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Barrios EL, Mazer MB, McGonagill PW, Bergmann CB, Goodman MD, Gould RW, Rao M, Polcz VE, Davis RJ, Del Toro DE, Dirain ML, Dram A, Hale LO, Heidarian M, Kim CY, Kucaba TA, Lanz JP, McCray AE, Meszaros S, Miles S, Nelson CR, Rocha IL, Silva EE, Ungaro RF, Walton AH, Xu J, Zeumer-Spataro L, Drewry AM, Liang M, Bible LE, Loftus TJ, Turnbull IR, Efron PA, Remy KE, Brakenridge SC, Badovinac VP, Griffith TS, Moldawer LL, Hotchkiss RS, Caldwell CC. Adverse outcomes and an immunosuppressed endotype in septic patients with reduced IFN-γ ELISpot. JCI Insight 2024; 9:e175785. [PMID: 38100268 PMCID: PMC10906237 DOI: 10.1172/jci.insight.175785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 11/30/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUNDSepsis remains a major clinical challenge for which successful treatment requires greater precision in identifying patients at increased risk of adverse outcomes requiring different therapeutic approaches. Predicting clinical outcomes and immunological endotyping of septic patients generally relies on using blood protein or mRNA biomarkers, or static cell phenotyping. Here, we sought to determine whether functional immune responsiveness would yield improved precision.METHODSAn ex vivo whole-blood enzyme-linked immunosorbent spot (ELISpot) assay for cellular production of interferon γ (IFN-γ) was evaluated in 107 septic and 68 nonseptic patients from 5 academic health centers using blood samples collected on days 1, 4, and 7 following ICU admission.RESULTSCompared with 46 healthy participants, unstimulated and stimulated whole-blood IFN-γ expression was either increased or unchanged, respectively, in septic and nonseptic ICU patients. However, in septic patients who did not survive 180 days, stimulated whole-blood IFN-γ expression was significantly reduced on ICU days 1, 4, and 7 (all P < 0.05), due to both significant reductions in total number of IFN-γ-producing cells and amount of IFN-γ produced per cell (all P < 0.05). Importantly, IFN-γ total expression on days 1 and 4 after admission could discriminate 180-day mortality better than absolute lymphocyte count (ALC), IL-6, and procalcitonin. Septic patients with low IFN-γ expression were older and had lower ALCs and higher soluble PD-L1 and IL-10 concentrations, consistent with an immunosuppressed endotype.CONCLUSIONSA whole-blood IFN-γ ELISpot assay can both identify septic patients at increased risk of late mortality and identify immunosuppressed septic patients.TRIAL REGISTRYN/A.FUNDINGThis prospective, observational, multicenter clinical study was directly supported by National Institute of General Medical Sciences grant R01 GM-139046, including a supplement (R01 GM-139046-03S1) from 2022 to 2024.
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Affiliation(s)
- Evan L. Barrios
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Monty B. Mazer
- Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Patrick W. McGonagill
- Department of Surgery, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Christian B. Bergmann
- Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
- University Hospital Ulm, Clinic for Trauma Surgery, Hand, Plastic, and Reconstructive Surgery Albert-Einstein-Allee 23, Ulm, Germany
| | - Michael D. Goodman
- Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Robert W. Gould
- Department of Anesthesiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Mahil Rao
- Department of Pediatrics, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Valerie E. Polcz
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Ruth J. Davis
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Drew E. Del Toro
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Marvin L.S. Dirain
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Alexandra Dram
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Lucas O. Hale
- Department of Anesthesiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Mohammad Heidarian
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Caleb Y. Kim
- Department of Urology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Tamara A. Kucaba
- Department of Urology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Jennifer P. Lanz
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Ashley E. McCray
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Sandra Meszaros
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Sydney Miles
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Candace R. Nelson
- Department of Anesthesiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Ivanna L. Rocha
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Elvia E. Silva
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Ricardo F. Ungaro
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Andrew H. Walton
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Julie Xu
- Department of Urology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Leilani Zeumer-Spataro
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Anne M. Drewry
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Muxuan Liang
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
- Department of Biostatistics, University of Florida College of Public Health and Health Professions and the University of Florida College of Medicine, Gainesville, Florida, USA
| | - Letitia E. Bible
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Tyler J. Loftus
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Isaiah R. Turnbull
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Philip A. Efron
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Kenneth E. Remy
- Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Scott C. Brakenridge
- Department of Surgery, Harborview Medical Center, University of Washington School of Medicine, Seattle, Washington, USA
| | - Vladimir P. Badovinac
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
- Experimental Pathology PhD Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Thomas S. Griffith
- Department of Urology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Center for Immunology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
- Minneapolis VA Healthcare System, Minneapolis, Minnesota, USA
| | - Lyle L. Moldawer
- Sepsis and Critical Illness Research Center, Department of Surgery, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Richard S. Hotchkiss
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Charles C. Caldwell
- Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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Barrios EA, Mazer MB, McGonagill P, Bergmann CB, Goodman MD, Gould R, Rao M, Polcz V, Davis R, Del Toro D, Dirain M, Dram A, Hale L, Heidarian M, Kucaba TA, Lanz JP, McCray A, Meszaros S, Miles S, Nelson C, Rocha I, Silva EE, Ungaro R, Walton A, Xu J, Zeumer-Spataro L, Drewry A, Liang M, Bible LE, Loftus T, Turnbull I, Efron PA, Remy KE, Brakenridge S, Badovinac VP, Griffith TS, Moldawer LL, Hotchkiss RS, Caldwell CC. Adverse Long-Term Outcomes and an Immune Suppressed Endotype in Sepsis Patients with Reduced Interferon-γELISpot: A Multicenter, Prospective Observational Study. medRxiv 2023:2023.09.13.23295360. [PMID: 37745385 PMCID: PMC10516075 DOI: 10.1101/2023.09.13.23295360] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
BACKGROUND Sepsis remains a major clinical challenge for which successful treatment requires greater precision in identifying patients at increased risk of adverse outcomes requiring different therapeutic approaches. Predicting clinical outcomes and immunological endotyping of septic patients has generally relied on using blood protein or mRNA biomarkers, or static cell phenotyping. Here, we sought to determine whether functional immune responsiveness would yield improved precision. METHODS An ex vivo whole blood enzyme-linked immunosorbent (ELISpot) assay for cellular production of interferon-γ (IFN-γ) was evaluated in 107 septic and 68 non-septic patients from five academic health centers using blood samples collected on days 1, 4 and 7 following ICU admission. RESULTS Compared with 46 healthy subjects, unstimulated and stimulated whole blood IFNγ expression were either increased or unchanged, respectively, in septic and nonseptic ICU patients. However, in septic patients who did not survive 180 days, stimulated whole blood IFNγ expression was significantly reduced on ICU days 1, 4 and 7 (all p<0.05), due to both significant reductions in total number of IFNγ producing cells and amount of IFNγ produced per cell (all p<0.05). Importantly, IFNγ total expression on day 1 and 4 after admission could discriminate 180-day mortality better than absolute lymphocyte count (ALC), IL-6 and procalcitonin. Septic patients with low IFNγ expression were older and had lower ALC and higher sPD-L1 and IL-10 concentrations, consistent with an immune suppressed endotype. CONCLUSIONS A whole blood IFNγ ELISpot assay can both identify septic patients at increased risk of late mortality, and identify immune-suppressed, sepsis patients.
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Park YP, Roach T, Soh S, Zeumer-Spataro L, Choi SC, Ostrov DA, Yang Y, Morel L. Molecular Mechanisms of Lupus Susceptibility Allele PBX1D. J Immunol 2023; 211:727-734. [PMID: 37486226 PMCID: PMC10530199 DOI: 10.4049/jimmunol.2300362] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 07/03/2023] [Indexed: 07/25/2023]
Abstract
Pre-B cell leukemia homeobox 1 (PBX1) controls chromatin accessibility to a large number of genes in various cell types. Its dominant negative splice isoform, PBX1D, which lacks the DNA and Hox-binding domains, is expressed more frequently in the CD4+ T cells from lupus-prone mice and patients with systemic lupus erythematosus than healthy control subjects. PBX1D overexpression in CD4+ T cells impaired regulatory T cell homeostasis and expanded inflammatory CD4+ T cells. In this study, we showed that PBX1 message expression is downregulated by activation in CD4+ T cells as well as in B cells. PBX1D protein was less stable than the normal isoform, PBX1B, and it is degraded through the ubiquitin-proteasome-dependent pathway. The DNA binding domain lacking in PBX1D has two putative ubiquitin binding sites, K292 and K293, that are predicted to be in direct contact with DNA. Mutation of K292-293 reduced PBX1B stability to a level similar to PBX1D and abrogated DNA binding. In addition, contrary to PBX1B, PBX1D is retained in the cytoplasm without the help of the cofactors MEIS or PREP1, indicating a different requirement for nuclear translocation. Overall, these findings suggest that multiple post-transcriptional mechanisms are responsible for PBX1D loss of function and induction of CD4+ T cell inflammatory phenotypes in systemic lupus erythematosus.
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Affiliation(s)
- Yuk Pheel Park
- Department of Microbiology, Immunology, and Molecular Genetics, University of Texas Health San Antonio, TX 78229-3900, USA
| | - Tracoyia Roach
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, College of Medicine, Gainesville, FL32610, USA
| | - Sujung Soh
- Research Institute of Women’s Health, Sookmyung Women’s University, 100 Cheongparo 47-gil, Yongsan-Gu, Seoul 04310, South Korea, USA
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, College of Medicine, Gainesville, FL32610, USA
| | - Seung-Chul Choi
- Department of Microbiology, Immunology, and Molecular Genetics, University of Texas Health San Antonio, TX 78229-3900, USA
| | - David A. Ostrov
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, College of Medicine, Gainesville, FL32610, USA
| | - Young Yang
- Research Institute of Women’s Health, Sookmyung Women’s University, 100 Cheongparo 47-gil, Yongsan-Gu, Seoul 04310, South Korea, USA
| | - Laurence Morel
- Department of Microbiology, Immunology, and Molecular Genetics, University of Texas Health San Antonio, TX 78229-3900, USA
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Raparia C, Quach TD, Zeumer-Spataro L, Choi SC, Yi Z, Zhang W, Morel L, Davidson A. Combination CTLA4Ig and Anti-CD40 Ligand Treatment Modifies T and B Cell Metabolic Profiles and Promotes B Cell Receptor Remodeling in a Mouse Model of Systemic Lupus Erythematosus. J Immunol 2023; 210:558-567. [PMID: 36645445 PMCID: PMC10004980 DOI: 10.4049/jimmunol.2100792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 12/15/2022] [Indexed: 01/17/2023]
Abstract
Systemic lupus erythematosus is a complex autoimmune disease with significant morbidity that demands further examination of tolerance-inducing treatments. Short-term treatment of lupus-prone NZB/WF1 mice with combination CTLA4Ig and anti-CD40 ligand, but not single treatment alone, suppresses disease for >6 mo via modulation of B and T cell function while maintaining immune responses to exogenous Ags. Three months after a 2-wk course of combination costimulatory blockade, we found a modest decrease in the number of activated T and B cells in both combination and single-treatment cohorts compared with untreated controls. However, only combination treatment mice showed a 50% decrease in spare respiratory capacity of splenic B and T cells. RNA sequencing and gene set enrichment analysis of germinal center (GC) B cells confirmed a reduction in the oxidative phosphorylation signature in the combination treatment cohort. This cohort also manifested increased expression of BCR-associated signaling molecules and increased phosphorylation of PLCγ in GC B cells after stimulation with anti-IgG and anti-CD40. GC B cells from combination treatment mice also displayed a signature involving remodeling of GPI-linked surface proteins. Accordingly, we found a decrease in cell surface expression of the inhibitory molecule CD24 on class-switched memory B cells from aged NZB/W mice that corrected in the combination treatment cohort. Because both a profound decrease in BCR signaling and remodeled immune cell metabolism enhance loss of tolerance in lupus-prone mice, our findings help to explain the restoration of tolerance observed after short-term combination costimulatory blockade.
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Affiliation(s)
- Chirag Raparia
- Institute of Molecular Medicine, Feinstein Institutes for Medical Research, Manhasset, New York, NY 11030
| | - Tam D. Quach
- Institute of Molecular Medicine, Feinstein Institutes for Medical Research, Manhasset, New York, NY 11030
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL:
| | - Seung-Chul Choi
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL:
| | - Zhengzi Yi
- Department of Medicine, Mount Sinai Medical Center, New York, NY 10029
| | - Weijia Zhang
- Department of Medicine, Mount Sinai Medical Center, New York, NY 10029
| | - Laurence Morel
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL:
| | - Anne Davidson
- Institute of Molecular Medicine, Feinstein Institutes for Medical Research, Manhasset, New York, NY 11030
- Donald and Barbara Zucker School of Medicine at Northwell Health
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Abboud G, Choi SC, Zhang X, Park YP, Kanda N, Zeumer-Spataro L, Terrell M, Teng X, Nündel K, Shlomchik MJ, Morel L. Glucose Requirement of Antigen-Specific Autoreactive B Cells and CD4+ T Cells. J Immunol 2023; 210:377-388. [PMID: 36602759 PMCID: PMC9898175 DOI: 10.4049/jimmunol.2200325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 12/05/2022] [Indexed: 01/06/2023]
Abstract
The activation of lymphocytes in patients with lupus and in mouse models of the disease is coupled with an increased cellular metabolism in which glucose plays a major role. The pharmacological inhibition of glycolysis with 2-deoxy-d-glucose (2DG) reversed the expansion of follicular helper CD4+ T cells and germinal center B cells in lupus-prone mice, as well as the production of autoantibodies. The response of foreign Ags was however not affected by 2DG in these mice, suggesting that B and CD4+ T cell activation by autoantigens is uniquely sensitive to glycolysis. In this study, we tested this hypothesis with monoclonal B cells and CD4+ T cells specific for lupus-relevant autoantigens. AM14 Vκ8R (AM14) transgenic B cells are activated by IgG2a/chromatin immune complexes and they can receive cognate help from chromatin-specific 13C2 CD4+ T cells. We showed that activation of AM14 B cells by their cognate Ag PL2-3 induced glycolysis, and that the inhibition of glycolysis reduced their activation and differentiation into Ab-forming cells, in the absence or presence of T cell help. The dependency of autoreactive B cells on glycolysis is in sharp contrast with the previously reported dependency of 4-hydroxy-3-nitrophenyl acetyl-specific B cells on fatty acid oxidation. Contrary to AM14 B cells, the activation and differentiation of 13C2 T cells into follicular helper CD4+ T cells was not altered by 2DG, which differs from polyclonal CD4+ T cells from lupus-prone mice. These results further define the role of glycolysis in the production of lupus autoantibodies and demonstrate the need to evaluate the metabolic requirements of Ag-specific B and T cells.
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Affiliation(s)
- Georges Abboud
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Seung-Chul Choi
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Xiaojuan Zhang
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Yuk Pheel Park
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Nathalie Kanda
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Morgan Terrell
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Xiangyu Teng
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Kirsten Nündel
- Department of Medicine, Division of Rheumatology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Mark J. Shlomchik
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Laurence Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
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Terrell ML, Elshikha AS, Kanda N, Brown J, Zeumer-Spataro L, Morel L. Treatment with TLR7/8 agonist compromises intestinal epithelium integrity in a lupus prone mouse model. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.158.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the production of autoantibodies leading to chronic inflammation and subsequent organ damage. Both spontaneous and induced mouse models have been central to the dissection of disease mechanisms. Mounting evidence suggests that increased gut permeability, or leaky gut, and the resulting translocation of pathobionts or their metabolites can impact SLE pathogenesis. Resiquimod (R848), a TLR7/8 agonist has been shown to induce lupus-like autoimmunity in various non-autoimmune mouse strains. Here, we examined the effect of the epicutaneous administration of R848 in the B6.Sle1.Sle2.Sle3 triple congenic (TC) spontaneous mouse model of lupus as compared to their non-autoimmune B6 controls. R848 induced a much stronger autoimmune activation in pre-autoimmune TC mice than in B6 controls. Unexpectedly, R848 decreased gut barrier integrity in TC but not in B6 mice. Immunofluorescence staining of the ileum showed a reduced expression of the tight junction protein claudin-1 and an increased infiltration of immune cells in R848-treated TC as compared to either R848-treated B6 or untreated control mice. The reduced intestinal epithelial integrity was functionally confirmed with a FITC-dextran intestinal permeability assay. These results demonstrate for the first time that TLR7/8 activation, which plays an essential role in autoimmune activation, also induces a leaky gut in lupus-prone mice. Ongoing studies are expected to unveil the causal relationships between TLR7/8 activation, gut barrier integrity, and microbial dysbiosis in SLE.
Supported by R01 AI143313 from the NIH to LM
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Affiliation(s)
- Morgan Lee Terrell
- 1Department of Pathology, Immunology and Laboratory Medicine, Univ. of Florida
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Brown J, Abboud G, Ma L, Choi SC, Kanda N, Zeumer-Spataro L, Lee J, Peng W, Cagmat J, Faludi T, Mohamadzadeh M, Garrett T, Mandik-Nayak L, Chervonsky A, Perl A, Morel L. Microbiota-mediated skewing of tryptophan catabolism modulates CD4+ T cells in lupus-prone mice. iScience 2022; 25:104241. [PMID: 35494242 PMCID: PMC9051618 DOI: 10.1016/j.isci.2022.104241] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 02/14/2022] [Accepted: 04/07/2022] [Indexed: 12/21/2022] Open
Abstract
A skewed tryptophan metabolism has been reported in patients with lupus. Here, we investigated the mechanisms by which it occurs in lupus-susceptible mice, and how tryptophan metabolites exacerbate T cell activation. Metabolomic analyses demonstrated that tryptophan is differentially catabolized in lupus mice compared to controls and that the microbiota played a role in this skewing. There was no evidence for differential expression of tryptophan catabolic enzymes in lupus mice, further supporting a major contribution of the microbiota to skewing. However, isolated lupus T cells processed tryptophan differently, suggesting a contribution of T cell intrinsic factors. Functionally, tryptophan and its microbial product tryptamine increased T cell metabolism and mTOR activation, while kynurenine promoted interferon gamma production, all of which have been associated with lupus. These results showed that a combination of microbial and T cell intrinsic factors promotes the production of tryptophan metabolites that enhance inflammatory phenotypes in lupus T cells. Intestinal dysbiosis skews tryptophan catabolism in lupus-prone mice Murine lupus CD4+ T cells have an intrinsically different processing of tryptophan Tryptophan and tryptamine increase mTOR activation and metabolism in CD4+ T cells Kynurenine promotes IFNγ production in CD4+ T cells from lupus-prone mice
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Affiliation(s)
- Josephine Brown
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Georges Abboud
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Longhuan Ma
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Seung-Chul Choi
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Nathalie Kanda
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Jean Lee
- Committee on Immunology, The University of Chicago, Chicago, IL 60637, USA
| | - Weidan Peng
- Lankenau Institute for Medical Research, Wynnewood, PA, USA
| | - Joy Cagmat
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Tamas Faludi
- Departments of Medicine, Microbiology and Immunology, Biochemistry and Molecular Biology, State University of New York, Upstate Medical University, College of Medicine, Syracuse, NY 13210, USA
| | - Mansour Mohamadzadeh
- Department of Medicine, University of Texas Health San Antonio, San Antonio, TX 78229, USA
| | - Timothy Garrett
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
| | | | | | - Andras Perl
- Departments of Medicine, Microbiology and Immunology, Biochemistry and Molecular Biology, State University of New York, Upstate Medical University, College of Medicine, Syracuse, NY 13210, USA
| | - Laurence Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA
- Corresponding author
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Choi SC, Li W, Zhang X, Kanda N, Zeumer-Spataro L, Teng X, Morel L. Pharmacologically Inferred Glycolysis and Glutaminolysis Requirement of B Cells in Lupus-Prone Mice. J Immunol 2022; 208:2098-2108. [PMID: 35387839 PMCID: PMC9050845 DOI: 10.4049/jimmunol.2100356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 02/17/2022] [Indexed: 11/19/2022]
Abstract
Several studies have shown an enhanced metabolism in the CD4+ T cells of lupus patients and lupus-prone mice. Little is known about the metabolism of B cells in lupus. In this study, we compared the metabolism of B cells between lupus-prone B6.Sle1.Sle2.Sle3 triple-congenic mice and C57BL/6 controls at steady state relative to autoantibody production, as well as during T cell-dependent (TD) and T cell-independent (TI) immunizations. Starting before the onset of autoimmunity, B cells from triple-congenic mice showed an elevated glycolysis and mitochondrial respiration, which were normalized in vivo by inhibiting glycolysis with a 2-deoxy-d-glucose (2DG) treatment. 2DG greatly reduced the production of TI-Ag-specific Abs, but showed minimal effect with TD-Ags. In contrast, the inhibition of glutaminolysis with 6-diazo-5-oxo-l-norleucine had a greater effect on TD than TI-Ag-specific Abs in both strains. Analysis of the TI and TD responses in purified B cells in vitro suggests, however, that the glutaminolysis requirement is not B cell-intrinsic. Thus, B cells have a greater requirement for glycolysis in TI than TD responses, as inferred from pharmacological interventions. B cells from lupus-prone and control mice have different intrinsic metabolic requirements or different responses toward 2DG and 6-diazo-5-oxo-l-norleucine, which mirrors our previous results obtained with follicular Th cells. Overall, these results predict that targeting glucose metabolism may provide an effective therapeutic approach for systemic autoimmunity by eliminating both autoreactive follicular Th and B cells, although it may also impair TI responses.
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Affiliation(s)
- Seung-Chul Choi
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Wei Li
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Xiaojuan Zhang
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Nathalie Kanda
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Xiangyu Teng
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Laurence Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL
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9
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Abboud G, Elshikha AS, Kanda N, Zeumer-Spataro L, Morel L. Contribution of Dendritic Cell Subsets to T Cell-Dependent Responses in Mice. J Immunol 2022; 208:1066-1075. [PMID: 35140132 PMCID: PMC8881363 DOI: 10.4049/jimmunol.2100242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 12/21/2021] [Indexed: 02/01/2023]
Abstract
BATF3-deficient mice that lack CD8+ dendritic cells (DCs) showed an exacerbation of chronic graft-versus-host disease (cGVHD), including T follicular helper (Tfh) cell and autoantibody responses, whereas mice carrying the Sle2c2 lupus-suppressive locus with a mutation in the G-CSFR showed an expansion of CD8+ DCs and a poor mobilization of plasmacytoid DCs (pDCs) and responded poorly to cGVHD induction. Here, we investigated the contribution of CD8+ DCs and pDCs to the humoral response to protein immunization, where CD8neg DCs are thought to represent the major inducers. Both BATF3-/- and Sle2c2 mice had reduced humoral and germinal center (GC) responses compared with C57BL/6 (B6) controls. We showed that B6-derived CD4+ DCs are the major early producers of IL-6, followed by CD4-CD8- DCs. Surprisingly, IL-6 production and CD80 expression also increased in CD8+ DCs after immunization, and B6-derived CD8+ DCs rescued Ag-specific adaptive responses in BATF3-/- mice. In addition, inflammatory pDCs (ipDCs) produced more IL-6 than all conventional DCs combined. Interestingly, G-CSFR is highly expressed on pDCs. G-CSF expanded pDC and CD8+ DC numbers and IL-6 production by ipDCs and CD4+ DCs, and it improved the quality of Ab response, increasing the localization of Ag-specific T cells to the GC. Finally, G-CSF activated STAT3 in early G-CSFR+ common lymphoid progenitors of cDCs/pDCs but not in mature cells. In conclusion, we showed a multilayered role of DC subsets in priming Tfh cells in protein immunization, and we unveiled the importance of G-CSFR signaling in the development and function pDCs.
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Affiliation(s)
- Georges Abboud
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Ahmed S. Elshikha
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA.,Department of Pharmaceutics, Zagazig University, Zagazig, Sharkia, 44519, Egypt
| | - Nathalie Kanda
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA
| | - Laurence Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL; and
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10
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Raparia C, Zeumer-Spataro L, Quach TD, Choi SC, Morel L, Davidson A. Costimulatory blockade modifies germinal center B cell function in NZB/W F1 mice. The Journal of Immunology 2021. [DOI: 10.4049/jimmunol.206.supp.51.04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Abstract
Systemic lupus erythematosus (SLE) is a complex autoimmune disease with significant morbidity and mortality - demanding further examination of disease reducing treatments. Previously, we showed that a 2-week course of combined CTLA4Ig and anti-CD40L costimulatory blockade prevented loss of tolerance to dsDNA in NZB/W mice while maintaining immune function against exogenous antigen, explained by an altered selection of autoreactive B cells in germinal centers (GC). Here, we examined both B and T cells to clarify if restoration of tolerance is due to a change in GC B cell profile or a decrease in T cell help. 3 months after treatment, large germinal centers persisted in the treated group, but due to smaller spleen size total GC B cells and TFH Cells were decreased compared with controls. The metabolic profile of splenic B and T cells showed a decreased spare respiratory capacity in both subsets and a decrease in B cell glycolysis among the treated group. RNA-seq analysis of GC dark zone and light zone B cells from treated mice showed decreased expression of markers of oxidative phosphorylation and cell proliferation and increased expression of signaling molecules downstream of BCR, including PLCγ, compared with untreated controls. GC B cell stimulation assays showed a delay in phosphorylation of PLCγ in response to anti-IgG in treated mice. These data show a long-lasting effect of short-term costimulatory blockade on both B and T cells with metabolic remodeling of GC B cells and an alteration of BCR signaling. Since both a profound decrease in BCR signaling and an increase in B cell glycolysis have been reported to enhance loss of tolerance in lupus prone mice, our findings help to explain the restoration of tolerance observed after treatment.
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Affiliation(s)
| | - Leilani Zeumer-Spataro
- 2Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | | | - Seung-Chul Choi
- 2Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Laurence Morel
- 2Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
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11
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Sharma J, Collins TD, Roach T, Mishra S, Lam BK, Mohamed ZS, Veal AE, Polk TB, Jones A, Cornaby C, Haider MI, Zeumer-Spataro L, Johnson HM, Morel LM, Larkin J. Suppressor of cytokine signaling-1 mimetic peptides attenuate lymphocyte activation in the MRL/lpr mouse autoimmune model. Sci Rep 2021; 11:6354. [PMID: 33737712 PMCID: PMC7973732 DOI: 10.1038/s41598-021-86017-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 03/09/2021] [Indexed: 12/30/2022] Open
Abstract
Autoimmune diseases are driven largely by a pathogenic cytokine milieu produced by aberrantly activated lymphocytes. Many cytokines, including interferon gamma (IFN-γ), utilize the JAK/STAT pathway for signal propagation. Suppressor of Cytokine Signaling-1 (SOCS1) is an inducible, intracellular protein that regulates IFN-γ signaling by dampening JAK/STAT signaling. Using Fas deficient, MRL/MpJ-Faslpr/J (MRL/lpr) mice, which develop lupus-like disease spontaneously, we tested the hypothesis that a peptide mimic of the SOCS1 kinase inhibitory region (SOCS1-KIR) would inhibit lymphocyte activation and modulate lupus-associated pathologies. Consistent with in vitro studies, SOCS1-KIR intraperitoneal administration reduced the frequency, activation, and cytokine production of memory CD8+ and CD4+ T lymphocytes within the peripheral blood, spleen, and lymph nodes. In addition, SOCS1-KIR administration reduced lymphadenopathy, severity of skin lesions, autoantibody production, and modestly reduced kidney pathology. On a cellular level, peritoneal SOCS1-KIR administration enhanced Foxp3 expression in total splenic and follicular regulatory T cells, reduced the effector memory/naïve T lymphocyte ratio for both CD4+ and CD8+ cells, and reduced the frequency of GL7+ germinal center enriched B cells. Together, these data show that SOCS1-KIR treatment reduced auto-reactive lymphocyte effector functions and suggest that therapeutic targeting of the SOCS1 pathway through peptide administration may have efficacy in mitigating autoimmune pathologies.
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Affiliation(s)
- Jatin Sharma
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Teresa D Collins
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Tracoyia Roach
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Shiwangi Mishra
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Brandon K Lam
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Zaynab Sidi Mohamed
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Antia E Veal
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Timothy B Polk
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Amari Jones
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Caleb Cornaby
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Mohammed I Haider
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Howard M Johnson
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA
| | - Laurence M Morel
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Joseph Larkin
- Department of Microbiology & Cell Science, University of Florida, Museum Road Building 981, PO Box 110700, Gainesville, FL, 32611, USA.
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12
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Li W, Elshikha AS, Cornaby C, Teng X, Abboud G, Brown J, Zou X, Zeumer-Spataro L, Robusto B, Choi SC, Fredenburg K, Major A, Morel L. T cells expressing the lupus susceptibility allele Pbx1d enhance autoimmunity and atherosclerosis in dyslipidemic mice. JCI Insight 2020; 5:138274. [PMID: 32493841 DOI: 10.1172/jci.insight.138274] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 05/06/2020] [Indexed: 12/24/2022] Open
Abstract
Patients with systemic lupus erythematosus (SLE) present a high incidence of atherosclerosis, which contributes significantly to morbidity and mortality in this autoimmune disease. An impaired balance between regulatory (Treg) and follicular helper (Tfh) CD4+ T cells is shared by both diseases. However, whether there are common mechanisms of CD4+ T cell dysregulation between SLE and atherosclerosis remains unclear. Pre-B cell leukemia transcription factor 1 isoform d (Pbx1d) is a lupus susceptibility gene that regulates Tfh cell expansion and Treg cell homeostasis. Here, we investigated the role of T cells overexpressing Pbx1d in low-density lipoprotein receptor-deficient (Ldlr-/-) mice fed with a high-fat diet, an experimental model for atherosclerosis. Pbx1d-transgenic T cells exacerbated some phenotypes of atherosclerosis, which were associated with higher autoantibody production, increased Tfh cell frequency, and impaired Treg cell regulation, in Ldlr-/- mice as compared with control T cells. In addition, we showed that dyslipidemia and Pbx1d-transgenic expression independently impaired the differentiation and function of Treg cells in vitro, suggesting a gene/environment additive effect. Thus, our results suggest that the combination of Pbx1d expression in T cells and dyslipidemia exacerbates both atherosclerosis and autoimmunity, at least in part through a dysregulation of Treg cell homeostasis.
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Affiliation(s)
- Wei Li
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Ahmed S Elshikha
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA.,Department of Pharmaceutics, Zagazig University, Zagazig, Sharkia, Egypt
| | - Caleb Cornaby
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Xiangyu Teng
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Georges Abboud
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Josephine Brown
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Xueyang Zou
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA.,Department of Immunology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Leilani Zeumer-Spataro
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Brian Robusto
- 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
| | - Kristianna Fredenburg
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
| | - Amy Major
- Department of Medicine, Division of Rheumatology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA.,U.S. Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, Tennessee, USA
| | - Laurence Morel
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, Florida, USA
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13
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Cornaby C, Zeumer-Spataro L, Choi SC, Li W, Morel L. Lymphocytes populations in murine models of Systemic Lupus Erythematosus exhibit different responses to treatment with metabolic modulators. The Journal of Immunology 2019. [DOI: 10.4049/jimmunol.202.supp.115.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
An often debilitating autoimmune disease involving multiple immune cell types and tissues, Systemic Lupus Erythematosus (SLE) afflicts nearly 3 in a 1000 people, an estimated 9.7 million in the United States. Murine models of lupus are essential for the study of disease progression, prevention, and treatment of SLE, with B6.Sle1.Sle2.Sle3 triple congenic (TC) and NZB X NZW F1 hybrid (NZB/W) being two murine models commonly used for these purposes. While these murine models show similar disease symptomology, they exhibit immune cell subsets that differ metabolically. CD4+ T cells from TC mice show increased glycolysis and phosphorylation (OXPHOS) function, however CD4+ T cells from NZB/W mice demonstrate similar activity of OXPHOS and glycolysis compared to control B6 mice. B cells from both strains present similar elevated metabolism. Further, CD4+ T cell and B cell populations from these two strains display differential metabolic modulation during treatment with the same metabolic inhibitors. This contrasts with a similar therapeutic efficiency of a treatment inhibiting glycolysis with 2DG and mitochondrial respiration with metformin in both murine models of lupus. This implies metabolic inhibitors may have therapeutic efficiency across cell-specific differences in metabolic defects.
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Affiliation(s)
- Caleb Cornaby
- 1Department of Pathology, Immunology, and Laboratory Medicine- University of Florida
| | | | - Seung-Chul Choi
- 1Department of Pathology, Immunology, and Laboratory Medicine- University of Florida
| | - Wei Li
- 2Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL, United States
| | - Laurence Morel
- 1Department of Pathology, Immunology, and Laboratory Medicine- University of Florida
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14
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Abboud G, Choi SC, Kanda N, Zeumer-Spataro L, Roopenian DC, Morel L. Inhibition of Glycolysis Reduces Disease Severity in an Autoimmune Model of Rheumatoid Arthritis. Front Immunol 2018; 9:1973. [PMID: 30233578 PMCID: PMC6130222 DOI: 10.3389/fimmu.2018.01973] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 08/10/2018] [Indexed: 12/30/2022] Open
Abstract
The K/BxN mouse is a spontaneous model of arthritis driven by T cell receptor transgenic CD4+ T cells from the KRN strain that are activated by glucose-6-phosphate isomerase (GPI) peptides presented by the H-2g7 allele from the NOD strain. It is a model of autoimmune seropositive arthritis because the production of anti-GPI IgG is necessary and sufficient for joint pathology. The production of high levels of anti-GPI IgG requires on the expansion of CD4+ follicular helper T (Tfh) cells. The metabolic requirements of this expansion have never been characterized. Based on the therapeutic effects of the combination of metformin and 2-deoxyglucose (2DG) in lupus models that normalized the expansion of effector CD4+ T cells. We showed that the CD4+ T cells and to a lesser extent, the B cells from K/BxN mice are more metabolically active than the KRN controls. Accordingly, preventive inhibition of glycolysis with 2DG significantly reduced joint inflammation and the activation of both adaptive and innate immune cells, as well as the production of pathogenic autoantibodies. However, contrary to the lupus-prone mice, the addition of metformin had little beneficial effect, suggesting that glycolysis is the major driver of immune activation in this model. We propose that K/BxN mice are another model in which autoreactive Tfh cells are highly glycolytic and that their function can be limited by inhibiting glucose metabolism.
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Affiliation(s)
- Georges Abboud
- Immunology, and Laboratory Medicine, Department of Pathology, University of Florida, Gainesville, FL, United States
| | - Seung-Chul Choi
- Immunology, and Laboratory Medicine, Department of Pathology, University of Florida, Gainesville, FL, United States
| | - Nathalie Kanda
- Immunology, and Laboratory Medicine, Department of Pathology, University of Florida, Gainesville, FL, United States
| | - Leilani Zeumer-Spataro
- Immunology, and Laboratory Medicine, Department of Pathology, University of Florida, Gainesville, FL, United States
| | | | - Laurence Morel
- Immunology, and Laboratory Medicine, Department of Pathology, University of Florida, Gainesville, FL, United States
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