchoux
- Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38027 Grenoble, France
- CNRS, IBS, F-38027 Grenoble, France
- CEA, DSV, IBS, F-38027 Grenoble, France
| | - Célia Halimi
- Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38027 Grenoble, France
- CNRS, IBS, F-38027 Grenoble, France
- CEA, DSV, IBS, F-38027 Grenoble, France
| | - Jean-Pierre Simorre
- Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38027 Grenoble, France
- CNRS, IBS, F-38027 Grenoble, France
- CEA, DSV, IBS, F-38027 Grenoble, France
| | - Hugues Lortat-Jacob
- Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38027 Grenoble, France
- CNRS, IBS, F-38027 Grenoble, France
- CEA, DSV, IBS, F-38027 Grenoble, France
| | - Cédric Laguri
- Univ. Grenoble Alpes, Institut de Biologie Structurale (IBS), F-38027 Grenoble, France
- CNRS, IBS, F-38027 Grenoble, France
- CEA, DSV, IBS, F-38027 Grenoble, France
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Heparin/Heparan sulfate proteoglycans glycomic interactome in angiogenesis: biological implications and therapeutical use. Molecules 2015; 20:6342-88. [PMID: 25867824 PMCID: PMC6272510 DOI: 10.3390/molecules20046342] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 03/31/2015] [Accepted: 04/01/2015] [Indexed: 12/20/2022] Open
Abstract
Angiogenesis, the process of formation of new blood vessel from pre-existing ones, is involved in various intertwined pathological processes including virus infection, inflammation and oncogenesis, making it a promising target for the development of novel strategies for various interventions. To induce angiogenesis, angiogenic growth factors (AGFs) must interact with pro-angiogenic receptors to induce proliferation, protease production and migration of endothelial cells (ECs). The action of AGFs is counteracted by antiangiogenic modulators whose main mechanism of action is to bind (thus sequestering or masking) AGFs or their receptors. Many sugars, either free or associated to proteins, are involved in these interactions, thus exerting a tight regulation of the neovascularization process. Heparin and heparan sulfate proteoglycans undoubtedly play a pivotal role in this context since they bind to almost all the known AGFs, to several pro-angiogenic receptors and even to angiogenic inhibitors, originating an intricate network of interaction, the so called "angiogenesis glycomic interactome". The decoding of the angiogenesis glycomic interactome, achievable by a systematic study of the interactions occurring among angiogenic modulators and sugars, may help to design novel antiangiogenic therapies with implications in the cure of angiogenesis-dependent diseases.
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Casu B, Naggi A, Torri G. Re-visiting the structure of heparin. Carbohydr Res 2014; 403:60-8. [PMID: 25088334 DOI: 10.1016/j.carres.2014.06.023] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 06/22/2014] [Indexed: 01/12/2023]
Abstract
The sulfated polysaccharide heparin has been used as a life-saving anticoagulant in clinics well before its detailed structure was known. This mini-review is a survey of the evolution in the discovery of the primary and secondary structure of heparin. Highlights in this history include elucidation and synthesis of the specific sequence that binds to antithrombin, the development of low-molecular-weight heparins currently used as antithrombotic drugs, and the most promising start of chemo-enzymatic synthesis. Special emphasis is given to peculiar conformational properties contributing to interaction with proteins that modulate different biological properties.
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Affiliation(s)
- Benito Casu
- G. Ronzoni Institute for Chemical and Biochemical Research, via G. Colombo, 81 20133 Milan, Italy.
| | - Annamaria Naggi
- G. Ronzoni Institute for Chemical and Biochemical Research, via G. Colombo, 81 20133 Milan, Italy
| | - Giangiacomo Torri
- G. Ronzoni Institute for Chemical and Biochemical Research, via G. Colombo, 81 20133 Milan, Italy
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Highly sulfated K5 Escherichia coli polysaccharide derivatives inhibit respiratory syncytial virus infectivity in cell lines and human tracheal-bronchial histocultures. Antimicrob Agents Chemother 2014; 58:4782-94. [PMID: 24914125 DOI: 10.1128/aac.02594-14] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Respiratory syncytial virus (RSV) exploits cell surface heparan sulfate proteoglycans (HSPGs) as attachment receptors. The interaction between RSV and HSPGs thus presents an attractive target for the development of novel inhibitors of RSV infection. In this study, selective chemical modification of the Escherichia coli K5 capsular polysaccharide was used to generate a collection of sulfated K5 derivatives with a backbone structure that mimics the heparin/heparan sulfate biosynthetic precursor. The screening of a series of N-sulfated (K5-NS), O-sulfated (K5-OS), and N,O-sulfated (K5-N,OS) derivatives with different degrees of sulfation revealed the highly sulfated K5 derivatives K5-N,OS(H) and K5-OS(H) to be inhibitors of RSV. Their 50% inhibitory concentrations were between 1.07 nM and 3.81 nM in two different cell lines, and no evidence of cytotoxicity was observed. Inhibition of RSV infection was maintained in binding and attachment assays but not in preattachment assays. Moreover, antiviral activity was also evident when the K5 derivatives were added postinfection, both in cell-to-cell spread and viral yield reduction assays. Finally, both K5-N,OS(H) and K5-OS(H) prevented RSV infection in human-derived tracheal/bronchial epithelial cells cultured to form a pseudostratified, highly differentiated model of the epithelial tissue of the human respiratory tract. Together, these features put K5-N,OS(H) and K5-OS(H) forward as attractive candidates for further development as RSV inhibitors.
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Sulfated Escherichia coli K5 polysaccharide derivatives inhibit dengue virus infection of human microvascular endothelial cells by interacting with the viral envelope protein E domain III. PLoS One 2013; 8:e74035. [PMID: 24015314 PMCID: PMC3755990 DOI: 10.1371/journal.pone.0074035] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 08/01/2013] [Indexed: 12/20/2022] Open
Abstract
Dengue virus (DENV) is an emerging mosquito-borne pathogen that causes cytokine-mediated alterations in the barrier function of the microvascular endothelium, leading to dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS). We observed that DENV (serotype 2) productively infects primary (HMVEC-d) and immortalized (HMEC-1) human dermal microvascular endothelial cells, despite the absence of well-described DENV receptors, such as dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN) or the mannose receptor on the cell surface. However, heparan sulfate proteoglycans (HSPGs) were highly expressed on these cells and pre-treatment of HMEC-1 cells with heparinase II or with glycosaminoglycans reduced DENV infectivity up to 90%, suggesting that DENV uses HSPGs as attachment receptor on microvascular endothelial cells. Sulfated Escherichia coli K5 derivatives, which are structurally similar to heparin/heparan sulfate but lack anticoagulant activity, were able to block DENV infection of HMEC-1 and HMVEC-d cells in the nanomolar range. The highly sulfated K5-OS(H) and K5-N,OS(H) inhibited virus attachment and subsequent entry into microvascular endothelial cells by interacting with the viral envelope (E) protein, as shown by surface plasmon resonance (SPR) analysis using the receptor-binding domain III of the E protein.
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