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Arabpour M, Lebrero-Fernandez C, Schön K, Strömberg A, Börjesson V, Lahl K, Ballegeer M, Saelens X, Angeletti D, Agace W, Lycke N. ADP-ribosylating adjuvant reveals plasticity in cDC1 cells that drive mucosal Th17 cell development and protection against influenza virus infection. Mucosal Immunol 2022; 15:745-761. [PMID: 35418673 PMCID: PMC9259495 DOI: 10.1038/s41385-022-00510-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 03/07/2022] [Accepted: 03/23/2022] [Indexed: 02/04/2023]
Abstract
Migratory dendritic cells expressing CD103 are the targets for mucosal vaccines. These belong to either of two lineage-restricted subsets, cDC1 or cDC2 cells, which have been linked to priming of functionally distinct CD4 T cells. However, recent studies have identified plasticity in cDC2 cells with overlapping functions with cDC1 cells, while the converse has not been reported. We genetically engineered a vaccine adjuvant platform that targeted the cholera toxin A1 (CTA1) ADP-ribosylating enzyme to CD103+ cDC1 and cDC2 cells using a single-chain antibody (scFv) to CD103. Unexpectedly, intranasal immunization with the CTA1-svFcCD103 adjuvant modified cDC1 cells to effectively prime Th17 cells, a function previously limited to cDC2 cells. In fact, cDC2 cells were dispensible, while cDC1 cells, lacking in Batf3-/- mice, were critical. Following intranasal immunizations isolated cDC1 cells from mLN exclusively promoted Rorgt+ T cells and IL-17, IL-21, and IL-22 production. Strong CD8 T cell responses through antigen cross presentation by cDC1 cells were also observed. Single-cell RNAseq analysis revealed upregulation of Th17-promoting gene signatures in sorted cDC1 cells. Gene expression in isolated cDC2 cells was largely unaffected. Our finding represents a major shift of paradigm as we have documented functional plasticity in cDC1 cells.
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Affiliation(s)
- Mohammad Arabpour
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Cristina Lebrero-Fernandez
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Karin Schön
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Anneli Strömberg
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Vanja Börjesson
- grid.8761.80000 0000 9919 9582Bioinformatics Core Facility, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Katharina Lahl
- grid.4514.40000 0001 0930 2361Immunology Section, Lund University, BMC D14, 221-84 Lund, Sweden
| | - Marlies Ballegeer
- grid.5342.00000 0001 2069 7798VIB-UGent Center for Medical Biotechnology, VIB, Ghent, Belgium and Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Xavier Saelens
- grid.5342.00000 0001 2069 7798VIB-UGent Center for Medical Biotechnology, VIB, Ghent, Belgium and Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Davide Angeletti
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - William Agace
- grid.4514.40000 0001 0930 2361Immunology Section, Lund University, BMC D14, 221-84 Lund, Sweden ,grid.5170.30000 0001 2181 8870Mucosal Immunology Group, Department of Health Technology, Technical University of Denmark, Kemitorvet, 2800 Kgs, Lyngby, Denmark
| | - Nils Lycke
- grid.8761.80000 0000 9919 9582MIVAC-Mucosal Immunobiology & Vaccine Center, Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
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2
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Miller WB, Baluška F, Torday JS. Cellular senomic measurements in Cognition-Based Evolution. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 156:20-33. [PMID: 32738355 DOI: 10.1016/j.pbiomolbio.2020.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/20/2020] [Accepted: 07/04/2020] [Indexed: 12/27/2022]
Abstract
All living entities are cognitive and dependent on ambiguous information. Any assessment of that imprecision is necessarily a measuring function. Individual cells measure information to sustain self-referential homeostatic equipoise (self-identity) in juxtaposition to the external environment. The validity of that information is improved by its collective assessment. The reception of cellular information obliges thermodynamic reactions that initiate a self-reinforcing work channel. This expresses as natural cellular engineering and niche constructions which become the complex interrelated tissue ecologies of holobionts. Multicellularity is collaborative cellular information management directed towards the optimization of information quality through its collective measured assessment. Biology and its evolution can now be re-framed as the continuous process of self-referential cellular measurement in the perpetual defense of individual cellular self-identities through the collective form.
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Affiliation(s)
| | | | - John S Torday
- Department of Pediatrics, Harbor-UCLA Medical Center, USA.
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3
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Miller WB, Torday JS, Baluška F. The N-space Episenome unifies cellular information space-time within cognition-based evolution. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2019; 150:112-139. [PMID: 31415772 DOI: 10.1016/j.pbiomolbio.2019.08.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/26/2019] [Accepted: 08/09/2019] [Indexed: 02/08/2023]
Abstract
Self-referential cellular homeostasis is maintained by the measured assessment of both internal status and external conditions based within an integrated cellular information field. This cellular field attachment to biologic information space-time coordinates environmental inputs by connecting the cellular senome, as the sum of the sensory experiences of the cell, with its genome and epigenome. In multicellular organisms, individual cellular information fields aggregate into a collective information architectural matrix, termed a N-space Episenome, that enables mutualized organism-wide information management. It is hypothesized that biological organization represents a dual heritable system constituted by both its biological materiality and a conjoining N-space Episenome. It is further proposed that morphogenesis derives from reciprocations between these inter-related facets to yield coordinated multicellular growth and development. The N-space Episenome is conceived as a whole cell informational projection that is heritable, transferable via cell division and essential for the synchronous integration of the diverse self-referential cells that constitute holobionts.
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Affiliation(s)
| | - John S Torday
- Department of Pediatrics, Harbor-UCLA Medical Center, USA.
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4
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Yaciuk JC, Pan Y, Schwarz K, Pan ZJ, Maier-Moore JS, Kosanke SD, Lawrence C, Farris AD. Defective selection of thymic regulatory T cells accompanies autoimmunity and pulmonary infiltrates in Tcra-deficient mice double transgenic for human La/Sjögren's syndrome-B and human La-specific TCR. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2015; 194:1514-22. [PMID: 25582858 PMCID: PMC4323622 DOI: 10.4049/jimmunol.1400319] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A human La/Sjögren's syndrome-B (hLa)-specific TCR/hLa neo-self-Ag double-transgenic (Tg) mouse model was developed and used to investigate cellular tolerance and autoimmunity to the ubiquitous RNA-binding La Ag often targeted in systemic lupus erythematosus and Sjögren's syndrome. Extensive thymic clonal deletion of CD4(+) T cells occurred in H-2(k/k) double-Tg mice presenting high levels of the I-E(k)-restricted hLa T cell epitope. In contrast, deletion was less extensive in H-2(k/b) double-Tg mice presenting lower levels of the epitope, and some surviving thymocytes were positively selected as thymic regulatory T cells (tTreg). These mice remained serologically tolerant to hLa and healthy. H-2(k/b) double-Tg mice deficient of all endogenous Tcra genes, a deficiency known to impair Treg development and function, produced IgG anti-hLa autoantibodies and displayed defective tTreg development. These autoimmune mice had interstitial lung disease characterized by lymphocytic aggregates containing Tg T cells with an activated, effector memory phenotype. Salivary gland infiltrates were notably absent. Thus, expression of nuclear hLa Ag induces thymic clonal deletion and tTreg selection, and lymphocytic infiltration of the lung is a consequence of La-specific CD4(+) T cell autoimmunity.
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Affiliation(s)
- Jane C Yaciuk
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104; Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; and
| | - Yujun Pan
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | - Karen Schwarz
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | - Zi-Jian Pan
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | - Jacen S Maier-Moore
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | - Stanley D Kosanke
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104
| | - Christina Lawrence
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104
| | - A Darise Farris
- Arthritis and Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104; Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; and Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; and
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Ebert PJR, Li QJ, Huppa JB, Davis MM. Functional development of the T cell receptor for antigen. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2010; 92:65-100. [PMID: 20800817 PMCID: PMC4887107 DOI: 10.1016/s1877-1173(10)92004-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
For over three decades now, the T cell receptor (TCR) for antigen has not ceased to challenge the imaginations of cellular and molecular immunologists alike. T cell antigen recognition transcends every aspect of adaptive immunity: it shapes the T cell repertoire in the thymus and directs T cell-mediated effector functions in the periphery, where it is also central to the induction of peripheral tolerance. Yet, despite its central position, there remain many questions unresolved: how can one TCR be specific for one particular peptide-major histocompatibility complex (pMHC) ligand while also binding other pMHC ligands with an immunologically relevant affinity? And how can a T cell's extreme specificity (alterations of single methyl groups in their ligand can abrogate a response) and sensitivity (single agonist ligands on a cell surface are sufficient to trigger a measurable response) emerge from TCR-ligand interactions that are so low in affinity? Solving these questions is intimately tied to a fundamental understanding of molecular recognition dynamics within the many different contexts of various T cell-antigen presenting cell (APC) contacts: from the thymic APCs that shape the TCR repertoire and guide functional differentiation of developing T cells to the peripheral APCs that support homeostasis and provoke antigen responses in naïve, effector, memory, and regulatory T cells. Here, we discuss our recent findings relating to T cell antigen recognition and how this leads to the thymic development of foreign-antigen-responsive alphabetaT cells.
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Affiliation(s)
- Peter J R Ebert
- The Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, USA
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Lamprecht P. Off balance: T-cells in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides. Clin Exp Immunol 2005; 141:201-10. [PMID: 15996183 PMCID: PMC1809434 DOI: 10.1111/j.1365-2249.2005.02808.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2005] [Indexed: 10/25/2022] Open
Abstract
There is substantial evidence that T-cells are off balance in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides. Genetic risk factors may influence shaping of the TCR repertoire and regulatory control of T-cells in predisposed individuals. T-cells are found in inflammatory lesions. Vigorous Th1-type responses are seen in Wegener's granulomatosis and microscopic angiitis, whereas a Th2-type response predominates in Churg-Strauss syndrome. Oligoclonality and shortened telomers indicate antigen-driven clonal expansion and replicative senescence of T-cells in ANCA-associated vasculitides. Potent CD28(-) Th1-type cells displaying an effector-memory/late differentiated, senescent phenotype are expanded in peripheral blood and are found in granulomatous lesions in Wegener's granulomatosis. Differences in proliferative peripheral blood T-cell responses to the autoantigens proteinase 3 (PR3)- and myeloperoxidase (MPO) have not consistently been detected between patients with ANCA-associated vasculitides and healthy controls in vitro. To recognize an autoantigen, break tolerance, and maintain autoimmune disease T- and B-cells require particular triggers and lymphoid structures. There is preliminary evidence of lymphoid-like structures and possible maturation of autoreactive PR3-ANCA-specific B-cells in granulomatous lesions in Wegener's granulomatosis. Alteration of the T-cell response and anomalous autoantigen-presentation in lymphoid-structures could facilitate development of autoimmune disease in ANCA-associated vasculitides.
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Affiliation(s)
- P Lamprecht
- Department of Rheumatology, University Hospital of Schleswig-Holstein, 23538 Luebeck, Germany.
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7
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Bennett JL, Elhofy A, Dal Canto MC, Tani M, Ransohoff RM, Karpus WJ. CCL2 transgene expression in the central nervous system directs diffuse infiltration of CD45(high)CD11b(+) monocytes and enhanced Theiler's murine encephalomyelitis virus-induced demyelinating disease. J Neurovirol 2004; 9:623-36. [PMID: 14602575 PMCID: PMC7095321 DOI: 10.1080/13550280390247551] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
CCL2 is a member of the CC chemokine family that mediates the migration and recruitment of monocytes and T cells and has been identified in the central nervous system (CNS) during several neuroinflammatory diseases. In order to examine the biological effect of constitutive CCL2 expression in the CNS, the authors engineered a mouse that expressed CCL2 in the CNS under control of the human glial fibrillary acidic protein (hGFAP) promoter. The results demonstrated that transgenic expression of CCL2 in the CNS resulted in diffuse CNS monocyte infiltration and accumulation. Transgenic CCL2 expression did not alter normal development, differentiation, or function of T cells. There was no evidence of overt CNS disease or other pathologic phenotype when mice were left unchallenged with antigen or uninfected. However, when CCL2 transgenic mice were given a peripheral challenge of lipopolysaccharide (LPS), an inflammatory infiltrate with organized perivascular lesions developed. Infection of the transgenic mice with Theiler's murine encephalomyelitis virus (TMEV) resulted in accelerated onset and increased severity of clinical and histological disease. These results suggest that CCL2 expression in the CNS is a major pathogenic factor that drives macrophage accumulation in the development of CNS inflammatory disease.
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Affiliation(s)
- Jami L. Bennett
- Department of Pathology, Northwestern University, Feinberg School of Medicine, 303 E. Chicago Avenue, W127, 60611 Chicago, IL USA
| | - Adam Elhofy
- Department of Pathology, Northwestern University, Feinberg School of Medicine, 303 E. Chicago Avenue, W127, 60611 Chicago, IL USA
| | - Mauro C. Dal Canto
- Department of Pathology, Northwestern University, Feinberg School of Medicine, 303 E. Chicago Avenue, W127, 60611 Chicago, IL USA
| | - Mari Tani
- Department of Neuroscience, Cleveland Clinic Foundation, Cleveland, Ohio USA
| | | | - William J. Karpus
- Department of Pathology, Northwestern University, Feinberg School of Medicine, 303 E. Chicago Avenue, W127, 60611 Chicago, IL USA
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8
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Nakken B, Davis KE, Pan ZJ, Bachmann M, Farris AD. T-helper cell tolerance to ubiquitous nuclear antigens. Scand J Immunol 2003; 58:478-92. [PMID: 14629620 PMCID: PMC2579760 DOI: 10.1046/j.1365-3083.2003.01323.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Systemic autoimmune diseases are characterized by the development of antinuclear autoantibodies. In order to understand the immunologic events leading to the development of such antibodies, knowledge of mechanisms of immune tolerance to nuclear antigens is required. By utilizing adoptive T-cell transfer strategies with transgenic mouse models expressing nuclear neo-self antigens, T-cell tolerance to the lupus-related nuclear antigens human La and nRNP A has been demonstrated. These findings also indicate the existence in normal animals of autoreactive B cells continuously presenting nuclear antigen, suggesting that nuclear antigens are not sequestered from the immune system. Investigations of CD4+ T-cell tolerance to non-nuclear antigens have revealed a number of mechanisms that protect the host from autoreactivity, including autoreactive T-cell deletion, regulatory T-cell development and anergy induction. Recent studies using T-cell receptor and neo-self nuclear antigen transgenic mice are revealing the importance of such mechanisms in maintaining tolerance to nuclear antigens. Mechanisms of tolerogenic antigen presentation, identification of tolerogenic antigen source(s) and the pathways leading to loss of tolerance to nuclear antigens in systemic autoimmune disease states are currently being sought.
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Affiliation(s)
- B Nakken
- Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
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9
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Abstract
A functional immune system requires the selection of T lymphocytes expressing receptors that are major histocompatibility complex restricted but tolerant to self-antigens. This selection occurs predominantly in the thymus, where lymphocyte precursors first assemble a surface receptor. In this review we summarize the current state of the field regarding the natural ligands and molecular factors required for positive and negative selection and discuss a model for how these disparate outcomes can be signaled via the same receptor. We also discuss emerging data on the selection of regulatory T cells. Such cells require a high-affinity interaction with self-antigens, yet differentiate into regulatory cells instead of being eliminated.
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Affiliation(s)
- Timothy K Starr
- Center for Immunology and the Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455, USA.
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10
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Viret C, He X, Janeway CA. Altered positive selection due to corecognition of floppy peptide/MHC II conformers supports an integrative model of thymic selection. Proc Natl Acad Sci U S A 2003; 100:5354-9. [PMID: 12700352 PMCID: PMC154349 DOI: 10.1073/pnas.0831129100] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Thymocytes bearing the E alpha 52-68/I-A(b) complex-specific 1H3.1 alpha beta T cell antigen receptor are positively selected in Ab-Ep [Ab-Ep transgenic, invariant chain (Ii)(-/-), I-A beta(b-/-)] mice, where I-A(b) molecules present only E alpha 52-68. Although Ii reintroduction led to deletion, I-A beta(b) reintroduction disrupted positive selection. T cell antigen receptor transgenic Ab-Ep I-A beta(b+) mice had a large thymus with an increased absolute number of CD4(+)CD8(+) cells and no overt signs of deletion. Unlike Ab-Ep Ii(+) antigen-presenting cells, Ab-Ep I-A beta(b+) antigen-presenting cells did not activate 1H3.1 T cells. However, their capacity to present E alpha 52-68 was intact. Thus, positive selection of 1H3.1 thymocytes on the tight compact E alpha 52-68/I-A(b) complex is neutralized by the corecognition of loose compact self-peptide/I-A(b) conformers that do not interfere with the cognate activation of mature 1H3.1 T cells. The data support the notion that the integration of distinct signals generated by the simultaneous recognition of multiple self-peptide/MHC complexes directs intrathymic selection of T cells.
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Affiliation(s)
- Christophe Viret
- Howard Hughes Medical Institute and Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA
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11
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Lovitch SB, Walters JJ, Gross ML, Unanue ER. APCs present A beta(k)-derived peptides that are autoantigenic to type B T cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:4155-60. [PMID: 12682247 DOI: 10.4049/jimmunol.170.8.4155] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Type B T cells recognize peptide provided exogenously but are ignorant of the same epitope derived from intracellular processing. In this study, we demonstrate the existence of type B T cells to an abundant autologous peptide derived from processing of the I-A(k) beta-chain. T cell hybridomas raised against this peptide fail to recognize syngeneic APC despite abundant presentation of the naturally processed epitope but react in a dose-dependent manner to exogenous peptide. Moreover, these hybridomas respond to Abeta(k) peptide extracted from the surface of I-A(k)-expressing APC. This peptide was isolated from B cell lines where it was found in high abundance; it was also present in lines lacking HLA-DM, but in considerably lower amounts. Therefore, type B T cells exist in the naive repertoire to abundant autologous peptides. We discuss the implications of these findings to the potential biological role of type B T cells in immune responses and autoimmune pathology.
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Affiliation(s)
- Scott B Lovitch
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
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12
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Haribhai D, Engle D, Meyer M, Donermeyer D, White JM, Williams CB. A threshold for central T cell tolerance to an inducible serum protein. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:3007-14. [PMID: 12626554 DOI: 10.4049/jimmunol.170.6.3007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We report an inducible system of self Ag expression that examines the relationship between serum protein levels and central T cell tolerance. This transgenic approach is based on tetracycline-regulated expression of a secreted form of hen egg lysozyme, tagged with a murine hemoglobin (Hb) epitope. In the absence of the tetracycline-regulated transactivator, serum levels of the chimeric protein are extremely low (< or = 0.1 ng/ml) and the mice show partial tolerance to both Hb(64-76) and lysozyme epitopes. In the presence of the transactivator, expression increases to 1.5 ng/ml and the mice are completely tolerant. Partial tolerance was further investigated by crossing these mice to strains expressing transgenic TCRs. At the lowest Ag levels, 3.L2tg T cells (specific for Hb(64-76)/I-E(k)) escape the thymus and approximately 10% of CD4(+) splenocytes express the 3.L2 TCR. In contrast, 3A9 T cells (specific for hen egg lysozyme(46-61)/I-A(k)) are completely eliminated by negative selection. These data define a tolerogenic threshold for negative selection of Ag-specific T cells by circulating self proteins that are 100-fold more sensitive than previously demonstrated. They suggest that partial tolerance at extremely low levels of self Ag exposure is the result of a restricted repertoire of responding T cells, rather than a simple reduction in precursor frequency; tolerogenic thresholds are T cell specific.
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Affiliation(s)
- Dipica Haribhai
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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13
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Zhu Y, Rudensky AY, Corper AL, Teyton L, Wilson IA. Crystal structure of MHC class II I-Ab in complex with a human CLIP peptide: prediction of an I-Ab peptide-binding motif. J Mol Biol 2003; 326:1157-74. [PMID: 12589760 DOI: 10.1016/s0022-2836(02)01437-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Association between the class II major histocompatibility complex (MHC) and the class II invariant chain-associated peptide (CLIP) occurs naturally as an intermediate step in the MHC class II processing pathway. Here, we report the crystal structure of the murine class II MHC molecule I-A(b) in complex with human CLIP at 2.15A resolution. The structure of I-A(b) accounts, via the peptide-binding groove's unique physicochemistry, for the distinct peptide repertoire bound by this allele. CLIP adopts a similar conformation to peptides bound by other I-A alleles, reinforcing the notion that CLIP is presented as a conventional peptide antigen. When compared to the related HLA-DR3/CLIP complex structure, the CLIP peptide displays a slightly different conformation and distinct interaction pattern with residues in I-A(b). In addition, after examining the published sequences of peptides presented by I-A(b), we discuss the possibility of predicting peptide alignment in the I-A(b) binding groove using a simple scoring matrix.
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Affiliation(s)
- Yuerong Zhu
- Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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14
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Viret C, Janeway CA. Self-specific MHC class II-restricted CD4-CD8- T cells that escape deletion and lack regulatory activity. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:201-9. [PMID: 12496401 DOI: 10.4049/jimmunol.170.1.201] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the presence of the I-Ealpha protein, transgenic (Tg) mice expressing the 1H3.1 alphabeta TCR that is specific for the Ealpha52-68:I-A(b) complex display drastic intrathymic deletion. Although peripheral T cells from these mice remained unresponsive to the Ealpha52-68:I-A(b) complex, they contained a subpopulation able to specifically react to this complex in the presence of exogenous IL-2, indicating that some 1H3.1 alphabeta TCR Tg T cells have escaped clonal deletion and efficiently populated the periphery. IL-2-dependent, Ealpha52-68:I-A(b) complex-responsive T cells were CD4-CD8- and expressed the 1H3.1 alphabeta TCR. Such T cells could develop intrathymically, did not show sign of regulatory/suppressor activity, displayed a typical naive phenotype, and seemed to persist in vivo over time. CD4-CD8- TCR Tg T cells were also detected when the surface density of the deleting ligand was increased on MHC class II+ cells. In addition, the development of CD4-CD8- 1H3.1 alphabeta TCR Tg T cells could be supported by I-A(b) molecules. These observations indicate that CD4 surface expression neither specifies, nor is required for, the thymic export of mature thymocytes expressing a MHC class II-restricted alphabeta TCR. The data also show that, although the avidity of the interaction involved in intrathymic deletion is significantly lower than that involved in mature T cell activation, its range can be large enough to be influenced by the presence or absence of coreceptors. Finally, the margin created by the absence of CD4 coreceptor was substantial because it could accommodate various amounts of the deleting ligand on thymic stromal cells.
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Affiliation(s)
- Christophe Viret
- Section of Immunobiology, Yale University School of Medicine and Howard Hughes Medical Institute, New Haven, CT 06520-8011, USA
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15
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Santori FR, Brown SM, Vukmanović S. Genomics-based identification of self-ligands with T cell receptor-specific biological activity. Immunol Rev 2002; 190:146-60. [PMID: 12493012 DOI: 10.1034/j.1600-065x.2002.19011.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Self-peptide/major histocompatibility complex (MHC) complexes profoundly influence the biology of T lymphocytes. They promote the selection of the T cell receptor (TCR) repertoire in the thymus, maintain the homeostasis of peripheral T cells prior to encounter with antigen, and modify the responsiveness of T cells to foreign antigens. In addition, they can serve as antigens for autoaggressive T cells that induce autoimmune diseases. The complete sequencing of the genomes of human, mouse, and many pathogenic organisms now provides us with a comprehensive list of all possible proteins that may be the source of foreign antigenic and self-peptides. A computational approach using profile-based similarity searches on potential self-MHC-binding peptides can be used to efficiently predict self-peptides with biological activities. The common feature of the identified peptides is similarity to antigen. Thus, self-peptides may form 'hazy' images of the universe of antigens that are used as templates to create and maintain the TCR repertoire.
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Affiliation(s)
- Fabio R Santori
- Michael Heidelberger Division of Immunology, Department of Pathology and NYU Cancer Center, New York, NY 10016, USA
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Santori FR, Kieper WC, Brown SM, Lu Y, Neubert TA, Johnson KL, Naylor S, Vukmanović S, Hogquist KA, Jameson SC. Rare, structurally homologous self-peptides promote thymocyte positive selection. Immunity 2002; 17:131-42. [PMID: 12196285 DOI: 10.1016/s1074-7613(02)00361-8] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Although it is clear that positive selection of T cells involves recognition of specific self-peptide/MHC complexes, the nature of these self-ligands and their relationship to the cognate antigen are controversial. Here we used two complementary strategies to identify naturally occurring self-peptides able to induce positive selection of T cells bearing a specific T cell receptor, OT-I. Both the bioassay- and bioinformatics-based strategies identified the same self-peptides, derived from F-actin capping protein and beta-catenin. These peptides displayed charge conservation at two key TCR contact residues. The biological activity of 43 other self-peptides and of complex peptide libraries directly correlated to the extent of conservation at TCR contact residues. These results demonstrate that selecting self-peptides are rare and can be identified by homology-based search strategies.
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Affiliation(s)
- Fabio R Santori
- Michael Heidelberger Division of Immunology, Department of Pathology and Kaplan Cancer Center, New York University School of Medicine, 550 First Avenue, NY 10016, USA
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Viret C, He X, Janeway CA. Paradoxical intrathymic positive selection in mice with only a covalently presented agonist peptide. Proc Natl Acad Sci U S A 2001; 98:9243-8. [PMID: 11470911 PMCID: PMC55405 DOI: 10.1073/pnas.161274698] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The Y-Ae mAb and the 1H3.1 alphabeta T cell antigen receptor (TCR) are both specific for the I-Ealpha52-68 peptide bound to the I-A(b) major histocompatibility complex (MHC) class II molecule. Antigen-presenting cells (APCs) from I-A(b+) mice with a natural or transgenic (Tg) I-Ealpha chain activate mature 1H3.1 T cells and cause the deletion of 1H3.1 TCR Tg thymocytes. However, 1H3.1 T cells were neither activated nor inactivated by confrontation with APCs from I-Ab-Ep mice in which I-A(b) molecules are occupied only by the covalently associated Ealpha52-68 peptide. Instead, immature 1H3.1 TCR Tg thymocytes were efficiently positively selected into the CD4 lineage in the I-Ab-Ep thymus. This selection relied on specific recognition of the Ealpha52-68/I-A(b) complex because it was blocked by Y-Ae. 1H3.1 TCR Tg T cells maturing in the I-Ab-Ep thymus efficiently populated the periphery, displayed a naive phenotype, and were specifically reactive to the Ealpha52-68 peptide or to I-A(b+)I-Ealpha(+) APCs, indicating that 1H3.1 T cells were not antagonized in I-Ab-Ep mice. The data identify major histocompatibility complex class II molecules with only a covalently attached self-peptide as a ligand for in vivo positive selection of T cells specific for the same peptide.
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Affiliation(s)
- C Viret
- Section of Immunobiology, Yale University School of Medicine, and Howard Hughes Medical Institute, New Haven, CT 06520-8011, USA
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Janeway CA. How the immune system works to protect the host from infection: a personal view. Proc Natl Acad Sci U S A 2001; 98:7461-8. [PMID: 11390983 PMCID: PMC34691 DOI: 10.1073/pnas.131202998] [Citation(s) in RCA: 196] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2001] [Indexed: 01/07/2023] Open
Affiliation(s)
- C A Janeway
- Section of Immunobiology and The Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06520-8011, USA.
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