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Horta S, Neumann F, Yeh SH, Langseth CM, Kangro K, Breukers J, Madaboosi N, Geukens N, Vanhoorelbeke K, Nilsson M, Lammertyn J. Evaluation of Immuno-Rolling Circle Amplification for Multiplex Detection and Profiling of Antigen-Specific Antibody Isotypes. Anal Chem 2021; 93:6169-6177. [PMID: 33823582 DOI: 10.1021/acs.analchem.1c00172] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Antibody characterization is essential for understanding the immune system and development of diagnostics and therapeutics. Current technologies are mainly focusing on the detection of antigen-specific immunoglobulin G (IgG) using bulk singleplex measurements, which lack information on other isotypes and specificity of individual antibodies. Digital immunoassays based on nucleic acid amplification have demonstrated superior performance by allowing the detection of single molecules in a multiplex and sensitive manner. In this study, we demonstrate for the first time an immuno-rolling circle amplification (immuno-RCA) assay for the multiplex detection of three antigen-specific antibody isotypes (IgG, IgA, and IgM) and its integration with microengraving. To validate this approach, we used the autoimmune disease immune-mediated thrombotic thrombocytopenic purpura (iTTP) as the model disease with anti-ADAMTS13 autoantibodies as the diagnostic target molecules. To identify the anti-ADAMTS13 autoantibody isotypes, we designed a pool of three unique antibody-oligonucleotide conjugates for identification and subsequent amplification and visualization via RCA. To validate this approach, we first confirmed an assay specificity of >88% and a low limit of detection of 0.3 ng/mL in the spiked buffer. Subsequently, we performed a dilution series of an iTTP plasma sample for the multiplex detection of the three isotypes with higher sensitivity compared to an enzyme-linked immunosorbent assay. Finally, we demonstrated single-cell analysis of human B cells and hybridoma cells for the detection of secreted antibodies using microengraving and achieved a detection of 23.3 pg/mL secreted antibodies per hour. This approach could help to improve the understanding of antibody isotype distributions and their roles in various diseases.
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Affiliation(s)
- Sara Horta
- Laboratory for Thrombosis Research, IRF Life Sciences, KU Leuven Campus Kulak Kortrijk, Etienne Sabbelaan 53, Kortrijk 8500, Belgium.,Department of Biosystems, Biosensors Group, KU Leuven, Willem De Croylaan 42, Heverlee B-3001, Belgium
| | - Felix Neumann
- Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Tomtebodavägen 23B, Solna 171 65, Sweden
| | - Shu-Hao Yeh
- Department of Biosystems, Biosensors Group, KU Leuven, Willem De Croylaan 42, Heverlee B-3001, Belgium
| | - Christoffer Mattsson Langseth
- Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Tomtebodavägen 23B, Solna 171 65, Sweden
| | - Kadri Kangro
- Laboratory for Thrombosis Research, IRF Life Sciences, KU Leuven Campus Kulak Kortrijk, Etienne Sabbelaan 53, Kortrijk 8500, Belgium.,Icosagen Cell Factory OÜ, Kambja vald, Tartumaa 61713, Estonia
| | - Jolien Breukers
- Department of Biosystems, Biosensors Group, KU Leuven, Willem De Croylaan 42, Heverlee B-3001, Belgium
| | - Narayanan Madaboosi
- Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Tomtebodavägen 23B, Solna 171 65, Sweden
| | - Nick Geukens
- PharmAbs, The KU Leuven Antibody Center, KU Leuven, Herestraat 49, Leuven 3000, Belgium
| | - Karen Vanhoorelbeke
- Laboratory for Thrombosis Research, IRF Life Sciences, KU Leuven Campus Kulak Kortrijk, Etienne Sabbelaan 53, Kortrijk 8500, Belgium
| | - Mats Nilsson
- Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Tomtebodavägen 23B, Solna 171 65, Sweden
| | - Jeroen Lammertyn
- Department of Biosystems, Biosensors Group, KU Leuven, Willem De Croylaan 42, Heverlee B-3001, Belgium
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2
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Kinslow JD, Blum LK, Deane KD, Demoruelle MK, Okamoto Y, Parish MC, Kongpachith S, Lahey LJ, Norris JM, Robinson WH, Holers VM. Elevated IgA Plasmablast Levels in Subjects at Risk of Developing Rheumatoid Arthritis. Arthritis Rheumatol 2016; 68:2372-83. [PMID: 27273876 PMCID: PMC5042824 DOI: 10.1002/art.39771] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 05/24/2016] [Indexed: 12/16/2022]
Abstract
OBJECTIVE The disease process in rheumatoid arthritis (RA) starts years before the clinical diagnosis is made, and elevated levels of disease-specific autoantibodies can be detected during this period. Early responses to known or novel autoantigens likely drive the eventual production of pathogenic autoimmunity. Importantly, the presence of disease-specific autoantibodies can identify individuals who are at high risk of developing RA but who do not currently have arthritis. The goal of the current study was to characterize plasmablasts from individuals at risk of developing RA. METHODS We investigated antibody-secreting plasmablasts derived from a well-characterized cohort of individuals who were at risk of developing RA, based on RA-related serum autoantibody positivity, as compared to patients with early (<1 year) seropositive RA as well as healthy control subjects. The plasmablast antibody repertoires of at-risk subjects were analyzed using DNA barcode-based methods with paired heavy- and light-chain gene sequencing. Cells were single-cell sorted, the cell- and plate-specific DNA barcodes were sequentially added, and next-generation sequencing was performed. RESULTS Total plasmablast levels were similar in the antibody-positive (1%) and control (0.4-1.6%) groups. However, increased frequencies of IgA+ versus IgG+ plasmablasts were observed in the antibody-positive group (39% IgA+ and 37% IgG+) as compared to other groups (1-9% IgA+ and 71-87% IgG+). Paired antibody sequences from antibody-positive subjects revealed cross-isotype clonal families and similar sequence characteristics in the IgA and IgG plasmablast repertoires. Antibody-positive individuals also demonstrated elevated serum levels of IgA isotype anti-cyclic citrullinated peptide 3 antibodies. CONCLUSION The IgA plasmablast dominance in these antibody-positive individuals suggests that a subset of RA-related autoantibodies may arise from mucosal immune responses and may be involved in early disease pathogenesis in individuals who are at risk of developing RA.
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Affiliation(s)
| | - Lisa K Blum
- Stanford University, Stanford, California, and VA Palo Alto Health Care System, Palo Alto, California
| | | | | | - Yuko Okamoto
- University of Colorado School of Medicine, Aurora
| | | | - Sarah Kongpachith
- Stanford University, Stanford, California, and VA Palo Alto Health Care System, Palo Alto, California
| | - Lauren J Lahey
- Stanford University, Stanford, California, and VA Palo Alto Health Care System, Palo Alto, California
| | - Jill M Norris
- Colorado School of Public Health and University of Colorado, Aurora
| | - William H Robinson
- Stanford University, Stanford, California, and VA Palo Alto Health Care System, Palo Alto, California
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3
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Sokolove J, Wagner CA, Lahey LJ, Sayles H, Duryee MJ, Reimold AM, Kerr G, Robinson WH, Cannon GW, Thiele GM, Mikuls TR. Increased inflammation and disease activity among current cigarette smokers with rheumatoid arthritis: a cross-sectional analysis of US veterans. Rheumatology (Oxford) 2016; 55:1969-1977. [PMID: 27477806 DOI: 10.1093/rheumatology/kew285] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 06/24/2016] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES Cigarette smoking is a major risk factor for RA and has been associated with increased disease severity and lower rates of disease remission. We hypothesized that inflammation and disease activity would be associated with smoking status and this would be related to levels of ACPA. METHODS RA patients from the Veterans Affairs RA registry were studied (n = 1466): 76.9% anti-CCP2 positive, 89% male, median age 63 years (interquartile range 57-72), median disease duration 8.45 years (interquartile range 2.8-18). Baseline serum samples were evaluated for levels of anti-CCP2, RF, 19 distinct ACPAs and 17 cytokines. Smoking status at baseline was recorded as current, former or never. The association of smoking status with cytokines, autoantibodies and disease activity (DAS28) was evaluated. RESULTS Among anti-CCP-positive RA patients, RA-associated cytokines (false-discovery rates q < 0.1%) and DAS28 (P < 0.01) were higher in current smokers compared with former or never smokers. DAS28 and cytokine levels were similar between former and never smokers. In contrast, ACPA concentrations were higher among both current and former smokers compared with never smokers, and levels of ACPA were not associated with DAS28 or cytokine levels. CONCLUSION Among anti-CCP2-positive RA patients, current smoking status is associated with elevations in pro-inflammatory cytokines and increased RA disease activity. Similar levels of inflammation and disease activity among former and never smokers suggests that the detrimental effects of smoking could be ameliorated through tobacco cessation. The effect of tobacco cessation on RA disease activity should be evaluated prospectively.
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Affiliation(s)
- Jeremy Sokolove
- VA Palo Alto Health Care System .,Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, CA
| | - Catriona A Wagner
- VA Palo Alto Health Care System.,Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, CA
| | - Lauren J Lahey
- VA Palo Alto Health Care System.,Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, CA
| | - Harlan Sayles
- VA Nebraska Western-Iowa Health Care System.,Nebraska Arthritis Outcomes Research Center, University of Nebraska Medical Center, Omaha, NE
| | - Michael J Duryee
- VA Nebraska Western-Iowa Health Care System.,Nebraska Arthritis Outcomes Research Center, University of Nebraska Medical Center, Omaha, NE
| | - Andreas M Reimold
- Dallas VA Medical Center.,Division of Rheumatic Diseases, University of Texas Southwestern University Medical Center, Dallas, TX
| | - Gail Kerr
- DC VA Medical Center.,Division of Rheumatology, Georgetown University.,Division of Rheumatology, Howard University, Washington, DC
| | - William H Robinson
- VA Palo Alto Health Care System.,Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, CA
| | - Grant W Cannon
- George E. Wahlen VA Medical Center.,Division of Rheumatology, University of Utah Health Care, Salt Lake City, UT, USA
| | - Geoffrey M Thiele
- VA Nebraska Western-Iowa Health Care System.,Nebraska Arthritis Outcomes Research Center, University of Nebraska Medical Center, Omaha, NE
| | - Ted R Mikuls
- VA Nebraska Western-Iowa Health Care System.,Nebraska Arthritis Outcomes Research Center, University of Nebraska Medical Center, Omaha, NE
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4
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Crowley JT, Strle K, Drouin EE, Pianta A, Arvikar SL, Wang Q, Costello CE, Steere AC. Matrix metalloproteinase-10 is a target of T and B cell responses that correlate with synovial pathology in patients with antibiotic-refractory Lyme arthritis. J Autoimmun 2016; 69:24-37. [PMID: 26922382 DOI: 10.1016/j.jaut.2016.02.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 01/26/2016] [Accepted: 02/11/2016] [Indexed: 10/22/2022]
Abstract
Infection-induced autoimmunity is thought to be a contributing factor in antibiotic-refractory Lyme arthritis, but studies of autoimmunity have been hindered by difficulty in identifying relevant autoantigens. We developed a novel approach that begins with the identification of T cell epitopes in synovial tissue using tandem mass spectrometry. Herein, we identified an immunogenic HLA-DR-presented peptide (T cell epitope) derived from the source protein matrix metalloproteinase-10 (MMP-10) from the synovium of a patient with antibiotic-refractory arthritis. This finding provided a bridge for the identification of autoantibody responses to MMP-10, the "first autoimmune hit" in a subgroup of patients with erythema migrans, the initial skin lesion of the infection. Months later, after priming of the immune response to MMP-10 in early infection, a subset of patients with antibiotic-responsive or antibiotic-refractory arthritis had MMP-10 autoantibodies, but only patients with antibiotic-refractory arthritis had both T and B cell responses to the protein, providing evidence for a "second autoimmune hit". Further support for a biologically relevant autoimmune event was observed by the positive correlation of anti-MMP-10 autoantibodies with distinct synovial pathology. This experience demonstrates the power of new, discovery-based methods to identify relevant autoimmune responses in chronic inflammatory forms of arthritis.
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Affiliation(s)
- Jameson T Crowley
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States.
| | - Klemen Strle
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Elise E Drouin
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Annalisa Pianta
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Sheila L Arvikar
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Qi Wang
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA, United States
| | - Catherine E Costello
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA, United States
| | - Allen C Steere
- Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
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5
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Robinson WH, Mao R. Decade in review-technology: Technological advances transforming rheumatology. Nat Rev Rheumatol 2015; 11:626-8. [PMID: 26439404 DOI: 10.1038/nrrheum.2015.137] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- William H Robinson
- Division of Immunology and Rheumatology, CCSR 4135, 269 Campus Drive, Stanford, CA 94305, USA
| | - Rong Mao
- Division of Immunology and Rheumatology, CCSR 4135, 269 Campus Drive, Stanford, CA 94305, USA
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6
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Pianta A, Drouin EE, Crowley JT, Arvikar S, Strle K, Costello CE, Steere AC. Annexin A2 is a target of autoimmune T and B cell responses associated with synovial fibroblast proliferation in patients with antibiotic-refractory Lyme arthritis. Clin Immunol 2015; 160:336-41. [PMID: 26187145 DOI: 10.1016/j.clim.2015.07.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 07/06/2015] [Indexed: 01/12/2023]
Abstract
In this study, autoantibody responses to annexin A2 were found in 11-15% of 278 patients with Lyme disease, including in those with erythema migrans (EM), an early sign of the illness, and in those with antibiotic-responsive or antibiotic-refractory Lyme arthritis (LA), a late disease manifestation. In contrast, robust T cell reactivity to annexin A2 peptides was found only in patients with responsive or refractory LA. In LA patients, annexin A2 protein levels, which were higher in the refractory group, correlated with annexin A2 antibody levels in sera and synovial fluid. In addition, in patients with antibiotic-refractory LA who had anti-annexin A2 antibodies, synovial tissue had intense staining for annexin A2 protein, greater synovial fibroblast proliferation and more tissue fibrosis. Thus, a subset of LA patients had T and B cell responses to annexin A2, and in the refractory group, annexin A2 autoantibodies were associated with specific pathologic findings.
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Affiliation(s)
- Annalisa Pianta
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States.
| | - Elise E Drouin
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States
| | - Jameson T Crowley
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States
| | - Sheila Arvikar
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States
| | - Klemen Strle
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States
| | - Catherine E Costello
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, United States
| | - Allen C Steere
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, United States
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7
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Wine Y, Horton AP, Ippolito GC, Georgiou G. Serology in the 21st century: the molecular-level analysis of the serum antibody repertoire. Curr Opin Immunol 2015; 35:89-97. [PMID: 26172290 DOI: 10.1016/j.coi.2015.06.009] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/22/2015] [Accepted: 06/22/2015] [Indexed: 12/11/2022]
Abstract
The ensemble of antibodies found in serum and secretions represents the key adaptive component of B-cell mediated humoral immunity. The antibody repertoire is shaped by the historical record of exposure to exogenous factors such as pathogens and vaccines, as well as by endogenous host-intrinsic factors such as genetics, self-antigens, and age. Thanks to very recent technology advancements it is now becoming possible to identify and quantify the individual antibodies comprising the serological repertoire. In parallel, the advent of high throughput methods for antigen and immunosignature discovery opens up unprecedented opportunities to transform our understanding of numerous key questions in adaptive humoral immunity, including the nature and dynamics of serological memory, the role of polyspecific antibodies in health and disease and how protective responses to infections or vaccine challenge arise. Additionally, these technologies also hold great promise for therapeutic antibody and biomarker discovery in a variety of settings.
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Affiliation(s)
- Yariv Wine
- Department of Molecular Microbiology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Andrew P Horton
- Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA; Center for Systems and Synthetic Biology, University of Texas at Austin, Austin, TX, USA
| | - Gregory C Ippolito
- Department of Molecular Biosciences, University of Texas at Austin, Austin, TX, USA
| | - George Georgiou
- Department of Chemical Engineering, University of Texas at Austin, Austin, TX, USA; Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, USA; Department of Molecular Biosciences, University of Texas at Austin, Austin, TX, USA; Institute for Cell and Molecular Biology, University of Texas at Austin, Austin, TX, USA.
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8
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Sokolove J, Johnson DS, Lahey LJ, Wagner CA, Cheng D, Thiele GM, Michaud K, Sayles H, Reimold AM, Caplan L, Cannon GW, Kerr G, Mikuls TR, Robinson WH. Rheumatoid factor as a potentiator of anti-citrullinated protein antibody-mediated inflammation in rheumatoid arthritis. Arthritis Rheumatol 2014; 66:813-21. [PMID: 24757134 DOI: 10.1002/art.38307] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 12/03/2013] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The co-occurrence of rheumatoid factor (RF) and anti-citrullinated protein antibody (ACPA) positivity in rheumatoid arthritis (RA) is well described. However, the mechanisms underlying the potential interaction between these 2 distinct autoantibodies have not been well defined. The aim of this study was to evaluate the epidemiologic and molecular interaction of ACPAs and RF and its association with both disease activity and measures of RA-associated inflammation. METHODS In a cohort of 1,488 US veterans with RA, measures of disease activity and serum levels of cytokines and multiplex ACPAs were compared between the following groups of patients: double-negative (anti-cyclic citrullinated peptide [anti-CCP]-/RF-), anti-CCP+/RF-, anti-CCP-/RF+, or double-positive (anti-CCP+/RF+). Additional studies were performed using an in vitro immune complex (IC) stimulation assay in which macrophages were incubated with ACPA ICs in the presence or absence of monoclonal IgM-RF, and tumor necrosis factor α production measured as a readout of macrophage activation. RESULTS Compared with the double-negative subgroup (as well as each single-positive subgroup), the double-positive subgroup exhibited higher disease activity as well as higher levels of C-reactive protein and inflammatory cytokines (all P < 0.001). In vitro stimulation of macrophages by ACPA ICs increased cytokine production, and the addition of monoclonal IgM-RF significantly increased macrophage tumor necrosis factor α production (P = 0.003 versus ACPA ICs alone). CONCLUSION The combined presence of ACPAs and IgM-RF mediates increased proinflammatory cytokine production in vitro and is associated with increased systemic inflammation and disease activity in RA. Our data suggest that IgM-RF enhances the capacity of ACPA ICs to stimulate macrophage cytokine production, thereby providing a mechanistic link by which RF enhances the pathogenicity of ACPA ICs in RA.
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Affiliation(s)
- Jeremy Sokolove
- VA Palo Alto Health Care System, Palo Alto, California, and Stanford University School of Medicine, Stanford, California
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9
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Shelef MA, Sokolove J, Lahey LJ, Wagner CA, Sackmann EK, Warner TF, Wang Y, Beebe DJ, Robinson WH, Huttenlocher A. Peptidylarginine deiminase 4 contributes to tumor necrosis factor α-induced inflammatory arthritis. Arthritis Rheumatol 2014; 66:1482-91. [PMID: 24497204 PMCID: PMC4148484 DOI: 10.1002/art.38393] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 01/30/2014] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Peptidylarginine deiminase 4 (PAD4) is a citrullinating enzyme that has multiple associations with inflammation. In rheumatoid arthritis, PAD4 and protein citrullination are increased in inflamed joints, and anti-citrullinated protein antibodies (ACPAs) form against citrullinated antigens are formed. ACPA immune complexes can deposit in the joint and induce the production of tumor necrosis factor α (TNFα), a critical inflammatory cytokine in the pathogenesis of rheumatoid arthritis. Further, in other settings, TNFα has been shown to induce PAD4 activity and modulate antibody formation. We undertook this study to investigate whether TNFα and PAD4 may synergistically exacerbate autoantibody production and inflammatory arthritis. METHODS To determine whether TNFα and PAD4 augment autoantibody production and inflammatory arthritis, we first used a multiplex assay to determine whether mice with chronic inflammatory arthritis due to overexpression of TNFα develop autoantibodies against native and citrullinated antigens. With TNF(+) PAD4(+/+) and TNF(+) PAD4(-/-) mice, we then compared serum autoantibody levels by multiplex array, lymphocyte activation by flow cytometry, total serum IgG levels by enzyme-linked immunosorbent assay, arthritis by clinical and histologic scoring, and systemic inflammation using microfluidic devices. RESULTS TNFα-overexpressing mice had increased levels of autoantibodies reactive against native and citrullinated antigens. PAD4(-/-) mice with TNFα-induced arthritis had lower levels of autoantibodies reactive against native and citrullinated antigens, decreased T cell activation and total IgG levels, and reduced inflammation and arthritis compared to PAD4(+/+) TNFα-overexpressing mice. CONCLUSION PAD4 mediates autoantibody production and inflammatory arthritis downstream of TNFα.
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Affiliation(s)
- Miriam A. Shelef
- University of Wisconsin–Madison and William S. Middleton Memorial VA Hospital, Madison, Wisconsin
| | - Jeremy Sokolove
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | - Lauren J. Lahey
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | - Catriona A. Wagner
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | | | | | | | | | - William H. Robinson
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
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10
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Keith RC, Sokolove J, Edelman BL, Lahey L, Redente EF, Holers VM, Sakaguchi S, Robinson WH, Riches DWH. Testosterone is protective in the sexually dimorphic development of arthritis and lung disease in SKG mice. ACTA ACUST UNITED AC 2013; 65:1487-93. [PMID: 23529475 DOI: 10.1002/art.37943] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 03/14/2013] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Rheumatoid arthritis (RA) is a sexually dimorphic inflammatory autoimmune disease with both articular and extraarticular disease manifestations, including RA-associated interstitial lung disease. Low levels of testosterone have been linked to disease severity in men with RA, and supplemental testosterone has been shown to improve RA symptoms in both postmenopausal women and men with low levels of testosterone. The mechanisms by which sex and sex steroids affect the immune system and autoimmunity are poorly understood. The purpose of this study was to examine the protective effects of testicular-derived sex hormones on the development of joint and lung disease in an autoimmune mouse model. METHODS Arthritis prevalence and severity were assessed in orchiectomized, sham-orchiectomized, and intact male SKG mice as well as in female SKG mice over a 12-week period after intraperitoneal injection of zymosan. Lung tissues were evaluated by quantifying cellular accumulation in bronchoalveolar lavage fluid, collagen levels, and histologic changes. An antigen microarray was used to evaluate autoantibody generation under each experimental condition. RESULTS Female SKG mice developed arthritis and lung disease at increased prevalence and severity as compared to intact male mice. The absence of testosterone after orchiectomy led to increased arthritis, lung disease, and autoantibody generation in orchiectomized male mice as compared to intact male mice. CONCLUSION SKG mice represent an authentic sexually dimorphic mouse model of both the joint and lung disease seen in humans with RA. Testosterone protects against the development of joint and lung disease in male SKG mice.
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