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Bohat R, Liang X, Chen Y, Xu C, Zheng N, Guerrero A, Hou J, Jaffery R, Egan NA, Li Y, Tang Y, Unsal E, Robles A, Chen S, Major AM, Elldakli H, Chung SH, Liang H, Hicks MJ, Du Y, Lin JS, Chen X, Mohan C, Peng W. Fas lpr gene dosage tunes the extent of lymphoproliferation and T cell differentiation in lupus. Clin Immunol 2024; 258:109874. [PMID: 38113962 DOI: 10.1016/j.clim.2023.109874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 11/23/2023] [Accepted: 12/13/2023] [Indexed: 12/21/2023]
Abstract
Sle1 and Faslpr are two lupus susceptibility loci that lead to manifestations of systemic lupus erythematosus. To evaluate the dosage effects of Faslpr in determining cellular and serological phenotypes associated with lupus, we developed a new C57BL/6 (B6) congenic lupus strain, B6.Sle1/Sle1.Faslpr/+ (Sle1homo.lprhet) and compared it with B6.Faslpr/lpr (lprhomo), B6.Sle1/Sle1 (Sle1homo), and B6.Sle1/Sle1.Faslpr/lpr (Sle1homo.lprhomo) strains. Whereas Sle1homo.lprhomo mice exhibited profound lymphoproliferation and early mortality, Sle1homo.lprhet mice had a lifespan comparable to B6 mice, with no evidence of splenomegaly or lymphadenopathy. Compared to B6 monogenic lupus strains, Sle1homo.lprhet mice exhibited significantly elevated serum ANA antibodies and increased proteinuria. Additionally, Sle1homo.lprhet T cells had an increased propensity to differentiate into Th1 cells. Gene dose effects of Faslpr were noted in upregulating serum IL-1⍺, IL-2, and IL-27. Taken together, Sle1homo.lprhet strain is a new C57BL/6-based model of lupus, ideal for genetic studies, autoantibody repertoire investigation, and for exploring Th1 effector cell skewing without early-age lymphoproliferative autoimmunity.
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Affiliation(s)
- Ritu Bohat
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Xiaofang Liang
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Yanping Chen
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, United States of America
| | - Chunyu Xu
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Ningbo Zheng
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Ashley Guerrero
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Jiakai Hou
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Roshni Jaffery
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Nicholas A Egan
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Yaxi Li
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, United States of America
| | - Yitao Tang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America; UTHealth Graduate School of Biomedical Sciences, The University of Texas MD Anderson, Houston, TX 77030, United States of America
| | - Esra Unsal
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Adolfo Robles
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Si Chen
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Angela M Major
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, United States of America
| | - Hadil Elldakli
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Sang-Hyuk Chung
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America
| | - Han Liang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America; Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America
| | - M John Hicks
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030, United States of America
| | - Yong Du
- Department of Cellular & Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033, United States of America
| | - Jamie S Lin
- Section of Nephrology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, United States of America
| | - Xiqun Chen
- Department of Neurology, Mass General Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, United States of America; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, United States of America
| | - Chandra Mohan
- Department of Biomedical Engineering, University of Houston, Houston, TX 77204, United States of America; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, United States of America
| | - Weiyi Peng
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, United States of America; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, United States of America.
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Ferri DM, Nassar C, Manion KP, Kim M, Baglaenko Y, Muñoz-Grajales C, Wither JE. Elevated Levels of Interferon-α Act Directly on B Cells to Breach Multiple Tolerance Mechanisms Promoting Autoantibody Production. Arthritis Rheumatol 2023; 75:1542-1555. [PMID: 36807718 DOI: 10.1002/art.42482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 01/16/2023] [Accepted: 02/14/2023] [Indexed: 02/23/2023]
Abstract
OBJECTIVE Elevated levels of serum interferon-α (IFNα) and the disruption of B cell tolerance are central to systemic lupus erythematosus (SLE) immunopathogenesis; however, the relationship between these 2 processes remains unclear. The purpose of this study was to investigate the impact of elevated IFNα levels on B cell tolerance mechanisms in vivo and determine whether any changes observed were due to the direct effect of IFNα on B cells. METHODS Two classical mouse models of B cell tolerance were used in conjunction with an adenoviral vector encoding IFNα to mimic the sustained elevations of IFNα seen in SLE. The role of B cell IFNα signaling, T cells, and Myd88 signaling was determined using B cell-specific IFNα receptor-knockout, CD4+ T cell-depleted, or Myd88-knockout mice, respectively. Flow cytometry, enzyme-linked immunosorbent assay, real-time quantitative polymerase chain reaction, and cell cultures were used to study the effects of elevated IFNα on the immunologic phenotype. RESULTS Elevation of serum IFNα disrupts multiple B cell tolerance mechanisms and leads to autoantibody production. This disruption was dependent upon B cell expression of IFNα receptor. Many of the IFNα-mediated alterations also required the presence of CD4+ T cells as well as Myd88, suggesting that IFNα acts directly on B cells to modify their response to Myd88 signaling and their ability to interact with T cells. CONCLUSION The results provide evidence that elevated IFNα levels act directly on B cells to facilitate autoantibody production and further highlight the importance of IFN signaling as a potential therapeutic target in SLE.
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Affiliation(s)
- Dario M Ferri
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Carol Nassar
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Kieran P Manion
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Michael Kim
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Yuriy Baglaenko
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Carolina Muñoz-Grajales
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Joan E Wither
- Schroeder Arthritis Institute, Krembil Research Institute, and Division of Rheumatology, Schroeder Arthritis Institute, University Health Network, and Departments of Medicine and Immunology, University of Toronto, Toronto, Ontario, Canada
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Sweet RA, Nickerson KM, Cullen JL, Wang Y, Shlomchik MJ. B Cell-Extrinsic Myd88 and Fcer1g Negatively Regulate Autoreactive and Normal B Cell Immune Responses. THE JOURNAL OF IMMUNOLOGY 2017; 199:885-893. [PMID: 28659358 DOI: 10.4049/jimmunol.1600861] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 05/30/2017] [Indexed: 01/01/2023]
Abstract
MyD88 and FcR common γ-chain (Fcer1g, FcRγ) elicit proinflammatory responses to exogenous Ags. Deletion of these receptors in autoimmune models has generally led to reduced overall disease. In B cells, Myd88 is required for anti-DNA and anti-RNA autoantibody responses, whereas Fcer1g is not expressed in these cells. The roles of these receptors in myeloid cells during B cell autoimmune activation remain less clear. To investigate the roles of Myd88 and Fcer1g in non-B cells, we transferred anti-self-IgG (rheumatoid factor) B cells and their physiologic target Ag, anti-chromatin Ab, into mice lacking Fcer1g, Myd88, or both and studied the extrafollicular plasmablast response. Surprisingly, we found a markedly higher and more prolonged response in the absence of either molecule; this effect was accentuated in doubly deficient recipients, with a 40-fold increase compared with wild-type recipients at day 10. This enhancement was dependent on CD40L, indicating that Myd88 and FcRγ, presumably on myeloid APCs, were required to downregulate T cell help for the extrafollicular response. To extend the generality, we then investigated a classic T cell-dependent response to (4-hydroxy-3-nitrophenyl)acetyl conjugated to chicken γ globulin and found a similar effect. Thus, these results reveal novel regulatory roles in the B cell response for receptors that are typically proinflammatory.
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Affiliation(s)
- Rebecca A Sweet
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06519.,Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT 06519; and
| | - Kevin M Nickerson
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Jaime L Cullen
- Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT 06519; and
| | - Yujuan Wang
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Mark J Shlomchik
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06519; .,Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT 06519; and.,Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
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Sang A, Zheng YY, Choi SC, Zeumer L, Morel L. Genetic and cellular dissection of the activation of AM14 rheumatoid factor B cells in a mouse model of lupus. J Leukoc Biol 2015; 98:209-21. [PMID: 25957308 DOI: 10.1189/jlb.1a1214-576r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 04/09/2015] [Indexed: 11/24/2022] Open
Abstract
The RF-specific AM14 tg BCR has been used as a model to dissect the mechanisms of B cell tolerance to ICs containing nucleic acids. We have shown previously that AM14 RF B cells break tolerance in the TC mouse model of lupus through the dual engagement of the AM14 BCR and TLR9. In this study, we showed that neither the expression of Sle1 or Sle2 susceptibility loci alone was sufficient to activate AM14 RF B cells, suggesting that the production of antichromatin IgG2a(a) autoAg mediated by Sle1 and an intrinsically higher B cell activation mediated by Sle2 were required. We also showed that the B6 genetic background enhanced the selection of AM14 RF B cells to the MZB cell compartment regardless of the expression of the Sle loci and therefore, of their activation into AFCs. Furthermore, some AM14 RF B cells were selected into the B-1a compartment, where they did not differentiate into AFCs. Therefore, it is unlikely that the selection of AM14 RF B cells to the MZB or B-1a cell compartments in TC.AM14(a) mice is responsible for their breach of tolerance. Finally, we showed that the presence of expression of Sle1 in non-tg cells, most likely T cells, is necessary for the activation of AM14 RF B cells into AFCs. Overall, these results suggest a threshold model of activation of AM14 RF B cells on the B6 background with additive genetic and cellular contribution of multiple sources.
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Affiliation(s)
- Allison Sang
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Ying Yi Zheng
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Seung-Chul Choi
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Leilani Zeumer
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Laurence Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
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