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Tong M, Liu P, Li C, Zhang Z, Sun W, Dong P, Fan N, Wang X, Liu J, Lv C, Cao Z, Wang Y. Interaction of Asn297-Linked Glycan Ligands with the Fc Fragment of the Immunoglobulin Class G1: A Molecular Dynamics Simulation Study. J Chem Inf Model 2024; 64:785-798. [PMID: 38262973 DOI: 10.1021/acs.jcim.3c01584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The allosteric modulation of the homodimeric H10-03-6 protein to glycan ligands L1 and L2, and the STAB19 protein to glycan ligands L3 and L4, respectively, has been studied by molecular dynamics simulations and free energy calculations. The results revealed that the STAB19 protein has a significantly higher affinity for L3 (-11.38 ± 2.32 kcal/mol) than that for L4 (-5.51 ± 1.92 kcal/mol). However, the combination of the H10-03-6 protein with glycan L2 (1.23 ± 6.19 kcal/mol) is energetically unfavorable compared with that of L1 (-13.96 ± 0.35 kcal/mol). Further, the binding of glycan ligands L3 and L4 to STAB19 would result in the significant closure of the two CH2 domains of the STAB19 conformation with the decrease of the centroid distances between the two CH2 domains compared with the H10-03-6/L1/L2 complex. The CH2 domain closure of STAB19 relates directly to the formation of new hydrogen bonds and hydrophobic interactions between the residues Ser239, Val240, Asp265, Glu293, Asn297, Thr299, Ser337, Asp376, Thr393, Pro395, and Pro396 in STAB19 and glycan ligands L3 and L4, which suggests that these key residues would contribute to the specific regulation of STAB19 to L3 and L4. In addition, the distance analysis revealed that the EF loop in the H10-03-6/L1/L2 model presents a high flexibility and partial disorder compared with the stabilized STAB19/L3/L4 complex. These results will be helpful in understanding the specific regulation through the asymmetric structural characteristics in the CH2 and CH3 domains of the H10-03-6 and STAB19 proteins.
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Affiliation(s)
- Mingqiong Tong
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Peng Liu
- Faculty of Electrical Engineering, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor Darul Takzim 81310, Malaysia
- The Office of Academic Affairs, Dezhou University, Dezhou 253023, China
| | - Chaoqun Li
- Hebei Key Laboratory of Heterocyclic Compounds, College of Chemistry, Chemical Engineering and Materials, Handan University, Handan, Hebei 056005, China
| | - Zhongyu Zhang
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Wan Sun
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Pingxuan Dong
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Na Fan
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Xiaoyue Wang
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Jing Liu
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, China
| | - Chao Lv
- College of Chemistry and Chemical Engineering, Dezhou University, Dezhou 253023, China
| | - Zanxia Cao
- Shandong Provincial Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou 253023, China
| | - Yan Wang
- College of Chemistry, Beijing Normal University, 19# Xinjiekouwai Street, Beijing 100875, China
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Kljaković-Gašpić Batinjan M, Petrović T, Vučković F, Hadžibegović I, Radovani B, Jurin I, Đerek L, Huljev E, Markotić A, Lukšić I, Trbojević-Akmačić I, Lauc G, Gudelj I, Čivljak R. Differences in Immunoglobulin G Glycosylation Between Influenza and COVID-19 Patients. ENGINEERING (BEIJING, CHINA) 2022; 26:S2095-8099(22)00631-2. [PMID: 36093331 PMCID: PMC9446557 DOI: 10.1016/j.eng.2022.08.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 08/01/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
The essential role of immunoglobulin G (IgG) in immune system regulation and combatting infectious diseases cannot be fully recognized without an understanding of the changes in its N-glycans attached to the asparagine 297 of the Fc domain that occur under such circumstances. These glycans impact the antibody stability, half-life, secretion, immunogenicity, and effector functions. Therefore, in this study, we analyzed and compared the total IgG glycome-at the level of individual glycan structures and derived glycosylation traits (sialylation, galactosylation, fucosylation, and bisecting N-acetylglucosamine (GlcNAc))-of 64 patients with influenza, 77 patients with coronavirus disease 2019 (COVID-19), and 56 healthy controls. Our study revealed a significant decrease in IgG galactosylation, sialylation, and bisecting GlcNAc (where the latter shows the most significant decrease) in deceased COVID-19 patients, whereas IgG fucosylation was increased. On the other hand, IgG galactosylation remained stable in influenza patients and COVID-19 survivors. IgG glycosylation in influenza patients was more time-dependent: In the first seven days of the disease, sialylation increased and fucosylation and bisecting GlcNAc decreased; in the next 21 days, sialylation decreased and fucosylation increased (while bisecting GlcNAc remained stable). The similarity of IgG glycosylation changes in COVID-19 survivors and influenza patients may be the consequence of an adequate immune response to enveloped viruses, while the observed changes in deceased COVID-19 patients may indicate its deviation.
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Affiliation(s)
| | - Tea Petrović
- Genos Glycoscience Research Laboratory, Zagreb 10000, Croatia
| | - Frano Vučković
- Genos Glycoscience Research Laboratory, Zagreb 10000, Croatia
| | - Irzal Hadžibegović
- Department of Cardiology, University Hospital Dubrava, Zagreb 10000, Croatia
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University, Osijek 31000, Croatia
| | - Barbara Radovani
- Department of Biotechnology, University of Rijeka, Rijeka 51000, Croatia
| | - Ivana Jurin
- Department of Cardiology, University Hospital Dubrava, Zagreb 10000, Croatia
| | - Lovorka Đerek
- Department for Laboratory Diagnostics, University Hospital Dubrava, Zagreb 10000, Croatia
| | - Eva Huljev
- Department for Acute Respiratory Infections, University Hospital for Infectious Diseases "Dr. Fran Mihaljević", Zagreb 10000, Croatia
| | - Alemka Markotić
- Department for Urogenital Infections, University Hospital for Infectious Diseases "Dr. Fran Mihaljević", Zagreb 10000, Croatia
- Department for Infectious Diseases, School of Medicine, Catholic University of Croatia, 10000 Zagreb, Croatia
- Postdoctoral Study, Faculty of Medicine, University of Rijeka, Rijeka 51000, Croatia
| | - Ivica Lukšić
- Department of Maxillofacial Surgery, University of Zagreb School of Medicine, Dubrava University Hospital, Zagreb 10000, Croatia
| | | | - Gordan Lauc
- Genos Glycoscience Research Laboratory, Zagreb 10000, Croatia
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Zagreb 10000, Croatia
| | - Ivan Gudelj
- Genos Glycoscience Research Laboratory, Zagreb 10000, Croatia
- Department of Biotechnology, University of Rijeka, Rijeka 51000, Croatia
| | - Rok Čivljak
- Department for Acute Respiratory Infections, University Hospital for Infectious Diseases "Dr. Fran Mihaljević", Zagreb 10000, Croatia
- Department of Infectious Diseases, University of Zagreb School of Medicine, Zagreb 10000, Croatia
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Baksmeier C, Blundell P, Steckel J, Schultz V, Gu Q, Da Silva Filipe A, Kohl A, Linnington C, Lu D, Dell A, Haslam S, Wang J, Czajkowsky D, Goebels N, Pleass RJ. Modified recombinant human IgG1-Fc is superior to natural intravenous immunoglobulin at inhibiting immune-mediated demyelination. Immunology 2021; 164:90-105. [PMID: 33880776 PMCID: PMC8358725 DOI: 10.1111/imm.13341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/23/2021] [Accepted: 03/31/2021] [Indexed: 12/13/2022] Open
Abstract
Intravenous immunoglobulin (IVIG) is an established treatment for numerous autoimmune conditions. Although Fc fragments derived from IVIG have shown efficacy in controlling immune thrombocytopenia in children, the mechanisms of action are unclear and controversial. The aim of this study was to dissect IVIG effector mechanisms using further adapted Fc fragments on demyelination in an ex vivo model of the central nervous system-immune interface. Using organotypic cerebellar slice cultures (OSCs) from transgenic mice, we induced extensive immune-mediated demyelination and oligodendrocyte loss with an antibody specific for myelin oligodendrocyte glycoprotein (MOG) and complement. Protective effects of adapted Fc fragments were assessed by live imaging of green fluorescent protein expression, immunohistochemistry and confocal microscopy. Cysteine- and glycan-adapted Fc fragments protected OSC from demyelination in a dose-dependent manner where equimolar concentrations of either IVIG or control Fc were ineffective. The protective effects of the adapted Fc fragments are partly attributed to interference with complement-mediated oligodendroglia damage. Transcriptome analysis ruled out signatures associated with inflammatory or innate immune responses. Taken together, our findings show that recombinant biomimetics can be made that are at least two hundred-fold more effective than IVIG in controlling demyelination by anti-MOG antibodies.
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Affiliation(s)
- Christine Baksmeier
- Department of NeurologyMedical FacultyHeinrich‐Heine‐University DuesseldorfDuesseldorfGermany
| | - Pat Blundell
- Department of Tropical Disease BiologyLiverpool School of Tropical MedicineLiverpoolUK
| | - Julia Steckel
- Department of NeurologyMedical FacultyHeinrich‐Heine‐University DuesseldorfDuesseldorfGermany
| | - Verena Schultz
- Institute of Infection, Immunity and InflammationCollege of Medical Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Quan Gu
- Institute of Infection, Immunity and InflammationCollege of Medical Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Ana Da Silva Filipe
- Institute of Infection, Immunity and InflammationCollege of Medical Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Alain Kohl
- Institute of Infection, Immunity and InflammationCollege of Medical Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Chris Linnington
- Institute of Infection, Immunity and InflammationCollege of Medical Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Dongli Lu
- Department of Life SciencesImperial College LondonLondonUK
| | - Anne Dell
- Department of Life SciencesImperial College LondonLondonUK
| | - Stuart Haslam
- Department of Life SciencesImperial College LondonLondonUK
| | - Jiabin Wang
- Shanghai Center for Systems BiomedicineKey Laboratory of Systems Biomedicine (Ministry of Education)Shanghai Jiao Tong UniversityShanghaiChina
| | - Dan Czajkowsky
- State Key Laboratory for Oncogenes and Related Genes and Bio‐ID CenterSchool of Biomedical EngineeringShanghai Jiao Tong UniversityShanghaiChina
| | - Norbert Goebels
- Department of NeurologyMedical FacultyHeinrich‐Heine‐University DuesseldorfDuesseldorfGermany
| | - Richard J. Pleass
- Department of Tropical Disease BiologyLiverpool School of Tropical MedicineLiverpoolUK
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Harvey DJ. ANALYSIS OF CARBOHYDRATES AND GLYCOCONJUGATES BY MATRIX-ASSISTED LASER DESORPTION/IONIZATION MASS SPECTROMETRY: AN UPDATE FOR 2015-2016. MASS SPECTROMETRY REVIEWS 2021; 40:408-565. [PMID: 33725404 DOI: 10.1002/mas.21651] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 07/24/2020] [Indexed: 06/12/2023]
Abstract
This review is the ninth update of the original article published in 1999 on the application of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2016. Also included are papers that describe methods appropriate to analysis by MALDI, such as sample preparation techniques, even though the ionization method is not MALDI. Topics covered in the first part of the review include general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation and arrays. The second part of the review is devoted to applications to various structural types such as oligo- and poly-saccharides, glycoproteins, glycolipids, glycosides and biopharmaceuticals. Much of this material is presented in tabular form. The third part of the review covers medical and industrial applications of the technique, studies of enzyme reactions and applications to chemical synthesis. The reported work shows increasing use of combined new techniques such as ion mobility and the enormous impact that MALDI imaging is having. MALDI, although invented over 30 years ago is still an ideal technique for carbohydrate analysis and advancements in the technique and range of applications show no sign of deminishing. © 2020 Wiley Periodicals, Inc.
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Affiliation(s)
- David J Harvey
- Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Roosevelt Drive, Oxford, OX3 7FZ, United Kingdom
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5
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Donini R, Haslam SM, Kontoravdi C. Glycoengineering Chinese hamster ovary cells: a short history. Biochem Soc Trans 2021; 49:915-931. [PMID: 33704400 PMCID: PMC8106501 DOI: 10.1042/bst20200840] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/26/2021] [Accepted: 02/08/2021] [Indexed: 12/25/2022]
Abstract
Biotherapeutic glycoproteins have revolutionised the field of pharmaceuticals, with new discoveries and continuous improvements underpinning the rapid growth of this industry. N-glycosylation is a critical quality attribute of biotherapeutic glycoproteins that influences the efficacy, half-life and immunogenicity of these drugs. This review will focus on the advances and future directions of remodelling N-glycosylation in Chinese hamster ovary (CHO) cells, which are the workhorse of recombinant biotherapeutic production, with particular emphasis on antibody products, using strategies such as cell line and protein backbone engineering.
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Affiliation(s)
- Roberto Donini
- Department of Life Sciences, Imperial College London, London SW7 2AZ, U.K
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, U.K
| | - Stuart M. Haslam
- Department of Life Sciences, Imperial College London, London SW7 2AZ, U.K
| | - Cleo Kontoravdi
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, U.K
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Pleass RJ. The therapeutic potential of sialylated Fc domains of human IgG. MAbs 2021; 13:1953220. [PMID: 34288809 PMCID: PMC8296966 DOI: 10.1080/19420862.2021.1953220] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/08/2021] [Accepted: 07/05/2021] [Indexed: 12/12/2022] Open
Abstract
Pathogens frequently use multivalent binding to sialic acid to infect cells or to modulate immunity through interactions with human sialic acid-binding immunoglobulin-type lectins (Siglecs). Molecules that interfere with these interactions could be of interest as diagnostics, anti-infectives or as immune modulators. This review describes the development of molecular scaffolds based on the crystallizable fragment (Fc) region of immunoglobulin (Ig) G that deliver high-avidity binding to innate immune receptors, including sialic acid-dependent receptors. The ways in which the sialylated Fc may be engineered as immune modulators that mimic the anti-inflammatory properties of intravenous polyclonal Ig or as blockers of sialic-acid-dependent infectivity by viruses are also discussed.
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Affiliation(s)
- Richard J. Pleass
- Department of Tropical Disease Biology, Tropical Disease Biology, Liverpool School of Tropical Medicine, Liverpool, UK
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Shock A, Humphreys D, Nimmerjahn F. Dissecting the mechanism of action of intravenous immunoglobulin in human autoimmune disease: Lessons from therapeutic modalities targeting Fcγ receptors. J Allergy Clin Immunol 2020; 146:492-500. [PMID: 32721416 DOI: 10.1016/j.jaci.2020.06.036] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/25/2020] [Accepted: 06/29/2020] [Indexed: 12/18/2022]
Abstract
Since the first description of the administration of high doses of pooled serum IgG, also referred to as intravenous IgG (IVIg) therapy, as being able to ameliorate various autoimmune diseases, researchers have been investigating which molecular and cellular pathways underlie IVIg activity. Apart from trying to understand the obvious conundrum that IgG can trigger both autoimmune pathology and resolution of inflammation, the rapidly expanding use of IVIg has led to a lack of availability of this primary blood product, providing a strong rationale for developing recombinant alternatives. During the last decade, a tremendous number of novel insights into IVIg activity brought the goal of replacing IVIg within reach, at least in select indications, and has led to the initiation of several clinical trials. At the forefront of this effort is the modulation of autoantibody half-life and blocking access of autoantibodies to fragment cystallizable γ receptors (Fcγ receptors). In this rostrum article, we will briefly discuss current models of IVIg activity, followed by a more specific focus on novel therapeutic avenues that are entering the clinic and may replace IVIg in the future.
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Affiliation(s)
| | | | - Falk Nimmerjahn
- Institute of Genetics, Department of Biology, Friedrich Alexander University of Erlangen-Nuremberg, Erlangen, Germany; Medical Immunology Campus Erlangen, Erlangen, Germany.
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Lewis BJ, Branch DR. Mouse Models of Rheumatoid Arthritis for Studies on Immunopathogenesis and Preclinical Testing of Fc Receptor-Targeting Biologics. Pharmacology 2020; 105:618-629. [DOI: 10.1159/000508239] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/27/2020] [Indexed: 11/19/2022]
Abstract
<b><i>Background:</i></b> Rheumatoid arthritis (RA) is a chronic autoimmune disease that causes inflammation, swelling, and pain in the joints and involves systemic complications. Mouse models of RA have been extensively used to model the pathogenesis of RA and to develop effective therapies. Although many components of the immune system have been studied in these models, the role of crystallizable fragment (Fc) gamma receptors (FcγRs) in RA has been sorely neglected. The aim of this review was to introduce the different mouse models of RA and to describe the different drug development strategies that have been tested in these models to target FcγR function, with the focus being on drugs that have been made from the Fc of immunoglobulin G (IgG). <b><i>Summary:</i></b> Evidence suggests that FcγRs play a major role in immune complex-induced inflammation in autoimmune diseases, such as RA. However, there is limited knowledge on the importance of FcγRs in the human disease even though there has been extensive work in mouse models of RA. Numerous mouse models of RA are available, with each model depicting certain aspects of the disease. Induced models of RA have nonspecific immune activation with cartilage-directed autoimmunity, whereas spontaneous models of RA develop without immunization, which results in a more chronic form of arthritis. These models have been used to test FcγR-targeting monoclonal antibodies, intravenous immunoglobulin (IVIg), subcutaneously administered IVIg, and recombinant Fcs for their ability to interact with and modify FcγR function. Recombinant Fcs avidly bind FcγRs and exhibit enhanced therapeutic efficacy in mouse models of RA. <b><i>Key Message:</i></b> The therapeutic utility of targeting FcγRs with recombinant Fcs is great and should be explored in human clinical trials for autoimmune diseases, such as RA.
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Ohyama Y, Nakajima K, Renfrow MB, Novak J, Takahashi K. Mass spectrometry for the identification and analysis of highly complex glycosylation of therapeutic or pathogenic proteins. Expert Rev Proteomics 2020; 17:275-296. [PMID: 32406805 DOI: 10.1080/14789450.2020.1769479] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
INTRODUCTION Protein glycosylation influences characteristics such as folding, stability, protein interactions, and solubility. Therefore, glycan moieties of therapeutic proteins and proteins that are likely associated with disease pathogenesis should be analyzed in-depth, including glycan heterogeneity and modification sites. Recent advances in analytical methods and instrumentation have enabled comprehensive characterization of highly complex glycosylated proteins. AREA COVERED The following aspects should be considered when analyzing glycosylated proteins: sample preparation, chromatographic separation, mass spectrometry (MS) and fragmentation methods, and bioinformatics, such as software solutions for data analyses. Notably, analysis of glycoproteins with heavily sialylated glycans or multiple glycosylation sites requires special considerations. Here, we discuss recent methodological advances in MS that provide detailed characterization of heterogeneous glycoproteins. EXPERT OPINION As characterization of complex glycosylated proteins is still analytically challenging, the function or pathophysiological significance of these proteins is not fully understood. To reproducibly produce desired forms of therapeutic glycoproteins or to fully elucidate disease-specific patterns of protein glycosylation, a highly reproducible and robust analytical platform(s) should be established. In addition to advances in MS instrumentation, optimization of analytical and bioinformatics methods and utilization of glycoprotein/glycopeptide standards is desirable. Ultimately, we envision that an automated high-throughput MS analysis will provide additional power to clinical studies and precision medicine.
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Affiliation(s)
- Yukako Ohyama
- Department of Nephrology, Fujita Health University School of Medicine , Toyoake, Japan.,Department of Biomedical Molecular Sciences, Fujita Health University School of Medicine , Toyoake, Japan
| | - Kazuki Nakajima
- Center for Research Promotion and Support, Fujita Health University , Toyoake, Japan
| | - Matthew B Renfrow
- Departments of Biochemistry and Molecular Genetics and Microbiology, University of Alabama at Birmingham , Birmingham, AL, USA
| | - Jan Novak
- Departments of Biochemistry and Molecular Genetics and Microbiology, University of Alabama at Birmingham , Birmingham, AL, USA
| | - Kazuo Takahashi
- Department of Nephrology, Fujita Health University School of Medicine , Toyoake, Japan.,Department of Biomedical Molecular Sciences, Fujita Health University School of Medicine , Toyoake, Japan.,Departments of Biochemistry and Molecular Genetics and Microbiology, University of Alabama at Birmingham , Birmingham, AL, USA
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Blundell PA, Lu D, Dell A, Haslam S, Pleass RJ. Choice of Host Cell Line Is Essential for the Functional Glycosylation of the Fc Region of Human IgG1 Inhibitors of Influenza B Viruses. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2020; 204:1022-1034. [PMID: 31907284 PMCID: PMC6994840 DOI: 10.4049/jimmunol.1901145] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 12/02/2019] [Indexed: 12/11/2022]
Abstract
Abs are glycoproteins that carry a conserved N-linked carbohydrate attached to the Fc whose presence and fine structure profoundly impacts on their in vivo immunogenicity, pharmacokinetics, and functional attributes. The host cell line used to produce IgG plays a major role in this glycosylation, as different systems express different glycosylation enzymes and transporters that contribute to the specificity and heterogeneity of the final IgG-Fc glycosylation profile. In this study, we compare two panels of glycan-adapted IgG1-Fc mutants expressed in either the human endothelial kidney 293-F or Chinese hamster ovary-K1 systems. We show that the types of N-linked glycans between matched pairs of Fc mutants vary greatly and in particular, with respect, to sialylation. These cell line effects on glycosylation profoundly influence the ability of the engineered Fcs to interact with either human or pathogen receptors. For example, we describe Fc mutants that potently disrupted influenza B-mediated agglutination of human erythrocytes when expressed in Chinese hamster ovary-K1, but not in human endothelial kidney 293-F cells.
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Affiliation(s)
- Patricia A Blundell
- Department of Tropical Disease Biology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom; and
| | - Dongli Lu
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Anne Dell
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Stuart Haslam
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Richard J Pleass
- Department of Tropical Disease Biology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom; and
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11
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Scherg F, Haag F, Krieger T. Off-label application of intravenous immunoglobulin (IVIG) for treatment of Cogan's syndrome during pregnancy. BMJ Case Rep 2019; 12:e227917. [PMID: 31604714 PMCID: PMC6803144 DOI: 10.1136/bcr-2018-227917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/05/2019] [Indexed: 11/03/2022] Open
Abstract
We report the case of a woman with Cogan's syndrome concomitant with the wish to have children. After three major flares of the disease that led to unilateral deafness, immunosuppressive therapy with prednisolone and azathioprine was started. Because of the severe side effects, an off-label therapy with intravenous immunoglobulin (IVIG) was initiated, under which our patient has since given birth to three healthy children. To our knowledge this is the first report to describe Cogan's syndrome with multiple successful pregnancies under IVIG treatment.
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Affiliation(s)
- Felix Scherg
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Friedrich Haag
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thorsten Krieger
- Institute of Clinical Chemistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Department of Primary Immunodeficiencies, MVZ Rheumatologie und Autoimmunmedizin GmbH, Hamburg, Germany
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12
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Next-generation Fc receptor–targeting biologics for autoimmune diseases. Autoimmun Rev 2019; 18:102366. [DOI: 10.1016/j.autrev.2019.102366] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 04/11/2019] [Indexed: 01/04/2023]
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14
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Abstract
The precise mechanisms underlying anti-inflammatory effects of intravenous immunoglobulin (IVIg) therapies remain elusive. The sialylated IgG fraction within IVIg has been shown to be therapeutically more active in mouse models. Functionally, it has been suggested that IgG undergoes conformational changes upon Fc-sialylation which sterically impede binding to conventional FcγRs, but simultaneously allow binding to human DC-SIGN (SIGN-R1 in mice) and also CD23. These latter C-type lectins have been proposed responsible for the immunomodulatory effects in mouse models. However, there is conflicting evidence supporting direct interactions between sialylated human IgG and CD23/DC-SIGN. While cells expressing human CD23 and DC-SIGN in their native configuration bound their natural ligands IgE and ICAM-3, respectively, no IgG binding was observed, regardless of Fc-glycan sialylation in any context (with or without bisection and/or fucosylation) or presence of sialylated Fab-glycans. This was tested by both by FACS and a novel cellular Surface Plasmon Resonance imaging (cSPRi) approach allowing for monitoring low-affinity but high-avidity interactions. In summary, we find no evidence for human CD23 or DC-SIGN being bona fide receptors to human IgG, regardless of IgG Fc- or Fab-glycosylation status. However, these results do not exclude the possibility that either IgG glycosylation or C-type lectins affect IVIg therapies.
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Saunders KO. Conceptual Approaches to Modulating Antibody Effector Functions and Circulation Half-Life. Front Immunol 2019; 10:1296. [PMID: 31231397 PMCID: PMC6568213 DOI: 10.3389/fimmu.2019.01296] [Citation(s) in RCA: 189] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 05/21/2019] [Indexed: 12/31/2022] Open
Abstract
Antibodies and Fc-fusion antibody-like proteins have become successful biologics developed for cancer treatment, passive immunity against infection, addiction, and autoimmune diseases. In general these biopharmaceuticals can be used for blocking protein:protein interactions, crosslinking host receptors to induce signaling, recruiting effector cells to targets, and fixing complement. With the vast capability of antibodies to affect infectious and genetic diseases much effort has been placed on improving and tailoring antibodies for specific functions. While antibody:antigen engagement is critical for an efficacious antibody biologic, equally as important are the hinge and constant domains of the heavy chain. It is the hinge and constant domains of the antibody that engage host receptors or complement protein to mediate a myriad of effector functions and regulate antibody circulation. Molecular and structural studies have provided insight into how the hinge and constant domains from antibodies across different species, isotypes, subclasses, and alleles are recognized by host cell receptors and complement protein C1q. The molecular details of these interactions have led to manipulation of the sequences and glycosylation of hinge and constant domains to enhance or reduce antibody effector functions and circulating half-life. This review will describe the concepts being applied to optimize the hinge and crystallizable fragment of antibodies, and it will detail how these interactions can be tuned up or down to mediate a biological function that confers a desired disease outcome.
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Affiliation(s)
- Kevin O. Saunders
- Laboratory of Protein Expression, Departments of Surgery, Molecular Genetics and Microbiology, and Immunology, Duke University Medical Center, Duke Human Vaccine Institute, Durham, NC, United States
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16
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Blundell PA, Lu D, Wilkinson M, Dell A, Haslam S, Pleass RJ. Insertion of N-Terminal Hinge Glycosylation Enhances Interactions of the Fc Region of Human IgG1 Monomers with Glycan-Dependent Receptors and Blocks Hemagglutination by the Influenza Virus. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2019; 202:1595-1611. [PMID: 30683699 PMCID: PMC6379808 DOI: 10.4049/jimmunol.1801337] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 12/29/2018] [Indexed: 11/28/2022]
Abstract
In therapeutic applications in which the Fc of IgG is critically important, the receptor binding and functional properties of the Fc are lost after deglycosylation or removal of the unique Asn297 N-X-(T/S) sequon. A population of Fcs bearing sialylated glycans has been identified as contributing to this functionality, and high levels of sialylation also lead to longer serum retention times advantageous for therapy. The efficacy of sialylated Fc has generated an incentive to modify the unique N-linked glycosylation site at Asn297, either through chemical and enzymatic methods or by mutagenesis of the Fc, that disrupts the protein-Asn297 carbohydrate interface. In this study, we took an alternative approach by inserting or deleting N-linked attachment sites into the body of the Fc to generate a portfolio of mutants with tailored effector functions. For example, we describe mutants with enhanced binding to low-affinity inhibitory human Fcγ and glycan receptors that may be usefully incorporated into existing Ab engineering approaches to treat or vaccinate against disease. The IgG1 Fc fragments containing complex sialylated glycans attached to the N-terminal Asn221 sequon bound influenza virus hemagglutinin and disrupted influenza A-mediated agglutination of human erythrocytes.
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Affiliation(s)
- Patricia A Blundell
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom; and
| | - Dongli Lu
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Mark Wilkinson
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom; and
| | - Anne Dell
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Stuart Haslam
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Richard J Pleass
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom; and
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17
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18
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Engineered hexavalent Fc proteins with enhanced Fc-gamma receptor avidity provide insights into immune-complex interactions. Commun Biol 2018; 1:146. [PMID: 30272022 PMCID: PMC6138732 DOI: 10.1038/s42003-018-0149-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 08/22/2018] [Indexed: 12/14/2022] Open
Abstract
Autoantibody-mediated diseases are currently treated with intravenous immunoglobulin, which is thought to act in part via blockade of Fc gamma receptors, thereby inhibiting autoantibody effector functions and subsequent pathology. We aimed to develop recombinant molecules with enhanced Fc receptor avidity and thus increased potency over intravenous immunoglobulin. Here we describe the molecular engineering of human Fc hexamers and explore their therapeutic and safety profiles. We show Fc hexamers were more potent than IVIG in phagocytosis blockade and disease models. However, in human whole-blood safety assays incubation with IgG1 isotype Fc hexamers resulted in cytokine release, platelet and complement activation, whereas the IgG4 version did not. We used a statistically designed mutagenesis approach to identify the key Fc residues involved in these processes. Cytokine release was found to be dependent on neutrophil FcγRIIIb interactions with L234 and A327 in the Fc. Therefore, Fc hexamers provide unique insights into Fc receptor biology. Tania Rowley et al. present multivalent Fc molecules with enhanced avidity for Fc gamma receptors in order to improve the treatment of autoantibody-mediated human diseases. They found several key amino acids involved in Fc receptor binding interactions.
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19
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Tradtrantip L, Felix CM, Spirig R, Morelli AB, Verkman A. Recombinant IgG1 Fc hexamers block cytotoxicity and pathological changes in experimental in vitro and rat models of neuromyelitis optica. Neuropharmacology 2018; 133:345-353. [PMID: 29428821 PMCID: PMC6322534 DOI: 10.1016/j.neuropharm.2018.02.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 01/26/2018] [Accepted: 02/02/2018] [Indexed: 12/17/2022]
Abstract
Intravenous human immunoglobulin G (IVIG) may have therapeutic benefit in neuromyelitis optica spectrum disorders (herein called NMO), in part because of the anti-inflammatory properties of the IgG Fc region. Here, we evaluated recombinant Fc hexamers consisting of the IgM μ-tailpiece fused with the Fc region of human IgG1. In vitro, the Fc hexamers prevented cytotoxicity in aquaporin-4 (AQP4) expressing cells and in rat spinal cord slice cultures exposed to NMO anti-AQP4 autoantibody (AQP4-IgG) and complement, with >500-fold greater potency than IVIG or monomeric Fc fragments. Fc hexamers at low concentration also prevented antibody-dependent cellular cytotoxicity produced by AQP4-IgG and natural killer cells. Serum from rats administered a single intravenous dose of Fc hexamers at 50 mg/kg taken at 8 h did not produce complement-dependent cytotoxicity when added to AQP4-IgG-treated AQP4-expressing cell cultures. In an experimental rat model of NMO produced by intracerebral injection of AQP4-IgG, Fc hexamers at 50 mg/kg administered before and at 12 h after AQP4-IgG fully prevented astrocyte injury, complement activation, inflammation and demyelination. These results support the potential therapeutic utility of recombinant IgG1 Fc hexamers in AQP4-IgG seropositive NMO.
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Affiliation(s)
- Lukmanee Tradtrantip
- Departments of Medicine and Physiology, University of California, San Francisco, CA, USA
| | - Christian M. Felix
- Departments of Medicine and Physiology, University of California, San Francisco, CA, USA
| | | | | | - A.S. Verkman
- Departments of Medicine and Physiology, University of California, San Francisco, CA, USA
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20
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Spirig R, Campbell IK, Koernig S, Chen CG, Lewis BJB, Butcher R, Muir I, Taylor S, Chia J, Leong D, Simmonds J, Scotney P, Schmidt P, Fabri L, Hofmann A, Jordi M, Spycher MO, Cattepoel S, Brasseit J, Panousis C, Rowe T, Branch DR, Baz Morelli A, Käsermann F, Zuercher AW. rIgG1 Fc Hexamer Inhibits Antibody-Mediated Autoimmune Disease via Effects on Complement and FcγRs. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2018; 200:2542-2553. [PMID: 29531170 PMCID: PMC5890536 DOI: 10.4049/jimmunol.1701171] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 02/13/2018] [Indexed: 12/27/2022]
Abstract
Activation of Fc receptors and complement by immune complexes is a common important pathogenic trigger in many autoimmune diseases and so blockade of these innate immune pathways may be an attractive target for treatment of immune complex-mediated pathomechanisms. High-dose IVIG is used to treat autoimmune and inflammatory diseases, and several studies demonstrate that the therapeutic effects of IVIG can be recapitulated with the Fc portion. Further, recent data indicate that recombinant multimerized Fc molecules exhibit potent anti-inflammatory properties. In this study, we investigated the biochemical and biological properties of an rFc hexamer (termed Fc-μTP-L309C) generated by fusion of the IgM μ-tailpiece to the C terminus of human IgG1 Fc. Fc-μTP-L309C bound FcγRs with high avidity and inhibited FcγR-mediated effector functions (Ab-dependent cell-mediated cytotoxicity, phagocytosis, respiratory burst) in vitro. In addition, Fc-μTP-L309C prevented full activation of the classical complement pathway by blocking C2 cleavage, avoiding generation of inflammatory downstream products (C5a or sC5b-9). In vivo, Fc-μTP-L309C suppressed inflammatory arthritis in mice when given therapeutically at approximately a 10-fold lower dose than IVIG, which was associated with reduced inflammatory cytokine production and complement activation. Likewise, administration of Fc-μTP-L309C restored platelet counts in a mouse model of immune thrombocytopenia. Our data demonstrate a potent anti-inflammatory effect of Fc-μTP-L309C in vitro and in vivo, likely mediated by blockade of FcγRs and its unique inhibition of complement activation.
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Affiliation(s)
| | - Ian K Campbell
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Sandra Koernig
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Chao-Guang Chen
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Bonnie J B Lewis
- Centre for Innovation Canadian Blood Services, Toronto, Ontario K1G 4J5, Canada; and
- Department of Medicine, University of Toronto, Toronto, Ontario M5G 2M1, Canada
| | - Rebecca Butcher
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Ineke Muir
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Shirley Taylor
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Jenny Chia
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - David Leong
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Jason Simmonds
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Pierre Scotney
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Peter Schmidt
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Louis Fabri
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | | | | | | | | | | | - Con Panousis
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Tony Rowe
- CSL Ltd., Bio21 Institute, Parkville, Victoria 3010, Australia
| | - Donald R Branch
- Centre for Innovation Canadian Blood Services, Toronto, Ontario K1G 4J5, Canada; and
- Department of Medicine, University of Toronto, Toronto, Ontario M5G 2M1, Canada
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21
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Ortiz DF, Lansing JC, Rutitzky L, Kurtagic E, Prod'homme T, Choudhury A, Washburn N, Bhatnagar N, Beneduce C, Holte K, Prenovitz R, Child M, Killough J, Tyler S, Brown J, Nguyen S, Schwab I, Hains M, Meccariello R, Markowitz L, Wang J, Zouaoui R, Simpson A, Schultes B, Capila I, Ling L, Nimmerjahn F, Manning AM, Bosques CJ. Elucidating the interplay between IgG-Fc valency and FcγR activation for the design of immune complex inhibitors. Sci Transl Med 2017; 8:365ra158. [PMID: 27856797 DOI: 10.1126/scitranslmed.aaf9418] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 09/29/2016] [Indexed: 12/18/2022]
Abstract
Autoantibody immune complex (IC) activation of Fcγ receptors (FcγRs) is a common pathogenic hallmark of multiple autoimmune diseases. Given that the IC structural features that elicit FcγR activation are poorly understood and the FcγR system is highly complex, few therapeutics can directly block these processes without inadvertently activating the FcγR system. To address these issues, the structure activity relationships of an engineered panel of multivalent Fc constructs were evaluated using sensitive FcγR binding and signaling cellular assays. These studies identified an Fc valency with avid binding to FcγRs but without activation of immune cell effector functions. These observations directed the design of a potent trivalent immunoglobulin G-Fc molecule that broadly inhibited IC-driven processes in a variety of immune cells expressing FcγRs. The Fc trimer, Fc3Y, was highly efficacious in three different animal models of autoimmune diseases. This recombinant molecule may represent an effective therapeutic candidate for FcγR-mediated autoimmune diseases.
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Affiliation(s)
- Daniel F Ortiz
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Jonathan C Lansing
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Laura Rutitzky
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Elma Kurtagic
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Thomas Prod'homme
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Amit Choudhury
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Nathaniel Washburn
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Naveen Bhatnagar
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | | | - Kimberly Holte
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Robert Prenovitz
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Matthew Child
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Jason Killough
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Steven Tyler
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Julia Brown
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Stephanie Nguyen
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Inessa Schwab
- Department of Biology, Institute of Genetics, University of Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Maurice Hains
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Robin Meccariello
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Lynn Markowitz
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Jing Wang
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Radouane Zouaoui
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Allison Simpson
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Birgit Schultes
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Ishan Capila
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Leona Ling
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Falk Nimmerjahn
- Department of Biology, Institute of Genetics, University of Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Anthony M Manning
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Carlos J Bosques
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA.
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22
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Multivalent Fcγ-receptor engagement by a hexameric Fc-fusion protein triggers Fcγ-receptor internalisation and modulation of Fcγ-receptor functions. Sci Rep 2017; 7:17049. [PMID: 29213127 PMCID: PMC5719016 DOI: 10.1038/s41598-017-17255-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 11/17/2017] [Indexed: 12/14/2022] Open
Abstract
Engagement of Fcγ-receptors triggers a range of downstream signalling events resulting in a diverse array of immune functions. As a result, blockade of Fc-mediated function is an important strategy for the control of several autoimmune and inflammatory conditions. We have generated a hexameric-Fc fusion protein (hexameric-Fc) and tested the consequences of multi-valent Fcγ-receptor engagement in in vitro and in vivo systems. In vitro engagement of hexameric-Fc with FcγRs showed complex binding interactions that altered with receptor density and triggered the internalisation and degradation of Fcγ-receptors. This caused a disruption of Fc-binding and phagocytosis. In vivo, in a mouse ITP model we observed a short half-life of hexameric-Fc but were nevertheless able to observe inhibition of platelet phagocytosis several days after hexameric-Fc dosing. In cynomolgus monkeys, we again observed a short half-life, but were able to demonstrate effective FcγR blockade. These findings demonstrate the ability of multi-valent Fc-based therapeutics to interfere with FcγR function and a potential mechanism through which they could have a sustained effect; the internalisation and degradation of FcγRs.
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23
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Hill DL, Schofield L, Wilson DW. IgG opsonization of merozoites: multiple immune mechanisms for malaria vaccine development. Int J Parasitol 2017; 47:585-595. [PMID: 28668325 DOI: 10.1016/j.ijpara.2017.05.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 04/12/2017] [Accepted: 05/12/2017] [Indexed: 02/07/2023]
Abstract
Global eradication of the human-infecting malaria parasite Plasmodium falciparum, the major cause of malaria mortality, is unlikely to be achieved without an effective vaccine. However, our limited understanding of how protective immune responses target malaria parasites in humans, and how to best elicit these immune responses through vaccination, has hampered vaccine development. The red blood cell invading stage of the parasite lifecycle (merozoite) displays antigens that are attractive vaccine candidates as they are accessible to antibodies and raise high antibody titres in naturally immune individuals. The number of merozoite antigens that elicit an immune response, and their structural and functional diversity, has led to a large number of lead antigens being pursued as vaccine candidates. Despite being seemingly spoilt for choice in terms of vaccine candidates, there is still a lack of consensus on exactly how merozoite antibodies reduce parasitemia and malaria disease. In this review we describe the various immune mechanisms that can result from IgG opsonization of merozoites, and highlight recent developments that support a role for these functional antibodies in naturally acquired and vaccine-induced immunity.
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Affiliation(s)
- Danika L Hill
- Babraham Institute, Babraham Research Campus, Cambridge, United Kingdom; The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia.
| | - Louis Schofield
- Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, Australia
| | - Danny W Wilson
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, Australia; Burnet Institute, 85 Commercial Road, Melbourne 3004, Victoria, Australia.
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24
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Blundell PA, Le NPL, Allen J, Watanabe Y, Pleass RJ. Engineering the fragment crystallizable (Fc) region of human IgG1 multimers and monomers to fine-tune interactions with sialic acid-dependent receptors. J Biol Chem 2017; 292:12994-13007. [PMID: 28620050 PMCID: PMC5546038 DOI: 10.1074/jbc.m117.795047] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 06/12/2017] [Indexed: 12/24/2022] Open
Abstract
Multimeric fragment crystallizable (Fc) regions and Fc-fusion proteins are actively being explored as biomimetic replacements for IVIG therapy, which is deployed to manage many diseases and conditions but is expensive and not always efficient. The Fc region of human IgG1 (IgG1-Fc) can be engineered into multimeric structures (hexa-Fcs) that bind their cognate receptors with high avidity. The critical influence of the unique N-linked glycan attached at Asn-297 on the structure and function of IgG1-Fc is well documented; however, whether the N-linked glycan has a similarly critical role in multimeric, avidly binding Fcs, is unknown. Hexa-Fc contains two N-linked sites at Asn-77 (equivalent to Asn-297 in the Fc of IgG1) and Asn-236 (equivalent to Asn-563 in the tail piece of IgM). We report here that glycosylation at Asn-297 is critical for interactions with Fc receptors and complement and that glycosylation at Asn-563 is essential for controlling multimerization. We also found that introduction of an additional fully occupied N-linked glycosylation site at the N terminus at position 1 (equivalent to Asp-221 in the Fc of IgG1) dramatically enhances overall sialic acid content of the Fc multimers. Furthermore, replacement of Cys-575 in the IgM tail piece of multimers resulted in monomers with enhanced sialic acid content and differential receptor-binding profiles. Thus insertion of additional N-linked glycans into either the hinge or tail piece of monomers or multimers leads to molecules with enhanced sialylation that may be suitable for managing inflammation or blocking pathogen invasion.
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Affiliation(s)
- Patricia A Blundell
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, United Kingdom
| | - Ngoc Phuong Lan Le
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
| | - Joel Allen
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
| | - Yasunori Watanabe
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom
| | - Richard J Pleass
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, United Kingdom.
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25
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Glycan-independent binding and internalization of human IgM to FCMR, its cognate cellular receptor. Sci Rep 2017; 7:42989. [PMID: 28230186 PMCID: PMC5322398 DOI: 10.1038/srep42989] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 01/17/2017] [Indexed: 12/17/2022] Open
Abstract
IgM is the first antibody to be produced in immune responses and plays an important role in the neutralization of bacteria and viruses. Human IgM is heavily glycosylated, featuring five N-linked glycan sites on the μ chain and one on the J-chain. Glycosylation of IgG is known to modulate the effector functions of Fcγ receptors. In contrast, little is known about the effect of glycosylation on IgM binding to the human Fcμ receptor (hFCMR). In this study, we identify the Cμ4 domain of IgM as the target of hFCMR, and show that binding and internalization of IgM by hFCMR is glycan-independent. We generated a homology-based structure for hFCMR and used molecular dynamic simulations to show how this interaction with IgM may occur. Finally, we reveal an inhibitory function for IgM in the proliferation of T cells.
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26
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Bosques CJ, Manning AM. Fc-gamma receptors: Attractive targets for autoimmune drug discovery searching for intelligent therapeutic designs. Autoimmun Rev 2016; 15:1081-1088. [PMID: 27491569 DOI: 10.1016/j.autrev.2016.07.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 07/17/2016] [Indexed: 12/28/2022]
Abstract
Autoantibody immune complexes (ICs) mediate pathogenesis in multiple autoimmune diseases via direct interference with target function, complement fixation, and interaction with Fc-gamma receptors (FcγRs). Through high avidity interactions, ICs are able to crosslink low affinity FcγRs expressed on a wide variety of effector cells, leading to secretion of pro-inflammatory mediators and inducing cytotoxicity, ultimately resulting in tissue injury. Given their relevance in numerous autoimmune diseases, FcγRs have been considered as attractive therapeutic targets for the last three decades. However, a limited number of investigational drug candidates have been developed targeting FcγRs and only a few approved therapeutics have been associated with impacting FcγRs. This review provides a historical overview of the different therapeutic approaches used to target FcγRs for the treatment of autoimmune and inflammatory diseases.
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Affiliation(s)
- Carlos J Bosques
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Anthony M Manning
- Momenta Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA.
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27
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Moh ESX, Lin CH, Thaysen-Andersen M, Packer NH. Site-Specific N-Glycosylation of Recombinant Pentameric and Hexameric Human IgM. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1143-1155. [PMID: 27038031 DOI: 10.1007/s13361-016-1378-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 03/03/2016] [Accepted: 03/04/2016] [Indexed: 06/05/2023]
Abstract
Glycosylation is known to play an important role in IgG antibody structure and function. Polymeric IgM, the largest known antibody in humans, displays five potential N-glycosylation sites on each heavy chain monomer. IgM can exist as a pentamer with a connecting singly N-glycosylated J-chain (with a total of 51 glycosylation sites) or as a hexamer (60 glycosylation sites). In this study, the N-glycosylation of recombinant pentameric and hexameric IgM produced by the same human cell type and culture conditions was site-specifically profiled by RP-LC-CID/ETD-MS/MS using HILIC-enriched tryptic and GluC glycopeptides. The occupancy of all putative N-glycosylation sites on the pentameric and hexameric IgM were able to be determined. Distinct glycosylation differences were observed between each of the five N-linked sites on the IgM heavy chains. While Asn171, Asn332, and Asn395 all had predominantly complex type glycans, differences in glycan branching and sialylation were observed between the sites. Asn563, a high mannose-rich glycosylation site that locates in the center of the IgM polymer, was only approximately 60% occupied in both the pentameric and hexameric IgM forms, with a difference in relative abundance of the glycan structures between the pentamer and hexamer. This study highlights the information obtained by characterization of the site-heterogeneity of a highly glycosylated protein of high molecular mass with quaternary structure, revealing differences that would not be seen by global glycan or deglycosylated peptide profiling. Graphical Abstract ᅟ.
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Affiliation(s)
- Edward S X Moh
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Chi-Hung Lin
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
- ARC Centre of Excellence in Nanoscale BioPhotonics, Macquarie University, Sydney, NSW, 2109, Australia
| | - Morten Thaysen-Andersen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Nicolle H Packer
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia.
- ARC Centre of Excellence in Nanoscale BioPhotonics, Macquarie University, Sydney, NSW, 2109, Australia.
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28
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Nimmerjahn F. Immunomodulation of immunothrombocytopenia. Semin Hematol 2016; 53 Suppl 1:S10-2. [PMID: 27312154 DOI: 10.1053/j.seminhematol.2016.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Current treatment strategies in patients with immunothrombocytopenia (ITP) include immunosuppression and the stimulation of platelet production. Research over the last decade has emphasized the important role of Fc-receptors as key molecules responsible for autoantibody-mediated platelet depletion, allowing for a more specific targeting of this pathway instead of a generalized suppression of the immune system. This short review will discuss approaches aiming at interfering with key steps in this pathway, such as preventing the interaction of the platelet autoantibody immune complex with phagocytic cells, enhancing the clearance of autoantibodies, and interfering with or modulating the signaling pathways responsible for innate immune effector cell activation.
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Affiliation(s)
- Falk Nimmerjahn
- Institute of Genetics, Department of Biology, University of Erlangen-Nürnberg, Erlangen, Germany.
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29
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Sonneveld ME, Natunen S, Sainio S, Koeleman CAM, Holst S, Dekkers G, Koelewijn J, Partanen J, van der Schoot CE, Wuhrer M, Vidarsson G. Glycosylation pattern of anti-platelet IgG is stable during pregnancy and predicts clinical outcome in alloimmune thrombocytopenia. Br J Haematol 2016; 174:310-20. [PMID: 27017954 DOI: 10.1111/bjh.14053] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 01/26/2016] [Indexed: 12/16/2022]
Abstract
Fetal or neonatal alloimmune thrombocytopenia (FNAIT) is a potentially life-threatening disease where fetal platelets are destroyed by maternal anti-platelet IgG alloantibodies. The clinical outcome varies from asymptomatic, to petechiae or intracranial haemorrhage, but no marker has shown reliable correlation with severity, making screening for FNAIT impractical and highly inefficient. We recently found IgG Fc-glycosylation towards platelet and red blood cell antigens to be skewed towards decreased fucosylation, increased galactosylation and sialylation. The lowered core-fucosylation increases the affinity of the pathogenic antibodies to FcγRIIIa and FcγRIIIb, and hence platelet destruction. Here we analysed the N-linked glycans of human platelet antigen (HPA)-1a specific IgG1 with mass spectrometry in large series of FNAIT cases (n = 166) including longitudinal samples (n = 26). Besides a significant decrease in Fc-fucosylation after the first pregnancy (P = 0·0124), Fc-glycosylation levels remained stable during and after pregnancy and in subsequent pregnancies. Multiple logistic regression analysis identified anti-HPA-1a -fucosylation (P = 0·006) combined with galactosylation (P = 0·021) and antibody level (P = 0·038) correlated with bleeding severity, making these parameters a feasible marker in screening for severe cases of FNAIT.
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Affiliation(s)
- Myrthe E Sonneveld
- Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Suvi Natunen
- Finnish Red Cross Blood Service, Helsinki, Finland
| | | | - Carolien A M Koeleman
- Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Stephanie Holst
- Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Gillian Dekkers
- Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Joke Koelewijn
- Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | | | - C Ellen van der Schoot
- Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Manfred Wuhrer
- Centre for Proteomics and Metabolomics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Gestur Vidarsson
- Department of Experimental Immunohaematology, Sanquin Research and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
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Foss S, Grevys A, Sand KMK, Bern M, Blundell P, Michaelsen TE, Pleass RJ, Sandlie I, Andersen JT. Enhanced FcRn-dependent transepithelial delivery of IgG by Fc-engineering and polymerization. J Control Release 2015; 223:42-52. [PMID: 26718855 DOI: 10.1016/j.jconrel.2015.12.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 12/14/2015] [Accepted: 12/19/2015] [Indexed: 01/28/2023]
Abstract
Monoclonal IgG antibodies (Abs) are used extensively in the clinic to treat cancer and autoimmune diseases. In addition, therapeutic proteins are genetically fused to the constant Fc part of IgG. In both cases, the Fc secures a long serum half-life and favourable pharmacokinetics due to its pH-dependent interaction with the neonatal Fc receptor (FcRn). FcRn also mediates transport of intact IgG across polarized epithelial barriers, a pathway that is attractive for delivery of Fc-containing therapeutics. So far, no study has thoroughly compared side-by-side how IgG and different Fc-fusion formats are transported across human polarizing epithelial cells. Here, we used an in vitro cellular transport assay based on the human polarizing epithelial cell line (T84) in which both IgG1 and Fc-fusions were transported in an FcRn-dependent manner. Furthermore, we found that the efficacy of transport was dependent on the format. We demonstrate that transepithelial delivery could be enhanced by Fc-engineering for improved FcRn binding as well as by Fc-polymerization. In both cases, transport was driven by pH-dependent binding kinetics and the pH at the luminal side. Hence, efficient transcellular delivery of IgG-based drugs across human epithelial cells requires optimal pH-dependent FcRn binding that can be manipulated by avidity and Fc-engineering, factors that should inspire the design of future therapeutics targeted for transmucosal delivery.
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Affiliation(s)
- Stian Foss
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway
| | - Algirdas Grevys
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway
| | - Kine Marita Knudsen Sand
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway
| | - Malin Bern
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway
| | - Pat Blundell
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
| | - Terje E Michaelsen
- Department of Bacteriology and Immunology, Norwegian Institute of Public Health, Oslo, Norway; Department of Chemical Pharmacy, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Richard J Pleass
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
| | - Inger Sandlie
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway
| | - Jan Terje Andersen
- Centre for Immune Regulation (CIR), Department of Biosciences, University of Oslo, N-0316, Oslo, Norway; Department of Immunology and CIR, Oslo University Hospital, Rikshospitalet, University of Oslo, N-0372, Oslo, Norway.
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Pleass RJ, Moore SC, Stevenson L, Hviid L. Immunoglobulin M: Restrainer of Inflammation and Mediator of Immune Evasion by Plasmodium falciparum Malaria. Trends Parasitol 2015; 32:108-119. [PMID: 26597020 DOI: 10.1016/j.pt.2015.09.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/16/2015] [Accepted: 09/23/2015] [Indexed: 02/06/2023]
Abstract
Immunoglobulin M (IgM) is an ancient antibody class that is found in all vertebrates, with the exception of coelacanths, and is indispensable in both innate and adaptive immunity. The equally ancient human malaria parasite, Plasmodium falciparum, formed an intimate relationship with IgM with which it co-evolved. In this article, we discuss the association between IgM and human malaria parasites, building on several recent publications that implicate IgM as a crucial molecule that determines both host and parasite survival. Consequently, a better understanding of this association may lead to the development of improved intervention strategies.
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Affiliation(s)
- Richard J Pleass
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, UK.
| | - Shona C Moore
- Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, UK; Warwick Systems Biology Centre, Senate House, University of Warwick, Coventry, CV4 7AL, UK
| | - Liz Stevenson
- Centre for Medical Parasitology, Department of Immunology and Microbiology (ISIM), Faculty of Health and Medical Sciences, University of Copenhagen and Department of Infectious Diseases, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
| | - Lars Hviid
- Centre for Medical Parasitology, Department of Immunology and Microbiology (ISIM), Faculty of Health and Medical Sciences, University of Copenhagen and Department of Infectious Diseases, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark.
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