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Galaski J, Rishiq A, Liu M, Bsoul R, Bergson A, Lux R, Bachrach G, Mandelboim O. Fusobacterium nucleatum subsp. nucleatum RadD binds Siglec-7 and inhibits NK cell-mediated cancer cell killing. iScience 2024; 27:110157. [PMID: 38952680 PMCID: PMC11215305 DOI: 10.1016/j.isci.2024.110157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 04/23/2024] [Accepted: 05/28/2024] [Indexed: 07/03/2024] Open
Abstract
Fusobacterium nucleatum is an oral commensal bacterium that can colonize extraoral tumor entities, such as colorectal cancer and breast cancer. Recent studies revealed its ability to modulate the immune response in the tumor microenvironment (TME), promoting cancer progression and metastasis. Importantly, F. nucleatum subsp. animalis was shown to bind to Siglec-7 via lipopolysaccharides, leading to a pro-inflammatory profile in human monocyte-derived dendritic cells. In this study, we show that F. nucleatum subsp. nucleatum RadD binds to Siglec-7 on NK cells, thereby inhibiting NK cell-mediated cancer cell killing. We demonstrate that this binding is dependent on arginine residue R124 in Siglec-7. Finally, we determine that this binding is independent of the known interaction of RadD with IgA. Taken together, our findings elucidate the targeting of Siglec-7 by F. nucleatum subsp. nucleatum RadD as a means to modulate the NK cell response and potentially promoting immune evasion and tumor progression.
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Affiliation(s)
- Johanna Galaski
- The Concern Foundation Laboratories at the Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research, Institute for Medical Research Israel Canada (IMRIC), Faculty of Medicine, The Hebrew University Medical School, Jerusalem, Israel
- I. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Institute of Medical Microbiology and Hygiene, Medical Centre University of Freiburg, Freiburg, Germany
| | - Ahmed Rishiq
- The Concern Foundation Laboratories at the Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research, Institute for Medical Research Israel Canada (IMRIC), Faculty of Medicine, The Hebrew University Medical School, Jerusalem, Israel
| | - Mingdong Liu
- The Concern Foundation Laboratories at the Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research, Institute for Medical Research Israel Canada (IMRIC), Faculty of Medicine, The Hebrew University Medical School, Jerusalem, Israel
| | - Reem Bsoul
- The Institute of Dental Sciences, The Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel
| | - Almog Bergson
- The Concern Foundation Laboratories at the Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research, Institute for Medical Research Israel Canada (IMRIC), Faculty of Medicine, The Hebrew University Medical School, Jerusalem, Israel
| | - Renate Lux
- Section of Periodontics, Division of Constitutive & Regenerative Sciences, UCLA School of Dentistry, Los Angeles, CA 90095, USA
| | - Gilad Bachrach
- The Institute of Dental Sciences, The Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel
| | - Ofer Mandelboim
- The Concern Foundation Laboratories at the Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research, Institute for Medical Research Israel Canada (IMRIC), Faculty of Medicine, The Hebrew University Medical School, Jerusalem, Israel
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Díaz-García E, García-Sánchez A, Alfaro E, López-Fernández C, Mañas E, Cano-Pumarega I, López-Collazo E, García-Río F, Cubillos-Zapata C. PSGL-1: a novel immune checkpoint driving T-cell dysfunction in obstructive sleep apnea. Front Immunol 2023; 14:1277551. [PMID: 37854605 PMCID: PMC10579800 DOI: 10.3389/fimmu.2023.1277551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 09/12/2023] [Indexed: 10/20/2023] Open
Abstract
Introduction Although higher incidence of cancer represents a major burden for obstructive sleep apnea (OSA) patients, the molecular pathways driving this association are not completely understood. Recently, the adhesion receptor P-selectin glycoprotein-1 (PSGL 1) has been identified as a novel immune checkpoint, which are recognized major hallmarks in several types of cancer and have revolutionized cancer therapy. Methods The expression of PSGL-1 and its ligands VISTA and SIGLEC-5 was assessed in the leucocytes of OSA patients and control subjects exploring the role of intermittent hypoxia (IH) using in vitro models. In addition, PSGL-1 impact on T-cells function was evaluated by ex vivo models. Results Data showed PSGL-1 expression is upregulated in the T-lymphocytes from patients with severe OSA, indicating a relevant role of hypoxemia mediated by intermittent hypoxia. Besides, results suggest an inhibitory role of PSGL-1 on T-cell proliferation capacity. Finally, the expression of SIGLEC-5 but not VISTA was increased in monocytes from OSA patients, suggesting a regulatory role of intermittent hypoxia. Discussion In conclusion, PSGL-1 might constitute an additional immune checkpoint leading to T-cell dysfunction in OSA patients, contributing to the disruption of immune surveillance, which might provide biological plausibility to the higher incidence and aggressiveness of several tumors in these patients.
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Affiliation(s)
- Elena Díaz-García
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Respiratory Diseases Group, Respiratory Diseases Department, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
| | - Aldara García-Sánchez
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Servicio de Neumología, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | - Enrique Alfaro
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Respiratory Diseases Group, Respiratory Diseases Department, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
| | - Cristina López-Fernández
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Respiratory Diseases Group, Respiratory Diseases Department, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
| | - Eva Mañas
- Servicio de Neumología, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | | | - Eduardo López-Collazo
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- The Innate Immune Response Group, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
| | - Francisco García-Río
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Respiratory Diseases Group, Respiratory Diseases Department, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
- Faculty of Medicine, Autonomous University of Madrid, Madrid, Spain
| | - Carolina Cubillos-Zapata
- Biomedical Research Networking Centre on Respiratory Diseases (CIBERES), Madrid, Spain
- Respiratory Diseases Group, Respiratory Diseases Department, Hospital La Paz Institute for Health Research – IdiPAZ, Madrid, Spain
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Liu LZ, Liu L, Shi ZH, Bian XL, Si ZR, Wang QQ, Xiang Y, Zhang Y. Amphibian pore-forming protein βγ-CAT drives extracellular nutrient scavenging under cell nutrient deficiency. iScience 2023; 26:106598. [PMID: 37128610 PMCID: PMC10148134 DOI: 10.1016/j.isci.2023.106598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 02/22/2023] [Accepted: 03/30/2023] [Indexed: 05/03/2023] Open
Abstract
Nutrient acquisition is essential for animal cells. βγ-CAT is a pore-forming protein (PFP) and trefoil factor complex assembled under tight regulation identified in toad Bombina maxima. Here, we reported that B. maxima cells secreted βγ-CAT under glucose, glutamine, and pyruvate deficiency to scavenge extracellular proteins for their nutrient supply and survival. AMPK signaling positively regulated the expression and secretion of βγ-CAT. The PFP complex selectively bound extracellular proteins and promoted proteins uptake through endolysosomal pathways. Elevated intracellular amino acids, enhanced ATP production, and eventually prolonged cell survival were observed in the presence of βγ-CAT and extracellular proteins. Liposome assays indicated that high concentration of ATP negatively regulated the opening of βγ-CAT channels. Collectively, these results uncovered that βγ-CAT is an essential element in cell nutrient scavenging under cell nutrient deficiency by driving vesicular uptake of extracellular proteins, providing a new paradigm for PFPs in cell nutrient acquisition and metabolic flexibility.
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Affiliation(s)
- Ling-Zhen Liu
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, Yunnan 650204, China
| | - Long Liu
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- Human Aging Research Institute (HARI) and School of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Zhi-Hong Shi
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, Yunnan 650204, China
| | - Xian-Ling Bian
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- School of Life Science, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zi-Ru Si
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- School of Life Science, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qi-Quan Wang
- Human Aging Research Institute (HARI) and School of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Yang Xiang
- Human Aging Research Institute (HARI) and School of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
- Corresponding author
| | - Yun Zhang
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Engineering Laboratory of Peptides of the Chinese Academy of Sciences, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, Yunnan 650204, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, Yunnan 650201, China
- Corresponding author
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Córdova-Dávalos LE, Cervantes-García D, Ballona-Alba MF, Santos-López A, Esquivel-Basaldúa AS, Gallegos-Alcalá P, Jiménez M, Salinas E. Protective Effect of Glycomacropeptide on the Inflammatory Response of U937 Macrophages. Foods 2023; 12:foods12071528. [PMID: 37048349 PMCID: PMC10094090 DOI: 10.3390/foods12071528] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 03/30/2023] [Accepted: 03/31/2023] [Indexed: 04/07/2023] Open
Abstract
Macrophages play crucial roles in inflammation and oxidative stress associated with noncommunicable diseases, such as cardiovascular diseases, diabetes, and cancer. Glycomacropeptide (GMP) is a bioactive peptide derived from milk κ-casein that contains abundant sialic acid and has shown anti-inflammatory, antioxidative, anti-obesity, and anti-diabetic properties when is orally administered. The aim of this study was to evaluate the effect of GMP on the regulation of the inflammatory response in human macrophages and the participation of sialic acid in this activity. GMP pretreatment decreased by 35%, 35%, and 49% the production of nitrites, interleukin (IL)-1β, and tumor necrosis factor (TNF)-α, respectively, in activated human macrophages U937. The same effect was obtained when cells were pretreated with asialo GMP, and no change on the gene expression of the lectins associated with the recognition of sialic acids, SIGLEC5, 7, and 9, was induced by GMP on macrophages, which suggests that sialic acid might not be involved in this immunoregulatory effect. Interestingly, GMP increased 8.9- and 3.5-fold the gene expression of the canonical anti-inflammatory protein SOCS3 and the antioxidant enzyme HMOX1, respectively, in U937 cells. Thus, GMP exerts anti-inflammatory and antioxidative activities on activated macrophages in a sialic acid-independent manner, which might be related to its in vivo reported bioactivity.
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Affiliation(s)
- Laura Elena Córdova-Dávalos
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Daniel Cervantes-García
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
- National Council of Science and Technology, Av. de los Insurgentes Sur 1582, Crédito Constructor, Benito Juárez, Ciudad de México 03940, Mexico
| | - Maria Fernanda Ballona-Alba
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Alejandra Santos-López
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Alma Saraí Esquivel-Basaldúa
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Pamela Gallegos-Alcalá
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Mariela Jiménez
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
| | - Eva Salinas
- Laboratory of Immunology, Department of Microbiology, Center of Basic Science, Universidad Autónoma de Aguascalientes, Av. Universidad # 940, Aguascalientes 20100, Mexico
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Siddiqui SS. Non-canonical roles of Siglecs: Beyond sialic acid-binding and immune cell modulation. Mol Aspects Med 2023; 90:101145. [PMID: 36153172 DOI: 10.1016/j.mam.2022.101145] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 08/11/2022] [Accepted: 09/13/2022] [Indexed: 02/08/2023]
Abstract
Siglecs (Sialic acid-binding immunoglobulin-type lectins) are I-type lectins that bind with sialic acid ligands (Sia). Most are expressed on the surface of leukocytes and are involved in immune regulation and possess immune tyrosine-based inhibitory motif (ITIM) in the intracellular domain, thus leading to inhibition of the immune response. This signaling is instrumental in maintaining quiescence under physiological conditions and acts as a brake for inflammatory cascades. By contrast, activating Siglecs carry positively charged residues in the transmembrane domain and interact with immune tyrosine-based activating motif (ITAM)-containing proteins, a DNAX-activating protein of 10-12 kDa (DAP10/12), to activate immune cells. There are various characteristics of Siglecs that do not fit within the classification of Siglec receptors as being either inhibitory or activating in nature. This review focuses on elucidating the non-canonical functions and interactions of Siglec receptors, which include Sia-independent interactions such as protein-protein interactions and interactions with lipids or other sugars. This review also summarizes Siglec expression and function on non-immune cells, and non-classical signaling of the receptor. Thus, this review will be beneficial to researchers interested in the field of Siglecs and sialic acid biology.
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Affiliation(s)
- Shoib Sarwar Siddiqui
- School of Life and Medical Sciences, University of Hertfordshire, College Lane Campus, Hatfield, AL10 9AB, United Kingdom.
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Glycobiology of cellular expiry: Decrypting the role of glycan-lectin regulatory complex and therapeutic strategies focusing on cancer. Biochem Pharmacol 2023; 207:115367. [PMID: 36481348 DOI: 10.1016/j.bcp.2022.115367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/25/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Often the outer leaflets of living cells bear a coat of glycosylated proteins, which primarily regulates cellular processes. Glycosylation of such proteins occurs as part of their post-translational modification. Within the endoplasmic reticulum, glycosylation enables the attachment of specific oligosaccharide moieties such as, 'glycan' to the transmembrane receptor proteins which confers precise biological information for governing the cell fate. The nature and degree of glycosylation of cell surface receptors are regulated by a bunch of glycosyl transferases and glycosidases which fine-tune attachment or detachment of glycan moieties. In classical death receptors, upregulation of glycosylation by glycosyl transferases is capable of inducing cell death in T cells, tumor cells, etc. Thus, any deregulated alternation at surface glycosylation of these death receptors can result in life-threatening disorder like cancer. In addition, transmembrane glycoproteins and lectin receptors can transduce intracellular signals for cell death execution. Exogenous interaction of lectins with glycan containing death receptors signals for cell death initiation by modulating downstream signalings. Subsequently, endogenous glycan-lectin interplay aids in the customization and implementation of the cell death program. Lastly, the glycan-lectin recognition system dictates the removal of apoptotic cells by sending accurate signals to the extracellular milieu. Since glycosylation has proven to be a biomarker of cellular death and disease progression; glycans serve as specific therapeutic targets of cancers. In this context, we are reviewing the molecular mechanisms of the glycan-lectin regulatory network as an integral part of cell death machinery in cancer to target them for successful therapeutic and clinical approaches.
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Vuchkovska A, Glanville DG, Scurti GM, Nishimura MI, White P, Ulijasz AT, Iwashima M. Siglec-5 is an inhibitory immune checkpoint molecule for human T cells. Immunology 2022; 166:238-248. [PMID: 35290663 DOI: 10.1111/imm.13470] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/25/2022] [Accepted: 03/04/2022] [Indexed: 11/29/2022] Open
Abstract
Sialic acid-binding immunoglobulin-type lectins (Siglecs) are a family of immunoglobulin-type lectins that mediate protein-carbohydrate interactions via sialic acids attached to glycoproteins or glycolipids. Most of the CD33-related Siglecs (CD33rSiglecs), a major subfamily of rapidly evolving Siglecs, contain a cytoplasmic signaling domain consisting of the immunoreceptor tyrosine-based inhibitory motif (ITIM) and immunoreceptor tyrosine-based switch motif (ITSM) and mediate suppressive signals for lymphoid and myeloid cells. While most CD33rSiglecs are expressed by innate immune cells, such as monocytes and neutrophils, to date, the expression of Siglecs in human T cells has not been well appreciated. In this study, we found that Siglec-5, a member of the CD33rSiglecs, is expressed by most activated T cells upon antigen receptor stimulation. Functionally, Siglec-5 suppresses T cell activation. In support of these findings, we found that Siglec-5 overexpression abrogates antigen receptor induced activation of NFAT and AP-1. Furthermore, we show that GBS β-protein, a known bacterial ligand of Siglec-5, reduces the production of cytokines and cytolytic molecules by activated primary T cells in a Siglec-5 dependent manner. Our data also show that some cancer cell lines express a putative Siglec-5 ligand(s), and that the presence of soluble Siglec-5 enhances tumor-cell specific T cell activation, suggesting that some tumor cells inhibit T cell activation via Siglec-5. Together, our data demonstrate that Siglec-5 is a previously unrecognized inhibitory T cell immune checkpoint molecule and suggest that blockade of Siglec-5 could serve as a new strategy to enhance anti-tumor T cell functions.
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Affiliation(s)
- Aleksandra Vuchkovska
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA.,Van Kampen Cardiopulmonary Research Laboratory, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - David G Glanville
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - Gina M Scurti
- Department of Surgery, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - Michael I Nishimura
- Department of Surgery, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - Paula White
- Department of Gynecology and Obstetrics, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - Andrew T Ulijasz
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
| | - Makio Iwashima
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA.,Van Kampen Cardiopulmonary Research Laboratory, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, USA
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Xu X, Marffy ALL, Keightley A, McCarthy AJ, Geisbrecht BV. Group B Streptococcus Surface Protein β: Structural Characterization of a Complement Factor H-Binding Motif and Its Contribution to Immune Evasion. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 208:1232-1247. [PMID: 35110419 PMCID: PMC8881398 DOI: 10.4049/jimmunol.2101078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 12/10/2021] [Indexed: 11/19/2022]
Abstract
The β protein from group B Streptococcus (GBS) is a ∼132-kDa, cell-surface exposed molecule that binds to multiple host-derived ligands, including complement factor H (FH). Many details regarding this interaction and its significance to immune evasion by GBS remain unclear. In this study, we identified a three-helix bundle domain within the C-terminal half of the B75KN region of β as the major FH-binding determinant and determined its crystal structure at 2.5 Å resolution. Analysis of this structure suggested a role in FH binding for a loop region connecting helices α1 and α2, which we confirmed by mutagenesis and direct binding studies. Using a combination of protein cross-linking and mass spectrometry, we observed that B75KN bound to complement control protein (CCP)3 and CCP4 domains of FH. Although this binding site lies within a complement regulatory region of FH, we determined that FH bound by β retained its decay acceleration and cofactor activities. Heterologous expression of β by Lactococcus lactis resulted in recruitment of FH to the bacterial surface and a significant reduction of C3b deposition following exposure to human serum. Surprisingly, we found that FH binding by β was not required for bacterial resistance to phagocytosis by neutrophils or killing of bacteria by whole human blood. However, loss of the B75KN region significantly diminished bacterial survival in both assays. Although our results show that FH recruited to the bacterial surface through a high-affinity interaction maintains key complement-regulatory functions, they raise questions about the importance of FH binding to immune evasion by GBS as a whole.
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Affiliation(s)
- Xin Xu
- Department of Biochemistry & Molecular Biophysics, Kansas State University; Manhattan, KS U.S.A
| | - Alexander L. Lewis Marffy
- Department of Infectious Diseases, Section of Molecular Microbiology, MRC Centre for Molecular Bacteriology & Infection, Imperial College London; London, U.K
| | - Andrew Keightley
- Department of Opthamology, School of Medicine, University of Missouri-Kansas City; Kansas City, MO U.S.A
| | - Alex J. McCarthy
- Department of Infectious Diseases, Section of Molecular Microbiology, MRC Centre for Molecular Bacteriology & Infection, Imperial College London; London, U.K
| | - Brian V. Geisbrecht
- Department of Biochemistry & Molecular Biophysics, Kansas State University; Manhattan, KS U.S.A.,To whom correspondence should be addressed: Brian V. Geisbrecht, Ph.D., Kansas State University, 141 Chalmers Hall, 1711 Claflin Road, Manhattan, KS 66506, PH: 785.532.3154,
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van Sorge NM, Bonsor DA, Deng L, Lindahl E, Schmitt V, Lyndin M, Schmidt A, Nilsson OR, Brizuela J, Boero E, Sundberg EJ, van Strijp JAG, Doran KS, Singer BB, Lindahl G, McCarthy AJ. Bacterial protein domains with a novel Ig-like fold target human CEACAM receptors. EMBO J 2021; 40:e106103. [PMID: 33522633 PMCID: PMC8013792 DOI: 10.15252/embj.2020106103] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 12/08/2020] [Accepted: 12/10/2020] [Indexed: 01/19/2023] Open
Abstract
Streptococcus agalactiae, also known as group B Streptococcus (GBS), is the major cause of neonatal sepsis in humans. A critical step to infection is adhesion of bacteria to epithelial surfaces. GBS adhesins have been identified to bind extracellular matrix components and cellular receptors. However, several putative adhesins have no host binding partner characterised. We report here that surface-expressed β protein of GBS binds to human CEACAM1 and CEACAM5 receptors. A crystal structure of the complex showed that an IgSF domain in β represents a novel Ig-fold subtype called IgI3, in which unique features allow binding to CEACAM1. Bioinformatic assessment revealed that this newly identified IgI3 fold is not exclusively present in GBS but is predicted to be present in adhesins from other clinically important human pathogens. In agreement with this prediction, we found that CEACAM1 binds to an IgI3 domain found in an adhesin from a different streptococcal species. Overall, our results indicate that the IgI3 fold could provide a broadly applied mechanism for bacteria to target CEACAMs.
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Affiliation(s)
- Nina M van Sorge
- Department of Medical MicrobiologyUniversity Medical Center UtrechtUtrecht UniversityUtrechtThe Netherlands
- Present address:
Department of Medical Microbiology,Infection Prevention and Netherlands Reference Laboratory for Bacterial MeningitisAmsterdam University Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands
| | - Daniel A Bonsor
- Institute of Human VirologyUniversity of Maryland School of MedicineUniversity of MarylandBaltimoreMDUSA
| | - Liwen Deng
- Department of Immunology & MicrobiologyUniversity of Colorado Anschutz Medical CampusAuroraCOUSA
| | - Erik Lindahl
- Department of Biochemistry and BiophysicsScience for Life LaboratoryStockholm UniversityStockholmSweden
| | - Verena Schmitt
- Institute of AnatomyMedical Faculty, University Duisburg‐EssenEssenGermany
| | - Mykola Lyndin
- Institute of AnatomyMedical Faculty, University Duisburg‐EssenEssenGermany
- Department of PathologySumy State UniversitySumyUkraine
| | - Alexej Schmidt
- Department of Medical BiosciencesUmeå UniversityPathology, UmeåSweden
| | - Olof R Nilsson
- Department of Laboratory MedicineDivision of Medical MicrobiologyLund UniversityLundSweden
| | - Jaime Brizuela
- Department of Infectious Disease, MRC Centre for Molecular Bacteriology & InfectionImperial College LondonLondonUK
| | - Elena Boero
- Department of Medical MicrobiologyUniversity Medical Center UtrechtUtrecht UniversityUtrechtThe Netherlands
| | - Eric J Sundberg
- Institute of Human VirologyUniversity of Maryland School of MedicineUniversity of MarylandBaltimoreMDUSA
- Department of BiochemistryEmory University School of MedicineAtlantaGAUSA
| | - Jos A G van Strijp
- Department of Medical MicrobiologyUniversity Medical Center UtrechtUtrecht UniversityUtrechtThe Netherlands
| | - Kelly S Doran
- Department of Immunology & MicrobiologyUniversity of Colorado Anschutz Medical CampusAuroraCOUSA
| | - Bernhard B Singer
- Institute of AnatomyMedical Faculty, University Duisburg‐EssenEssenGermany
| | - Gunnar Lindahl
- Department of Laboratory MedicineDivision of Medical MicrobiologyLund UniversityLundSweden
- Department of ChemistryDivision of Applied MicrobiologyLund UniversityLundSweden
| | - Alex J McCarthy
- Department of Medical MicrobiologyUniversity Medical Center UtrechtUtrecht UniversityUtrechtThe Netherlands
- Department of Infectious Disease, MRC Centre for Molecular Bacteriology & InfectionImperial College LondonLondonUK
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Fong JJ, Tsai CM, Saha S, Nizet V, Varki A, Bui JD. Siglec-7 engagement by GBS β-protein suppresses pyroptotic cell death of natural killer cells. Proc Natl Acad Sci U S A 2018; 115:10410-10415. [PMID: 30254166 PMCID: PMC6187154 DOI: 10.1073/pnas.1804108115] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Natural killer (NK) cells are innate immune lymphocytes that recognize and destroy abnormal host cells, such as tumor cells or those infected by viral pathogens. To safely accomplish these functions, NK cells display activating receptors that detect stress molecules or viral ligands displayed at the cell surface, balanced by inhibitory receptors that bind to self-molecules. To date, such activating and inhibitory receptors on NK cells are not known to recognize bacterial determinants. Moreover, NK cell responses to direct interactions with extracellular bacteria are poorly explored. In this study, we observed the human neonatal pathogen group B Streptococcus (GBS) can directly engage human NK cells. The interaction was mediated through the B6N segment of streptococcal β-protein, binding to the inhibitory receptor Siglec-7 via its amino-terminal V-set domain. Unlike classical Siglec binding, the interaction is also independent of its sialic acid recognition property. In contrast to WT GBS, mutants lacking β-protein induced efficient pyroptosis of NK cells through the NLRP3 inflammasome, with production and secretion of the proinflammatory cytokine IL-1β and dissemination of the cytotoxic molecule granzyme B. We postulate that GBS evolved β-protein engagement of inhibitory human Siglec-7 to suppress the pyroptotic response of NK cells and thereby block recruitment of a broader innate immune response, i.e., by "silencing the sentinel."
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Affiliation(s)
- Jerry J Fong
- Glycobiology Research and Training Center, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Chih-Ming Tsai
- Glycobiology Research and Training Center, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Sudeshna Saha
- Glycobiology Research and Training Center, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Victor Nizet
- Glycobiology Research and Training Center, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Department of Pediatrics, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Skaggs School of Pharmacy and Pharmaceutical Sciences, School of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Ajit Varki
- Glycobiology Research and Training Center, School of Medicine, University of California, San Diego, La Jolla, CA 92093;
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093
- Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Jack D Bui
- Department of Pathology, School of Medicine, University of California, San Diego, La Jolla, CA 92093
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11
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Pietrocola G, Arciola CR, Rindi S, Montanaro L, Speziale P. Streptococcus agalactiae Non-Pilus, Cell Wall-Anchored Proteins: Involvement in Colonization and Pathogenesis and Potential as Vaccine Candidates. Front Immunol 2018; 9:602. [PMID: 29686667 PMCID: PMC5900788 DOI: 10.3389/fimmu.2018.00602] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 03/09/2018] [Indexed: 11/13/2022] Open
Abstract
Group B Streptococcus (GBS) remains an important etiological agent of several infectious diseases including neonatal septicemia, pneumonia, meningitis, and orthopedic device infections. This pathogenicity is due to a variety of virulence factors expressed by Streptococcus agalactiae. Single virulence factors are not sufficient to provoke a streptococcal infection, which is instead promoted by the coordinated activity of several pathogenicity factors. Such determinants, mostly cell wall-associated and secreted proteins, include adhesins that mediate binding of the pathogen to host extracellular matrix/plasma ligands and cell surfaces, proteins that cooperate in the invasion of and survival within host cells and factors that neutralize phagocytosis and/or modulate the immune response. The genome-based approaches and bioinformatics tools and the extensive use of biophysical and biochemical methods and animal model studies have provided a great wealth of information on the molecular structure and function of these virulence factors. In fact, a number of new GBS surface-exposed or secreted proteins have been identified (GBS immunogenic bacterial adhesion protein, leucine-rich repeat of GBS, serine-rich repeat proteins), the three-dimensional structures of known streptococcal proteins (αC protein, C5a peptidase) have been solved and an understanding of the pathogenetic role of "old" and new determinants has been better defined in recent years. Herein, we provide an update of our current understanding of the major surface cell wall-anchored proteins from GBS, with emphasis on their biochemical and structural properties and the pathogenetic roles they may have in the onset and progression of host infection. We also focus on the antigenic profile of these compounds and discuss them as targets for therapeutic intervention.
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Affiliation(s)
- Giampiero Pietrocola
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Carla Renata Arciola
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy.,Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Simonetta Rindi
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Lucio Montanaro
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy.,Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Pietro Speziale
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy.,Department of Industrial and Information Engineering, University of Pavia, Pavia, Italy
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12
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Vornhagen J, Adams Waldorf KM, Rajagopal L. Perinatal Group B Streptococcal Infections: Virulence Factors, Immunity, and Prevention Strategies. Trends Microbiol 2017. [PMID: 28633864 DOI: 10.1016/j.tim.2017.05.013] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Group B streptococcus (GBS) or Streptococcus agalactiae is a β-hemolytic, Gram-positive bacterium that is a leading cause of neonatal infections. GBS commonly colonizes the lower gastrointestinal and genital tracts and, during pregnancy, neonates are at risk of infection. Although intrapartum antibiotic prophylaxis during labor and delivery has decreased the incidence of early-onset neonatal infection, these measures do not prevent ascending infection that can occur earlier in pregnancy leading to preterm births, stillbirths, or late-onset neonatal infections. Prevention of GBS infection in pregnancy is complex and is likely influenced by multiple factors, including pathogenicity, host factors, vaginal microbiome, false-negative screening, and/or changes in antibiotic resistance. A deeper understanding of the mechanisms of GBS infections during pregnancy will facilitate the development of novel therapeutics and vaccines. Here, we summarize and discuss important advancements in our understanding of GBS vaginal colonization, ascending infection, and preterm birth.
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Affiliation(s)
- Jay Vornhagen
- Department of Global Health, University of Washington, Seattle, WA, USA; Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Kristina M Adams Waldorf
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA; Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
| | - Lakshmi Rajagopal
- Department of Global Health, University of Washington, Seattle, WA, USA; Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA, USA; Department of Pediatrics, University of Washington, Seattle, WA, USA.
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13
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Dong J, Wei Y, Ye X, Sun C, Tian Y, Lu M, Du J, Chen Z. Discovery and expression of 3 siglecs-like in Oreochromis niloticus neutrophil, and their interaction with group B streptococcal sialylated capsular polysaccharides. Mol Immunol 2016; 73:158-69. [DOI: 10.1016/j.molimm.2016.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/19/2016] [Accepted: 01/20/2016] [Indexed: 11/30/2022]
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14
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Fong JJ, Sreedhara K, Deng L, Varki NM, Angata T, Liu Q, Nizet V, Varki A. Immunomodulatory activity of extracellular Hsp70 mediated via paired receptors Siglec-5 and Siglec-14. EMBO J 2015; 34:2775-88. [PMID: 26459514 DOI: 10.15252/embj.201591407] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 09/18/2015] [Indexed: 12/16/2022] Open
Abstract
The intracellular chaperone heat-shock protein 70 (Hsp70) can be secreted from cells, but its extracellular role is unclear, as the protein has been reported to both activate and suppress the innate immune response. Potential immunomodulatory receptors on myelomonocytic lineage cells that bind extracellular Hsp70 are not well defined. Siglecs are Ig-superfamily lectins on mammalian leukocytes that recognize sialic acid-bearing glycans and thereby modulate immune responses. Siglec-5 and Siglec-14, expressed on monocytes and neutrophils, share identical ligand-binding domains but have opposing signaling functions. Based on phylogenetic analyses of these receptors, we predicted that endogenous sialic acid-independent ligands should exist. An unbiased screen revealed Hsp70 as a ligand for Siglec-5 and Siglec-14. Hsp70 stimulation through Siglec-5 delivers an anti-inflammatory signal, while stimulation through Siglec-14 is pro-inflammatory. The functional consequences of this interaction are also addressed in relation to a SIGLEC14 polymorphism found in humans. Our results demonstrate that an endogenous non-sialic acid-bearing molecule can be either a danger-associated or self-associated signal through paired Siglecs, and may explain seemingly contradictory prior reports on extracellular Hsp70 action.
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Affiliation(s)
- Jerry J Fong
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Cellular and Molecular Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
| | - Karthik Sreedhara
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Cellular and Molecular Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
| | - Liwen Deng
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Pathology, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
| | - Nissi M Varki
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Pathology, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
| | - Takashi Angata
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Qinglian Liu
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, VA, USA
| | - Victor Nizet
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Pediatrics, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA UC San Diego School of Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
| | - Ajit Varki
- Glycobiology Research and Training Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Cellular and Molecular Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Department of Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA UC San Diego School of Medicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA
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15
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Vasilyeva A, Santos Sanches I, Florindo C, Dmitriev A. Natural Mutations in Streptococcus agalactiae Resulting in Abrogation of β Antigen Production. PLoS One 2015; 10:e0128426. [PMID: 26047354 PMCID: PMC4457541 DOI: 10.1371/journal.pone.0128426] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 04/27/2015] [Indexed: 11/18/2022] Open
Abstract
Streptococcus agalactiae genome encodes 21 two-component systems (TCS) and a variety of regulatory proteins in order to control gene expression. One of the TCS, BgrRS, comprising the BgrR DNA-binding regulatory protein and BgrS sensor histidine kinase, was discovered within a putative virulence island. BgrRS influences cell metabolism and positively control the expression of bac gene, coding for β antigen at transcriptional level. Inactivation of bgrR abrogated bac gene expression and increased virulence properties of S. agalactiae. In this study, a total of 140 strains were screened for the presence of bac gene, and the TCS bgrR and bgrS genes. A total of 53 strains carried the bac, bgrR and bgrS genes. Most of them (48 strains) expressed β antigen, while five strains did not express β antigen. Three strains, in which bac gene sequence was intact, while bgrR and/or bgrS genes had mutations, and expression of β antigen was absent, were complemented with a constructed plasmid pBgrRS(P) encoding functionally active bgrR and bgrS gene alleles. This procedure restored expression of β antigen indicating the crucial regulatory role of TCS BgrRS. The complemented strain A49V/BgrRS demonstrated attenuated virulence in intraperitoneal mice model of S. agalactiae infection compared to parental strain A49V. In conclusion we showed that disruption of β antigen expression is associated with: i) insertion of ISSa4 upstream the bac gene just after the ribosomal binding site; ii) point mutation G342A resulting a stop codon TGA within the bac gene and a truncated form of β antigen; iii) single deletion (G) in position 439 of the bgrR gene resulting in a frameshift and the loss of DNA-binding domain of the BgrR protein, and iv) single base substitutions in bgrR and bgrS genes causing single amino acid substitutions in BgrR (Arg187Lys) and BgrS (Arg252Gln). The fact that BgrRS negatively controls virulent properties of S. agalactiae gives a novel clue for understanding of S. agalactiae adaptation to the human.
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Affiliation(s)
- Anastasia Vasilyeva
- Department of Molecular Microbiology, Institute of Experimental Medicine, Saint-Petersburg, Russia
| | - Ilda Santos Sanches
- Department of Life Sciences, Centro de Recursos Microbiológicos (CREM) and Research Unit on Applied Molecular Biosciences (UCIBIO, REQUIMTE), Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
- * E-mail:
| | - Carlos Florindo
- Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - Alexander Dmitriev
- Department of Molecular Microbiology, Institute of Experimental Medicine, Saint-Petersburg, Russia
- Department of Fundamental Problems of Medicine and Medical Technologies, Saint-Petersburg State University, Saint-Petersburg, Russia
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16
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Abstract
Siglecs are mammalian sialic acid (Sia) recognizing immunoglobulin-like receptors expressed across the major leukocyte lineages, and function to recognize ubiquitous Sia epitopes on cell surface glycoconjugates and regulate immunological and inflammatory activities of these cells. A large subset referred to as CD33-related Siglecs are inhibitory receptors that limit leukocyte activation, and recent research has shown that the pathogen group B Streptococcus (GBS) binds to these Siglecs in Sia- and protein-dependent fashion to downregulate leukocyte bactericidal capacity. Conversely, sialoadhesin is a macrophage phagocytic receptor that engages GBS and other sialylated pathogens to promote effective phagocytosis and antigen presentation for the adaptive immune response. A variety of other important Siglec interactions with bacterial, viral and protozoan pathogens are beginning to be recognized. Siglec genes and binding specificities are rapidly evolving among primates, with key extant polymorphisms in human populations that may influence susceptibility to infection-associated disorders including chronic obstructive pulmonary disease and premature birth. This review summarizes current understanding of interactions between pathogens and Siglecs, a field of investigation that is likely to continue expanding in scope and medical importance.
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Affiliation(s)
- Yung-Chi Chang
- Glycobiology Research and Training Center Department of Pediatrics
| | - Victor Nizet
- Glycobiology Research and Training Center Department of Pediatrics Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093, USA
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17
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Schmitt R, Ståhl AL, Olin AI, Kristoffersson AC, Rebetz J, Novak J, Lindahl G, Karpman D. The combined role of galactose-deficient IgA1 and streptococcal IgA-binding M Protein in inducing IL-6 and C3 secretion from human mesangial cells: implications for IgA nephropathy. THE JOURNAL OF IMMUNOLOGY 2014; 193:317-26. [PMID: 24850720 DOI: 10.4049/jimmunol.1302249] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
IgA nephropathy (IgAN) is characterized by mesangial cell proliferation and extracellular matrix expansion associated with immune deposits consisting of galactose-deficient polymeric IgA1 and C3. We have previously shown that IgA-binding regions of streptococcal M proteins colocalize with IgA in mesangial immune deposits in patients with IgAN. In the present study, the IgA-binding M4 protein from group A Streptococcus was found to bind to galactose-deficient polymeric IgA1 with higher affinity than to other forms of IgA1, as shown by surface plasmon resonance and solid-phase immunoassay. The M4 protein was demonstrated to bind to mesangial cells not via the IgA-binding region but rather via the C-terminal region, as demonstrated by flow cytometry. IgA1 enhanced binding of M4 to mesangial cells, but not vice versa. Costimulation of human mesangial cells with M4 and galactose-deficient polymeric IgA1 resulted in a significant increase in IL-6 secretion compared with each stimulant alone. Galactose-deficient polymeric IgA1 alone, but not M4, induced C3 secretion from the cells, and costimulation enhanced this effect. Additionally, costimulation enhanced mesangial cell proliferation compared with each stimulant alone. These results indicate that IgA-binding M4 protein binds preferentially to galactose-deficient polymeric IgA1 and that these proteins together induce excessive proinflammatory responses and proliferation of human mesangial cells. Thus, tissue deposition of streptococcal IgA-binding M proteins may contribute to the pathogenesis of IgAN.
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Affiliation(s)
- Roland Schmitt
- Department of Pediatrics, Clinical Sciences Lund, Lund University, 22185 Lund, Sweden
| | - Anne-Lie Ståhl
- Department of Pediatrics, Clinical Sciences Lund, Lund University, 22185 Lund, Sweden
| | - Anders I Olin
- Department of Infection Medicine, Clinical Sciences Lund, Lund University, 22185 Lund, Sweden
| | | | - Johan Rebetz
- Department of Pediatrics, Clinical Sciences Lund, Lund University, 22185 Lund, Sweden
| | - Jan Novak
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294; and
| | - Gunnar Lindahl
- Division of Medical Microbiology, Department of Laboratory Medicine, Lund University, 22362 Lund, Sweden
| | - Diana Karpman
- Department of Pediatrics, Clinical Sciences Lund, Lund University, 22185 Lund, Sweden;
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18
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Ali SR, Fong JJ, Carlin AF, Busch TD, Linden R, Angata T, Areschoug T, Parast M, Varki N, Murray J, Nizet V, Varki A. Siglec-5 and Siglec-14 are polymorphic paired receptors that modulate neutrophil and amnion signaling responses to group B Streptococcus. ACTA ACUST UNITED AC 2014; 211:1231-42. [PMID: 24799499 PMCID: PMC4042635 DOI: 10.1084/jem.20131853] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Siglec-5 and Siglec-14 are shown to be paired inhibitory/activating receptors expressed on neutrophils and amniotic epithelium and modulating immune responses to group B Streptococcus. Group B Streptococcus (GBS) causes invasive infections in human newborns. We recently showed that the GBS β-protein attenuates innate immune responses by binding to sialic acid–binding immunoglobulin-like lectin 5 (Siglec-5), an inhibitory receptor on phagocytes. Interestingly, neutrophils and monocytes also express Siglec-14, which has a ligand-binding domain almost identical to Siglec-5 but signals via an activating motif, raising the possibility that these are paired Siglec receptors that balance immune responses to pathogens. Here we show that β-protein–expressing GBS binds to both Siglec-5 and Siglec-14 on neutrophils and that the latter engagement counteracts pathogen-induced host immune suppression by activating p38 mitogen-activated protein kinase (MAPK) and AKT signaling pathways. Siglec-14 is absent from some humans because of a SIGLEC14-null polymorphism, and homozygous SIGLEC14-null neutrophils are more susceptible to GBS immune subversion. Finally, we report an unexpected human-specific expression of Siglec-5 and Siglec-14 on amniotic epithelium, the site of initial contact of invading GBS with the fetus. GBS amnion immune activation was likewise influenced by the SIGLEC14-null polymorphism. We provide initial evidence that the polymorphism could influence the risk of prematurity among human fetuses of mothers colonized with GBS. This first functionally proven example of a paired receptor system in the Siglec family has multiple implications for regulation of host immunity.
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Affiliation(s)
- Syed Raza Ali
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Jerry J Fong
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Aaron F Carlin
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Tamara D Busch
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA 52242
| | - Rebecka Linden
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Takashi Angata
- Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Thomas Areschoug
- Division of Medical Microbiology, Lund University, SE-223 62 Lund, Sweden
| | - Mana Parast
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Nissi Varki
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Jeffrey Murray
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA 52242
| | - Victor Nizet
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
| | - Ajit Varki
- Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093Glycobiology Research and Training Center, Department of Cellular and Molecular Medicine, Department of Pediatrics, Department of Pathology, Department of Medicine, and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093
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19
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Barb AW, Wang X, Prestegard JH. Refolded recombinant Siglec5 for NMR investigation of complex carbohydrate binding. Protein Expr Purif 2013; 88:183-9. [PMID: 23321067 PMCID: PMC3593816 DOI: 10.1016/j.pep.2013.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 01/02/2013] [Accepted: 01/03/2013] [Indexed: 11/26/2022]
Abstract
Sialic-acid-binding immunoglobulin-like lectin (Siglec5) is a carbohydrate-binding surface receptor expressed on neutrophils, monocytes and B cells in human lymphoid and myeloid cell lineages. Existing structural and functional data fail to define the clear ligand specificity of Siglec5, though like other Siglec family members, it binds a variety of complex carbohydrates containing a sialic acid at the non-reducing terminus. Prokaryotic expression of this protein has proven challenging due to disulfide bonds and Asn-linked glycosylation. We developed an expression and purification protocol that uses an on-column strategy to refold Escherichia coli expressed protein that produced a high yield (2 mg/L) of the single N-terminal Siglec5 carbohydrate recognition domain (CRD). A 2D heteronuclear single-quantum coherence (HSQC) nuclear magnetic resonance (NMR) spectrum showed this material was folded, and a secondary structure prediction based on the assigned chemical shifts of backbone atoms was consistent with a previously determined X-ray model. NMR chemical shift mapping of Siglec5 binding to three carbohydrate ligands revealed similarities in binding interfaces and affinities. In addition, the role of alternate protein conformations identified by NMR in ligand binding is discussed. These studies demonstrate the Siglec5 CRD alone is sufficient for binding sialylated carbohydrates and provide a foundation for further investigation of Siglec5 structure and function.
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MESH Headings
- Amino Acid Sequence
- Antigens, CD/chemistry
- Antigens, CD/genetics
- Antigens, CD/isolation & purification
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/chemistry
- Antigens, Differentiation, Myelomonocytic/genetics
- Antigens, Differentiation, Myelomonocytic/isolation & purification
- Antigens, Differentiation, Myelomonocytic/metabolism
- Binding Sites
- DNA/genetics
- Escherichia coli/genetics
- Gene Expression
- Humans
- Lectins/chemistry
- Lectins/genetics
- Lectins/isolation & purification
- Lectins/metabolism
- Molecular Sequence Data
- Nuclear Magnetic Resonance, Biomolecular
- Protein Binding
- Protein Refolding
- Protein Structure, Tertiary
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Recombinant Proteins/isolation & purification
- Recombinant Proteins/metabolism
- Sialic Acids/metabolism
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Affiliation(s)
| | | | - James H. Prestegard
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602
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20
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Akkaya M, Barclay AN. How do pathogens drive the evolution of paired receptors? Eur J Immunol 2013; 43:303-13. [DOI: 10.1002/eji.201242896] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 11/06/2012] [Accepted: 12/18/2012] [Indexed: 11/12/2022]
Affiliation(s)
- Munir Akkaya
- Sir William Dunn School of Pathology; University of Oxford; Oxford United Kingdom
| | - A. Neil Barclay
- Sir William Dunn School of Pathology; University of Oxford; Oxford United Kingdom
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