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Kalleda N, Flace A, Altermatt P, Ingoglia G, Doucerain C, Nyffenegger N, Dürrenberger F, Manolova V. Ferroportin inhibitor vamifeport ameliorates ineffective erythropoiesis in a mouse model of β-thalassemia with blood transfusions. Haematologica 2023; 108:2703-2714. [PMID: 37165842 PMCID: PMC10543196 DOI: 10.3324/haematol.2022.282328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 05/04/2023] [Indexed: 05/12/2023] Open
Abstract
β-thalassemia is an inherited anemia characterized by ineffective erythropoiesis. Blood transfusions are required for survival in transfusion-dependent β-thalassemia and are also occasionally needed in patients with non-transfusion-dependent β-thalassemia. Patients with transfusion-dependent b-thalassemia often have elevated transferrin saturation (TSAT) and non-transferrin-bound iron (NTBI) levels, which can lead to organ iron overload, oxidative stress, and vascular damage. Vamifeport is an oral ferroportin inhibitor that was previously shown to ameliorate anemia, ineffective erythropoiesis, and dysregulated iron homeostasis in the Hbbth3/+ mouse model of β-thalassemia, under non-transfused conditions. Our study aimed to assess the effects of oral vamifeport on iron-related parameters (including plasma NTBI levels) and ineffective erythropoiesis following blood transfusions in Hbbth3/+ mice. A single dose of vamifeport prevented the transient transfusion-mediated NTBI increase in Hbbth3/+ mice. Compared with vehicle treatment, vamifeport significantly increased hemoglobin levels and red blood cell counts in transfused mice. Vamifeport treatment also significantly improved ineffective erythropoiesis in the spleens of Hbbth3/+ mice, with additive effects observed when treatment was combined with repeated transfusions. Vamifeport corrected leukocyte counts and significantly improved iron-related parameters (serum transferrin, TSAT and erythropoietin levels) versus vehicle treatment in Hbbth3/+ mice, irrespective of transfusion status. In summary, vamifeport prevented transfusion-mediated NTBI formation in Hbbth3/+ mice. When given alone or combined with blood transfusions, vamifeport also ameliorated anemia, ineffective erythropoiesis, and dysregulated iron homeostasis. Administering vamifeport together with repeated blood transfusions additively ameliorated anemia and ineffective erythropoiesis in this mouse model, providing preclinical proof-of-concept for the efficacy of combining vamifeport with blood transfusions in β-thalassemia.
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Affiliation(s)
| | - Anna Flace
- Research and Non-clinical Development, CSL Vifor, St. Gallen
| | | | - Giada Ingoglia
- Research and Non-clinical Development, CSL Vifor, St. Gallen
| | | | | | | | - Vania Manolova
- Research and Non-clinical Development, CSL Vifor, St. Gallen
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Stetka J, Usart M, Kubovcakova L, Rai S, Rao TN, Sutter J, Hao-Shen H, Dirnhofer S, Geier F, Bader MS, Passweg JR, Manolova V, Dürrenberger F, Ahmed N, Schroeder T, Ganz T, Nemeth E, Silvestri L, Nai A, Camaschella C, Skoda RC. Iron is a modifier of the phenotypes of JAK2-mutant myeloproliferative neoplasms. Blood 2023; 141:2127-2140. [PMID: 36758212 DOI: 10.1182/blood.2022017976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 02/06/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
JAK 2-V617F mutation causes myeloproliferative neoplasms (MPNs) that can manifest as polycythemia vera (PV), essential thrombocythemia (ET), or primary myelofibrosis. At diagnosis, patients with PV already exhibited iron deficiency, whereas patients with ET had normal iron stores. We examined the influence of iron availability on MPN phenotype in mice expressing JAK2-V617F and in mice expressing JAK2 with an N542-E543del mutation in exon 12 (E12). At baseline, on a control diet, all JAK2-mutant mouse models with a PV-like phenotype displayed iron deficiency, although E12 mice maintained more iron for augmented erythropoiesis than JAK2-V617F mutant mice. In contrast, JAK2-V617F mutant mice with an ET-like phenotype had normal iron stores comparable with that of wild-type (WT) mice. On a low-iron diet, JAK2-mutant mice and WT controls increased platelet production at the expense of erythrocytes. Mice with a PV phenotype responded to parenteral iron injections by decreasing platelet counts and further increasing hemoglobin and hematocrit, whereas no changes were observed in WT controls. Alterations of iron availability primarily affected the premegakaryocyte-erythrocyte progenitors, which constitute the iron-responsive stage of hematopoiesis in JAK2-mutant mice. The orally administered ferroportin inhibitor vamifeport and the minihepcidin PR73 normalized hematocrit and hemoglobin levels in JAK2-V617F and E12 mutant mouse models of PV, suggesting that ferroportin inhibitors and minihepcidins could be used in the treatment for patients with PV.
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Affiliation(s)
- Jan Stetka
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Marc Usart
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Lucia Kubovcakova
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Shivam Rai
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Tata Nageswara Rao
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Joshua Sutter
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Hui Hao-Shen
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
| | - Stefan Dirnhofer
- Institute of Medical Genetics and Pathology, University Hospital Basel, Basel, Switzerland
| | - Florian Geier
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
| | - Michael S Bader
- Division of Hematology, University Hospital Basel, Basel, Switzerland
| | - Jakob R Passweg
- Division of Hematology, University Hospital Basel, Basel, Switzerland
| | | | | | - Nouraiz Ahmed
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule Zurich, Basel, Switzerland
| | - Timm Schroeder
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule Zurich, Basel, Switzerland
| | - Tomas Ganz
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA
| | - Elizabeta Nemeth
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA
| | - Laura Silvestri
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milan, Italy
- Vita Salute San Raffaele University, Milan, Italy
| | - Antonella Nai
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milan, Italy
- Vita Salute San Raffaele University, Milan, Italy
| | - Clara Camaschella
- Division of Genetics and Cell Biology, San Raffaele Scientific Institute, Milan, Italy
| | - Radek C Skoda
- Experimental Hematology, Department of Biomedicine, University Hospital Basel and University of Basel, Basel, Switzerland
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Lehmann EF, Liziczai M, Drożdżyk K, Altermatt P, Langini C, Manolova V, Sundstrom H, Dürrenberger F, Dutzler R, Manatschal C. Structures of ferroportin in complex with its specific inhibitor vamifeport. eLife 2023; 12:83053. [PMID: 36943194 PMCID: PMC10030120 DOI: 10.7554/elife.83053] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 02/27/2023] [Indexed: 03/18/2023] Open
Abstract
A central regulatory mechanism of iron homeostasis in humans involves ferroportin (FPN), the sole cellular iron exporter, and the peptide hormone hepcidin, which inhibits Fe2+ transport and induces internalization and degradation of FPN. Dysregulation of the FPN/hepcidin axis leads to diverse pathological conditions, and consequently, pharmacological compounds that inhibit FPN-mediated iron transport are of high clinical interest. Here, we describe the cryo-electron microscopy structures of human FPN in complex with synthetic nanobodies and vamifeport (VIT-2763), the first clinical-stage oral FPN inhibitor. Vamifeport competes with hepcidin for FPN binding and is currently in clinical development for β-thalassemia and sickle cell disease. The structures display two distinct conformations of FPN, representing outward-facing and occluded states of the transporter. The vamifeport site is located in the center of the protein, where the overlap with hepcidin interactions underlies the competitive relationship between the two molecules. The introduction of point mutations in the binding pocket of vamifeport reduces its affinity to FPN, emphasizing the relevance of the structural data. Together, our study reveals conformational rearrangements of FPN that are of potential relevance for transport, and it provides initial insight into the pharmacological targeting of this unique iron efflux transporter.
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Affiliation(s)
| | - Márton Liziczai
- Department of Biochemistry, University of Zurich, Zürich, Switzerland
| | | | | | - Cassiano Langini
- Department of Biochemistry, University of Zurich, Zürich, Switzerland
| | | | | | | | - Raimund Dutzler
- Department of Biochemistry, University of Zurich, Zürich, Switzerland
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Polesel M, Ingles-Prieto A, Christodoulaki E, Ferrada E, Doucerain C, Altermatt P, Knecht M, Kuhn M, Steck AL, Wilhelm M, Manolova V. Functional characterization of SLC39 family members ZIP5 and ZIP10 in overexpressing HEK293 cells reveals selective copper transport activity. Biometals 2023; 36:227-237. [PMID: 36454509 DOI: 10.1007/s10534-022-00474-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 11/20/2022] [Indexed: 12/04/2022]
Abstract
Zinc is the second most prevalent metal element present in living organisms, and control of its concentration is pivotal to physiology. The amount of zinc available to the cell cytoplasm is regulated by the activity of members of the SLC39 family, the ZIP proteins. Selectivity of ZIP transporters has been the focus of earlier studies which provided a biochemical and structural basis for the selectivity for zinc over other metals such as copper, iron, and manganese. However, several previous studies have shown how certain ZIP proteins exhibit higher selectivity for metal elements other than zinc. Sequence similarities suggest an evolutionary basis for the elemental selectivity within the ZIP family. Here, by engineering HEK293 cells to overexpress ZIP proteins, we have studied the selectivity of two phylogenetic clades of ZIP proteins, that is ZIP8/ZIP14 (previously known to be iron and manganese transporters) and ZIP5/ZIP10. By incubating ZIP over-expressing cells in presence of several divalent metals, we found that ZIP5 and ZIP10 are high affinity copper transporters with greater selectivity over other elements, revealing a novel substrate signature for the ZIP5/ZIP10 clade.
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Affiliation(s)
- Marcello Polesel
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland.
| | - Alvaro Ingles-Prieto
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Lazarettgasse 14, 1090, Vienna, Austria
| | - Eirini Christodoulaki
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Lazarettgasse 14, 1090, Vienna, Austria
| | - Evandro Ferrada
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Lazarettgasse 14, 1090, Vienna, Austria
| | - Cédric Doucerain
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Patrick Altermatt
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Michelle Knecht
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Michael Kuhn
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Anna-Lena Steck
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Maria Wilhelm
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
| | - Vania Manolova
- Vifor (International) AG, Wagistrasse 27a, 8952, Schlieren, Switzerland
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Vance SZ, Antypiuk A, Sharma R, Dürrenberger F, Manolova V, Vinchi F. S275: ALTERATION OF IRON HOMEOSTASIS THROUGH GENETIC AND PHARMACOLOGIC MODULATION OF FERROPORTIN MODIFIES MDS PATHOPHYSIOLOGY IN A PRECLINICAL MOUSE MODEL. Hemasphere 2022. [DOI: 10.1097/01.hs9.0000843992.90875.98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Dvorak V, Wiedmer T, Ingles-Prieto A, Altermatt P, Batoulis H, Bärenz F, Bender E, Digles D, Dürrenberger F, Heitman LH, IJzerman AP, Kell DB, Kickinger S, Körzö D, Leippe P, Licher T, Manolova V, Rizzetto R, Sassone F, Scarabottolo L, Schlessinger A, Schneider V, Sijben HJ, Steck AL, Sundström H, Tremolada S, Wilhelm M, Wright Muelas M, Zindel D, Steppan CM, Superti-Furga G. An Overview of Cell-Based Assay Platforms for the Solute Carrier Family of Transporters. Front Pharmacol 2021; 12:722889. [PMID: 34447313 PMCID: PMC8383457 DOI: 10.3389/fphar.2021.722889] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 07/19/2021] [Indexed: 12/12/2022] Open
Abstract
The solute carrier (SLC) superfamily represents the biggest family of transporters with important roles in health and disease. Despite being attractive and druggable targets, the majority of SLCs remains understudied. One major hurdle in research on SLCs is the lack of tools, such as cell-based assays to investigate their biological role and for drug discovery. Another challenge is the disperse and anecdotal information on assay strategies that are suitable for SLCs. This review provides a comprehensive overview of state-of-the-art cellular assay technologies for SLC research and discusses relevant SLC characteristics enabling the choice of an optimal assay technology. The Innovative Medicines Initiative consortium RESOLUTE intends to accelerate research on SLCs by providing the scientific community with high-quality reagents, assay technologies and data sets, and to ultimately unlock SLCs for drug discovery.
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Affiliation(s)
- Vojtech Dvorak
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Tabea Wiedmer
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Alvaro Ingles-Prieto
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | | | - Helena Batoulis
- Drug Discovery Sciences–Lead Discovery, Bayer Pharmaceuticals, Wuppertal, Germany
| | - Felix Bärenz
- Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany
| | - Eckhard Bender
- Drug Discovery Sciences–Lead Discovery, Bayer Pharmaceuticals, Wuppertal, Germany
| | - Daniela Digles
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | | | - Laura H. Heitman
- Division of Drug Discovery and Safety, LACDR, Leiden University, Leiden, Netherlands
| | - Adriaan P. IJzerman
- Division of Drug Discovery and Safety, LACDR, Leiden University, Leiden, Netherlands
| | - Douglas B. Kell
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, United Kingdom
- Novo Nordisk Foundation Centre for Biosustainability, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Stefanie Kickinger
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Daniel Körzö
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Philipp Leippe
- Department of Chemical Biology, Max Planck Institute for Medical Research, Heidelberg, Germany
| | - Thomas Licher
- Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany
| | | | | | | | | | - Avner Schlessinger
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Vanessa Schneider
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Hubert J. Sijben
- Division of Drug Discovery and Safety, LACDR, Leiden University, Leiden, Netherlands
| | | | | | | | | | - Marina Wright Muelas
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Diana Zindel
- Drug Discovery Sciences–Lead Discovery, Bayer Pharmaceuticals, Wuppertal, Germany
| | - Claire M. Steppan
- Pfizer Worldwide Research, Development and Medical, Groton, MA, United States
| | - Giulio Superti-Furga
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
- Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
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Porter J, Taher A, Viprakasit V, Kattamis A, Coates TD, Garbowski M, Dürrenberger F, Manolova V, Richard F, Cappellini MD. Oral ferroportin inhibitor vamifeport for improving iron homeostasis and erythropoiesis in β-thalassemia: current evidence and future clinical development. Expert Rev Hematol 2021; 14:633-644. [PMID: 34324404 DOI: 10.1080/17474086.2021.1935854] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
INTRODUCTION In β-thalassemia, imbalanced globin synthesis causes reduced red blood cell survival and ineffective erythropoiesis. Suppressed hepcidin levels increase ferroportin-mediated iron transport in enterocytes, causing increased iron absorption and potentially iron overload. Low hepcidin also stimulates ferroportin-mediated iron release from macrophages, increasing transferrin saturation (TSAT), potentially forming non-transferrin-bound iron, which can be toxic. Modulating the hepcidin-ferroportin axis is an attractive strategy to improve ineffective erythropoiesis and limit the potential tissue damage resulting from iron overload. There are no oral β-thalassemia treatments that consistently ameliorate anemia and prevent iron overload. AREAS COVERED The preclinical and clinical development of vamifeport (VIT-2763), a novel ferroportin inhibitor, was reviewed. PubMed, EMBASE and ClinicalTrials.gov were searched using the search term 'VIT-2763'. EXPERT OPINION Vamifeport is the first oral ferroportin inhibitor in clinical development. In healthy volunteers, vamifeport had comparable safety to placebo, was well tolerated and rapidly decreased iron levels and reduced TSAT, consistent with observations in preclinical models. Data from ongoing/planned Phase II studies are critical to define its potential in β-thalassemia and other conditions associated with iron overabsorption and/or ineffective erythropoiesis. If vamifeport potentially increases hemoglobin and reduces iron-related parameters, it could be a suitable treatment for non-transfusion-dependent and transfusion-dependent β-thalassemia.
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Affiliation(s)
- John Porter
- Professor of Haematology, Department of Haematology, University College London, Consultant in Haematology, University College London Hospitals and Head of Joint UCLH and Whittington Hospital Red Cell Unit, London, UK
| | - Ali Taher
- Professor of Medicine, Hematology and Oncology, Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Vip Viprakasit
- Professor of Pediatrics, Director, Thalassemia Research Program, Director, SiCORE in Advanced Cell & Gene Therapy Center (SiCORE-ACGT), Division of Hematology and Oncology, Department of Pediatrics & Siriraj Thalassemia Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Antonis Kattamis
- Professor of Pediatric Hematology-Oncology, Division of Pediatric Hematology-Oncology, First Department of Pediatrics, National and Kapodistrian University of Athens, Athens, Greece
| | - Thomas D Coates
- Section Head, Hematology, Cancer and Blood Disease Institute, Professor of Pediatrics and Pathology, Children's Hospital Los Angeles, University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - Maciej Garbowski
- Clinical Research Fellow, Department of Haematology, University College London Cancer Institute, London, UK
| | - Franz Dürrenberger
- Head of Chemical and Preclinical R&D, Vifor (International) AG, Chemical and Preclinical Research and Development, St. Gallen, Switzerland
| | - Vania Manolova
- Head of Biology R&D, Vifor (International) AG, Chemical and Preclinical Research and Development, St. Gallen, Switzerland
| | - Frank Richard
- Clinical Research Director, Vifor Pharma AG, Glattbrugg, Switzerland
| | - M Domenica Cappellini
- Professor of Internal Medicine, Department of Clinical Sciences and Community, University of Milan, Milan, Italy
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Superti-Furga G, Lackner D, Wiedmer T, Ingles-Prieto A, Barbosa B, Girardi E, Goldmann U, Gürtl B, Klavins K, Klimek C, Lindinger S, Liñeiro-Retes E, Müller AC, Onstein S, Redinger G, Reil D, Sedlyarov V, Wolf G, Crawford M, Everley R, Hepworth D, Liu S, Noell S, Piotrowski M, Stanton R, Zhang H, Corallino S, Faedo A, Insidioso M, Maresca G, Redaelli L, Sassone F, Scarabottolo L, Stucchi M, Tarroni P, Tremolada S, Batoulis H, Becker A, Bender E, Chang YN, Ehrmann A, Müller-Fahrnow A, Pütter V, Zindel D, Hamilton B, Lenter M, Santacruz D, Viollet C, Whitehurst C, Johnsson K, Leippe P, Baumgarten B, Chang L, Ibig Y, Pfeifer M, Reinhardt J, Schönbett J, Selzer P, Seuwen K, Bettembourg C, Biton B, Czech J, de Foucauld H, Didier M, Licher T, Mikol V, Pommereau A, Puech F, Yaligara V, Edwards A, Bongers BJ, Heitman LH, IJzerman AP, Sijben HJ, van Westen GJ, Grixti J, Kell DB, Mughal F, Swainston N, Wright-Muelas M, Bohstedt T, Burgess-Brown N, Carpenter L, Dürr K, Hansen J, Scacioc A, Banci G, Colas C, Digles D, Ecker G, Füzi B, Gamsjäger V, Grandits M, Martini R, Troger F, Altermatt P, Doucerain C, Dürrenberger F, Manolova V, Steck AL, Sundström H, Wilhelm M, Steppan CM. The RESOLUTE consortium: unlocking SLC transporters for drug discovery. Nat Rev Drug Discov 2020; 19:429-430. [DOI: 10.1038/d41573-020-00056-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Manolova V, Nyffenegger N, Flace A, Altermatt P, Varol A, Doucerain C, Sundstrom H, Dürrenberger F. Oral ferroportin inhibitor ameliorates ineffective erythropoiesis in a model of β-thalassemia. J Clin Invest 2019; 130:491-506. [PMID: 31638596 PMCID: PMC6934209 DOI: 10.1172/jci129382] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 10/08/2019] [Indexed: 01/01/2023] Open
Abstract
β-Thalassemia is a genetic anemia caused by partial or complete loss of β-globin synthesis, leading to ineffective erythropoiesis and RBCs with a short life span. Currently, there is no efficacious oral medication modifying anemia for patients with β-thalassemia. The inappropriately low levels of the iron regulatory hormone hepcidin enable excessive iron absorption by ferroportin, the unique cellular iron exporter in mammals, leading to organ iron overload and associated morbidities. Correction of unbalanced iron absorption and recycling by induction of hepcidin synthesis or treatment with hepcidin mimetics ameliorates β-thalassemia. However, hepcidin modulation or replacement strategies currently in clinical development all require parenteral drug administration. We identified oral ferroportin inhibitors by screening a library of small molecular weight compounds for modulators of ferroportin internalization. Restricting iron availability by VIT-2763, the first clinical stage oral ferroportin inhibitor, ameliorated anemia and the dysregulated iron homeostasis in the Hbbth3/+ mouse model of β-thalassemia intermedia. VIT-2763 not only improved erythropoiesis but also corrected the proportions of myeloid precursors in spleens of Hbbth3/+ mice. VIT-2763 is currently being developed as an oral drug targeting ferroportin for the treatment of β-thalassemia.
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Gomes AC, Flace A, Saudan P, Zabel F, Cabral-Miranda G, Turabi AE, Manolova V, Bachmann MF. Adjusted Particle Size Eliminates the Need of Linkage of Antigen and Adjuvants for Appropriated T Cell Responses in Virus-Like Particle-Based Vaccines. Front Immunol 2017; 8:226. [PMID: 28321220 PMCID: PMC5337491 DOI: 10.3389/fimmu.2017.00226] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 02/16/2017] [Indexed: 11/16/2022] Open
Abstract
Since the discovery of the first virus-like particle (VLP) derived from hepatitis B virus in 1980 (1), the field has expanded substantially. Besides successful use of VLPs as safe autologous virus-targeting vaccines, the powerful immunogenicity of VLPs has been also harnessed to generate immune response against heterologous and even self-antigens (2–4). Linking adjuvants to VLPs displaying heterologous antigen ensures simultaneous delivery of all vaccine components to the same antigen-presenting cells. As a consequence, antigen-presenting cells, such as dendritic cells, will process and present the antigen displayed on VLPs while receiving costimulatory signals by the VLP-incorporated adjuvant. Similarly, antigen-specific B cells recognizing the antigen linked to the VLP are simultaneously exposed to the adjuvant. Here, we demonstrate in mice that physical association of antigen, carrier (VLPs), and adjuvant is more critical for B than T cell responses. As a model system, we used the E7 protein from human papilloma virus, which spontaneously forms oligomers with molecular weight ranging from 158 kDa to 10 MDa at an average size of 50 nm. E7 oligomers were either chemically linked or simply mixed with VLPs loaded with DNA rich in non-methylated CG motifs (CpGs), a ligand for toll-like receptor 9. E7-specific IgG responses were strongly enhanced if the antigen was linked to the VLPs. In contrast, both CD4+ and CD8+ T cell responses as well as T cell-mediated protection against tumor growth were comparable for linked and mixed antigen formulations. Therefore, our data show that B cell but not T cell responses require antigen-linkage to the carrier and adjuvant for optimal vaccination outcome.
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Affiliation(s)
| | - Anna Flace
- Cytos Biotechnology AG , Schlieren , Switzerland
| | | | | | | | | | | | - Martin F Bachmann
- The Jenner Institute, Oxford University, Oxford, UK; Immunology, Inselspital, Bern, Switzerland
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Manolova V, Flace A, Jeandet P, Bessler WC, Pasquali C. Biomarkers Induced by the Immunomodulatory Bacterial Extract OM-85: Unique Roles for Peyer’s Patches and Intestinal Epithelial Cells. ACTA ACUST UNITED AC 2017. [DOI: 10.4172/2155-9899.1000494] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Uermösi C, Zabel F, Manolova V, Bauer M, Beerli RR, Senti G, Kündig TM, Saudan P, Bachmann MF. IgG-mediated down-regulation of IgE bound to mast cells: a potential novel mechanism of allergen-specific desensitization. Allergy 2014; 69:338-47. [PMID: 24354793 DOI: 10.1111/all.12327] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND Allergen-specific IgGs are known to inhibit IgE-mediated mast cell degranulation by two mechanisms, allergen-neutralization and engagement of the inhibitory FcγRIIB recruiting the phosphatase SHIP-1. Here we unravel an additional mechanism of IgG-mediated mast cell desensitization in mice: down-regulation of allergen-specific IgE. METHODS Mast cells were loaded in vitro and in vivo with monoclonal IgE antibodies specific for Fel d1 and exposed to immune complexes consisting of Fel d1-specific IgG antibodies recognizing different epitopes. Down regulation of IgE was followed by flow cytometry. RESULTS Mast cells loaded with 2 different IgE antibodies efficiently internalized the IgE antibodies if exposed to recombinant Feld d1. In contrast, no down-regulation occurred if mast cells were loaded with IgE antibodies exhibiting a single specificity before stimulation with recombinant Fel d1 [corrected]. Interestingly, however, IgEs of a single specificity were rapidly down-regulated in vitro and in vivo in the presence of Fel d1-specific monoclonal IgGs recognizing another epitope on Fel d1. Despite FceRI-internalization, little calcium flux or mast cell degranulation occurred. FcγRIIB played a dual role in the process since it enhanced IgE internalization and prevented cellular activation as documented by the inhibited calcium flux and mast cell degranulation. Similar observations were made in the presence of low concentrations of IgEs recognizing several epitopes on Fel d1. CONCLUSION We demonstrate here that Fel d1-specific IgG antibodies interact with FcγRIIB which (i) promotes IgE internalization; and (ii) inhibits mast cell activation. These results broaden our understanding of allergen-specific desensitization and may provide a mechanism for long-term desensitization of mast cells by selective removal of long-lived IgE antibodies on mast cells.
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Affiliation(s)
- C. Uermösi
- Cytos Biotechnology AG; Zurich-Schlieren Switzerland
| | - F. Zabel
- Department of Dermatology; Zurich University Hospital; Zurich Switzerland
| | - V. Manolova
- Cytos Biotechnology AG; Zurich-Schlieren Switzerland
| | - M. Bauer
- Intercell AG; Schlieren Switzerland
| | | | - G. Senti
- Department of Dermatology; Zurich University Hospital; Zurich Switzerland
| | - T. M. Kündig
- Department of Dermatology; Zurich University Hospital; Zurich Switzerland
| | - P. Saudan
- Cytos Biotechnology AG; Zurich-Schlieren Switzerland
| | - M. F. Bachmann
- Department of Dermatology; Zurich University Hospital; Zurich Switzerland
- The Jenner Institute; University of Oxford; Headington Oxford UK
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13
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Dürrenberger F, Abbate V, Ma Y, Arno MC, Jaiash D, Parmar A, Marshall V, Latunde-Dada GO, Zimmermann T, Senn D, Altermatt P, Manolova V, Hider RC, Bansal SS. Functional characterization of fluorescent hepcidin. Bioconjug Chem 2013; 24:1527-32. [PMID: 23888876 DOI: 10.1021/bc400121x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Hepcidin is a peptide hormone that regulates homeostasis in iron metabolism. It binds to the sole known cellular iron exporter ferroportin (Fpn), triggers its internalization, and thereby modulates the efflux of iron from cells. This functional property has been adopted in this study to assess the bioactivity and potency of a range of novel fluorescent hepcidin analogues. Hepcidin was selectively labeled with 6-carboxyfluorescein (CF) and 6-carboxytetramethylrhodamine (TMR) using Fmoc solid phase peptide chemistry. Internalization of Fpn by hepcidin was assessed by high-content microscopic analysis. Both K18- and M21K-labeled hepcidin with TMR and CF exhibited measurable potency when tested in cultured MDCK and T47D cells expressing human ferroportin. The bioactivity of the labeled hepcidin varies with the type of fluorophore and site of attachment of the fluorophores on the hepcidin molecule.
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Affiliation(s)
- Franz Dürrenberger
- Chemical Biology Group, Institute of Pharmaceutical Sciences, and ‡Nutrition and Diabetes Research Group, King's College London , Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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14
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Keller SA, Schwarz K, Manolova V, von Allmen CE, Kinzler MG, Bauer M, Muntwiler S, Saudan P, Bachmann MF. Innate signaling regulates cross-priming at the level of DC licensing and not antigen presentation. Eur J Immunol 2010; 40:103-12. [PMID: 19877013 DOI: 10.1002/eji.200939559] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Innate stimuli, such as TLR ligands, are known to greatly facilitate cross-priming. Currently it is unclear whether innate stimuli enhance cross-priming at the level of cross-presentation or at the level of T-cell priming. In this study, we addressed this question by measuring cross-presentation as well as cross-priming by virus-like particles (VLP) displaying peptide p33 derived of lymphocytic choriomeningitis virus. Innate stimuli were varied by either packaging different TLR ligands into virus-like particles or using mice deficient in two key molecules of TLR-signaling, namely the adaptor molecule MyD88 as well as IFN-alpha/beta receptor. While efficient cross-presentation occurred despite strongly reduced activation of DC in the absence of TLR ligand-mediated signals, T-cell priming was abolished. Thus, innate stimuli regulate cross-priming at the level of DC licensing for T-cell activation and not antigen presentation.
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15
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Keller SA, Bauer M, Manolova V, Muntwiler S, Saudan P, Bachmann MF. Cutting edge: limited specialization of dendritic cell subsets for MHC class II-associated presentation of viral particles. J Immunol 2009; 184:26-9. [PMID: 19949081 DOI: 10.4049/jimmunol.0901540] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Dendritic cells (DCs) are the most important APC. It was recently reported that there is a dichotomy for Ag presentation by DC subsets; exogenous Ags reach the MHC class I pathway, but not the MHC class II pathway, in CD8(+) DCs, whereas CD8(-) DCs only process Ags for the MHC class II pathway. In this study, we used virus-like particles (VLPs) to show that CD8(+) and CD8(-) DCs efficiently capture and process VLPs for presentation in association with MHC class II in vivo. In contrast, CD8(+) DCs, but not CD8(-) DCs, cross presented VLP-derived peptides. This pattern was changed in an FcgammaR-dependent fashion in the presence of VLP-specific Abs, because under those conditions both DC subsets failed to efficiently cross present. Thus, the presentation of viral particles to CD4(+) T cells is not restricted to distinct DC subsets, whereas the presentation of viral particles to CD8(+) T cells is limited to CD8(+) DCs.
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16
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Manolova V, Flace A, Bauer M, Schwarz K, Saudan P, Bachmann M. Nanoparticles target distinct dendritic cell populations according to their size. Eur J Immunol 2008; 38:1404-13. [DOI: 10.1002/eji.200737984] [Citation(s) in RCA: 890] [Impact Index Per Article: 55.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Manolova V, Flace A, Bauer M, Schwarz K, Saudan P, Bachmann M. Cover Picture: Nanoparticles target distinct dendritic cell populations according to their size – Eur. J. Immunol. 5/2008. Eur J Immunol 2008. [DOI: 10.1002/eji.200890018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Johansen P, Storni T, Rettig L, Qiu Z, Der-Sarkissian A, Smith KA, Manolova V, Lang KS, Senti G, Müllhaupt B, Gerlach T, Speck RF, Bot A, Kündig TM. Antigen kinetics determines immune reactivity. Proc Natl Acad Sci U S A 2008; 105:5189-94. [PMID: 18362362 PMCID: PMC2278203 DOI: 10.1073/pnas.0706296105] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2007] [Indexed: 01/01/2023] Open
Abstract
A current paradigm in immunology is that the strength of T cell responses is governed by antigen dose, localization, and costimulatory signals. This study investigates the influence of antigen kinetics on CD8 T cell responses in mice. A fixed cumulative antigen dose was administered by different schedules to produce distinct dose-kinetics. Antigenic stimulation increasing exponentially over days was a stronger stimulus for CD8 T cells and antiviral immunity than a single dose or multiple dosing with daily equal doses. The same was observed for dendritic cell vaccination, with regard to T cell and anti-tumor responses, and for T cells stimulated in vitro. In conclusion, stimulation kinetics per se was shown to be a separate parameter of immunogenicity. These findings warrant a revision of current immunization models and have implications for vaccine development and immunotherapy.
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Affiliation(s)
- Pål Johansen
- *Unit Experimental Immunotherapy, Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
| | - Tazio Storni
- *Unit Experimental Immunotherapy, Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
| | - Lorna Rettig
- *Unit Experimental Immunotherapy, Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
| | - Zhiyong Qiu
- MannKind Corporation, 28903 North Avenue Paine, Valencia, CA 91355
| | | | - Kent A. Smith
- MannKind Corporation, 28903 North Avenue Paine, Valencia, CA 91355
| | - Vania Manolova
- Cytos Biotechnology, Wagistrasse 25, CH-8952 Schlieren, Switzerland
| | - Karl S. Lang
- Institute of Experimental Immunology, University Hospital Zurich, Schmelzbergstrasse 12, CH-8091 Zurich, Switzerland
| | - Gabriela Senti
- *Unit Experimental Immunotherapy, Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
- Clinical Trials Center, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
| | - Beat Müllhaupt
- Department of Gastroenterology and Hepatology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland; and
| | - Tilman Gerlach
- Department of Gastroenterology and Hepatology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland; and
| | - Roberto F. Speck
- **Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland
| | - Adrian Bot
- MannKind Corporation, 28903 North Avenue Paine, Valencia, CA 91355
| | - Thomas M. Kündig
- *Unit Experimental Immunotherapy, Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, CH-8091 Zurich, Switzerland
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19
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Manolova V, Kistowska M, Paoletti S, Baltariu GM, Bausinger H, Hanau D, Mori L, De Libero G. Functional CD1a is stabilized by exogenous lipids. Eur J Immunol 2006; 36:1083-92. [PMID: 16598820 DOI: 10.1002/eji.200535544] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Self-glycosphingolipids bind to surface CD1 molecules and are readily displaced by other CD1 ligands. This capacity to exchange antigens at the cell surface is not common to other antigen-presenting molecules and its physiological importance is unclear. Here we show that a large pool of cell-surface CD1a, but not CD1b molecules, is stabilized by exogenous lipids present in serum. Under serum deprivation CD1a molecules are altered and functionally inactive, as they are unable to present lipid antigens to T cells. Glycosphingolipids and phospholipids bind to, and restore functionality to CD1a without the contribution of newly synthesized and recycling CD1a molecules. The dependence of CD1a stability on exogenous lipids is not related to its intracellular traffic and rather to its antigen-binding pockets. These results indicate a functional dichotomy between CD1a and CD1b molecules and provide new information on how the lipid antigenic repertoire is immunologically sampled.
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Affiliation(s)
- Vania Manolova
- Experimental Immunology, Department of Research University Hospital, Basel, Switzerland
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20
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Ruedl C, Schwarz K, Jegerlehner A, Storni T, Manolova V, Bachmann MF. Virus-like particles as carriers for T-cell epitopes: limited inhibition of T-cell priming by carrier-specific antibodies. J Virol 2005; 79:717-24. [PMID: 15613299 PMCID: PMC538584 DOI: 10.1128/jvi.79.2.717-724.2005] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Virus-like particles (VLPs) are able to induce cytotoxic T-cell responses in the absence of infection or replication. This makes VLPs promising candidates for the development of recombinant vaccines. However, VLPs are also potent inducers of B-cell responses, and it is generally assumed that such VLP-specific antibodies interfere with the induction of protective immune responses, a phenomenon summarized as carrier suppression. In this study, we investigated the impact of preexisting VLP-specific antibodies on the induction of specific cytotoxic T-cell and Th-cell responses in mice. The data show that VLP-specific antibodies did not measurably reduce antigen presentation in vitro or in vivo. Nevertheless, T-cell priming was slightly reduced by antigen-specific antibodies; however, the overall reduction was limited and vaccination with VLPs in the presence of VLP-specific antibodies still resulted in protective T-cell responses. Thus, carrier suppression is unlikely to be a limiting factor for VLP-based T-cell vaccines.
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Affiliation(s)
- Christiane Ruedl
- Cytos Biotechnology AG, Wagistrasse 25, 8952 Schlieren-Zürich, Switzerland
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21
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Schlaepfer E, Audigé A, von Beust B, Manolova V, Weber M, Joller H, Bachmann MF, Kundig TM, Speck RF. CpG oligodeoxynucleotides block human immunodeficiency virus type 1 replication in human lymphoid tissue infected ex vivo. J Virol 2004; 78:12344-54. [PMID: 15507621 PMCID: PMC525063 DOI: 10.1128/jvi.78.22.12344-12354.2004] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Oligodeoxynucleotides (ODNs) with immunomodulatory motifs control a number of microbial infections in animal models, presumably by acting through toll-like receptor 9 (TLR9) to induce a number of cytokines (e.g., alpha interferon and tumor necrosis factor alpha). The immunomodulatory motif consists of unmethylated sequences of cytosine and guanosine (CpG motif). ODNs without CpG motifs do not trigger TLR9. We hypothesized that triggering of TLR9 generates a cellular environment unfavorable for human immunodeficiency virus (HIV) replication. We tested this hypothesis in human lymphocyte cultures and found that phosphorothioate-modified ODN CpG2006 (type B ODNs) inhibited HIV replication nearly completely and prevented the loss of CD4(+) T cells. ODNs CpG2216 and CpG10 (type A ODNs) were less effective. CpG2006 blocked HIV replication in purified CD4(+) T cells and T-cell lines; CpG10 was ineffective in this setting, indicating that type A ODNs may inhibit HIV replication in CD4(+) T-cell lines indirectly through a separate cell subset. However, control ODNs without CpG motifs also showed anti-HIV effects, indicating that these effects are nonspecific and not due to TLR9 triggering. The mechanism of action is not clear. CpG2006 and its control ODN blocked syncytium formation in a cell fusion-based assay, but CpG10, CpG2216, and their control ODNs did not. The latter types interfered with the HIV replication cycle during disassembly or reverse transcription. In contrast, CpG2006 and CpG2216 specifically induced cytokines critical to initiation of the innate immune response. In summary, the nonspecific anti-HIV activity of CpG ODNs, their ability to stimulate HIV replication in latently infected cells, potentially resulting in their elimination, and their documented ability to link the innate and adaptive immune responses make them attractive candidates for further study as anti-HIV drugs.
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Affiliation(s)
- Erika Schlaepfer
- Division of Infectious Diseases and Hospital Epidemiology, Department of Internal Medicine, University Hospital of Zurich, Raemistrasse 100, 8091 Zurich, Switzerland
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22
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Bachmann MF, Schwarz K, Wolint P, Meijerink E, Martin S, Manolova V, Oxenius A. Cutting edge: distinct roles for T help and CD40/CD40 ligand in regulating differentiation of proliferation-competent memory CD8+ T cells. J Immunol 2004; 173:2217-21. [PMID: 15294930 DOI: 10.4049/jimmunol.173.4.2217] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Murine primary antiviral cytotoxic T cell (CTL) responses are often induced in the absence of Th cells. In this study, we show that virus-like particles, if combined with DNA rich in CpG motifs, efficiently trigger primary CTL responses and comparable frequencies of memory CTLs in the presence or absence of T help. However, memory CTLs primed in the absence of T help failed to proliferate upon viral challenge. Nevertheless, they were efficiently recruited to sites of inflammation, indicating that T help may regulate the balance between proliferation-competent and migration-competent memory CTLs. Surprisingly, generation of proliferation-competent memory CTLs was completely independent of CD40 or CD40L, molecules commonly assumed to be central for mediating the beneficial effects of Th cells on CTL development. Thus, Th cells but not CD40/CD40L are key for the differentiation of proliferation-competent central memory CD8(+) T cells.
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23
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Schwarz K, Storni T, Manolova V, Didierlaurent A, Sirard JC, Röthlisberger P, Bachmann MF. Role of Toll-like receptors in costimulating cytotoxic T cell responses. Eur J Immunol 2003; 33:1465-70. [PMID: 12778463 DOI: 10.1002/eji.200323919] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Stimulation of Toll-like receptors (TLR) by pathogen-derived compounds leads to activation of APC, facilitating the induction of protective immunity. This phenomenon is the basis of most adjuvant formulations currently in development. Here, we tested the ability of TLR2, 3, 4, 5, 7 and 9 signaling to enhance CTL responses upon vaccination with virus-like particles. Stimulation of TLR2 and 4 failed to increase CTL responses, whereas ligands for TLR3, 5 and 7 exhibited moderate adjuvant function. In contrast, stimulation of TLR9 dramatically increased CTL responses, indicating that ligands for TLR9 are likely to be the most promising candidates for the development of novel adjuvant formulations for stimulating CTL responses.
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24
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Abstract
CD1 molecules resemble classical MHC molecules in structure, bind self and bacterial glycolipids and present them to T cells. Whether the CD1 antigen-binding groove becomes filled during maturation and traffic to the cell surface is an important and still unsolved biological question. As most cell types synthesize complex glycosphingolipids (GSL), which also stimulate CD1-restricted T cells, it could be possible that these ligands associate with nascent CD1 molecules. Here, we show that treatment of cells with drugs blocking at different levels the de novo and salvage pathways of GSL synthesis does not prevent surface expression of CD1a and CD1b. Furthermore, transfection of CD1A and CD1B genes in a mutant cell line unable to synthesize glucosylceramides and galactosylceramides showed normal surface expression of both CD1 molecules. Lack of GSL did not induce intracellular CD1 accumulation as indicated by confocal microscopy. The same results were obtained by transfecting the Lec series of mutants, which are deficient in sugar addition to glycolipids and glycoproteins. These findings demonstrate that endogenous de novo synthesized GSL are not mandatory for CD1a and CD1b negotiating surface expression.
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Affiliation(s)
- Vania Manolova
- Experimental Immunology, Department of Research, University Hospital, Basel, Switzerland
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25
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De Libero G, Donda A, Gober HJ, Manolova V, Mazorra Z, Shamshiev A, Mori L. A new aspect in glycolipid biology: glycosphingolipids as antigens recognized by T lymphocytes. Neurochem Res 2002; 27:675-85. [PMID: 12374202 DOI: 10.1023/a:1020280201809] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
T cells may recognize a large variety of ligands with different chemical structures. Recently, glycosphingolipids have also been shown to stimulate human T lymphocytes. Recognition of glycosphingolipids is restricted by the nonpolymorphic CD1 molecules, expressed by professional antigen-presenting cells and by macrophages infiltrating inflammatory sites. CD1 molecules have a structure resembling that of classical MHC class I molecules, with the terminal extracellular domains characterized by two antiparallel alpha helices placed on two hydrophobic pockets. The glycosphingolipids bound to CD1 insert the lipid tails in the two pockets and position the hydrophilic head on the external part of CD1. The TCR interacts with aminoacids present in the two alpha helices and with residues provided by the carbohydrate moiety of glycosphingolipids and discriminates their structural variations. T cells recognizing self-glycosphingolipids release proinflammatory cytokines and may have a pathogenetic role in autoimmune diseases such as multiple sclerosis.
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Affiliation(s)
- G De Libero
- Experimental Immunology, University Hospital, Basel, Switzerland.
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26
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De Libero G, Donda A, Mori L, Manolova V, Shamshiev A. Immunity to glycolipid antigens in microbial infections. J BIOL REG HOMEOS AG 2001; 15:249-56. [PMID: 11693433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
T cells recognize ligands of different chemical structures. Recently, it has become clear that also self glycosphingolipids and bacterial lipoglycans may act as T cell stimulatory ligands. This type of antigen recognition is restricted by the non-polymorphic CD1 molecules, which have a structure resembling that of classical MHC molecules. Glycolipids insert their hydrophobic lipid tails in two pockets below the antigen-binding groove and position their hydrophilic heads on the external part of CD1 molecules. TCR interacts with these carbohydrates and discriminates their structural variations. Glycolipid-specific T cells may provide protection during bacterial and parasite infection probably with different mechanisms: by secreting pro-inflammatory lymphokines, by the direct killing of infected target cells, and by helping specific B cells in Ig production. Lipoglycans represent excellent candidates for new anti-microbial vaccines due to their wide distribution in the microbial world and their structural composition which does not change and thus cannot give rise to escape mutants. Moreover, these vaccines might induce anti-microbial protective T cell responses in the whole population due to the non-polymorphic nature of CD1 presenting molecules.
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Affiliation(s)
- G De Libero
- Experimental Immunology, University Hospital, Basel, Switzerland.
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27
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Kopchaliiska D, Stamenova M, Manolova V, Kehayov I, Dakovska L, Kyurkchiev S. Cross-reacting idiotypes on anti-insulin autoantibodies in autoimmune diseases, identified by monoclonal antibodies. Clin Immunol Immunopathol 1998; 87:130-8. [PMID: 9614927 DOI: 10.1006/clin.1997.4509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Investigations on the specific idiotypes of autoantibodies are supposed to help with the understanding of the control mechanisms participating in the pathogenesis of autoimmune diseases. This study describes three monoclonal antibodies (Mabs) that recognize distinct idiotypic determinants on anti-insulin autoantibodies. The preabsorption by IAA-positive sera of insulin inhibits their subsequent binding to the anti-Id, thus suggesting that the Mabs recognize epitopes located at or near the binding site of insulin autoantibodies (IAA). These idiotypes are detected in sera from patients with insulin-dependent diabetes mellitus (IDDM), which are IAA-negative, also. It is possible that the expression of the idiotypes recognized might generally be associated with induction of autoantibodies, since they were found in sera from patients with rheumatoid arthritis (RA), autoimmune thyroid disease (AITD), and cataract (K). It can be assumed that the corresponding idiotypes of these Mabs, or similar structures (sequential or conformational), are expressed on autoantibodies with various antigen-binding specificities. These data suggest that some autoimmune diseases are preceded by the secretion of autoantibodies which express a common or similar pathological idiotype.
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MESH Headings
- Adolescent
- Adult
- Aged
- Aged, 80 and over
- Animals
- Antibodies, Monoclonal/immunology
- Antibodies, Monoclonal/metabolism
- Antibody Specificity
- Arthritis, Rheumatoid/blood
- Arthritis, Rheumatoid/immunology
- Autoantibodies/blood
- Autoantibodies/immunology
- Autoantibodies/metabolism
- Autoimmune Diseases/blood
- Autoimmune Diseases/immunology
- Child
- Child, Preschool
- Cross Reactions
- Diabetes Mellitus, Type 1/blood
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 2/blood
- Diabetes Mellitus, Type 2/immunology
- Enzyme-Linked Immunosorbent Assay
- Female
- Humans
- Immunoglobulin Idiotypes/immunology
- Insulin/immunology
- Male
- Mice
- Mice, Inbred BALB C
- Middle Aged
- Thyroid Diseases/blood
- Thyroid Diseases/immunology
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Affiliation(s)
- D Kopchaliiska
- Department of Molecular Immunology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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28
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Kyurkchiev S, Ivanov G, Manolova V. Advanced glycosylated end products activate the functions of cell adhesion molecules on lymphoid cells. Cell Mol Life Sci 1997; 53:911-6. [PMID: 9447242 DOI: 10.1007/s000180050110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
It has been proposed that advanced glycosylated end products (AGEs) are involved in the pathogenesis of vascular damages in both type 1 and type 2 diabetes. Furthermore, it has been assumed that AGEs cause an alteration of both expression and activity of cell adhesion molecules which are responsible for migration of circulating cells through the endothelial layer of the vessels. The effect of AGEs on the activity of cell adhesion molecules was studied in our experiments using the homotypic adhesion assay, specific monoclonal antibodies and lymphoid cell lines. It was shown that proteins glycosylated in vitro seemed to increase the percentage of homotypic aggregation of lymphoid cells. This effect was mediated via the interaction between LFA-1 and ICAM-1 which was demonstrated by the fact that specific monoclonal antibodies against these cell adhesion molecules could block the effect of the AGEs. The results obtained reveal that the advanced glycosylated end products activate the function of cell adhesion molecules on lymphoid cells. It can be speculated that the activation of cell adhesion molecules might enhance the direct cellular contacts between the lymphoid cells in the immune response. Moreover, the effect of AGEs might be responsible for an enhanced adhesion of monocytes to endothelial cells and their migration through the vessel wall.
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Affiliation(s)
- S Kyurkchiev
- Department of Molecular Immunology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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