51
|
Abstract
OBJECTIVE The objective of this study was to illustrate the prognostic value of diversified galectins in patients with hepatic cancer via meta-analysis. METHODS We conducted a systematic search on PubMed, Embase, The Cochrane Library, Web of Science, the Chinese National Knowledge Infrastructure (CNKI) database, and Wanfang Data for studies that reported associations between galectin expression and the prognosis for hepatic cancer patients, from the inception of each database to March 20, 2019. The combined hazard ratio (HR) and 95% confidence interval (CI) were estimated to investigate the prognosis. RESULTS We collected 11 studies of 1957 patients in our meta-analysis. The pooled results indicated that overall galectin expression was not correlated with OS (HR = 1.23, 95% CI = 0.84-1.79, P = .29) or DFS/RFS (HR = 0.808, 95% CI = 0.376-1.735, P = .42) in liver cancer patients. In stratified analyses, we observed that high galectin-1 and galectin-3 expression was significantly associated with poor OS. The pooled HR of galectin-4 and galectin-9 was correlated with improved OS. CONCLUSION Our results indicate that the high expression of galectin-1 and -3 and the low expression of galectin-4 and -9 may be predictive prognostic factors for poor OS in liver cancer patients.
Collapse
Affiliation(s)
- Qi Shao
- Department of Chemotherapy, Affiliated Hospital of Nantong University, Nantong
- The Third Affiliated Hospital of Soochow University, Changzhou
| | - Jing He
- Department of Chemotherapy, Affiliated Hospital of Nantong University, Nantong
| | - Zhiming Chen
- Department of Radiotherapy, Affiliated Hospital of Nantong University, Nantong
| | - Changping Wu
- Department of Tumor Biological Treatment, The Third Affiliated Hospital of Soochow University, Changzhou
- Department of Oncology, The Third Affiliated Hospital of Soochow University, Changzhou, Jiangsu, China
| |
Collapse
|
52
|
de Haas P, Hendriks WJAJ, Lefeber DJ, Cambi A. Biological and Technical Challenges in Unraveling the Role of N-Glycans in Immune Receptor Regulation. Front Chem 2020; 8:55. [PMID: 32117881 PMCID: PMC7013033 DOI: 10.3389/fchem.2020.00055] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 01/17/2020] [Indexed: 12/15/2022] Open
Abstract
N-glycosylation of membrane receptors is important for a wide variety of cellular processes. In the immune system, loss or alteration of receptor glycosylation can affect pathogen recognition, cell-cell interaction, and activation as well as migration. This is not only due to aberrant folding of the receptor, but also to altered lateral mobility or aggregation capacity. Despite increasing evidence of their biological relevance, glycosylation-dependent mechanisms of receptor regulation are hard to dissect at the molecular level. This is due to the intrinsic complexity of the glycosylation process and high diversity of glycan structures combined with the technical limitations of the current experimental tools. It is still challenging to precisely determine the localization and site-occupancy of glycosylation sites, glycan micro- and macro-heterogeneity at the individual receptor level as well as the biological function and specific interactome of receptor glycoforms. In addition, the tools available to manipulate N-glycans of a specific receptor are limited. Significant progress has however been made thanks to innovative approaches such as glycoproteomics, metabolic engineering, or chemoenzymatic labeling. By discussing examples of immune receptors involved in pathogen recognition, migration, antigen presentation, and cell signaling, this Mini Review will focus on the biological importance of N-glycosylation for receptor functions and highlight the technical challenges for examination and manipulation of receptor N-glycans.
Collapse
Affiliation(s)
- Paola de Haas
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Wiljan J A J Hendriks
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Dirk J Lefeber
- Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands.,Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, Netherlands
| | - Alessandra Cambi
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| |
Collapse
|
53
|
Chen HY, Wu YF, Chou FC, Wu YH, Yeh LT, Lin KI, Liu FT, Sytwu HK. Intracellular Galectin-9 Enhances Proximal TCR Signaling and Potentiates Autoimmune Diseases. THE JOURNAL OF IMMUNOLOGY 2020; 204:1158-1172. [PMID: 31969388 DOI: 10.4049/jimmunol.1901114] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 12/18/2019] [Indexed: 12/19/2022]
Abstract
Galectin-9 is a risk gene in inflammatory bowel disease. By transcriptomic analyses of ileal biopsies and PBMCs from inflammatory bowel disease patients, we identified a positive correlation between galectin-9 expression and colitis severity. We observed that galectin-9-deficient T cells were less able to induce T cell-mediated colitis. However, several mouse-based studies reported that galectin-9 treatment induces T cell apoptosis and ameliorates autoimmune diseases in an exogenously modulated manner, indicating a complicated regulation of galectin-9 in T cells. We found that galectin-9 is expressed mainly inside T cells, and its secreted form is barely detected under physiological conditions. Endogenous galectin-9 was recruited to immune synapses upon T cell activation. Moreover, proximal TCR signaling was impaired in galectin-9-deficient T cells, and proliferation of these cells was decreased through an intracellularly modulated manner. Th17 cell differentiation was downregulated in galectin-9-deficient T cells, and this impairment can be rescued by strong TCR signaling. Taken together, these findings suggest that intracellular galectin-9 is a positive regulator of T cell activation and modulates the pathogenesis of autoimmune diseases.
Collapse
Affiliation(s)
- Heng-Yi Chen
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 114, Taiwan.,National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli 350, Taiwan
| | - Yen-Fei Wu
- Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Feng-Cheng Chou
- Department and Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 114, Taiwan.,Laboratory of Translational Medicine Office, Development Center for Biotechnology, Taipei 115, Taiwan
| | - Yu-Hsuan Wu
- School of Medicine, National Defense Medical Center, Taipei 114, Taiwan; and
| | - Li-Tzu Yeh
- Department and Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 114, Taiwan
| | - Kuo-I Lin
- Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Fu-Tong Liu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan
| | - Huey-Kang Sytwu
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 114, Taiwan; .,National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli 350, Taiwan.,Department and Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 114, Taiwan
| |
Collapse
|
54
|
Galectin-8 Favors the Presentation of Surface-Tethered Antigens by Stabilizing the B Cell Immune Synapse. Cell Rep 2019; 25:3110-3122.e6. [PMID: 30540943 PMCID: PMC6302547 DOI: 10.1016/j.celrep.2018.11.052] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 10/03/2018] [Accepted: 11/13/2018] [Indexed: 11/21/2022] Open
Abstract
Complete activation of B cells relies on their capacity to extract tethered antigens from immune synapses by either exerting mechanical forces or promoting their proteolytic degradation through lysosome secretion. Whether antigen extraction can also be tuned by local cues originating from the lymphoid microenvironment has not been investigated. We here show that the expression of Galectin-8-a glycan-binding protein found in the extracellular milieu, which regulates interactions between cells and matrix proteins-is increased within lymph nodes under inflammatory conditions where it enhances B cell arrest phases upon antigen recognition in vivo and promotes synapse formation during BCR recognition of immobilized antigens. Galectin-8 triggers a faster recruitment and secretion of lysosomes toward the B cell-antigen contact site, resulting in efficient extraction of immobilized antigens through a proteolytic mechanism. Thus, extracellular cues can determine how B cells sense and extract tethered antigens and thereby tune B cell responses in vivo.
Collapse
|
55
|
Querol Cano L, Tagit O, Dolen Y, van Duffelen A, Dieltjes S, Buschow SI, Niki T, Hirashima M, Joosten B, van den Dries K, Cambi A, Figdor CG, van Spriel AB. Intracellular Galectin-9 Controls Dendritic Cell Function by Maintaining Plasma Membrane Rigidity. iScience 2019; 22:240-255. [PMID: 31786520 PMCID: PMC6906692 DOI: 10.1016/j.isci.2019.11.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 10/17/2019] [Accepted: 11/11/2019] [Indexed: 12/24/2022] Open
Abstract
Endogenous extracellular Galectins constitute a novel mechanism of membrane protein organization at the cell surface. Although Galectins are also highly expressed intracellularly, their cytosolic functions are poorly understood. Here, we investigated the role of Galectin-9 in dendritic cell (DC) surface organization and function. By combining functional, super-resolution and atomic force microscopy experiments to analyze membrane stiffness, we identified intracellular Galectin-9 to be indispensable for plasma membrane integrity and structure in DCs. Galectin-9 knockdown studies revealed intracellular Galectin-9 to directly control cortical membrane structure by modulating Rac1 activity, providing the underlying mechanism of Galectin-9-dependent actin cytoskeleton organization. Consequent to its role in maintaining plasma membrane structure, phagocytosis studies revealed that Galectin-9 was essential for C-type-lectin receptor-mediated pathogen uptake by DCs. This was confirmed by the impaired phagocytic capacity of Galectin-9-null murine DCs. Together, this study demonstrates a novel role for intracellular Galectin-9 in modulating DC function, which may be evolutionarily conserved.
Collapse
Affiliation(s)
- Laia Querol Cano
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Oya Tagit
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Yusuf Dolen
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Anne van Duffelen
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Shannon Dieltjes
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Sonja I Buschow
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Wytemaweg 80, Rotterdam 3015 CN, The Netherlands
| | - Toshiro Niki
- GalPharma Co., Ltd., Takamatsu, Kagawa 761-0301, Japan; Department of Immunology and Immunopathology, Faculty of Medicine, Kagawa University, Takamatsu, Kagawa, 761-0793, Japan
| | - Mitsuomi Hirashima
- GalPharma Co., Ltd., Takamatsu, Kagawa 761-0301, Japan; Department of Immunology and Immunopathology, Faculty of Medicine, Kagawa University, Takamatsu, Kagawa, 761-0793, Japan
| | - Ben Joosten
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, 6525 GA Nijmegen, The Netherlands
| | - Koen van den Dries
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, 6525 GA Nijmegen, The Netherlands
| | - Alessandra Cambi
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, 6525 GA Nijmegen, The Netherlands
| | - Carl G Figdor
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands
| | - Annemiek B van Spriel
- Department of Tumour Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26-28, Nijmegen 6525 GA, The Netherlands.
| |
Collapse
|
56
|
Enterina JR, Jung J, Macauley MS. Coordinated roles for glycans in regulating the inhibitory function of CD22 on B cells. Biomed J 2019; 42:218-232. [PMID: 31627864 PMCID: PMC6818156 DOI: 10.1016/j.bj.2019.07.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/19/2019] [Accepted: 07/26/2019] [Indexed: 01/17/2023] Open
Abstract
CD22 is an inhibitory B cell co-receptor that recognizes sialic acid-containing glycoconjugates as ligands. Interactions with its glycan ligands are key to regulating the ability of CD22 to modulate B cell function, the most widely explored of which is antagonizing B cell receptor (BCR) signaling. Most importantly, interactions of CD22 with ligands on the same cell (cis) control the organization of CD22 on the cell surface, which minimizes co-localization with the BCR. In contrast with the modest ability of CD22 to intrinsically dampen BCR signaling, glycan ligands presented on another cell (trans) along with an antigen drawn CD22 and the BCR together within an immunological synapse, strongly inhibiting BCR signaling. New concepts are emerging for how CD22 controls B cell function, such as changes in glycosylation at different stages of B cell differentiation, specifically on GC B cells. Related to these changes, new players, such galectin-9, have been discovered that regulate cell surface nanoclusters of CD22. Roles of glycan ligands in controlling CD22 are the primary focus of this review as we highlight the ability of CD22 to modulate B cell function.
Collapse
Affiliation(s)
- Jhon R Enterina
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada
| | - Jaesoo Jung
- Department of Chemistry, University of Alberta, Edmonton, Canada
| | - Matthew S Macauley
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada; Department of Chemistry, University of Alberta, Edmonton, Canada.
| |
Collapse
|
57
|
Balogh A, Toth E, Romero R, Parej K, Csala D, Szenasi NL, Hajdu I, Juhasz K, Kovacs AF, Meiri H, Hupuczi P, Tarca AL, Hassan SS, Erez O, Zavodszky P, Matko J, Papp Z, Rossi SW, Hahn S, Pallinger E, Than NG. Placental Galectins Are Key Players in Regulating the Maternal Adaptive Immune Response. Front Immunol 2019; 10:1240. [PMID: 31275299 PMCID: PMC6593412 DOI: 10.3389/fimmu.2019.01240] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 05/16/2019] [Indexed: 12/12/2022] Open
Abstract
Galectins are potent immunomodulators that regulate maternal immune responses in pregnancy and prevent the rejection of the semi-allogeneic fetus that also occurs in miscarriages. We previously identified a gene cluster on Chromosome 19 that expresses a subfamily of galectins, including galectin-13 (Gal-13) and galectin-14 (Gal-14), which emerged in anthropoid primates. These galectins are expressed only by the placenta and induce the apoptosis of activated T lymphocytes, possibly contributing to a shifted maternal immune balance in pregnancy. The placental expression of Gal-13 and Gal-14 is decreased in preeclampsia, a life-threatening obstetrical syndrome partly attributed to maternal anti-fetal rejection. This study is aimed at revealing the effects of Gal-13 and Gal-14 on T cell functions and comparing the expression of these galectins in placentas from healthy pregnancies and miscarriages. First-trimester placentas were collected from miscarriages and elective termination of pregnancies, tissue microarrays were constructed, and then the expression of Gal-13 and Gal-14 was analyzed by immunohistochemistry and immunoscoring. Recombinant Gal-13 and Gal-14 were expressed and purified, and their effects were investigated on primary peripheral blood T cells. The binding of Gal-13 and Gal-14 to T cells and the effects of these galectins on apoptosis, activation marker (CD25, CD71, CD95, HLA-DR) expression and cytokine (IL-1β, IL-6, IL-8, IL-10, IFNγ) production of T cells were examined by flow cytometry. Gal-13 and Gal-14 are primarily expressed by the syncytiotrophoblast at the maternal-fetal interface in the first trimester, and their placental expression is decreased in miscarriages compared to first-trimester controls. Recombinant Gal-13 and Gal-14 bind to T cells in a population- and activation-dependent manner. Gal-13 and Gal-14 induce apoptosis of Th and Tc cell populations, regardless of their activation status. Out of the investigated activation markers, Gal-14 decreases the cell surface expression of CD71, Gal-13 increases the expression of CD25, and both galectins increase the expression of CD95 on T cells. Non-activated T cells produce larger amounts of IL-8 in the presence of Gal-13 or Gal-14. In conclusion, these results show that Gal-13 and Gal-14 already provide an immunoprivileged environment at the maternal-fetal interface during early pregnancy, and their reduced expression is related to miscarriages.
Collapse
Affiliation(s)
- Andrea Balogh
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Department of Immunology, Eotvos Lorand University, Budapest, Hungary
| | - Eszter Toth
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Roberto Romero
- Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, MD and Detroit, MI, United States.,Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, United States.,Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, United States.,Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI, United States
| | - Katalin Parej
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Structural Biophysics Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Diana Csala
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Nikolett L Szenasi
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Istvan Hajdu
- Structural Biophysics Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Kata Juhasz
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Arpad F Kovacs
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Hungary
| | | | - Petronella Hupuczi
- Maternity Private Clinic of Obstetrics and Gynecology, Budapest, Hungary
| | - Adi L Tarca
- Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, MD and Detroit, MI, United States.,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, United States.,Department of Computer Science, Wayne State University College of Engineering, Detroit, MI, United States
| | - Sonia S Hassan
- Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, MD and Detroit, MI, United States.,Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, United States.,Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States
| | - Offer Erez
- Division of Obstetrics and Gynecology, Maternity Department "D", Faculty of Health Sciences, Soroka University Medical Center, School of Medicine, Ben Gurion University of the Negev, Beer-Sheva, Israel
| | - Peter Zavodszky
- Structural Biophysics Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Janos Matko
- Department of Immunology, Eotvos Lorand University, Budapest, Hungary
| | - Zoltan Papp
- Maternity Private Clinic of Obstetrics and Gynecology, Budapest, Hungary.,Department of Obstetrics and Gynecology, Semmelweis University, Budapest, Hungary
| | - Simona W Rossi
- Department of Biomedicine, University and University Hospital Basel, Basel, Switzerland
| | - Sinuhe Hahn
- Department of Biomedicine, University and University Hospital Basel, Basel, Switzerland
| | - Eva Pallinger
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Budapest, Hungary
| | - Nandor Gabor Than
- Systems Biology of Reproduction Momentum Research Group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary.,Maternity Private Clinic of Obstetrics and Gynecology, Budapest, Hungary.,First Department of Pathology and Experimental Cancer Research, Semmelweis University, Budapest, Hungary
| |
Collapse
|
58
|
Wasim L, Buhari FHM, Yoganathan M, Sicard T, Ereño-Orbea J, Julien JP, Treanor B. N-Linked Glycosylation Regulates CD22 Organization and Function. Front Immunol 2019; 10:699. [PMID: 31019513 PMCID: PMC6458307 DOI: 10.3389/fimmu.2019.00699] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 03/14/2019] [Indexed: 11/29/2022] Open
Abstract
The organization and clustering of cell surface proteins plays a critical role in controlling receptor signaling; however, the biophysical mechanisms regulating these parameters are not well understood. Elucidating these mechanisms is highly significant to our understanding of immune function in health and disease, given the importance of B cell receptor (BCR) signaling in directing B cells to produce antibodies for the clearance of pathogens, and the potential deleterious effects of dysregulated BCR signaling, such as in B cell malignancies or autoimmune disease. One of main inhibitory co-receptors on B cells is CD22, a sialic-acid binding protein, which interacts homotypically with other sialylated CD22 molecules, as well as heterotypically with IgM and CD45. Although the importance of CD22 in attenuating BCR signaling is well established, we still do not fully understand what mediates CD22 organization and association to BCRs. CD22 is highly glycosylated, containing 12 N-linked glycosylation sites on its extracellular domain, the function of which remain to be resolved. We were interested in how these glycosylation sites mediate homotypic vs. heterotypic interactions. To this end, we mutated five out of the six N-linked glycosylation residues on CD22 localized closest to the sialic acid binding site. Glycan site N101 was not mutated as this resulted in lack of CD22 expression. We used dual-color super-resolution imaging to investigate the impact of altered glycosylation of CD22 on the nanoscale organization of CD22 and its association with BCR. We show that mutation of these five glycosylation sites increased the clustering tendency of CD22 and resulted in higher density CD22 nanoclusters. Consistent with these findings of altered CD22 organization, we found that mutation of N-glycan sites attenuated CD22 phosphorylation upon BCR stimulation, and consequently, increased BCR signaling. Importantly, we identified that these sites may be ligands for the soluble secreted lectin, galectin-9, and are necessary for galectin-9 mediated inhibition of BCR signaling. Taken together, these findings implicate N-linked glycosylation in the organization and function of CD22, likely through regulating heterotypic interactions between CD22 and its binding partners.
Collapse
Affiliation(s)
- Laabiah Wasim
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | | | - Myuran Yoganathan
- Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON, Canada
| | - Taylor Sicard
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada.,The Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - June Ereño-Orbea
- The Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - Jean-Philippe Julien
- Department of Immunology, University of Toronto, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada.,The Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - Bebhinn Treanor
- Department of Immunology, University of Toronto, Toronto, ON, Canada.,Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada.,Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON, Canada
| |
Collapse
|
59
|
Colomb F, Giron LB, Trbojevic-Akmacic I, Lauc G, Abdel-Mohsen M. Breaking the Glyco-Code of HIV Persistence and Immunopathogenesis. Curr HIV/AIDS Rep 2019; 16:151-168. [PMID: 30707400 PMCID: PMC6441623 DOI: 10.1007/s11904-019-00433-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Glycoimmunology is an emerging field focused on understanding how immune responses are mediated by glycans (carbohydrates) and their interaction with glycan-binding proteins called lectins. How glycans influence immunological functions is increasingly well understood. In a parallel way, in the HIV field, it is increasingly understood how the host immune system controls HIV persistence and immunopathogenesis. However, what has mostly been overlooked, despite its potential for therapeutic applications, is the role that the host glycosylation machinery plays in modulating the persistence and immunopathogenesis of HIV. Here, we will survey four areas in which the links between glycan-lectin interactions and immunology and between immunology and HIV are well described. For each area, we will describe these links and then delineate the opportunities for the HIV field in investigating potential interactions between glycoimmunology and HIV persistence/immunopathogenesis. RECENT FINDINGS Recent studies show that the human glycome (the repertoire of human glycan structures) plays critical roles in driving or modulating several cellular processes and immunological functions that are central to maintaining HIV infection. Understanding the links between glycoimmunology and HIV infection may create a new paradigm for discovering novel glycan-based therapies that can lead to eradication, functional cure, or improved tolerance of lifelong infection.
Collapse
Affiliation(s)
- Florent Colomb
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA, USA
| | - Leila B Giron
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA, USA
| | | | - Gordan Lauc
- Genos Glycoscience Research Laboratory, Borongajska cesta 83h, Zagreb, Croatia
- Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kovacica 1, Zagreb, Croatia
| | | |
Collapse
|
60
|
Colomb F, Giron LB, Premeaux TA, Mitchell BI, Niki T, Papasavvas E, Montaner LJ, Ndhlovu LC, Abdel-Mohsen M. Galectin-9 Mediates HIV Transcription by Inducing TCR-Dependent ERK Signaling. Front Immunol 2019; 10:267. [PMID: 30842775 PMCID: PMC6391929 DOI: 10.3389/fimmu.2019.00267] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 01/31/2019] [Indexed: 12/18/2022] Open
Abstract
Endogenous plasma levels of the immunomodulatory carbohydrate-binding protein galectin-9 (Gal-9) are elevated during HIV infection and remain elevated after antiretroviral therapy (ART) suppression. We recently reported that Gal-9 regulates HIV transcription and potently reactivates latent HIV. However, the signaling mechanisms underlying Gal-9-mediated viral transcription remain unclear. Given that galectins are known to modulate T cell receptor (TCR)-signaling, we hypothesized that Gal-9 modulates HIV transcriptional activity, at least in part, through inducing TCR signaling pathways. Gal-9 induced T cell receptor ζ chain (CD3ζ) phosphorylation (11.2 to 32.1%; P = 0.008) in the J-Lat HIV latency model. Lck inhibition reduced Gal-9-mediated viral reactivation in the J-Lat HIV latency model (16.8-0.9%; P < 0.0001) and reduced both Gal-9-mediated CD4+ T cell activation (10.3 to 1.65% CD69 and CD25 co-expression; P = 0.0006), and IL-2/TNFα secretion (P < 0.004) in primary CD4+ T cells from HIV-infected individuals on suppressive ART. Using phospho-kinase antibody arrays, we found that Gal-9 increased the phosphorylation of the TCR-downstream signaling molecules ERK1/2 (26.7-fold) and CREB (6.6-fold). ERK and CREB inhibitors significantly reduced Gal-9-mediated viral reactivation (16.8 to 2.6 or 12.6%, respectively; P < 0.0007). Given that the immunosuppressive rapamycin uncouples HIV latency reversal from cytokine-associated toxicity, we also investigated whether rapamycin could uncouple Gal-9-mediated latency reactivation from its concurrent pro-inflammatory cytokine production. Rapamycin reduced Gal-9-mediated secretion of IL-2 (4.4-fold, P = 0.001) and TNF (4-fold, P = 0.02) without impacting viral reactivation (16.8% compared to 16.1%; P = 0.2). In conclusion, Gal-9 modulates HIV transcription by activating the TCR-downstream ERK and CREB signaling pathways in an Lck-dependent manner. Our findings could have implications for understanding the role of endogenous galectin interactions in modulating TCR signaling and maintaining chronic immune activation during ART-suppressed HIV infection. In addition, uncoupling Gal-9-mediated viral reactivation from undesirable pro-inflammatory effects, using rapamycin, may increase the potential utility of recombinant Gal-9 within the reversal of HIV latency eradication framework.
Collapse
Affiliation(s)
- Florent Colomb
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, PA, United States
| | - Leila B. Giron
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, PA, United States
| | - Thomas A. Premeaux
- Department of Tropical Medicine, Hawaii Center for AIDS, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, United States
| | - Brooks I. Mitchell
- Department of Tropical Medicine, Hawaii Center for AIDS, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, United States
| | - Toshiro Niki
- GalPharma Co. Ltd., Takamatsu-shi, Takamatsu, Japan
- Department of Immunology and Immunopathology, Kagawa University, Takamatsu, Japan
| | - Emmanouil Papasavvas
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, PA, United States
| | - Luis J. Montaner
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, PA, United States
| | - Lishomwa C. Ndhlovu
- Department of Tropical Medicine, Hawaii Center for AIDS, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, United States
| | - Mohamed Abdel-Mohsen
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, PA, United States
| |
Collapse
|
61
|
Giovannone N, Smith LK, Treanor B, Dimitroff CJ. Galectin-Glycan Interactions as Regulators of B Cell Immunity. Front Immunol 2018; 9:2839. [PMID: 30564237 PMCID: PMC6288978 DOI: 10.3389/fimmu.2018.02839] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/19/2018] [Indexed: 12/12/2022] Open
Abstract
Cell surface glycans and their glycan-binding partners (lectins) have generally been recognized as adhesive assemblies with neighbor cells or matrix scaffolds in organs and the blood stream. However, our understanding of the roles for glycan-lectin interactions in immunity has expanded substantially to include regulation of nearly every stage of an immune response, from pathogen sensing to immune contraction. In this Mini-Review, we discuss the role of the ß-galactoside-binding lectins known as galectins specifically in the regulation of B-lymphocyte (B cell) development, activation, and differentiation. In particular, we highlight several recent studies revealing new roles for galectin (Gal)-9 in the modulation of B cell receptor-mediated signaling and activation in mouse and man. The roles for cell surface glycosylation, especially I-branching of N-glycans synthesized by the glycosyltransferase GCNT2, in the regulation of Gal-9 binding activity are also detailed. Finally, we consider how dysregulation of these factors may contribute to aberrant immune activation and autoimmune disease.
Collapse
Affiliation(s)
- Nicholas Giovannone
- Department of Dermatology, Brigham and Women's Hospital, Boston, MA, United States
- Harvard Medical School, Boston, MA, United States
| | - Logan K. Smith
- Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Bebhinn Treanor
- Department of Immunology, University of Toronto, Toronto, ON, Canada
- Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON, Canada
| | - Charles J. Dimitroff
- Department of Dermatology, Brigham and Women's Hospital, Boston, MA, United States
- Harvard Medical School, Boston, MA, United States
| |
Collapse
|
62
|
Meyer SJ, Linder AT, Brandl C, Nitschke L. B Cell Siglecs-News on Signaling and Its Interplay With Ligand Binding. Front Immunol 2018; 9:2820. [PMID: 30559744 PMCID: PMC6286995 DOI: 10.3389/fimmu.2018.02820] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 11/15/2018] [Indexed: 12/11/2022] Open
Abstract
CD22 and Siglec-G are members of the Siglec family. Both are inhibitory co-receptors on the surface of B cells and inhibit B-cell receptor induced signaling, characterized by inhibition of the calcium mobilization and cellular activation. CD22 functions predominantly as an inhibitor on conventional B cells, while Siglec-G is an important inhibitor on the B1a-cell subset. These two B-cell Siglecs do not only inhibit initial signaling, but also have an important function in preventing autoimmunity, as double deficient mice develop a lupus-like phenotype with age. Siglecs are characterized by their conserved ability to bind terminal sialic acid of glycans on the cell surface, which is important to regulate the inhibitory role of Siglecs. While CD22 binds α2,6-linked sialic acids, Siglec-G can bind both α2,6-linked and α2,3-linked sialic acids. Interestingly, ligand binding is differentially regulating the ability of CD22 and Siglec-G to control B-cell activation. Within the last years, quite a few studies focused on the different functions of B-cell Siglecs and the interplay of ligand binding and signal inhibition. This review summarizes the role of CD22 and Siglec-G in regulating B-cell receptor signaling, membrane distribution with the importance of ligand binding, preventing autoimmunity and the role of CD22 beyond the naïve B-cell stage. Additionally, this review article features the long time discussed interaction between CD45 and CD22 with highlighting recent data, as well as the interplay between CD22 and Galectin-9 and its influence on B-cell receptor signaling. Moreover, therapeutical approaches targeting human CD22 will be elucidated.
Collapse
Affiliation(s)
- Sarah J Meyer
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| | - Alexandra T Linder
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| | - Carolin Brandl
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| | - Lars Nitschke
- Division of Genetics, Department of Biology, University of Erlangen, Erlangen, Germany
| |
Collapse
|
63
|
Mylvaganam SM, Grinstein S, Freeman SA. Picket-fences in the plasma membrane: functions in immune cells and phagocytosis. Semin Immunopathol 2018; 40:605-615. [DOI: 10.1007/s00281-018-0705-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 09/03/2018] [Indexed: 12/20/2022]
|