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Furment MM, Perl A. Immmunometabolism of systemic lupus erythematosus. Clin Immunol 2024; 261:109939. [PMID: 38382658 DOI: 10.1016/j.clim.2024.109939] [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: 01/08/2024] [Revised: 01/26/2024] [Accepted: 02/09/2024] [Indexed: 02/23/2024]
Abstract
Systemic lupus erythematosus (SLE) is a potentially fatal chronic autoimmune disease which is underlain by complex dysfunction of the innate and adaptive immune systems. Although a series of well-defined genetic and environmental factors have been implicated in disease etiology, neither the development nor the persistence of SLE is well understood. Given that several disease susceptibility genes and environmental factors interact and influence inflammatory lineage specification through metabolism, the field of immunometabolism has become a forefront of cutting edge research. Along these lines, metabolic checkpoints of pathogenesis have been identified as targets of effective therapeutic interventions in mouse models and validated in clinical trials. Ongoing studies focus on mitochondrial oxidative stress, activation of the mechanistic target of rapamycin, calcium signaling, glucose utilization, tryptophan degradation, and metabolic cross-talk between gut microbiota and the host immune system.
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Affiliation(s)
- Marlene Marte Furment
- Departments of Medicine, State University of New York, Upstate Medical University, Norton College of Medicine, Syracuse, New York 13210, United States of America
| | - Andras Perl
- Departments of Medicine, State University of New York, Upstate Medical University, Norton College of Medicine, Syracuse, New York 13210, United States of America; Biochemistry and Molecular Biology, State University of New York, Upstate Medical University, Norton College of Medicine, Syracuse, New York 13210, United States of America; Microbiology and Immunology, State University of New York, Upstate Medical University, Norton College of Medicine, Syracuse, New York 13210, United States of America.
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Patients with systemic lupus erythematosus show increased proportions of CD19 +CD20 - B cells and secretion of related autoantibodies. Clin Rheumatol 2020; 40:151-165. [PMID: 32542581 DOI: 10.1007/s10067-020-05220-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/12/2020] [Accepted: 06/02/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND At present, anti-CD20 monoclonal antibody treatments targeting systemic lupus erythematosus (SLE) are complex, variable, and often have disappointing outcomes. High levels of programmed cell death-1 (PD-1) and its ligands (PD-L1, PD-L2) or CD80/CD86 on B cell surfaces are markers of increased B cell activity. However, their expression levels on CD19+CD20+/- B cells and their clinical significance for SLE dynamics have not been carefully investigated. METHODS Flow cytometry was used to detect the expression levels of PD-1, PD-L1, PD-L2, CD80, and CD86 on CD19+CD20+/- B cells in peripheral blood from SLE patients and healthy controls (HCs). The amount of anti-dsDNA and immunoglobin G (IgG) secreted by CD19+CD20+/- B cells was measured by enzyme-linked immunosorbent assay. RESULTS CD19+CD20- B cell frequency was significantly higher in SLE patients than in HCs (P < 0.001), and was positively correlated with disease activity. In SLE patients, frequencies of PD-1, PD-L1, PD-L2, and CD86 on CD19+CD20- B cells were significantly higher than CD19+CD20+ B cells (P ≤ 0.002) and were significantly correlated with individual laboratory and clinically based parameters (P < 0.05). In vitro tests, we found that the levels of anti-dsDNA and IgG secreted by CD19+CD20- B cells from patients with SLE were significantly higher than the HC group (P < 0.05). CONCLUSIONS We found abnormal frequency of CD19+CD20- B cells and increased expression of surface markers on these cells from SLE patients. And the CD19+CD20- B cells had the ability to proliferate and secrete anti-dsDNA and IgG. Additionally, our results suggested that CD19+CD20- B cells from SLE patients may be the activated B cells and caused poor efficacy of rituximab. Key Points • CD19+CD20- B cell frequencies were significantly higher in SLE patients. • Frequencies of PD-1 and its ligands on CD19+CD20- B cells increased significantly in SLE patients. • CD19+CD20- B cells in SLE patients had the ability to secrete anti-dsDNA and IgG. • CD19+CD20- B cells in SLE patients may be the activated B cells and caused poor efficacy of rituximab.
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Wardowska A, Komorniczak M, Skoniecka A, Bułło-Piontecka B, Lisowska KA, Dębska-Ślizień MA, Pikuła M. Alterations in peripheral blood B cells in systemic lupus erythematosus patients with renal insufficiency. Int Immunopharmacol 2020; 83:106451. [PMID: 32248020 DOI: 10.1016/j.intimp.2020.106451] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/25/2020] [Accepted: 03/25/2020] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Systemic lupus erythematosus (SLE) is one of the autoimmune diseases, believed to be closely related to hyperactivity of B cells, overproduction of autoantibodies and immune complex formation and deposition in affected tissue. The autoreactive inflammation leads to multiorgan damage with kidney dysfunction in the forefront. Studies on lupus nephritis (LN), affecting the majority of SLE patients, are mainly focused on cells causing local inflammation. The aim of our work was to detect alterations in more accessible peripheral blood B cells in the course of SLE focusing on the influence of renal insufficiency (RI) on those parameters. METHODS We performed a comprehensive flow cytometry analysis of B cell subpopulations, analyzed gene expression patterns with qPCR, and examined serum cytokine levels with multiplex cytokine/chemokine assay. RESULTS We discovered distribution of specific B cell subsets, especially CD38+ cells, plasmablasts, associated with the presence and severity of the disease. Changes in expression of MBD2, DNMT1 and APRIL genes were not only associated with activity of SLE but also were significantly changed in patients with RI. CONCLUSIONS All these results shed new light on the role of circulating B cells, their subpopulations, function, and activity in the SLE with kidney manifestation.
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Affiliation(s)
- Anna Wardowska
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland.
| | - Michał Komorniczak
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | - Aneta Skoniecka
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland
| | - Barbara Bułło-Piontecka
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | | | - M Alicja Dębska-Ślizień
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | - Michał Pikuła
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland
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Lu R, Guthridge JM, Chen H, Bourn RL, Kamp S, Munroe ME, Macwana SR, Bean K, Sridharan S, Merrill JT, James JA. Immunologic findings precede rapid lupus flare after transient steroid therapy. Sci Rep 2019; 9:8590. [PMID: 31197240 PMCID: PMC6565690 DOI: 10.1038/s41598-019-45135-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 05/31/2019] [Indexed: 12/19/2022] Open
Abstract
Systemic lupus erythematosus (SLE) flares elicit progressive organ damage, leading to disability and early mortality. This study evaluated clinical and immunologic factors associated with impending flare in the Biomarkers of Lupus Disease study. Autoantibodies and 32 soluble mediators were measured by multiplex assays, immune pathway activation by gene expression module scores, and immune cell subset frequencies and activation states by flow cytometry. After providing baseline samples, participants received transient steroids to suppress disease and were followed until flare. Flare occurred early (within 60 days of baseline) in 21 participants and late (90–165 days) in 13. At baseline, compared to the late flare group, the early flare group had differential gene expression in monocyte, T cell, interferon, and inflammation modules, as well as significantly higher frequencies of activated (aCD11b+) neutrophils and monocytes, and activated (CD86hi) naïve B cells. Random forest models showed three subgroups of early flare patients, distinguished by greater baseline frequencies of aCD11b+ monocytes, or CD86hi naïve B cells, or both. Increases in these cell populations were the most accurate biomarkers for early flare in this study. These results suggest that SLE flares may arise from an overlapping spectrum of lymphoid and myeloid mechanisms in different patients.
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Affiliation(s)
- Rufei Lu
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA.,Departments of Pathology and Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Joel M Guthridge
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA.,Departments of Pathology and Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Hua Chen
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Rebecka L Bourn
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Stan Kamp
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Melissa E Munroe
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Susan R Macwana
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Krista Bean
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | | | - Joan T Merrill
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Judith A James
- Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA. .,Departments of Pathology and Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA.
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Rabani M, Wilde B, Hübbers K, Xu S, Kribben A, Witzke O, Dolff S. IL-21 dependent Granzyme B production of B-cells is decreased in patients with lupus nephritis. Clin Immunol 2017; 188:45-51. [PMID: 29274388 DOI: 10.1016/j.clim.2017.12.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/06/2017] [Accepted: 12/17/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES B-cells play a crucial role in the pathogenesis of lupus nephritis. Recently, a separate subset has been discovered characterized by expression of Granzyme B. The aim of this study is to investigate this subset in patients with systemic lupus erythematosus (SLE). METHODS Isolated PBMCs of SLE-patients (n=30) and healthy controls (n=21) were in vitro stimulated with CPG, IgG+IgM and IL-21. Patients were sub-grouped in patients with and without biopsy proven lupus nephritis. B-cells were analyzed for intracellular Granzyme B expression by flow cytometry. RESULTS The strongest stimulus for Granzyme B secretion of B-cells was IgG+IgM in presence of IL-21. SLE-patients had a significant decreased percentage of Granzyme B+ B-cells in particular SLE-patients with active disease and with lupus nephritis. CONCLUSIONS The frequency of GrB+ producing B-cells is reduced in SLE patients. This may contribute to an imbalanced B-cell regulation towards effector B-cells which might promote the development of lupus nephritis.
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Affiliation(s)
- Mariam Rabani
- Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Benjamin Wilde
- Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Katharina Hübbers
- Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Shilei Xu
- Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Andreas Kribben
- Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Oliver Witzke
- Department of Infectious Diseases, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Sebastian Dolff
- Department of Infectious Diseases, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany.
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Sukri A, Hanafiah A, Kosai NR, Mohamed Taher M, Mohamed Rose I. Surface Antigen Profiling of Helicobacter pylori-Infected and -Uninfected Gastric Cancer Cells Using Antibody Microarray. Helicobacter 2016; 21:417-27. [PMID: 26807555 DOI: 10.1111/hel.12295] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Comprehensive immunophenotyping cluster of differentiation (CD) antigens in gastric adenocarcinoma, specifically between Helicobacter pylori-infected and -uninfected gastric cancer patients by using DotScan(™) antibody microarray has not been conducted. Current immunophenotyping techniques include flow cytometry and immunohistochemistry are limited to the use of few antibodies for parallel examination. We used DotScan(™) antibody microarray consisting 144 CD antibodies to determine the distribution of CD antigens in gastric adenocarcinoma cells and to elucidate the effect of H. pylori infection toward CD antigen expression in gastric cancer. METHODS Mixed leukocytes population derived from gastric adenocarcinoma patients were immunophenotyped using DotScan(™) antibody microarray. AGS cells were infected with H. pylori strains and cells were captured on DotScan(™) slides. RESULTS Cluster of differentiation antigens involved in perpetuating the tolerance of immune cells to tumor cells was upregulated in gastric adenocarcinoma cells compared to normal cells. CD279 which is essential in T cells apoptosis was found to be upregulated in normal cells. Remarkably, H. pylori-infected gastric cancer patients exhibited upregulated expression of CD27 that important in maintenance of T cells. Infection of cagA+ H. pylori with AGS cells increased CD antigens expression which involved in cancer stem cell while cagA- H. pylori polarized AGS cells to express immune-regulatory CD antigens. Increased CD antigens expression in AGS cells infected with cagA+ H. pylori were also detected in H. pylori-infected gastric cancer patients. CONCLUSION This study suggests the tolerance of immune system toward tumor cells in gastric cancer and distinct mechanisms of immune responses exploited by different H. pylori strains.
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Affiliation(s)
- Asif Sukri
- Department of Medical Microbiology & Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Alfizah Hanafiah
- Department of Medical Microbiology & Immunology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia.
| | - Nik Ritza Kosai
- Department of Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Mustafa Mohamed Taher
- Department of Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Isa Mohamed Rose
- Department of Pathology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
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Heinemann K, Wilde B, Hoerning A, Tebbe B, Kribben A, Witzke O, Dolff S. Decreased IL-10(+) regulatory B cells (Bregs) in lupus nephritis patients. Scand J Rheumatol 2016; 45:312-6. [PMID: 26948375 DOI: 10.3109/03009742.2015.1126346] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
OBJECTIVES Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by B cell-dependent autoantibody production. Recently, a new B-cell subset was discovered that has a regulatory capacity. The aim of this study was to analyse regulatory B cells (Bregs) in SLE patients. METHOD Peripheral mononuclear blood cells (PBMCs) of 34 SLE patients fulfilling the American College of Rheumatology (ACR) criteria for SLE and 21 healthy controls (HC) were included. PBMCs were stained for CD19, CD24, and CD38 and analysed by flow cytometry. In vitro stimulated PBMCs with CpG and restimulated with phorbol 12-myristate 13-acetate (PMA) and ionomycin were investigated for IL-10(+) Bregs . RESULTS The percentages of circulating CD19(+)CD24(hi)CD38(hi) cells in HC were not different those in from SLE patients. The percentages of IL-10(+) Bregs were significantly decreased in SLE patients, in particular those with lupus nephritis (LN), compared to HC. The proportion was independent of disease activity. CONCLUSIONS This is the first study to demonstrate a decrease in IL-10-producing B cells in LN patients compared to HC, reflecting an impaired regulatory function.
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Affiliation(s)
- K Heinemann
- a Department of Nephrology , University Hospital Essen, University Duisburg-Essen , Essen , Germany
| | - B Wilde
- a Department of Nephrology , University Hospital Essen, University Duisburg-Essen , Essen , Germany
| | - A Hoerning
- b Department of Paediatrics and Adolescent Medicine , University Hospital Erlangen, Friedrich-Alexander University of Erlangen-Nuremberg , Erlangen , Germany
| | - B Tebbe
- a Department of Nephrology , University Hospital Essen, University Duisburg-Essen , Essen , Germany
| | - A Kribben
- a Department of Nephrology , University Hospital Essen, University Duisburg-Essen , Essen , Germany
| | - O Witzke
- a Department of Nephrology , University Hospital Essen, University Duisburg-Essen , Essen , Germany
| | - S Dolff
- c Department of Infectious Diseases , University Hospital Essen, University-Duisburg Essen , Essen , Germany
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Abstract
B cells are central players in multiple autoimmune rheumatic diseases as a result of the imbalance between pathogenic and protective B-cell functions, which are presumably mediated by distinct populations. Yet the functional role of different B-cell populations and the contribution of specific subsets to disease pathogenesis remain to be fully understood owing to a large extent to the use of pauci-color flow cytometry. Despite its limitations, this approach has been instrumental in providing a global picture of multiple B-cell abnormalities in multiple human rheumatic diseases, more prominently systemic lupus erythematosus, rheumatoid arthritis and Sjogren’s syndrome. Accordingly, these studies represent the focus of this review. In addition, we also discuss the added value of tapping into the potential of polychromatic flow cytometry to unravel a higher level of B-cell heterogeneity, provide a more nuanced view of B-cell abnormalities in disease and create the foundation for a precise understanding of functional division of labor among the different phenotypic subsets. State-of-the-art polychromatic flow cytometry and novel multidimensional analytical approaches hold tremendous promise for our understanding of disease pathogenesis, the generation of disease biomarkers, patient stratification and personalized therapeutic approaches.
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Affiliation(s)
- Chungwen Wei
- Department of Medicine, Division of Rheumatology and Lowance Center for Human Immunology, Emory University, 615 Michael Street, Atlanta, GA, 30322, USA.
| | - Scott Jenks
- Department of Medicine, Division of Rheumatology and Lowance Center for Human Immunology, Emory University, 615 Michael Street, Atlanta, GA, 30322, USA.
| | - Iñaki Sanz
- Department of Medicine, Division of Rheumatology and Lowance Center for Human Immunology, Emory University, 615 Michael Street, Atlanta, GA, 30322, USA.
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Ward JM, Rose K, Montgomery C, Adrianto I, James JA, Merrill JT, Webb CF. Disease activity in systemic lupus erythematosus correlates with expression of the transcription factor AT-rich-interactive domain 3A. Arthritis Rheumatol 2015; 66:3404-12. [PMID: 25185498 DOI: 10.1002/art.38857] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 08/19/2014] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Systemic lupus erythematosus (SLE) is a complex and multifactorial autoimmune disease with striking clinical, immunologic, and genetic heterogeneity, despite nearly ubiquitous antinuclear antibody (ANA) production. Multiple gene polymorphisms have been associated with the disease, but these individually account for only a very small percentage of overall SLE risk. In earlier studies, constitutive expression of the DNA-binding protein AT-rich-interactive domain 3A (ARID3a) in transgenic mouse B lymphocyte lineage cells led to spontaneous ANA production and preferential development of B cells associated with production of polyreactive antibodies. Therefore, we undertook this study to determine whether ARID3a was overexpressed in B lymphocytes of SLE patients and whether ARID3a expression was associated with disease severity. METHODS A cross-section of SLE patients, rheumatoid arthritis patients, and age- and sex-matched controls was analyzed longitudinally for lupus disease activity, numbers of ARID3a+ peripheral blood mononuclear B cells from multiple B cell subsets, and immunoglobulin and cytokine levels. RESULTS Fifty of 115 SLE patients (43%) had dramatically increased numbers of ARID3a+ B cells compared to healthy controls. ARID3a was not expressed in naive B cells of healthy controls, but was abundant in these precursors of antibody-secreting cells in SLE patients. Total numbers of ARID3a+ B cells correlated with increased disease activity as defined by SLE Disease Activity Index scores in individuals assessed at 3 time points. CONCLUSION These findings identify B cell anomalies in SLE that allow stratification of patient samples based on ARID3a expression and implicate ARID3a as a potential marker of CD19+ B lymphocytes correlated with disease activity.
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Affiliation(s)
- Julie M Ward
- Oklahoma Medical Research Foundation and Oklahoma University Health Sciences Center, Oklahoma City
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Fan H, Liu F, Dong G, Ren D, Xu Y, Dou J, Wang T, Sun L, Hou Y. Activation-induced necroptosis contributes to B-cell lymphopenia in active systemic lupus erythematosus. Cell Death Dis 2014; 5:e1416. [PMID: 25210799 PMCID: PMC4225223 DOI: 10.1038/cddis.2014.375] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 07/30/2014] [Accepted: 08/01/2014] [Indexed: 02/07/2023]
Abstract
B-cell abnormality including excessive activation and lymphopenia is a central feature of systemic lupus erythematosus (SLE). Although activation threshold, auto-reaction and death of B cells can be affected by intrinsical and/or external signaling, the underlying mechanisms are unclear. Herein, we demonstrate that co-activation of Toll-like receptor 7 (TLR7) and B-cell receptor (BCR) pathways is a core event for the survival/dead states of B cells in SLE. We found that the mortalities of CD19(+)CD27(-) and CD19(+)IgM(+) B-cell subsets were increased in the peripheral blood mononuclear cells (PBMCs) of SLE patients. The gene microarray analysis of CD19(+) B cells from active SLE patients showed that the differentially expressed genes were closely correlated to TLR7, BCR, apoptosis, necroptosis and immune pathways. We also found that co-activation of TLR7 and BCR could trigger normal B cells to take on SLE-like B-cell characters including the elevated viability, activation and proliferation in the first 3 days and necroptosis in the later days. Moreover, the necroptotic B cells exhibited mitochondrial dysfunction and hypoxia, along with the elevated expression of necroptosis-related genes, consistent with that in both SLE B-cell microarray and real-time PCR verification. Expectedly, pretreatment with the receptor-interacting protein kinase 1 (RIPK1) inhibitor Necrostatin-1, and not the apoptosis inhibitor zVAD, suppressed B-cell death. Importantly, B cells from additional SLE patients also significantly displayed high expression levels of necroptosis-related genes compared with those from healthy donors. These data indicate that co-activation of TLR7 and BCR pathways can promote B cells to hyperactivation and ultimately necroptosis. Our finding provides a new explanation on B-cell lymphopenia in active SLE patients. These data suggest that extrinsic factors may increase the intrinsical abnormality of B cells in SLE patients.
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Affiliation(s)
- H Fan
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - F Liu
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - G Dong
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - D Ren
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - Y Xu
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - J Dou
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - T Wang
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
| | - L Sun
- Department of Immunology and Rheumatology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Y Hou
- The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing, China
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Vadasz Z, Haj T, Balbir A, Peri R, Rosner I, Slobodin G, Kessel A, Toubi E. A regulatory role for CD72 expression on B cells in systemic lupus erythematosus. Semin Arthritis Rheum 2013; 43:767-71. [PMID: 24461079 DOI: 10.1016/j.semarthrit.2013.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 11/07/2013] [Accepted: 11/22/2013] [Indexed: 10/25/2022]
Abstract
BACKGROUND B regulatory cells and their regulatory products/markers, such us semaphorin 3A (sema3A) and its receptor NP-1, FcγIIB, IL-10, and others, act at the very base of self-tolerance, maintenance, and prevention of autoimmune disease development. OBJECTIVES The aim of the present study was to assess the involvement of CD72, a regulatory receptor on B cells, in systemic lupus erythematosus (SLE). In addition, the potential of soluble sema3A in enhancing the expression of CD72 on B cells of SLE patients was investigated. RESULTS CD72 expression on activated B cells of SLE patients was significantly lower than that of normal controls. This lower expression of CD72 in SLE patients correlated inversely with SLE disease activity and was associated with lupus nephritis, the presence of anti-dsDNA antibodies, and low levels of complement. Co-culture of purified B cells from healthy controls with condition-media containing recombinant sema3A resulted in significant enhancement of CD72. Similar enhancement of CD72 on activated B cells from SLE patients, though significant, was still lower than in normal individuals. CONCLUSIONS The lower expression of CD72 on activated B cells from SLE patients correlates with SLE disease activity, lupus nephritis, the presence of anti-dsDNA antibodies, and low levels of complement. The improvement of CD72 expression following the addition of soluble semaphorin 3A suggests that CD72 may be useful as a biomarker to be followed during the treatment of SLE.
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Affiliation(s)
- Zahava Vadasz
- Division of Allergy and Clinical Immunology, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Tharwat Haj
- Division of Allergy and Clinical Immunology, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Alexandra Balbir
- Rheumatology Unit, Rambam Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Regina Peri
- Division of Allergy and Clinical Immunology, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Itzhak Rosner
- Rheumatology Unit, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Gleb Slobodin
- Rheumatology Unit, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Aharon Kessel
- Division of Allergy and Clinical Immunology, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Elias Toubi
- Division of Allergy and Clinical Immunology, Bnai Zion Medical Center, Haifa, Israel; Ruth & Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel.
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Fauchais AL, Lise MC, Marget P, Lapeybie FX, Bezanahary H, Martel C, Dumonteil S, Sparsa A, Lalloué F, Ly K, Essig M, Vidal E, Jauberteau MO. Serum and lymphocytic neurotrophins profiles in systemic lupus erythematosus: a case-control study. PLoS One 2013; 8:e79414. [PMID: 24223945 PMCID: PMC3815153 DOI: 10.1371/journal.pone.0079414] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Accepted: 09/26/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Neurotrophins play a central role in the development and maintenance of the nervous system. However, neurotrophins can also modulate B and T cell proliferation and activation, especially via autocrine loops. We hypothesized that both serum and lymphocytic neurotrophin levels may be deregulated in systemic Lupus erythematosus (SLE) and may reflect clinical symptoms of the disease. METHODS Neurotrophins in the serum (ELISA tests) and lymphocytes (flow cytometry) were measured in 26 SLE patients and 26 control subjects. Th1 (interferon-γ) and Th2 (IL-10) profiles and serum concentration of BAFF were assessed by ELISA in the SLE and control subjects. FINDINGS We have demonstrated that both NGF and BDNF serum levels are higher in SLE patients than healthy controls (p=0.003 and p<0.001), independently of Th1 or Th2 profiles. Enhanced serum NT-3 levels (p=0.003) were only found in severe lupus flares (i.e. SLEDAI ≥ 10) and significantly correlated with complement activation (decreased CH 50, Γ=-0.28, p=0.03). Furthermore, there was a negative correlation between serum NGF levels and the number of circulating T regulatory cells (Γ=0.48, p=0.01). In circulating B cells, production of both NGF and BDNF was greater in SLE patients than in healthy controls. In particular, the number of NGF-secreting B cells correlated with decreased complement levels (p=0.05). One month after SLE flare treatment, BDNF levels decreased; in contrast, NGF and NT-3 levels remained unchanged. CONCLUSION This study demonstrates that serum and B cell levels of both NGF and BDNF are increased in SLE, suggesting that the neurotrophin production pathway is deregulated in this disease. These results must be confirmed in a larger study with naive SLE patients, in order to avoid the potential confounding influence of prior immune-modulating treatments on neurotrophin levels.
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Affiliation(s)
- Anne-Laure Fauchais
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
- * E-mail:
| | - Marie-Claude Lise
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
| | - Pierre Marget
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
| | - François-Xavier Lapeybie
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Holy Bezanahary
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Clothilde Martel
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Stéphanie Dumonteil
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Agnès Sparsa
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Dermatology, Limoges University Hospital, Limoges, France
| | - Fabrice Lalloué
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
| | - Kim Ly
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Marie Essig
- Department of Nephrology, Limoges University Hospital, Limoges, France
| | - Elisabeth Vidal
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
| | - Marie-Odile Jauberteau
- Limoges University Hospital, Equipe Accueil 3842-Clinical Immunology Laboratory, Fr GEIST, Limoges, France
- Department of Internal Medicine, Limoges University Hospital, Limoges, France
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Yehudai D, Snir A, Peri R, Halasz K, Haj T, Odeh M, Kessel A. B cell-activating factor enhances interleukin-6 and interleukin-10 production by ODN-activated human B cells. Scand J Immunol 2012; 76:371-7. [PMID: 22725135 DOI: 10.1111/j.1365-3083.2012.02752.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We aim to investigate the additive value of B cell-activating factor (BAFF) when added to oligodeoxynucleotides (ODN)-activated B cells with respect to TLR-9, CD69, MHC-II expression, IL-6 and IL-10 secretion and B cell cycling. Therefore, B cells from healthy individuals were incubated under the following conditions: (1) B cells with medium, (2) B cells with ODN 0.5 μm, (3) B cells with BAFF 20 μm and (4) B cells with both ODN 0.5 μm and BAFF 20 μm. We found that addition of BAFF did not enhance the expression of TLR-9, CD69 and MHC-II in ODN-activated B cells. Incubation of B cells with BAFF and ODN together leads to a marked elevation of IL-6 and IL-10 levels compared to ODN alone. Synthesis and mitosis were higher in B cells stimulated by BAFF than in B cells stimulated by ODN. These findings suggest that both BAFF and TLR-9 contribute independently to B cell function.
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Affiliation(s)
- D Yehudai
- Department of Internal Medicine A, Bnai Zion Medical Center, Faculty of Medicine, Technion, Haifa, Israel
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Lupus nephritis: an overview of recent findings. Autoimmune Dis 2012; 2012:849684. [PMID: 22536486 PMCID: PMC3318208 DOI: 10.1155/2012/849684] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Accepted: 11/30/2011] [Indexed: 11/18/2022] Open
Abstract
Lupus nephritis (LN) is one of the most serious complications of systemic lupus erythematosus (SLE) since it is the major predictor of poor prognosis. In susceptible individuals suffering of SLE, in situ formation and deposit of immune complexes (ICs) from apoptotic bodies occur in the kidneys as a result of an amplified epitope immunological response. IC glomerular deposits generate release of proinflammatory cytokines and cell adhesion molecules causing inflammation. This leads to monocytes and polymorphonuclear cells chemotaxis. Subsequent release of proteases generates endothelial injury and mesangial proliferation. Presence of ICs promotes adaptive immune response and causes dendritic cells to release type I interferon. This induces maturation and activation of infiltrating T cells, and amplification of Th2, Th1 and Th17 lymphocytes. Each of them, amplify B cells and activates macrophages to release more proinflammatory molecules, generating effector cells that cannot be modulated promoting kidney epithelial proliferation and fibrosis. Herein immunopathological findings of LN are reviewed.
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Decrease in circulating DNA, IL-10 and BAFF levels in newly-diagnosed SLE patients after corticosteroid and chloroquine treatment. Cell Immunol 2012; 276:196-203. [DOI: 10.1016/j.cellimm.2012.05.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 04/18/2012] [Accepted: 05/14/2012] [Indexed: 01/05/2023]
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Wang JH, Wu Q, Yang P, Li H, Li J, Mountz JD, Hsu HC. Type I interferon-dependent CD86(high) marginal zone precursor B cells are potent T cell costimulators in mice. ACTA ACUST UNITED AC 2011; 63:1054-64. [PMID: 21225691 DOI: 10.1002/art.30231] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE To investigate the role of CD86(high) marginal zone (MZ) precursor B cells in type I interferon (IFN)-induced T cell-dependent responses in autoimmune BXD2 mice. METHODS Confocal microscopic imaging was used to determine the location of plasmacytoid dendritic cells (DCs), MZ precursor B cells, and CD4 T cells in the spleens of BXD2 and BXD2-Ifnar(-/-) mice. Immunohistochemical staining was used to determine IgG(bright) cells in the spleens of BXD2 and BXD2-Ifnar(-/-) mice. Enzyme-linked immunosorbent assay was used to determine serum levels of IFNα and autoantibodies, and 4-hydroxy-3-nitrophenylacetyl hapten (NP)-chicken γ-globulin (CGG) (NP-CGG)- or NP-Ficoll-induced anti-NP2 antibody titers. Real-time quantitative polymerase chain reaction was used to determine the levels of type I IFN transcripts. T cell proliferation was measured using (3) H-thymidine. The expression of CD86 and CD80 was determined by fluorescence-activated cell sorting analysis. RESULTS The deletion of type I IFN receptor abrogated the development of IgG(bright) cells and suppressed a T cell-dependent antibody response. Type I IFN signaling was associated with the expression of CD86, but not CD80, on follicular, MZ, and MZ precursor B cells. However, MZ precursor B cells demonstrated the highest expression of CD86 and the highest capacity for T cell costimulation with intact type I IFN receptor. This effect was blocked by an antibody that neutralizes CD86. In IFN receptor-intact BXD2 mouse spleens, MZ precursor B cells clustered at the T cell-B cell border. CD86 deletion suppressed germinal center formation, autoantibody production, and development of autoimmune diseases in BXD2 mice. CONCLUSION Type I IFN can promote autoimmune responses in BXD2 mice through up-regulation of CD86(high) expression on MZ precursor B cells and trafficking of MZ precursor B cells to the T cell-B cell border to provide costimulation of CD4 T cells.
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The multi-faceted influences of estrogen on lymphocytes: toward novel immuno-interventions strategies for autoimmunity management. Clin Rev Allergy Immunol 2011; 40:16-26. [PMID: 19943123 DOI: 10.1007/s12016-009-8188-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Early studies of the immune system disclosed that, generally, females exhibit stronger responses to a variety of antigens than males. Perhaps as a result of this response, women are more prone to developing autoimmune diseases than men. Yet, the precise cellular and molecular mechanisms remain under investigation. Recently, interferon-gamma and the related pro-inflammatory interleukin-12 were found to be under effects of sex steroid hormones, with potential implications in regulating immune cells and autoimmune responses. In B lymphocytes, functional binding sites for estrogen receptors were identified in the promoter of the gene encoding activation-induced deaminase, an enzyme required for somatic hypermutation, and class-switch recombination. The observation that estrogen exerts direct impacts on antibody affinity-maturation provides a potential mechanism that could account for generating pathogenic high-affinity auto-antibodies. Further deciphering the multi-faceted influences of sex hormones on the responsiveness of immune cells could lead to novel therapeutic interventions for autoimmunity management.
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Ichinose K, Juang YT, Crispín JC, Kis-Toth K, Tsokos GC. Suppression of autoimmunity and organ pathology in lupus-prone mice upon inhibition of calcium/calmodulin-dependent protein kinase type IV. ACTA ACUST UNITED AC 2011; 63:523-9. [PMID: 20954187 DOI: 10.1002/art.30085] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Systemic lupus erythematosus (SLE) is a chronic inflammatory disease associated with aberrant immune cell function. Treatment involves the use of indiscriminate immunosuppression, which results in significant side effects. SLE T cells express high levels of calcium/calmodulin-dependent protein kinase type IV (CaMKIV), which translocates to the nucleus upon engagement of the T cell receptor-CD3 complex and accounts for abnormal T cell function. The purpose of this study was to determine whether inhibition of CaMKIV would improve disease pathology. METHODS We treated MRL/lpr mice with KN-93, a CaMKIV inhibitor, starting at week 8 or week 12 of age and continuing through week 16 and evaluated skin lesions, proteinuria, kidney histopathology, proinflammatory cytokine production, and costimulatory molecule expression. We also determined the effect of silencing of CAMK4 on interferon-γ (IFNγ) expression by human SLE T cells. RESULTS CaMKIV inhibition in MRL/lpr mice resulted in significant suppression of nephritis and skin disease, decreased expression of the costimulatory molecules CD86 and CD80 on B cells, and suppression of IFNγ and tumor necrosis factor α production. In human SLE T cells, silencing of CAMK4 resulted in suppression of IFNγ production. CONCLUSION We conclude that suppression of CaMKIV mitigates disease development in lupus-prone mice by suppressing cytokine production and costimulatory molecule expression. Specific silencing of CAMK4 in human T cells results in similar suppression of IFNγ production. Our data justify the development of small-molecule CaMKIV inhibitors for the treatment of patients with SLE.
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Affiliation(s)
- Kunihiro Ichinose
- Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02115, USA
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Yang DH, Chang DM, Lai JH, Lin FH, Chen CH. Significantly higher percentage of circulating CD27(high) plasma cells in systemic lupus erythematosus patients with infection than with disease flare-up. Yonsei Med J 2010; 51:924-31. [PMID: 20879061 PMCID: PMC2995985 DOI: 10.3349/ymj.2010.51.6.924] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
PURPOSE To distinguish lupus flare-up from infection in systemic lupus erythematosus (SLE), we analyze the expression of circulating CD27(high) plasma cells in SLE patients with and without infection, in comparison to non-SLE patients with infection. MATERIALS AND METHODS The percentage of circulating CD27(high) plasma cells was measured by flow cytometry in the following four groups: 36 SLE patients without infection, 23 SLE patients with infection, eight non-SLE patients with infection, and 26 healthy controls. RESULTS The frequency of CD27(high) plasma cells had a correlation with the SLE disease activity index (SLEDAI) (r = 0.866, p < 0.05), level of anti-dsDNA (r = 0.886, p < 0.05), C3 (r = - 0.392, p < 0.05), and C4 (r = - 0.337, p < 0.05) in SLE patients without infection, but there was no correlation with disease activity in SLE patients with infection. Among three groups in particular-SLE without infection, SLE with infection, and non-SLE with infection- the percentages of CD27(high) plasma cells were elevated. The percentage of CD27(high) plasma cells was higher in SLE patients with infection, when compared to SLE patients without infection. CONCLUSION The percentage of CD27(high) plasma cells is a biomarker for disease activity of SLE without infection, under correlation with SLEDAI, anti-dsDNA, and C3 and C4 level. However, when the SLE patients have an infection, the percentage of CD27(high) plasma cells is not an adequate biomarker for the survey of disease activity. The percentage of CD27(high) plasma cells may serve as a potential parameter to distinguish a lupus flare-up from infection.
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Affiliation(s)
- Deng-Ho Yang
- Division of Rheumatology/Immunology/Allergy, Department of Internal Medicine, Armed-Forces Taichung General Hospital, Taichung, Taiwan. Republic of China.
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Catalán D, Aravena O, Sabugo F, Wurmann P, Soto L, Kalergis AM, Cuchacovich M, Aguillón JC. B cells from rheumatoid arthritis patients show important alterations in the expression of CD86 and FcgammaRIIb, which are modulated by anti-tumor necrosis factor therapy. Arthritis Res Ther 2010; 12:R68. [PMID: 20398308 PMCID: PMC2888223 DOI: 10.1186/ar2985] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2010] [Revised: 03/25/2010] [Accepted: 04/15/2010] [Indexed: 12/16/2022] Open
Abstract
Introduction Several molecules help preserve peripheral B cell tolerance, but when altered, they may predispose to autoimmunity. This work studied the expression of the costimulatory molecule CD86 and the inhibitory receptor for IgG immune complexes FcγRIIb (CD32b), on B cells from rheumatoid arthritis (RA) patients, and the influence of anti-tumor necrosis factor (TNF) therapy. Methods Peripheral B cells from 18 RA patients and 13 healthy donors were characterized using flow cytometry. Eleven patients who underwent a six-month adalimumab therapy were further assessed for phenotypic changes on their B cells. Results RA patients exhibited a high percentage of naïve and memory B cells expressing CD86. In contrast, expression of FcγRIIb was significantly reduced on RA memory B cells and plasmablasts as compared to healthy donors, probably due to downregulation of this receptor when differentiating from naïve to memory cells. These alterations on FcγRIIb were associated with high levels of anti-citrullinated vimentin autoantibodies. In addition, treatment with adalimumab normalized the expression of CD86 on memory B cells and reduced the expression of FcγRIIb, mainly on naïve B cells. Conclusions Our findings show that peripheral B cells from RA patients have an altered expression of key molecules, such as CD86 and FcγRIIb. Because this latter receptor is required for feedback inhibition, a deficient expression might contribute to humoral autoimmune responses. Furthermore, these molecules are likely to be influenced by inflammatory factors, since they were modulated by TNF inhibition.
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Affiliation(s)
- Diego Catalán
- Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Avenida Independencia 1027, Santiago, Chile
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