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Nemčić M, Shkunnikova S, Kifer D, Plavša B, Vučić Lovrenčić M, Morahan G, Duvnjak L, Pociot F, Gornik O. N-glycosylation of immunoglobulin A in children and adults with type 1 diabetes mellitus. Heliyon 2024; 10:e30529. [PMID: 38765169 PMCID: PMC11098780 DOI: 10.1016/j.heliyon.2024.e30529] [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: 04/15/2024] [Accepted: 04/29/2024] [Indexed: 05/21/2024] Open
Abstract
Aims To identify N-glycan structures on immunoglobulin A related to type 1 diabetes mellitus among children at the disease onset and adults with type 1 diabetes mellitus. Methods Human polyclonal IgA N-glycans were profiled using hydrophilic interaction ultra performance liquid chromatography in two cohorts. The first cohort consisted of 62 children at the onset of type 1 diabetes mellitus and 86 of their healthy siblings. The second cohort contained 84 adults with the disease and 84 controls. Associations between N-glycans and type 1 diabetes mellitus were tested using linear mixed model for the paediatric cohort, or general linear model for the adult cohort. False discovery rate was controlled by Benjamini-Hochberg method modified by Li and Ji. Results In children, an increase in a single oligomannose N-glycan was associated with type 1 diabetes mellitus (B = 0.529, p = 0.0067). N-glycome of the adults displayed increased branching (B = 0.466, p = 0.0052), trigalactosylation (B = 0.466, p = 0.0052), trisialylation (B = 0.629, p < 0.001), and mannosylation (B = 0.604, p < 0.001). The strongest association with the disease was a decrease in immunoglobulin A core fucosylation (B = -0.900, p < 0.001). Conclusions Changes in immunoglobulin N-glycosylation patterns in type 1 diabetes point to disruptions in immunoglobulin A catabolism and dysregulated inflammatory capabilities of the antibody, potentially impacting immune responses and inflammation.
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Affiliation(s)
- Matej Nemčić
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, Zagreb, Croatia
| | - Sofia Shkunnikova
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, Zagreb, Croatia
| | - Domagoj Kifer
- Department of Biophysics, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, Zagreb, Croatia
| | - Branimir Plavša
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, Zagreb, Croatia
| | | | - Grant Morahan
- Centre for Diabetes Research, The Harry Perkins Institute for Medical Research, 6 Verdun St, Nedlands, WA, Australia
- Australian Centre for Accelerating Diabetes Innovations, University of Melbourne, Parkville, Victoria, 3010, VIC, Australia
| | - Lea Duvnjak
- Department of Endocrinology, Vuk Vrhovac University Clinic for Diabetes, Endocrinology and Metabolic Diseases, Merkur University Hospital, Dugi dol 4A, Zagreb, Croatia
| | - Flemming Pociot
- Department of Clinical Research, Steno Diabetes Center Copenhagen, Borgmester Ib Juuls Vej 83, Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, Copenhagen, Denmark
| | - Olga Gornik
- Department of Biochemistry and Molecular Biology, Faculty of Pharmacy and Biochemistry, Ante Kovačića 1, Zagreb, Croatia
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Liou LB, Tsai PH, Fang YF, Chen YF, Chen CC, Lai JH. Sialic-Acid-Related Enzymes of B Cells and Monocytes as Novel Markers to Discriminate Improvement Categories and to Fulfill Two Remission Definitions in Rheumatoid Arthritis. Int J Mol Sci 2023; 24:12998. [PMID: 37629178 PMCID: PMC10455111 DOI: 10.3390/ijms241612998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/10/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023] Open
Abstract
The enzymes α-2,6-sialyltransferase 1 (ST6Gal1), neuraminidase 1 (Neu1), α-2,3-sialyltransferase 1 (ST3Gal1), and neuraminidase 3 (Neu3) are known to affect immune cell function. However, it is not known whether the levels of these enzymes relate to remission definitions or differentiate American College of Rheumatology (ACR), European League Against Rheumatism (EULAR), and Simplified Disease Activity Index (SDAI) responses in patients with rheumatoid arthritis (RA). We measured the ST6Gal1, Neu1, ST3Gal1, and Neu3 levels of B cells and monocytes in RA patients and correlated the cells' enzyme levels/ratios with the improvement in the ACR, EULAR and SDAI responses and with the two remission definitions. The difference in the B-cell Neu1 levels differed between the ACR 70% improvement and non-improvement groups (p = 0.043), between the EULAR good major response (improvement) and non-good response groups (p = 0.014), and also between the SDAI 50% or 70% improvement and non-improvement groups (p = 0.001 and 0.018, respectively). The same held true when the RA patients were classified by positive rheumatoid factor or the use of biologics. The B-cell Neu1 levels significantly indicated 2005 modified American Rheumatism Association and 2011 ACR/EULAR remission definitions (area under the curve (AUC) = 0.674 with p = 0.001, and AUC = 0.682 with p < 0.001, respectively) in contrast to the CRP and ESR (all AUCs < 0.420). We suggest that B-cell Neu1 is superior for discriminating ACR, EULAR, and SDAI improvement and is good for predicting two kinds of remission definitions.
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Affiliation(s)
- Lieh-Bang Liou
- Division of Rheumatology, Allergy and Immunology, New Taipei Municipal Tucheng Hospital, New Taipei City 236, Taiwan; (P.-H.T.); (C.-C.C.)
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
- School of Medicine, Chang Gung University College of Medicine, Taoyuan 333, Taiwan
| | - Ping-Han Tsai
- Division of Rheumatology, Allergy and Immunology, New Taipei Municipal Tucheng Hospital, New Taipei City 236, Taiwan; (P.-H.T.); (C.-C.C.)
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
| | - Yao-Fan Fang
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
| | - Yen-Fu Chen
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
| | - Chih-Chieh Chen
- Division of Rheumatology, Allergy and Immunology, New Taipei Municipal Tucheng Hospital, New Taipei City 236, Taiwan; (P.-H.T.); (C.-C.C.)
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
| | - Jenn-Haung Lai
- Division of Rheumatology, Allergy and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan 333, Taiwan; (Y.-F.F.); (Y.-F.C.); (J.-H.L.)
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3
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Liou LB, Jang SS. α-2,3-Sialyltransferase 1 and neuraminidase-3 from monocytes in patients with rheumatoid arthritis correlate with disease activity measures: A pilot study. J Chin Med Assoc 2019; 82:179-185. [PMID: 30913115 DOI: 10.1097/jcma.0000000000000027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND We decided to study the association of monocyte α-2,3-sialyltransferase 1 (ST3Gal-1), neuraminidase-3 (Neu3), α-2,6-sialyltransferase 1 (ST6Gal-1), and neuraminidase-1 (Neu1) levels with disease activity score 28 (DAS28) in human rheumatoid arthritis (RA), considering that mouse monocytes' sialic acid (SIA) levels relate to their phagocytosis and IgG binding ability. METHODS ST3Gal-1, Neu3, ST6Gal-1, Neu1, α-2,3-SIA, and α-2,6-SIA levels on RA peripheral blood monocytes, T cells, and polymorphonuclear cells were determined by using fluorochrome-conjugated anti-cell-specific marker antibodies and fluorochrome-conjugated anti-enzyme antibodies. Simple correlation and linear regression were used to correlate enzyme levels with DAS28. RESULTS RA monocyte ST3Gal-1 and Neu3 levels correlated with DAS28 in patients having DAS28 >5.1 (r = 0.469, p = 0.002; r = 0.410, p = 0.006, respectively). When multivariable analysis was performed for erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and SIA-related enzyme levels in different cell types as independent variables with DAS28 as a dependent variable, monocyte ST3Gal-1 levels correlated with DAS28 (p = 0.009) but not ESR and CRP in patients having DAS28 >5.1 (both p ≥ 0.292). RA monocyte ST3Gal-1 levels correlated with DAS28 (p = 0.010) and with ESR (p < 0.001) at month 0 when applied to all RA patients including both remission and nonremission groups in multivariable analysis. The latter findings persisted longitudinally at month 3. CONCLUSION Monocyte ST3Gal-1 and Neu3 levels correlated longitudinally with DAS28 by two different methods suggest that monocyte ST3Gal-1 and Neu3 levels may be used as biomarkers to monitor RA disease activity.
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Affiliation(s)
- Lieh-Bang Liou
- Division of Rheumatology, Allergy, and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan, ROC
- Department of Medicine, Chang Gung University College of Medicine, Taoyuan, Taiwan, ROC
| | - Shr-Shian Jang
- Division of Rheumatology, Allergy, and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan, ROC
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4
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Plomp R, de Haan N, Bondt A, Murli J, Dotz V, Wuhrer M. Comparative Glycomics of Immunoglobulin A and G From Saliva and Plasma Reveals Biomarker Potential. Front Immunol 2018; 9:2436. [PMID: 30405629 PMCID: PMC6206042 DOI: 10.3389/fimmu.2018.02436] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 10/02/2018] [Indexed: 12/19/2022] Open
Abstract
The N-glycosylation of immunoglobulin (Ig) G, the major antibody in the circulation of human adults, is well known for its influence on antibody effector functions and its alterations with various diseases. In contrast, knowledge on the role of glycans attached to IgA, which is a key immune defense agent in secretions, is very scarce. In this study we aimed to characterize the glycosylation of salivary (secretory) IgA, including the IgA joining chain (JC), and secretory component (SC) and to compare IgA and IgG glycosylation between human plasma and saliva samples to gain a first insight into oral cavity-specific antibody glycosylation. Plasma and whole saliva were collected from 19 healthy volunteers within a 2-h time window. IgG and IgA were affinity-purified from the two biofluids, followed by tryptic digestion and nanoLC-ESI-QTOF-MS(/MS) analysis. Saliva-derived IgG exhibited a slightly lower galactosylation and sialylation as compared to plasma-derived IgG. Glycosylation of IgA1, IgA2, and the JC showed substantial differences between the biofluids, with salivary proteins exhibiting a higher bisection, and lower galactosylation and sialylation as compared to plasma-derived IgA and JC. Additionally, all seven N-glycosylation sites, characterized on the SC of secretory IgA in saliva, carried highly fucosylated and fully galactosylated diantennary N-glycans. This study lays the basis for future research into the functional role of salivary Ig glycosylation as well as its biomarker potential.
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Affiliation(s)
- Rosina Plomp
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
| | - Noortje de Haan
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
| | - Albert Bondt
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
| | - Jayshri Murli
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
| | - Viktoria Dotz
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
| | - Manfred Wuhrer
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, Netherlands
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5
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Bordron A, Bagacean C, Mohr A, Tempescul A, Bendaoud B, Deshayes S, Dalbies F, Buors C, Saad H, Berthou C, Pers JO, Renaudineau Y. Resistance to complement activation, cell membrane hypersialylation and relapses in chronic lymphocytic leukemia patients treated with rituximab and chemotherapy. Oncotarget 2018; 9:31590-31605. [PMID: 30167081 PMCID: PMC6114972 DOI: 10.18632/oncotarget.25657] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 06/04/2018] [Indexed: 01/27/2023] Open
Abstract
The anti-CD20-specific monoclonal antibody rituximab (RTX), in combination with chemotherapy, is commonly used for primary treatment in chronic lymphocytic leukemia (CLL). However, relapses remain important and activation of the complement pathway is one of the mechanisms by which RTX generates the destruction of B cells directly by complement-dependent cytotoxicity (CDC), or indirectly by antibody-dependent cellular phagocytosis. In this study, the RTX capacity to induce CDC was established in 69 untreated CLL patients, this cohort including 34 patients tested before the initiation of RTX-chemotherapy. In vitro CDC-resistance to RTX predicts lower response rates to RTX-chemotherapy and shorter treatment free survival. Furthermore, the predictive value of CDC-resistance was independent from the clinical, cytogenetic and FcγR3A V158F polymorphism status. In contrast, CLL cell resistance to CDC predominates in IGHV unmutated patients and was related to an important α2-6 sialyl transferase activity, which in turn increases cell surface α2-6 hypersialylation. Suspected factors associated with resistance to CDC (CD20, CD55, CD59, factor H, GM1, and sphingomyelin) were not differentially expressed or recruited between the two CLL groups. Altogether, results provide evidence that testing RTX capacity to induce CDC in vitro represents an independent predictive factor of therapeutic effects of RTX, and that α2-6 hypersialylation in CLL cells controls RTX response through the control of the complement pathway. At a time when CLL therapy is moving towards chemo-free treatments, further experiments are required to determine whether performing an initial in vitro assay to appreciate CLL CDC resistance might be useful to select patients.
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Affiliation(s)
- Anne Bordron
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France
| | - Cristina Bagacean
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France.,Laboratory of Immunology and Immunotherapy, CHRU Brest, Hôpital Morvan, Brest, France
| | - Audrey Mohr
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France
| | - Adrian Tempescul
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France.,Department of Haematology, CHRU Brest, Hôpital Morvan, Brest, France
| | - Boutahar Bendaoud
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France.,Laboratory of Immunology and Immunotherapy, CHRU Brest, Hôpital Morvan, Brest, France
| | - Stéphanie Deshayes
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France
| | - Florence Dalbies
- Department of Haematology, CHRU Brest, Hôpital Morvan, Brest, France
| | - Caroline Buors
- Laboratory of Haematology, CHRU Brest, Hôpital Morvan, Brest, France
| | - Hussam Saad
- Department of Haematology, CHRU Brest, Hôpital Morvan, Brest, France
| | - Christian Berthou
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France.,Department of Haematology, CHRU Brest, Hôpital Morvan, Brest, France
| | - Jacques-Olivier Pers
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France
| | - Yves Renaudineau
- U1227 B Lymphocytes and Autoimmunity, Université de Brest, INSERM, IBSAM, Labex IGO, Networks IC-CGO and REpiCGO from 'Canceropole Grand Ouest, Brest, France.,Laboratory of Immunology and Immunotherapy, CHRU Brest, Hôpital Morvan, Brest, France
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6
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Treister NS, Richards SM, Lombardi MJ, Rowley P, Jensen RV, Sullivan DA. Sex-related Differences in Gene Expression in Salivary Glands of BALB/c Mice. J Dent Res 2016; 84:160-5. [PMID: 15668334 DOI: 10.1177/154405910508400210] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Sex-related differences exist in the structure and function of the major glands in a variety of species. Moreover, many of these variations appear to be unique to each tissue. We hypothesized that this sexual dimorphism is due, at least in part, to gland-specific differences in gene expression between males and females. Glands were collected from male and female BALB/c mice (n = 5/sex/experiment), and total RNA was isolated. Samples were analyzed for differentially expressed mRNAs with CodeLink microarrays, and data were evaluated by GeneSifter. Our results demonstrate that significant (P < 0.05) sex-related differences exist in the expression of numerous genes in the major salivary glands, and many of these differences were tissue-specific. These findings support our hypothesis that sex-related differences in the salivary glands are due, at least in part, to tissue-specific variations in gene expression.
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Affiliation(s)
- N S Treister
- Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, MA 02114, USA.
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7
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B cells in Sjögren's syndrome: from pathophysiology to diagnosis and treatment. J Autoimmun 2012; 39:161-7. [PMID: 22749831 DOI: 10.1016/j.jaut.2012.05.014] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 05/20/2012] [Indexed: 11/24/2022]
Abstract
Primary Sjögren's syndrome (pSS) is a chronic autoimmune systemic disease, characterized by a lymphoplasmocytic infiltration and a progressive destruction of salivary and lachrymal glands, leading to ocular and mouth dryness. T cells were originally considered to play the initiating role in the autoimmune process, while B cells were restricted to autoantibody production. However, recent years have seen growing evidence that the roles of B cells in pSS pathophysiology are multiple, and that these cells may actually play a central role in the development of the disease. B cells are over-stimulated and produce excessive amounts of immunoglobulins and various autoantibodies. Peripheral blood and salivary-gland B-cell subset distribution is altered, leading to the constitution of ectopic germinal centers where auto-reactive clones may escape tolerance checkpoints. B cells control T-cell activation by different means: B effector cells guide Th1 or Th2 differentiation, whereas regulatory B cells inhibit T-cell proliferation. Several B-cell specific cytokines, such as BAFF or Flt-3L, are instrumental in the occurrence of B-cell dysfunction. Chronic and excessive stimulation of B cells may lead to the development of lymphoma in pSS patients. Autoantibodies and blood B-cell subset analysis are major contributors of a clinical diagnosis of pSS. These considerations led to the development of B-cell depletion therapies for the management of pSS. Rituximab, a monoclonal antibody to CD20, is the best studied biologics in pSS, but other treatments hold promise, targeting for example CD22 or BAFF. Thus, during the last 20 years, the understanding of the multifaceted roles of B cells in pSS has revolutionized the management of this complex disease.
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8
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The effect of cell concentration on alpha 2,3-sialyltransferase activity in attachment culture of a human erythropoietin-producing Chinese hamster ovary cell line. BIOTECHNOL BIOPROC E 2009. [DOI: 10.1007/s12257-009-0050-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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9
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Le Pottier L, Bendaoud B, Renaudineau Y, Youinou P, Pers JO, Daridon C. New ELISA for B cell-activating factor. Clin Chem 2009; 55:1843-51. [PMID: 19696115 DOI: 10.1373/clinchem.2009.129940] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND The B cell-activating factor of the TNF family (BAFF) is upregulated in autoimmune diseases, but a number of conflicting results have cast doubts on the reliability of the ELISA protocols currently used for its quantification. This situation led us to develop a new ELISA for the measurement of BAFF. METHODS BAFF was purified for use alongside nonglycosylated recombinant BAFF. Two monoclonal antibodies (mAbs) and two polyclonal antibodies (pAbs) to BAFF were used. RESULTS The optimization process showed that the pAb format was preferable to the mAb format as capture antibody, because the pAbs recognized the glycosylated as well as the nonglycosylated forms of BAFF. The most efficient pair of Abs involved using the unconjugated form of a goat pAb to capture BAFF and the same biotinylated goat pAb to detect bound BAFF. This ELISA was not influenced by the presence of rheumatoid factor. CONCLUSIONS This new ELISA helped provide insights into why serum concentrations of BAFF vary between studies for a given population of patients. It is a reliable tool for the management of the diseases in which BAFF is an indication of response to therapy.
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Affiliation(s)
- Laëtitia Le Pottier
- EA 2216 Immunologie et Pathologie and IFR 418 ScInBioS, Université de Brest, Brest, France
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10
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Suzuki H, Moldoveanu Z, Hall S, Brown R, Vu HL, Novak L, Julian BA, Tomana M, Wyatt RJ, Edberg JC, Alarcón GS, Kimberly RP, Tomino Y, Mestecky J, Novak J. IgA1-secreting cell lines from patients with IgA nephropathy produce aberrantly glycosylated IgA1. J Clin Invest 2008; 118:629-39. [PMID: 18172551 DOI: 10.1172/jci33189] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Accepted: 10/24/2007] [Indexed: 01/05/2023] Open
Abstract
Aberrant glycosylation of IgA1 plays an essential role in the pathogenesis of IgA nephropathy. This abnormality is manifested by a deficiency of galactose in the hinge-region O-linked glycans of IgA1. Biosynthesis of these glycans occurs in a stepwise fashion beginning with the addition of N-acetylgalactosamine by the enzyme N-acetylgalactosaminyltransferase 2 and continuing with the addition of either galactose by beta1,3-galactosyltransferase or a terminal sialic acid by a N-acetylgalactosamine-specific alpha2,6-sialyltransferase. To identify the molecular basis for the aberrant IgA glycosylation, we established EBV-immortalized IgA1-producing cells from peripheral blood cells of patients with IgA nephropathy. The secreted IgA1 was mostly polymeric and had galactose-deficient O-linked glycans, characterized by a terminal or sialylated N-acetylgalactosamine. As controls, we showed that EBV-immortalized cells from patients with lupus nephritis and healthy individuals did not produce IgA with the defective galactosylation pattern. Analysis of the biosynthetic pathways in cloned EBV-immortalized cells from patients with IgA nephropathy indicated a decrease in beta1,3-galactosyltransferase activity and an increase in N-acetylgalactosamine-specific alpha2,6-sialyltransferase activity. Also, expression of beta1,3-galactosyltransferase was significantly lower, and that of N-acetylgalactosamine-specific alpha2,6-sialyltransferase was significantly higher than the expression of these genes in the control cells. Thus, our data suggest that premature sialylation likely contributes to the aberrant IgA1 glycosylation in IgA nephropathy and may represent a new therapeutic target.
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Affiliation(s)
- Hitoshi Suzuki
- University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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11
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Youinou P, Devauchelle V, Hutin P, Le Berre R, Saraux A, Pers JO. A Conspicuous Role For B Cells In Sjögren’s Syndrome. Clin Rev Allergy Immunol 2007; 32:231-7. [DOI: 10.1007/s12016-007-8000-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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12
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Raska M, Moldoveanu Z, Suzuki H, Brown R, Kulhavy R, Andrasi J, Hall S, Vu HL, Carlsson F, Lindahl G, Tomana M, Julian BA, Wyatt RJ, Mestecky J, Novak J. Identification and characterization of CMP-NeuAc:GalNAc-IgA1 alpha2,6-sialyltransferase in IgA1-producing cells. J Mol Biol 2007; 369:69-78. [PMID: 17418236 PMCID: PMC1995659 DOI: 10.1016/j.jmb.2007.03.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 03/04/2007] [Accepted: 03/05/2007] [Indexed: 10/23/2022]
Abstract
Glycosylation defects occur in several human diseases. In IgA nephropathy, IgA1 contains O-glycans that are galactose-deficient and consist mostly of core 1 alpha2,6 sialylated N-acetylgalactosamine, a configuration suspected to prevent beta1,3 galactosylation. We confirmed the same aberrancy in IgA1 secreted by the human DAKIKI B cell line. Biochemical assays indicated CMP-NeuAc:GalNAc-IgA1 alpha2,6-sialyltransferase activity in this cell line. However, a candidate enzyme, ST6-GalNAcI, was not transcribed in DAKIKI cells, B cells isolated from blood, or Epstein-Barr virus (EBV)-immortalized IgA1-producing cells from the blood of IgAN patients and healthy controls. Instead, ST6-GalNAcII transcription was detected at a high level. Expression of the ST6-GalNAcII gene and activity of the CMP-NeuAc:GalNAc-IgA1 alpha2,6-sialyltransferase were higher in IgA1-producing cell lines from IgAN patients than in such cells from healthy controls. These data are the first evidence that human cells that lack ST6-GalNAcI can sialylate core 1 GalNAc-Ser/Thr.
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Affiliation(s)
- Milan Raska
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Zina Moldoveanu
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Hitoshi Suzuki
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Rhubell Brown
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Rose Kulhavy
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Judit Andrasi
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Stacy Hall
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Huong L. Vu
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | | | | | - Milan Tomana
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Bruce A. Julian
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Robert J. Wyatt
- University of Tennessee Health Sciences Center and Children’s Foundation Research Center, Memphis, TN, 38103, USA
| | - Jiri Mestecky
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Jan Novak
- University of Alabama at Birmingham, Birmingham, AL, 35294, USA
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13
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Alavi A, Pool AJ, Axford JS. New Insights into Rheumatoid Arthritis Associated Glycosylation Changes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2005; 564:129-38. [PMID: 16400819 DOI: 10.1007/0-387-25515-x_23] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Azita Alavi
- Biochemistry and Immunology, Academic Unit for Musculoskeletal Disease, St Georges Hospital Med School, Cranmer Terrace, London SW17 0RE, UK
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14
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d'Arbonneau F, Pers JO, Devauchelle V, Pennec Y, Saraux A, Youinou P. BAFF-induced changes in B cell antigen receptor–containing lipid rafts in Sjögren's syndrome. ACTA ACUST UNITED AC 2005; 54:115-26. [PMID: 16385503 DOI: 10.1002/art.21478] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To determine the effect of excessive production of BAFF on the distribution and function of B cell subsets in patients with primary Sjögren's syndrome (SS). METHODS The phenotype of B lymphocytes was analyzed by flow cytometry. Differences in the expression level of membrane IgD and CD38 were used to identify B lymphocyte subsets evolving from naive Bm1 through memory Bm5 cells. Based on our finding of a low expression of CD45RA, we sorted Bm2/Bm2' cells to determine the time course of translocation of the CD19 molecule and the B cell receptor into lipid rafts, by confocal microscopy. Serum levels of BAFF were measured by an enzyme-linked immunosorbent assay developed in-house. RESULTS "Circulating" Bm2/Bm2' cells were expanded in patients with primary SS compared with rheumatic disease controls and with normal controls. In addition, these B cell subsets were functionally abnormal. Prolonged residency of the B cell receptor in lipid rafts in these cells was associated with elevated CD19 expression in B cells, most notably, Bm2 and Bm2' cells, obtained from the patients with primary SS. BAFF levels were higher in the patients than in the normal controls and correlated with the percentage of Bm2/Bm2' cells and their expression of CD19 in primary SS patients. These correlations were confirmed by placing sorted Bm1 or Bm2 cells from normal controls in culture in the presence or absence of BAFF. CONCLUSION Bm2/Bm2' cells express more CD19 molecules in primary SS patients than in normal controls. BAFF might participate in this elevated expression of CD19. These patients might be suitable candidates for treatment with BAFF antagonists.
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15
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Leung JC, Tang SC, Chan DT, Lui SL, Lai KN. Increased sialylation of polymeric lambda-IgA1 in patients with IgA nephropathy. J Clin Lab Anal 2002; 16:11-9. [PMID: 11835525 PMCID: PMC6807889 DOI: 10.1002/jcla.2035] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The mechanism of mesangial IgA deposition is poorly understood in IgA nephropathy (IgAN). Abnormal glycosylation of carbohydrate moieties in the hinge region of the IgA molecule has recently attracted much attention. In this report, we studied galactosylation and sialylation profiles in kappa- and lambda-IgA1 from patients with IgAN. Total serum IgA1 was isolated from patients with IgAN or healthy controls by jacalin-affinity chromatography. Six fractions of molecular weight (MW) 50-1,000 kDa were separated by fast protein liquid chromatography (FPLC). Four lectin-binding assays were used to study the sialylation and the presence of terminal galactose or N-acetylgalactosamine (GalNAc) in the O-linked carbohydrate moieties of kappa- or lambda-IgA1. Maackia amurensis agglutinin (MAA) and Sambucus nigra agglutinin (SNA) lectin recognize alpha(2,3)- and alpha(2,6)-linked sialic acid, respectively. Peanut agglutinin (PNA) and Helix aspersa (HA) lectin recognize terminal galactose and GalNAc, respectively. Reduced HA was demonstrated in macromolecular kappa or lambda-IgA1 (300-825 kDa) isolated from patients with IgAN (P < 0.05 compared with healthy controls). Lambda- but not kappa-IgA1 from patients with IgAN bound less to PNA (P < 0.05). The alpha(2,3)-linked sialic acid content in lambda- but not kappa-IgA1 of MW 150-610 kDa from patients was higher than that of controls (P < 0.005). The alpha(2,6)-linked sialic acid content in lambda-IgA1 (300-825 kDa) and kappa-IgA1 (150-610 kDa) from patients was also higher than that of controls. This unusual glycosylation and sialylation pattern of the lambda-IgA1 may have important implications for the pathogenesis of IgAN, as both the masking effect of sialic acid on galactose and the reduced galactosylation will hinder the clearance of macromolecular lambda-IgA1 by asialoglycoprotein receptor of hepatocytes. The negative charge from sialic acid may also favor mesangial deposition of macromolecular lambda-IgA1 in IgAN.
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Affiliation(s)
- Joseph C.K. Leung
- Division of Nephrology, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong
| | - Sydney C.W. Tang
- Division of Nephrology, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong
| | - Daniel T.M. Chan
- Division of Nephrology, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong
| | - Sing Leung Lui
- Division of Nephrology, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong
| | - Kar Neng Lai
- Division of Nephrology, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong
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Basset C, Durand V, Jamin C, Clément J, Pennec Y, Youinou P, Dueymes M, Roitt IM. Increased N-linked glycosylation leading to oversialylation of monomeric immunoglobulin A1 from patients with Sjögren's syndrome. Scand J Immunol 2000; 51:300-6. [PMID: 10736100 DOI: 10.1046/j.1365-3083.2000.00685.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Increased serum immunoglobulin A (IgA) level is a common finding in primary Sjögren's syndrome (pSS). IgA might not be properly eliminated because of an abnormal glycosylation. We reported previously that IgA1 from patients with pSS was oversialylated. We extend this finding by showing that monomeric IgA1 contains more sialic acid (SA) in patients than in controls, as determined by enzyme-linked immunosorbent assay (ELISA) and Western blot with Sambucus nigra agglutinin (SNA), a lectin specific for SA. To localize this excess of SA on the N- and/or O-linked oligosaccharides, we analysed them separately, using N- and O-linked oligosaccharide profiling kits based on fluorophore-assisted carbohydrate electrophoresis. N-linked, but not O-linked, oligosaccharides of patients' IgA1 were oversialylated, and this seemed to be linked to an excess of SA on the same number of polysaccharides as normal IgA1. To localize the abnormality to the Fab and/or Fc fragments, monomeric IgA1 was digested with protease, separated and transferred to nitrocellulose, where SA was identified by SNA. Both Fab and Fc fragments appeared to be oversialylated. Oversialylation of N-linked oligosaccharides of IgA1 from patients with pSS might prevent the recognition of IgA by receptors that are responsible for their clearance, resulting in an excess of serum IgA and related immune complexes.
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Affiliation(s)
- C Basset
- Laboratory of Immunology, Institut de Synergie des Sciences et de la Santé (I3S), Brest, France
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