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Park JS, Perl A. Endosome Traffic Modulates Pro-Inflammatory Signal Transduction in CD4 + T Cells-Implications for the Pathogenesis of Systemic Lupus Erythematosus. Int J Mol Sci 2023; 24:10749. [PMID: 37445926 DOI: 10.3390/ijms241310749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/10/2023] [Accepted: 06/26/2023] [Indexed: 07/15/2023] Open
Abstract
Endocytic recycling regulates the cell surface receptor composition of the plasma membrane. The surface expression levels of the T cell receptor (TCR), in concert with signal transducing co-receptors, regulate T cell responses, such as proliferation, differentiation, and cytokine production. Altered TCR expression contributes to pro-inflammatory skewing, which is a hallmark of autoimmune diseases, such as systemic lupus erythematosus (SLE), defined by a reduced function of regulatory T cells (Tregs) and the expansion of CD4+ helper T (Th) cells. The ensuing secretion of inflammatory cytokines, such as interferon-γ and interleukin (IL)-4, IL-17, IL-21, and IL-23, trigger autoantibody production and tissue infiltration by cells of the adaptive and innate immune system that induce organ damage. Endocytic recycling influences immunological synapse formation by CD4+ T lymphocytes, signal transduction from crosslinked surface receptors through recruitment of adaptor molecules, intracellular traffic of organelles, and the generation of metabolites to support growth, cytokine production, and epigenetic control of DNA replication and gene expression in the cell nucleus. This review will delineate checkpoints of endosome traffic that can be targeted for therapeutic interventions in autoimmune and other disease conditions.
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Affiliation(s)
- Joy S Park
- Department of Medicine, Norton College of Medicine, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
- Department of Biochemistry and Molecular Biology, Norton College of Medicine, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
| | - Andras Perl
- Department of Medicine, Norton College of Medicine, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
- Department of Biochemistry and Molecular Biology, Norton College of Medicine, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
- Department of Microbiology and Immunology, Norton College of Medicine, State University of New York, Upstate Medical University, Syracuse, NY 13210, USA
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2
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Huisman BD, Balivada PA, Birnbaum ME. Yeast display platform with expression of linear peptide epitopes for high-throughput assessment of peptide-MHC-II binding. J Biol Chem 2023; 299:102913. [PMID: 36649909 PMCID: PMC9971316 DOI: 10.1016/j.jbc.2023.102913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
Yeast display can serve as a powerful tool to assess the binding of peptides to the major histocompatibility complex (pMHC) and pMHC-T-cell receptor binding. However, this approach is often limited by the need to optimize MHC proteins for yeast surface expression, which can be laborious and may not yield productive results. Here we present a second-generation yeast display platform for class II MHC molecules (MHC-II), which decouples MHC-II expression from yeast-expressed peptides, referred to as "peptide display." Peptide display obviates the need for yeast-specific MHC optimizations and increases the scale of MHC-II alleles available for use in yeast display screens. Because MHC identity is separated from the peptide library, a further benefit of this platform is the ability to assess a single library of peptides against any MHC-II. We demonstrate the utility of the peptide display platform across MHC-II proteins, screening HLA-DR, HLA-DP, and HLA-DQ alleles. We further explore parameters of selections, including reagent dependencies, MHC avidity, and use of competitor peptides. In summary, this approach presents an advance in the throughput and accessibility of screening peptide-MHC-II binding.
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Affiliation(s)
- Brooke D Huisman
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, USA; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, USA
| | - Pallavi A Balivada
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, USA; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, USA
| | - Michael E Birnbaum
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, USA; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, USA; Ragon Institute of MGH, MIT and Harvard, Cambridge, USA.
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3
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Jin Y, Deng Z, Zhu T. Membrane protein trafficking in the anti-tumor immune response: work of endosomal-lysosomal system. Cancer Cell Int 2022; 22:413. [PMID: 36528587 PMCID: PMC9759898 DOI: 10.1186/s12935-022-02805-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 11/24/2022] [Indexed: 12/23/2022] Open
Abstract
Immunotherapy has changed the treatment landscape for multiple cancer types. In the recent decade, great progress has been made in immunotherapy, including immune checkpoint inhibitors, adoptive T-cell therapy, and cancer vaccines. ICIs work by reversing tumor-induced immunosuppression, resulting in robust activation of the immune system and lasting immune responses. Whereas, their clinical use faces several challenges, especially the low response rate in most patients. As an increasing number of studies have focused on membrane immune checkpoint protein trafficking and degradation, which interferes with response to immunotherapy, it is necessary to summarize the mechanism regulating those transmembrane domain proteins translocated into the cytoplasm and degraded via lysosome. In addition, other immune-related transmembrane domain proteins such as T-cell receptor and major histocompatibility are associated with neoantigen presentation. The endosomal-lysosomal system can also regulate TCR and neoantigen-MHC complexes on the membrane to affect the efficacy of adoptive T-cell therapy and cancer vaccines. In conclusion, we discuss the process of surface delivery, internalization, recycling, and degradation of immune checkpoint proteins, TCR, and neoantigen-MHC complexes on the endosomal-lysosomal system in biology for optimizing cancer immunotherapy.
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Affiliation(s)
- Yan Jin
- grid.412632.00000 0004 1758 2270Cancer Center, Renmin Hospital of Wuhan University, Wuhan, 430060 China
| | - Zhifeng Deng
- grid.412632.00000 0004 1758 2270Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060 China
| | - Ting Zhu
- grid.412632.00000 0004 1758 2270Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060 China
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4
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Li Y, Jiang W, Mellins ED. TCR-like antibodies targeting autoantigen-mhc complexes: a mini-review. Front Immunol 2022; 13:968432. [PMID: 35967436 PMCID: PMC9363607 DOI: 10.3389/fimmu.2022.968432] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 07/06/2022] [Indexed: 11/13/2022] Open
Abstract
T cell receptors (TCRs) recognize peptide antigens bound to major histocompatibility complex (MHC) molecules (p/MHC) that are expressed on cell surfaces; while B cell-derived antibodies (Abs) recognize soluble or cell surface native antigens of various types (proteins, carbohydrates, etc.). Immune surveillance by T and B cells thus inspects almost all formats of antigens to mount adaptive immune responses against cancer cells, infectious organisms and other foreign insults, while maintaining tolerance to self-tissues. With contributions from environmental triggers, the development of autoimmune disease is thought to be due to the expression of MHC risk alleles by antigen-presenting cells (APCs) presenting self-antigen (autoantigen), breaking through self-tolerance and activating autoreactive T cells, which orchestrate downstream pathologic events. Investigating and treating autoimmune diseases have been challenging, both because of the intrinsic complexity of these diseases and the need for tools targeting T cell epitopes (autoantigen-MHC). Naturally occurring TCRs with relatively low (micromolar) affinities to p/MHC are suboptimal for autoantigen-MHC targeting, whereas the use of engineered TCRs and their derivatives (e.g., TCR multimers and TCR-engineered T cells) are limited by unpredictable cross-reactivity. As Abs generally have nanomolar affinity, recent advances in engineering TCR-like (TCRL) Abs promise advantages over their TCR counterparts for autoantigen-MHC targeting. Here, we compare the p/MHC binding by TCRs and TCRL Abs, review the strategies for generation of TCRL Abs, highlight their application for identification of autoantigen-presenting APCs, and discuss future directions and limitations of TCRL Abs as immunotherapy for autoimmune diseases.
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Affiliation(s)
- Ying Li
- Department of Pediatrics, Divisions of Human Gene Therapy and Allergy, Immunology & Rheumatology, Stanford University School of Medicine, Stanford, CA, United States
- Stanford Program in Immunology, Stanford University School of Medicine, Stanford, CA, United States
| | - Wei Jiang
- Department of Pediatrics, Divisions of Human Gene Therapy and Allergy, Immunology & Rheumatology, Stanford University School of Medicine, Stanford, CA, United States
- Stanford Program in Immunology, Stanford University School of Medicine, Stanford, CA, United States
- *Correspondence: Wei Jiang, ; Elizabeth D. Mellins,
| | - Elizabeth D. Mellins
- Department of Pediatrics, Divisions of Human Gene Therapy and Allergy, Immunology & Rheumatology, Stanford University School of Medicine, Stanford, CA, United States
- Stanford Program in Immunology, Stanford University School of Medicine, Stanford, CA, United States
- *Correspondence: Wei Jiang, ; Elizabeth D. Mellins,
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5
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Pishesha N, Harmand TJ, Ploegh HL. A guide to antigen processing and presentation. Nat Rev Immunol 2022; 22:751-764. [PMID: 35418563 DOI: 10.1038/s41577-022-00707-2] [Citation(s) in RCA: 215] [Impact Index Per Article: 107.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2022] [Indexed: 12/13/2022]
Abstract
Antigen processing and presentation are the cornerstones of adaptive immunity. B cells cannot generate high-affinity antibodies without T cell help. CD4+ T cells, which provide such help, use antigen-specific receptors that recognize major histocompatibility complex (MHC) molecules in complex with peptide cargo. Similarly, eradication of virus-infected cells often depends on cytotoxic CD8+ T cells, which rely on the recognition of peptide-MHC complexes for their action. The two major classes of glycoproteins entrusted with antigen presentation are the MHC class I and class II molecules, which present antigenic peptides to CD8+ T cells and CD4+ T cells, respectively. This Review describes the essentials of antigen processing and presentation. These pathways are divided into six discrete steps that allow a comparison of the various means by which antigens destined for presentation are acquired and how the source proteins for these antigens are tagged for degradation, destroyed and ultimately displayed as peptides in complex with MHC molecules for T cell recognition.
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Affiliation(s)
- Novalia Pishesha
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.,Society of Fellows, Harvard University, Cambridge, MA, USA.,Klarman Cell Observatory, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Thibault J Harmand
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Hidde L Ploegh
- Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
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6
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Olsson N, Jiang W, Adler LN, Mellins ED, Elias JE. Tuning DO:DM ratios modulates MHC class II immunopeptidomes. Mol Cell Proteomics 2022; 21:100204. [DOI: 10.1016/j.mcpro.2022.100204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 01/07/2022] [Accepted: 01/16/2022] [Indexed: 10/19/2022] Open
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7
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Xu Q, Sood P, Helmick D, Lomago JS, Tevar AD, Zeevi A. Positive flow cytometry crossmatch with discrepant antibody testing results following COVID-19 vaccination. Am J Transplant 2021; 21:3785-3789. [PMID: 34241963 PMCID: PMC8441686 DOI: 10.1111/ajt.16753] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 06/29/2021] [Accepted: 06/30/2021] [Indexed: 01/25/2023]
Abstract
The impact of COVID-19 vaccination on the alloimmunity of transplant candidates is unknown. We report a case of positive B cell flow cytometry crossmatch in a patient waiting for second kidney transplantation, 37 days after receiving the COVID-19 vaccine. The preliminary crossmatch, using sample collected before COVID-19 vaccination, was negative. The antibodies to mismatched donor HLA-DR7 were detected only with multi-antigen beads but not with single-antigen beads, excluding possible prozone effects in solid-phase antibody assays. The crossmatches were positive with HLA-DR7-positive surrogates (n = 2) while negative with HLA-DR7-negative surrogates (n = 3), which confirms the HLA-DR7 alloreactivity. The antigen configurations on B lymphocytes are similar to that on the multi-antigen beads while distinct from the single-antigen beads. HLA-DR7 was the repeating mismatched antigen with the failing first kidney allograft. The newly emerged antibody to HLA-DR7 probably is the consequence of bystander activation of memory response by the COVID-19 vaccination. This case highlights the importance of verifying allo-sensitization history and utilizing multiple assays, including cell-based crossmatch and solid-phase assays with multi-antigens. COVID-19 immunization may deserve special attention when assessing the immunological risk before and after organ transplantation.
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Affiliation(s)
- Qingyong Xu
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA,Correspondence Qingyong Xu, Department of Pathology, University of Pittsburgh Medical Center, UPMC-Clinical Lab Building, Pittsburgh, PA, USA.
| | - Puneet Sood
- Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Dennis Helmick
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Jon S. Lomago
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Amit D. Tevar
- Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA,Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Adriana Zeevi
- Department of Pathology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA,Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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8
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Mathematical modeling and stochastic simulations suggest that low-affinity peptides can bisect MHC1-mediated export of high-affinity peptides into "early"- and "late"-phases. Heliyon 2021; 7:e07466. [PMID: 34286133 PMCID: PMC8278427 DOI: 10.1016/j.heliyon.2021.e07466] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/23/2021] [Accepted: 06/29/2021] [Indexed: 02/01/2023] Open
Abstract
The peptide loading complex (PLC) is a multi-protein complex of the endoplasmic reticulum (ER) which optimizes major histocompatibility I (MHC1)-mediated export of intracellular high-affinity peptides. Whilst, the molecular biology of MHC1-mediated export is well supported by empirical data, the stoichiometry, kinetics and spatio-temporal profile of the participating molecular entities are a matter of considerable debate. Here, a low-affinity peptide-driven (LAPD)-model of MHC1-mediated high-affinity peptide export is formulated, implemented, analyzed and simulated. The model is parameterized in terms of the contribution of the shunt reaction to the concentration of exportable MHC1. Theoretical analyses and simulation studies of the model suggest that low-affinity peptides can bisect MHC1-mediated export of high-affinity peptides into time-dependent distinct “early”- and “late”-phases. The net exportable MHC1 (eM1β(t)) is a function of the retrograde (rM1β(t))- and anterograde (aM1β(t))-derived fractions. The “early”-phase is dominated by the contribution of the retrograde/recyclable (rM1β≈61%,aM1β≈39%) pathway to exportable MHC1, is characterized by Tapasin-mediated peptide-editing and is ATP-independent. The “late”-phase on the other hand, is characterized by de novo PLC-assembly, rapid disassembly and a significant contribution of the anterograde pathway to exportable MHC1 (rM1β≈21%,aM1β≈79%). The shunt reaction is rate limiting and may integrate peptide translocation with PLC-assembly/disassembly thereby, regulating peptide export under physiological and pathological (viral infections, dysplastic alterations) conditions.
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9
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Brouwer MAE, Jones-Warner W, Rahman S, Kerstholt M, Ferreira AV, Oosting M, Hooiveld GJ, Netea MG, Joosten LAB. B. burgdorferi sensu lato-induced inhibition of antigen presentation is mediated by RIP1 signaling resulting in impaired functional T cell responses towards Candida albicans. Ticks Tick Borne Dis 2020; 12:101611. [PMID: 33360386 DOI: 10.1016/j.ttbdis.2020.101611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 10/22/2020] [Accepted: 11/06/2020] [Indexed: 02/06/2023]
Abstract
Antigen presentation is a crucial innate immune cell function that instructs adaptive immune cells. Loss of this pathway severely impairs the development of adaptive immune responses. To investigate whether B. burgdorferi sensu lato. spirochetes modulate the induction of an effective immune response, primary human PBMCs were isolated from healthy volunteers and stimulated with B. burgdorferi s.l. Through cell entry, TNF receptor I, and RIP1 signaling cascades, B. burgdorferi s.l. strongly downregulated genes and proteins involved in antigen presentation, specifically HLA-DM, MHC class II and CD74. Antigen presentation proteins were distinctively inhibited in monocyte subsets, monocyte-derived macrophages, and dendritic cells. When compared to a range of other pathogens, B. burgdorferi s.l.-induced suppression of antigen presentation appears to be specific. Inhibition of antigen presentation interfered with T-cell recognition of B. burgdorferi s.l., and memory T-cell responses against Candidaalbicans. Re-stimulation of PBMCs with the commensal microbe C.albicans following B. burgdorferi s.l. exposure resulted in significantly reduced IFN-γ, IL-17 and IL-22 production. These findings may explain why patients with Lyme borreliosis develop delayed adaptive immune responses. Unravelling the mechanism of B. burgdorferi s.l.-induced inhibition of antigen presentation, via cell entry, TNF receptor I, and RIP1 signaling cascades, explains the difficulty to diagnose the disease based on serology and to obtain an effective vaccine against Lyme borreliosis.
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Affiliation(s)
- Michelle A E Brouwer
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands
| | - William Jones-Warner
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands
| | - Shafaque Rahman
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands
| | - Mariska Kerstholt
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands
| | - Anaísa V Ferreira
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands; Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto, Portugal
| | - Marije Oosting
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands
| | - Guido J Hooiveld
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Wageningen, the Netherlands
| | - Mihai G Netea
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands; Department for Genomics & Immunoregulation, Life and Medical Sciences Institute (LIMES), University of Bonn, Bonn, Germany
| | - Leo A B Joosten
- Department of Internal Medicine, Radboud Center for Infectious Diseases (RCI), Radboud Institute of Molecular Life Sciences (RIMLS), Radboud University Medical Center, 6525 GA Nijmegen, the Netherlands.
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10
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Ghasemi F, Tessier TM, Gameiro SF, Maciver AH, Cecchini MJ, Mymryk JS. High MHC-II expression in Epstein-Barr virus-associated gastric cancers suggests that tumor cells serve an important role in antigen presentation. Sci Rep 2020; 10:14786. [PMID: 32901107 PMCID: PMC7479113 DOI: 10.1038/s41598-020-71775-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 08/18/2020] [Indexed: 02/06/2023] Open
Abstract
EBV-associated gastric adenocarcinomas (EBVaGCs) often exhibit better clinical outcomes than EBV negative gastric cancers (GCs), which could be related to their consistent expression of foreign viral antigens. Antigen-presenting cells (APCs) present peptide antigens in the context of the class-II major histocompatibility complex (MHC-II). During inflammatory conditions, epithelial cells express MHC-II and function as accessory APCs. Utilizing RNA-seq data from nearly 400 GC patients, we determined the impact of EBV-status on expression of MHC-II components, genes involved in their regulation, and T-cell co-stimulation. Virtually all MHC-II genes were significantly upregulated in EBVaGCs compared to normal tissues, or other GC subtypes. Genes involved in antigen presentation were also significantly upregulated in EBVaGCs, as were the key MHC-II transcriptional regulators CIITA and RFX5. This was unexpected as the EBV encoded BZLF1 protein can repress CIITA transcription and is expressed in many EBVaGCs. Furthermore, MHC-II upregulation was strongly correlated with elevated intratumoral levels of interferon-gamma. In addition, expression of co-stimulatory molecules involved in T-cell activation and survival was also significantly increased in EBVaGCs. Thus, gastric adenocarcinoma cells may functionally contribute to the highly immunogenic tumor microenvironment observed in EBVaGCs via a previously unappreciated role in interferon-induced antigen presentation.
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Affiliation(s)
- Farhad Ghasemi
- Department of Surgery, Western University, London, ON, N6A 4V2, Canada
| | - Tanner M Tessier
- Department of Microbiology and Immunology, Western University, London, ON, N6A 3K7, Canada
| | - Steven F Gameiro
- Department of Microbiology and Immunology, Western University, London, ON, N6A 3K7, Canada
| | - Allison H Maciver
- Department of Surgery, Western University, London, ON, N6A 4V2, Canada.,Department of Oncology, Western University, London, ON, N6A 3K7, Canada
| | - Matthew J Cecchini
- Department of Pathology and Laboratory Medicine, Western University and London Health Sciences Centre, London, ON, N6A 5C1, Canada
| | - Joe S Mymryk
- Department of Microbiology and Immunology, Western University, London, ON, N6A 3K7, Canada. .,Department of Oncology, Western University, London, ON, N6A 3K7, Canada. .,Department of Otolaryngology, Head & Neck Surgery, Western University, London, ON, N6A 5W9, Canada. .,London Regional Cancer Program, Lawson Health Research Institute, London, ON, N6C 2R5, Canada. .,London Regional Cancer Program, Room A4-837, 790 Commissioners Rd. East, London, ON, N6A 4L6, Canada.
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11
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Zhao D, Hajiaghamohseni LM, Liu X, Szulc ZM, Bai A, Bielawska A, Norris JS, Reddy SV, Hannun YA, Haque A. Inhibition of acid ceramidase regulates MHC class II antigen presentation and suppression of autoimmune arthritis. Cytokine 2020; 135:155219. [PMID: 32738771 DOI: 10.1016/j.cyto.2020.155219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 07/04/2020] [Accepted: 07/20/2020] [Indexed: 12/30/2022]
Abstract
The bioactive sphingolipid ceramide affects immune responses although its effect on antigen (Ag) processing and delivery by HLA class II to CD4+T-cells remains unclear. Therefore, we examined the actions of a novel cell-permeable acid ceramidase (AC) inhibitor [(1R,2R) N myristoylamino-(4'-nitrophenyl)-propandiol-1,3] on antigen presentation and inflammatory cytokine production by Ag-presenting cells (APCs) such as B-cells, macrophages, and dendritic cells. We found that AC inhibition in APCs perturbed Ag-processing and presentation via HLA-DR4 (MHC class II) proteins as measured by coculture assay and T-cell production of IL-2. Mass spectral analyses showed that B13 treatment significantly raised levels of four types of ceramides in human B-cells. B13 treatment did not alter Ag internalization and class II protein expression, but significantly inhibited lysosomal cysteinyl cathepsins (B, S and L) and thiol-reductase (GILT), HLA class II Ag-processing, and generation of functional class II-peptide complexes. Ex vivo Ag presentation assays showed that inhibition of AC impaired primary and recall CD4+T-cell responses and cytokine production in response against type II collagen. Further, B13 delayed onset and reduced severity of inflamed joints and cytokine production in the collagen-induced arthritis mouse model in vivo. These findings suggest that inhibition of AC in APCs may dysregulate endolysosomal proteases and HLA class II-associated self-antigen presentation to CD4+T-cells, attenuating inflammatory cytokine production and suppressing host autoimmune responses.
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Affiliation(s)
- Dan Zhao
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Darby Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Laela M Hajiaghamohseni
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Darby Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Xiang Liu
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Zdzislaw M Szulc
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Aiping Bai
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Alicja Bielawska
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - James S Norris
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Darby Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Sakamuri V Reddy
- Darby Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Yusuf A Hannun
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States
| | - Azizul Haque
- Department of Microbiology and Immunology, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Darby Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, United States.
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12
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Busch R, Kollnberger S, Mellins ED. HLA associations in inflammatory arthritis: emerging mechanisms and clinical implications. Nat Rev Rheumatol 2020; 15:364-381. [PMID: 31092910 DOI: 10.1038/s41584-019-0219-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Our understanding of the mechanisms underlying HLA associations with inflammatory arthritis continues to evolve. Disease associations have been refined, and interactions of HLA genotype with other genes and environmental risk factors in determining disease risk have been identified. This Review provides basic information on the genetics and molecular function of HLA molecules, as well as general features of HLA associations with disease. Evidence is discussed regarding the various peptide-dependent and peptide-independent mechanisms by which HLA alleles might contribute to the pathogenesis of three types of inflammatory arthritis: rheumatoid arthritis, spondyloarthritis and systemic juvenile idiopathic arthritis. Also discussed are HLA allelic associations that shed light on the genetic heterogeneity of inflammatory arthritides and on the relationships between adult and paediatric forms of arthritis. Clinical implications range from improved diagnosis and outcome prediction to the possibility of using HLA associations in developing personalized strategies for the treatment and prevention of these diseases.
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Affiliation(s)
- Robert Busch
- Department of Life Sciences, University of Roehampton, Whitelands College, London, UK.
| | - Simon Kollnberger
- School of Medicine, Cardiff University, UHW Main Building, Heath Park, Cardiff, UK
| | - Elizabeth D Mellins
- Department of Pediatrics, Program in Immunology, Stanford University Medical Center, Stanford, CA, USA.
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13
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Cho KJ, Ishido S, Eisenlohr LC, Roche PA. Activation of Dendritic Cells Alters the Mechanism of MHC Class II Antigen Presentation to CD4 T Cells. THE JOURNAL OF IMMUNOLOGY 2020; 204:1621-1629. [PMID: 31996461 DOI: 10.4049/jimmunol.1901234] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 12/31/2019] [Indexed: 11/19/2022]
Abstract
Both immature and mature dendritic cells (DCs) can process and present foreign Ags to CD4 T cells; however, the mechanism by which MHC class II (MHC-II) in mature DCs acquires antigenic peptides remains unknown. To address this, we have studied Ag processing and presentation of two distinct CD4 T cell epitopes of the influenza virus hemagglutinin coat protein by both immature and mature mouse DCs. We find that immature DCs almost exclusively use newly synthesized MHC-II targeted to DM+ late endosomes for presentation to influenza virus-specific CD4 T cells. By contrast, mature DCs exclusively use recycling MHC-II that traffics to both early and late endosomes for antigenic peptide binding. Rab11a knockdown partially inhibits recycling of MHC-II in mature DCs and selectively inhibits presentation of an influenza virus hemagglutinin CD4 T cell epitope generated in early endosomes. These studies highlight a "division of labor" in MHC-II peptide binding, in which immature DCs preferentially present Ags acquired in Rab11a- DM+ late endosomes, whereas mature DCs use recycling MHC-II to present antigenic peptides acquired in both Rab11a+ early endosomes and Rab11a- endosomes for CD4 T cell activation.
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Affiliation(s)
- Kyung-Jin Cho
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Satoshi Ishido
- Department of Microbiology, Hyogo College of Medicine, Nishinomiya, 663-8501 Japan
| | - Laurence C Eisenlohr
- The Children's Hospital of Philadelphia Research Institute, Philadelphia, PA 19104; and.,Perelman School of Medicine at The University of Pennsylvania, Philadelphia, PA 19104
| | - Paul A Roche
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892;
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14
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Gameiro SF, Ghasemi F, Barrett JW, Nichols AC, Mymryk JS. High Level Expression of MHC-II in HPV+ Head and Neck Cancers Suggests that Tumor Epithelial Cells Serve an Important Role as Accessory Antigen Presenting Cells. Cancers (Basel) 2019; 11:cancers11081129. [PMID: 31394808 PMCID: PMC6721589 DOI: 10.3390/cancers11081129] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 12/19/2022] Open
Abstract
High-risk human papillomaviruses (HPVs) are responsible for a subset of head and neck squamous cell carcinomas (HNSCC). Expression of class II major histocompatibility complex (MHC-II) is associated with antigen presenting cells (APCs). During inflammation, epithelial cells can be induced to express MHC-II and function as accessory APCs. Utilizing RNA-seq data from over 500 HNSCC patients from The Cancer Genome Atlas, we determined the impact of HPV-status on the expression of MHC-II genes and related genes involved in their regulation, antigen presentation, and T-cell co-stimulation. Expression of virtually all MHC-II genes was significantly upregulated in HPV+ carcinomas compared to HPV- or normal control tissue. Similarly, genes that encode products involved in antigen presentation were also significantly upregulated in the HPV+ cohort. In addition, the expression of CIITA and RFX5-regulators of MHC-II-were significantly upregulated in HPV+ tumors. This coordinated upregulation of MHC-II genes was correlated with higher intratumoral levels of interferon-gamma in HPV+ carcinomas. Furthermore, genes that encode various co-stimulatory molecules involved in T-cell activation and survival were also significantly upregulated in HPV+ tumors. Collectively, these results suggest a previously unappreciated role for epithelial cells in antigen presentation that functionally contributes to the highly immunogenic tumor microenvironment observed in HPV+ HNSCC.
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Affiliation(s)
- Steven F Gameiro
- Department of Microbiology and Immunology, The University of Western Ontario, London, ON N6A 3K7, Canada
| | - Farhad Ghasemi
- Department of Otolaryngology, Head & Neck Surgery, The University of Western Ontario, London, ON N6A 3K7, Canada
| | - John W Barrett
- Department of Otolaryngology, Head & Neck Surgery, The University of Western Ontario, London, ON N6A 3K7, Canada
| | - Anthony C Nichols
- Department of Otolaryngology, Head & Neck Surgery, The University of Western Ontario, London, ON N6A 3K7, Canada
- Department of Oncology, The University of Western Ontario, London, ON N6A 3K7, Canada
- London Regional Cancer Program, Lawson Health Research Institute, London, ON N6C 2R5, Canada
| | - Joe S Mymryk
- Department of Microbiology and Immunology, The University of Western Ontario, London, ON N6A 3K7, Canada.
- Department of Otolaryngology, Head & Neck Surgery, The University of Western Ontario, London, ON N6A 3K7, Canada.
- Department of Oncology, The University of Western Ontario, London, ON N6A 3K7, Canada.
- London Regional Cancer Program, Lawson Health Research Institute, London, ON N6C 2R5, Canada.
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15
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Demharter S, Knapp B, Deane C, Minary P. HLA-DM Stabilizes the Empty MHCII Binding Groove: A Model Using Customized Natural Move Monte Carlo. J Chem Inf Model 2019; 59:2894-2899. [PMID: 31070900 PMCID: PMC7007188 DOI: 10.1021/acs.jcim.9b00104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 11/28/2022]
Abstract
MHC class II molecules bind peptides derived from extracellular proteins that have been ingested by antigen-presenting cells and display them to the immune system. Peptide loading occurs within the antigen-presenting cell and is facilitated by HLA-DM. HLA-DM stabilizes the open conformation of the MHCII binding groove when no peptide is bound. While a structure of the MHCII/HLA-DM complex exists, the mechanism of stabilization is still largely unknown. Here, we applied customized Natural Move Monte Carlo to investigate this interaction. We found a possible long-range mechanism that implicates the configuration of the membrane-proximal globular domains in stabilizing the open state of the empty MHCII binding groove.
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Affiliation(s)
- Samuel Demharter
- Biotech
Research and Innovation Centre, University
of Copenhagen, Copenhagen 2200, Denmark
- Department
of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
| | - Bernhard Knapp
- Bioinformatics
and Immunoinformatics Research Group, Department of Basic Sciences, International University of Catalonia, 08195 Barcelona, Spain
| | - Charlotte Deane
- Protein
Informatics Group, Department of Statistics, University of Oxford, Oxford OX1 3LB, United Kingdom
| | - Peter Minary
- Department
of Computer Science, University of Oxford, Oxford OX1 3QD, United Kingdom
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16
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Hung SC, Hou T, Jiang W, Wang N, Qiao SW, Chow IT, Liu X, van der Burg SH, Koelle DM, Kwok WW, Sollid LM, Mellins ED. Epitope Selection for HLA-DQ2 Presentation: Implications for Celiac Disease and Viral Defense. THE JOURNAL OF IMMUNOLOGY 2019; 202:2558-2569. [PMID: 30926644 DOI: 10.4049/jimmunol.1801454] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 03/01/2019] [Indexed: 01/28/2023]
Abstract
We have reported that the major histocompatibility molecule HLA-DQ2 (DQA1*05:01/DQB1*02:01) (DQ2) is relatively resistant to HLA-DM (DM), a peptide exchange catalyst for MHC class II. In this study, we analyzed the role of DQ2/DM interaction in the generation of DQ2-restricted gliadin epitopes, relevant to celiac disease, or DQ2-restricted viral epitopes, relevant to host defense. We used paired human APC, differing in DM expression (DMnull versus DMhigh) or differing by expression of wild-type DQ2, versus a DM-susceptible, DQ2 point mutant DQ2α+53G. The APC pairs were compared for their ability to stimulate human CD4+ T cell clones. Despite higher DQ2 levels, DMhigh APC attenuated T cell responses compared with DMnull APC after intracellular generation of four tested gliadin epitopes. DMhigh APC expressing the DQ2α+53G mutant further suppressed these gliadin-mediated responses. The gliadin epitopes were found to have moderate affinity for DQ2, and even lower affinity for the DQ2 mutant, consistent with DM suppression of their presentation. In contrast, DMhigh APC significantly promoted the presentation of DQ2-restricted epitopes derived intracellularly from inactivated HSV type 2, influenza hemagglutinin, and human papillomavirus E7 protein. When extracellular peptide epitopes were used as Ag, the DQ2 surface levels and peptide affinity were the major regulators of T cell responses. The differential effect of DM on stimulation of the two groups of T cell clones implies differences in DQ2 presentation pathways associated with nonpathogen- and pathogen-derived Ags in vivo.
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Affiliation(s)
- Shu-Chen Hung
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305.,Program in Immunology, Stanford University, Stanford, CA 94305
| | - Tieying Hou
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305.,Program in Immunology, Stanford University, Stanford, CA 94305
| | - Wei Jiang
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305.,Program in Immunology, Stanford University, Stanford, CA 94305
| | - Nan Wang
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305.,Program in Immunology, Stanford University, Stanford, CA 94305
| | - Shuo-Wang Qiao
- Centre for Immune Regulation, Department of Immunology, University of Oslo and Oslo University Hospital, Rikshospitalet, 0372 Oslo, Norway.,K.G. Jebsen Coeliac Disease Research Centre, University of Oslo, 0424 Oslo, Norway
| | - I-Ting Chow
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101
| | - Xiaodan Liu
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305.,Program in Immunology, Stanford University, Stanford, CA 94305
| | - Sjoerd H van der Burg
- Department of Medical Oncology, Leiden University Medical Center, 2333 ZA Leiden, the Netherlands
| | - David M Koelle
- Department of Medicine, University of Washington, Seattle, WA 98195.,Department of Laboratory Medicine, University of Washington, Seattle, WA 98195; and.,Department of Global Health, University of Washington, Seattle, WA 98195
| | - William W Kwok
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101
| | - Ludvig M Sollid
- Centre for Immune Regulation, Department of Immunology, University of Oslo and Oslo University Hospital, Rikshospitalet, 0372 Oslo, Norway.,K.G. Jebsen Coeliac Disease Research Centre, University of Oslo, 0424 Oslo, Norway
| | - Elizabeth D Mellins
- Division of Human Gene Therapy, Department of Pediatrics, Stanford University, Stanford, CA 94305; .,Program in Immunology, Stanford University, Stanford, CA 94305
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17
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Thibodeau J, Moulefera MA, Balthazard R. On the structure–function of MHC class II molecules and how single amino acid polymorphisms could alter intracellular trafficking. Hum Immunol 2019; 80:15-31. [DOI: 10.1016/j.humimm.2018.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 09/25/2018] [Accepted: 10/01/2018] [Indexed: 12/01/2022]
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18
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Bakela K, Athanassakis I. Soluble major histocompatibility complex molecules in immune regulation: highlighting class II antigens. Immunology 2018; 153:315-324. [PMID: 29159903 PMCID: PMC5795187 DOI: 10.1111/imm.12868] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 11/09/2017] [Accepted: 11/14/2017] [Indexed: 01/10/2023] Open
Abstract
The involvement of major histocompatibility complex (MHC) antigens in the development and regulation of immune response has been well defined over the years, starting from maturation, antigenic peptide loading, migration to the cell membrane for recognition by the T-cell receptor and recycling for immune response cessation. During this intracellular trafficking, MHC antigens find a way to be excreted by the cells, because they can be found as soluble MHC class I (sMHC-I) and class II (sMHC-II) molecules in all body fluids. Although secretion mechanisms have not been sufficiently studied, sMHC molecules have been shown to display important immunoregulatory properties. Their levels in the serum have been shown to be altered in a variety of diseases, including viral infections, inflammation, autoimmunities and cancer, etc. while they seem to be involved in a number of physiological reactions, including maintenance of tolerance, reproduction, as well as mate choice vis-à-vis species evolution. The present review aims to present the thus far existing literature on sMHC molecules and point out the importance of these molecules in the maintenance of immune homeostasis.
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Affiliation(s)
- Katerina Bakela
- Laboratory of ImmunologyDepartment of BiologyUniversity of CreteHeraklion, CreteGreece
| | - Irene Athanassakis
- Laboratory of ImmunologyDepartment of BiologyUniversity of CreteHeraklion, CreteGreece
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19
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Alvaro-Benito M, Morrison E, Wieczorek M, Sticht J, Freund C. Human leukocyte Antigen-DM polymorphisms in autoimmune diseases. Open Biol 2017; 6:rsob.160165. [PMID: 27534821 PMCID: PMC5008016 DOI: 10.1098/rsob.160165] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 07/19/2016] [Indexed: 12/20/2022] Open
Abstract
Classical MHC class II (MHCII) proteins present peptides for CD4+ T-cell surveillance and are by far the most prominent risk factor for a number of autoimmune disorders. To date, many studies have shown that this link between particular MHCII alleles and disease depends on the MHCII's particular ability to bind and present certain peptides in specific physiological contexts. However, less attention has been paid to the non-classical MHCII molecule human leucocyte antigen-DM, which catalyses peptide exchange on classical MHCII proteins acting as a peptide editor. DM function impacts the presentation of both antigenic peptides in the periphery and key self-peptides during T-cell development in the thymus. In this way, DM activity directly influences the response to pathogens, as well as mechanisms of self-tolerance acquisition. While decreased DM editing of particular MHCII proteins has been proposed to be related to autoimmune disorders, no experimental evidence for different DM catalytic properties had been reported until recently. Biochemical and structural investigations, together with new animal models of loss of DM activity, have provided an attractive foundation for identifying different catalytic efficiencies for DM allotypes. Here, we revisit the current knowledge of DM function and discuss how DM function may impart autoimmunity at the organism level.
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Affiliation(s)
- Miguel Alvaro-Benito
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Eliot Morrison
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Marek Wieczorek
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Jana Sticht
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Christian Freund
- Protein Biochemistry Group, Institute for Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Berlin, Germany
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20
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The MHC class II antigen presentation pathway in human monocytes differs by subset and is regulated by cytokines. PLoS One 2017; 12:e0183594. [PMID: 28832681 PMCID: PMC5568224 DOI: 10.1371/journal.pone.0183594] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 08/07/2017] [Indexed: 01/12/2023] Open
Abstract
Monocytes play a critical role in the innate and adaptive immune systems, performing phagocytosis, presenting antigen, and producing cytokines. They are a heterogeneous population that has been divided in humans into classical, intermediate, and non-classical subsets, but the roles of these subsets are incompletely understood. In this study, we investigated the expression patterns of MHC class II (MHCII) and associated molecules and find that the intermediate monocytes express the highest levels of the MHC molecules, HLA-DR (tested in n = 30 samples), HLA-DP (n = 30), and HLA-DQ (n = 10). HLA-DM (n = 30), which catalyzes the peptide exchange on the MHC molecules, is also expressed at the highest levels in intermediate monocytes. To measure HLA-DM function, we measured levels of MHCII-bound CLIP (class II invariant chain peptide, n = 23), which is exchanged for other peptides by HLA-DM. We calculated CLIP:MHCII ratios to normalize CLIP levels to MHCII levels, and found that intermediate monocytes have the lowest CLIP:MHCII ratio. We isolated the different monocyte subsets (in a total of 7 samples) and analyzed their responses to selected cytokines as model of monocyte activation: two M1-polarizing cytokines (IFNγ, GM-CSF), an M2-polarizing cytokine (IL-4) and IL-10. Classical monocytes exhibit the largest increases in class II pathway expression in response to stimulatory cytokines (IFNγ, GM-CSF, IL-4). All three subsets decrease HLA-DR levels after IL-10 exposure. Our findings argue that intermediate monocytes are the most efficient constitutive antigen presenting subset, that classical monocytes are recruited into an antigen presentation role during inflammatory responses and that IL-10 negatively regulates this function across all subsets.
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21
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CD9 Regulates Major Histocompatibility Complex Class II Trafficking in Monocyte-Derived Dendritic Cells. Mol Cell Biol 2017; 37:MCB.00202-17. [PMID: 28533221 DOI: 10.1128/mcb.00202-17] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 05/18/2017] [Indexed: 11/20/2022] Open
Abstract
Antigen presentation by dendritic cells (DCs) stimulates naive CD4+ T cells, triggering T cell activation and the adaptive arm of the immune response. Newly synthesized major histocompatibility complex class II (MHC-II) molecules accumulate at MHC-II-enriched endosomal compartments and are transported to the plasma membrane of DCs after binding to antigenic peptides to enable antigen presentation. In DCs, MHC-II molecules are included in tetraspanin-enriched microdomains (TEMs). However, the role of tetraspanin CD9 in these processes remains largely undefined. Here, we show that CD9 regulates the T cell-stimulatory capacity of granulocyte-macrophage colony-stimulating factor (GM-CSF)-dependent bone marrow-derived DCs (BMDCs), without affecting antigen presentation by fms-like tyrosine kinase 3 ligand (Flt3L)-dependent BMDCs. CD9 knockout (KO) GM-CSF-dependent BMDCs, which resemble monocyte-derived DCs (MoDCs), induce lower levels of T cell activation than wild-type DCs, and this effect is related to a reduction in MHC-II surface expression in CD9-deficient MoDCs. Importantly, MHC-II targeting to the plasma membrane is largely impaired in immature CD9 KO MoDCs, in which MHC-II remains arrested in acidic intracellular compartments enriched in LAMP-1 (lysosome-associated membrane protein 1), and MHC-II internalization is also blocked. Moreover, CD9 participates in MHC-II trafficking in mature MoDCs, regulating its endocytosis and recycling. Our results demonstrate that the tetraspanin CD9 specifically regulates antigenic presentation in MoDCs through the regulation of MHC-II intracellular trafficking.
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22
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Zhao T, Bernstein KE, Fang J, Shen XZ. Angiotensin-converting enzyme affects the presentation of MHC class II antigens. J Transl Med 2017; 97:764-771. [PMID: 28394320 PMCID: PMC5493495 DOI: 10.1038/labinvest.2017.32] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 02/09/2017] [Accepted: 02/23/2017] [Indexed: 11/12/2022] Open
Abstract
Antigen processing and presentation through the MHC class II pathway is critical for activating T helper cells. Angiotensin-converting enzyme (ACE) is a carboxyl peptidase expressed by antigen-presenting cells. By analysis of ACE null (knockout), wild-type, and ACE-overexpressing (ACE10) mice and the antigen-presenting cells derived from these mice, we found that ACE has a physiological role in the processing of peptides for MHC class II presentation. The efficiency of presenting MHC class II epitopes from ovalbumin (OVA) and hen egg lysosome is markedly affected by cellular ACE levels. Mice overexpressing ACE in myeloid cells have a much more vigorous CD4+ T-cell and antibody response when immunized with OVA. ACE is present in the endosomal pathway where MHC class II peptide processing and loading occur. The efficiency of MHC class II antigen presentation can be altered by ACE overexpression or ACE pharmacological inhibition. Thus, ACE is a dynamic participant in processing MHC class II peptides. Manipulation of ACE expression by antigen-presenting cells may prove to be a novel strategy to alter the immune response.
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Affiliation(s)
- Tuantuan Zhao
- School of Life Sciences and Technology, Tongji University, Shanghai, China, 200234,Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, U.S.A.90048
| | - Kenneth E. Bernstein
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, U.S.A.90048
| | - Jianmin Fang
- School of Life Sciences and Technology, Tongji University, Shanghai, China, 200234,Correspondence: (X.Z.S), (J.F.)
| | - Xiao Z. Shen
- Department of Physiology, School of Medicine, Zhejiang University, Hangzhou, China,310058,Correspondence: (X.Z.S), (J.F.)
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23
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Adler LN, Jiang W, Bhamidipati K, Millican M, Macaubas C, Hung SC, Mellins ED. The Other Function: Class II-Restricted Antigen Presentation by B Cells. Front Immunol 2017; 8:319. [PMID: 28386257 PMCID: PMC5362600 DOI: 10.3389/fimmu.2017.00319] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 03/07/2017] [Indexed: 12/31/2022] Open
Abstract
Mature B lymphocytes (B cells) recognize antigens using their B cell receptor (BCR) and are activated to become antibody-producing cells. In addition, and integral to the development of a high-affinity antibodies, B cells utilize the specialized major histocompatibility complex class II (MHCII) antigen presentation pathway to process BCR-bound and internalized protein antigens and present selected peptides in complex with MHCII to CD4+ T cells. This interaction influences the fate of both types of lymphocytes and shapes immune outcomes. Specific, effective, and optimally timed antigen presentation by B cells requires well-controlled intracellular machinery, often regulated by the combined effects of several molecular events. Here, we delineate and summarize these events in four steps along the antigen presentation pathway: (1) antigen capture and uptake by B cells; (2) intersection of internalized antigen/BCRs complexes with MHCII in peptide-loading compartments; (3) generation and regulation of MHCII/peptide complexes; and (4) exocytic transport for presentation of MHCII/peptide complexes at the surface of B cells. Finally, we discuss modulation of the MHCII presentation pathway across B cell development and maturation to effector cells, with an emphasis on the shaping of the MHCII/peptide repertoire by two key antigen presentation regulators in B cells: HLA-DM and HLA-DO.
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Affiliation(s)
- Lital N Adler
- Department of Pediatrics, Stanford University, Stanford, CA, USA; Program in Immunology, Stanford University, Stanford, CA, USA
| | - Wei Jiang
- Department of Pediatrics, Stanford University, Stanford, CA, USA; Program in Immunology, Stanford University, Stanford, CA, USA
| | | | | | - Claudia Macaubas
- Department of Pediatrics, Stanford University, Stanford, CA, USA; Program in Immunology, Stanford University, Stanford, CA, USA
| | - Shu-Chen Hung
- Department of Pediatrics, Stanford University, Stanford, CA, USA; Program in Immunology, Stanford University, Stanford, CA, USA
| | - Elizabeth D Mellins
- Department of Pediatrics, Stanford University, Stanford, CA, USA; Program in Immunology, Stanford University, Stanford, CA, USA
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24
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Georgouli M, Papadimitriou L, Glymenaki M, Patsaki V, Athanassakis I. Expression of MIF and CD74 in leukemic cell lines: correlation to DR expression destiny. Biol Chem 2016; 397:519-28. [PMID: 26866879 DOI: 10.1515/hsz-2015-0280] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 02/04/2016] [Indexed: 12/17/2022]
Abstract
Invariant chain (Ii) or CD74 is a non-polymorphic glycoprotein, which apart from its role as a chaperone dedicated to MHCII molecules, is known to be a high-affinity receptor for macrophage migration inhibitory factor (MIF). The present study aimed to define the roles of CD74 and MIF in the immune surveillance escape process. Towards this direction, the cell lines HL-60, Raji, K562 and primary pre-B leukemic cells were examined for expression and secretion of MIF. Flow cytometry analysis detected high levels of MIF and intracellular/membrane CD74 expression in all leukemic cells tested, while MIF secretion was shown to be inversely proportional to intracellular HLA-DR (DR) expression. In the MHCII-negative cells, IFN-γ increased MIF expression and induced its secretion in HL-60 and K562 cells, respectively. In K562 cells, CD74 (Iip33Iip35) was shown to co-precipitate with HLA-DOβ (DOβ), inhibiting thus MIF or DR binding. Induced expression of DOα in K562 (DOα-DOβ+) cells in different transfection combinations decreased MIF expression and secretion, while increasing surface DR expression. Thus, MIF could indeed be part of the antigen presentation process.
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25
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Salao K, Jiang L, Li H, Tsai VWW, Husaini Y, Curmi PMG, Brown LJ, Brown DA, Breit SN. CLIC1 regulates dendritic cell antigen processing and presentation by modulating phagosome acidification and proteolysis. Biol Open 2016; 5:620-30. [PMID: 27113959 PMCID: PMC4874360 DOI: 10.1242/bio.018119] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Intracellular chloride channel protein 1 (CLIC1) participates in inflammatory processes by regulating macrophage phagosomal functions such as pH and proteolysis. Here, we sought to determine if CLIC1 can regulate adaptive immunity by actions on dendritic cells (DCs), the key professional antigen presenting cells. To do this, we first generated bone marrow-derived DCs (BMDCs) from germline CLIC1 gene-deleted (CLIC1−/−) and wild-type (CLIC1+/+) mice, then studied them in vitro and in vivo. We found phagocytosis triggered cytoplasmic CLIC1 translocation to the phagosomal membrane where it regulated phagosomal pH and proteolysis. Phagosomes from CLIC1−/− BMDCs displayed impaired acidification and proteolysis, which could be reproduced if CLIC1+/+, but not CLIC1−/− cells, were treated with IAA94, a CLIC family ion channel blocker. CLIC1−/− BMDC displayed reduced in vitro antigen processing and presentation of full-length myelin oligodendrocyte glycoprotein (MOG) and reduced MOG-induced experimental autoimmune encephalomyelitis. These data suggest that CLIC1 regulates DC phagosomal pH to ensure optimal processing of antigen for presentation to antigen-specific T-cells. Further, they indicate that CLIC1 is a novel therapeutic target to help reduce the adaptive immune response in autoimmune diseases. Summary: DC phagosomes from CLIC1−/− mice display impaired acidification and in vivo and in vitro antigen processing and presentation, revealing CLIC1−/− as a potential therapeutic target in reducing the adaptive immune response in autoimmune diseases.
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Affiliation(s)
- Kanin Salao
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Lele Jiang
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Hui Li
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Vicky W-W Tsai
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Yasmin Husaini
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Paul M G Curmi
- School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Louise J Brown
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | - David A Brown
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
| | - Samuel N Breit
- St Vincent's Centre for Applied Medical Research, St. Vincent's Hospital and University of New South Wales, Sydney, New South Wales 2010, Australia
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Miller MA, Ganesan APV, Luckashenak N, Mendonca M, Eisenlohr LC. Endogenous antigen processing drives the primary CD4+ T cell response to influenza. Nat Med 2015; 21:1216-22. [PMID: 26413780 PMCID: PMC4629989 DOI: 10.1038/nm.3958] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Accepted: 08/28/2015] [Indexed: 12/12/2022]
Abstract
By convention, CD4+ T lymphocytes recognize foreign and self peptides derived from internalized antigens in combination with MHC class II molecules. Alternative pathways of epitope production have been identified but their contributions to host defense have not been established. We show here in a mouse infection model that the CD4+ T cell response to influenza, critical for durable protection from the virus, is driven principally by unconventional processing of antigen synthesized within the infected antigen-presenting cell, not by classical processing of endocytosed virions or material from infected cells. Investigation of the cellular components involved, including the H2-M molecular chaperone, the proteasome, and gamma-interferon inducible lysosomal thiol reductase revealed considerable heterogeneity in the generation of individual epitopes, an arrangement that ensures peptide diversity and broad CD4+ T cell engagement. These results could fundamentally revise strategies for rational vaccine design and may lead to key insights into the induction of autoimmune and anti-tumor responses.
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Affiliation(s)
- Michael A Miller
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Asha Purnima V Ganesan
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Nancy Luckashenak
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Mark Mendonca
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Laurence C Eisenlohr
- Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
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Associations of human leukocyte antigens with autoimmune diseases: challenges in identifying the mechanism. J Hum Genet 2015; 60:697-702. [PMID: 26290149 DOI: 10.1038/jhg.2015.100] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 07/22/2015] [Accepted: 07/23/2015] [Indexed: 12/24/2022]
Abstract
The mechanism of genetic associations between human leukocyte antigen (HLA) and susceptibility to autoimmune disorders has remained elusive for most of the diseases, including rheumatoid arthritis (RA) and type 1 diabetes (T1D), for which both the genetic associations and pathogenic mechanisms have been extensively analyzed. In this review, we summarize what are currently known about the mechanisms of HLA associations with RA and T1D, and elucidate the potential mechanistic basis of the HLA-autoimmunity associations. In RA, the established association between the shared epitope (SE) and RA risk has been explained, at least in part, by the involvement of SE in the presentation of citrullinated peptides, as confirmed by the structural analysis of DR4-citrullinated peptide complex. Self-peptide(s) that might explain the predispositions of variants at 11β and 13β in DRB1 to RA risk have not currently been identified. Regarding the mechanism of T1D, pancreatic self-peptides that are presented weakly on the susceptible HLA allele products are recognized by self-reactive T cells. Other studies have revealed that DQ proteins encoded by the T1D susceptible DQ haplotypes are intrinsically unstable. These findings indicate that the T1D susceptible DQ haplotypes might confer risk for T1D by facilitating the formation of unstable HLA-self-peptide complex. The studies of RA and T1D reveal the two distinct mechanistic basis that might operate in the HLA-autoimmunity associations. Combination of these mechanisms, together with other functional variations among the DR and DQ alleles, may generate the complex patterns of DR-DQ haplotype associations with autoimmunity.
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28
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The ins and outs of MHC class II-mediated antigen processing and presentation. Nat Rev Immunol 2015; 15:203-16. [PMID: 25720354 DOI: 10.1038/nri3818] [Citation(s) in RCA: 645] [Impact Index Per Article: 71.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Antigenic peptide-loaded MHC class II molecules (peptide-MHC class II) are constitutively expressed on the surface of professional antigen-presenting cells (APCs), including dendritic cells, B cells, macrophages and thymic epithelial cells, and are presented to antigen-specific CD4(+) T cells. The mechanisms of antigen uptake, the nature of the antigen processing compartments and the lifetime of cell surface peptide-MHC class II complexes can vary depending on the type of APC. It is likely that these differences are important for the function of each distinct APC subset in the generation of effective adaptive immune responses. In this Review, we describe our current knowledge of the mechanisms of uptake and processing of antigens, the intracellular formation of peptide-MHC class II complexes, the intracellular trafficking of peptide-MHC class II complexes to the APC plasma membrane and their ultimate degradation.
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God JM, Cameron C, Figueroa J, Amria S, Hossain A, Kempkes B, Bornkamm GW, Stuart RK, Blum JS, Haque A. Elevation of c-MYC disrupts HLA class II-mediated immune recognition of human B cell tumors. THE JOURNAL OF IMMUNOLOGY 2015; 194:1434-45. [PMID: 25595783 DOI: 10.4049/jimmunol.1402382] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Elevated levels of the transcription factor c-myc are strongly associated with various cancers, and in particular B cell lymphomas. Although many of c-MYC's functions have been elucidated, its effect on the presentation of Ag through the HLA class II pathway has not been reported previously. This is an issue of considerable importance, given the low immunogenicity of many c-MYC-positive tumors. We report in this paper that increased c-MYC expression has a negative effect on the ability of B cell lymphomas to functionally present Ags/peptides to CD4(+) T cells. This defect was associated with alterations in the expression of distinct cofactors as well as interactions of antigenic peptides with class II molecules required for the presentation of class II-peptide complexes and T cell engagement. Using early passage Burkitt's lymphoma (BL) tumors and transformed cells, we show that compared with B lymphoblasts, BL cells express decreased levels of the class II editor HLA-DM, lysosomal thiol-reductase GILT, and a 47-kDa enolase-like protein. Functional Ag presentation was partially restored in BL cells treated with a c-MYC inhibitor, demonstrating the impact of this oncogene on Ag recognition. This restoration of HLA class II-mediated Ag presentation in early passage BL tumors/cells was linked to enhanced HLA-DM expression and a concurrent decrease in HLA-DO in BL cells. Taken together, these results reveal c-MYC exerts suppressive effects at several critical checkpoints in Ag presentation, which contribute to the immunoevasive properties of BL tumors.
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Affiliation(s)
- Jason M God
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425
| | - Christine Cameron
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425
| | - Janette Figueroa
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425
| | - Shereen Amria
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425
| | - Azim Hossain
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425
| | - Bettina Kempkes
- Department of Gene Vectors, German Research Center for Environmental Health, 81377 Munich, Germany
| | - Georg W Bornkamm
- Institute of Clinical Molecular Biology and Tumor Genetics, German Research Center for Environmental Health, 81377 Munich, Germany
| | - Robert K Stuart
- Department of Hematology and Oncology, Medical University of South Carolina, Charleston, SC 29425; and
| | - Janice S Blum
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN 46202
| | - Azizul Haque
- Department of Microbiology and Immunology, Hollings Cancer Center and Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425;
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Álvaro-Benito M, Wieczorek M, Sticht J, Kipar C, Freund C. HLA-DMA polymorphisms differentially affect MHC class II peptide loading. THE JOURNAL OF IMMUNOLOGY 2014; 194:803-16. [PMID: 25505276 DOI: 10.4049/jimmunol.1401389] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
During the adaptive immune response, MHCII proteins display antigenic peptides on the cell surface of APCs for CD4(+) T cell surveillance. HLA-DM, a nonclassical MHCII protein, acts as a peptide exchange catalyst for MHCII, editing the peptide repertoire. Although they map to the same gene locus, MHCII proteins exhibit a high degree of polymorphism, whereas only low variability has been observed for HLA-DM. As HLA-DM activity directly favors immunodominant peptide presentation, polymorphisms in HLA-DM (DMA or DMB chain) might well be a contributing risk factor for autoimmunity and immune disorders. Our systematic comparison of DMA*0103/DMB*0101 (DMA-G155A and DMA-R184H) with DMA*0101/DMB*0101 in terms of catalyzed peptide exchange and dissociation, as well as direct interaction with several HLA-DR/peptide complexes, reveals an attenuated catalytic activity of DMA*0103/DMB*0101. The G155A substitution dominates the catalytic behavior of DMA*0103/DMB*0101 by decreasing peptide release velocity. Preloaded peptide-MHCII complexes exhibit ∼2-fold increase in half-life in the presence of DMA*0103/DMB*0101 when compared with DMA*0101/DMB*0101. We show that this effect leads to a greater persistence of autoimmunity-related Ags in the presence of high-affinity competitor peptide. Our study therefore reveals that HLA-DM polymorphic residues have a considerable impact on HLA-DM catalytic activity.
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Affiliation(s)
- Miguel Álvaro-Benito
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany; and
| | - Marek Wieczorek
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany; and Leibniz Institute for Molecular Pharmacology, 13125 Berlin, Germany
| | - Jana Sticht
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany; and
| | - Claudia Kipar
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany; and
| | - Christian Freund
- Institut für Chemie und Biochemie, Freie Universität Berlin, 14195 Berlin, Germany; and Leibniz Institute for Molecular Pharmacology, 13125 Berlin, Germany
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Miyadera H, Ohashi J, Lernmark Å, Kitamura T, Tokunaga K. Cell-surface MHC density profiling reveals instability of autoimmunity-associated HLA. J Clin Invest 2014; 125:275-91. [PMID: 25485681 DOI: 10.1172/jci74961] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 11/06/2014] [Indexed: 12/17/2022] Open
Abstract
Polymorphisms within HLA gene loci are strongly associated with susceptibility to autoimmune disorders; however, it is not clear how genetic variations in these loci confer a disease risk. Here, we devised a cell-surface MHC expression assay to detect allelic differences in the intrinsic stability of HLA-DQ proteins. We found extreme variation in cell-surface MHC density among HLA-DQ alleles, indicating a dynamic allelic hierarchy in the intrinsic stability of HLA-DQ proteins. Using the case-control data for type 1 diabetes (T1D) for the Swedish and Japanese populations, we determined that T1D risk-associated HLA-DQ haplotypes, which also increase risk for autoimmune endocrinopathies and other autoimmune disorders, encode unstable proteins, whereas the T1D-protective haplotypes encode the most stable HLA-DQ proteins. Among the amino acid variants of HLA-DQ, alterations in 47α, the residue that is located on the outside of the peptide-binding groove and acts as a key stability regulator, showed strong association with T1D. Evolutionary analysis suggested that 47α variants have been the target of positive diversifying selection. Our study demonstrates a steep allelic hierarchy in the intrinsic stability of HLA-DQ that is associated with T1D risk and protection, suggesting that HLA instability mediates the development of autoimmune disorders.
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32
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Liu YH, Lin JY. Recent advances of cluster of differentiation 74 in cancer. World J Immunol 2014; 4:174-184. [DOI: 10.5411/wji.v4.i3.174] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 06/03/2014] [Accepted: 07/29/2014] [Indexed: 02/05/2023] Open
Abstract
Cluster of differentiation 74 (CD74) performs multiple roles in B cells, T cells, and antigen-presenting cells within the immune system; it also participates in major histocompatibility complex class II-restricted antigen presentation and inflammation. Recently, a role for CD74 in carcinogenesis has been described. CD74 promotes cell proliferation and motility and prevents cell death in a macrophage migration inhibitory factor-dependent manner. Its roles as an accessory signal receptor on the cell surface and the ability to interact with other signaling molecules make CD74 an attractive therapeutic target for the treatment of cancer. This review focuses on the original role of CD74 in the immune system and its emerging tumor-related functions. First, the structure of CD74 will be summarized. Second, the current understandings about the expression, cellular localization, molecular mechanisms and signaling pathways of CD74 in immunity and cancer will be reviewed. Third, the examples that suggest CD74 is a promising molecular therapeutic target are reviewed and discussed. Although the safety and efficacy of CD74-targeted strategies are under development, deeply understanding of the regulation of CD74 will hold promise for the use of CD74 as a therapeutic target and may develop the CD74-targeted therapeutic agents such as neutralized antibody and compounds.
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33
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Macmillan H, Strohman MJ, Ayyangar S, Jiang W, Rajasekaran N, Spura A, Hessell AJ, Madec AM, Mellins ED. The MHC class II cofactor HLA-DM interacts with Ig in B cells. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 193:2641-2650. [PMID: 25098292 PMCID: PMC4157100 DOI: 10.4049/jimmunol.1400075] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
B cells internalize extracellular Ag into endosomes using the Ig component of the BCR. In endosomes, Ag-derived peptides are loaded onto MHC class II proteins. How these pathways intersect remains unclear. We find that HLA-DM (DM), a catalyst for MHC class II peptide loading, coprecipitates with Ig in lysates from human tonsillar B cells and B cell lines. The molecules in the Ig/DM complexes have mature glycans, and the complexes colocalize with endosomal markers in intact cells. A larger fraction of Ig precipitates with DM after BCR crosslinking, implying that complexes can form when DM meets endocytosed Ig. In vitro, in the endosomal pH range, soluble DM directly binds the Ig Fab domain and increases levels of free Ag released from immune complexes. Taken together, these results argue that DM and Ig intersect in the endocytic pathway of B cells with potential functional consequences.
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Affiliation(s)
- Henriette Macmillan
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Michael J. Strohman
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sashi Ayyangar
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Wei Jiang
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Narendiran Rajasekaran
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Armin Spura
- Life Technologies, South San Francisco, CA 94080, USA
| | - Ann J. Hessell
- Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006, USA
| | | | - Elizabeth D. Mellins
- Department of Pediatrics, Program in Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
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Murshid A, Gong J, Calderwood SK. Hsp90-peptide complexes stimulate antigen presentation through the class II pathway after binding scavenger receptor SREC-I. Immunobiology 2014; 219:924-31. [PMID: 25155057 DOI: 10.1016/j.imbio.2014.08.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/31/2014] [Accepted: 08/03/2014] [Indexed: 10/24/2022]
Abstract
Molecular chaperones such as heat shock protein 90 (Hsp90) have been shown to form complexes with tumor antigens and can be used to prepare anticancer vaccines largely due to this property. Earlier studies had suggested that mice immunized with a molecular chaperone-based vaccine derived from tumors became immune to further vaccination and that both CD8(+) and CD4(+) T cells were activated by the chaperone vaccine in a manner dependent on scavenger receptor SREC-I. Here we have investigated mechanisms whereby SREC-I might facilitate uptake of Hsp90-conjugated peptides by APC into the MHC class II pathway for presentation to CD4(+) T cells. Our studies showed that antigenic peptides associated with Hsp90 were taken up into the class II pathway by a mechanism dependent on SREC-I binding and internalization and presented to CD4(+) T cells. In addition our studies showed that SREC-I could associate with MHC class II molecules on the cell surface and in intracellular endosomes, suggesting a mechanism involving facilitated uptake of peptides into the MHC class II pathway. These studies in addition to our earlier findings showed SREC-I to play a primary role in chaperone-associated antigen uptake both through cross priming of MHC class I molecules and entry into the class II pathway.
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Affiliation(s)
- Ayesha Murshid
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston MA02215, United States
| | | | - Stuart K Calderwood
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston MA02215, United States.
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35
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Butler MO, Hirano N. Human cell-based artificial antigen-presenting cells for cancer immunotherapy. Immunol Rev 2014; 257:191-209. [PMID: 24329798 DOI: 10.1111/imr.12129] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Adoptive T-cell therapy, where anti-tumor T cells are first prepared in vitro, is attractive since it facilitates the delivery of essential signals to selected subsets of anti-tumor T cells without unfavorable immunoregulatory issues that exist in tumor-bearing hosts. Recent clinical trials have demonstrated that anti-tumor adoptive T-cell therapy, i.e. infusion of tumor-specific T cells, can induce clinically relevant and sustained responses in patients with advanced cancer. The goal of adoptive cell therapy is to establish anti-tumor immunologic memory, which can result in life-long rejection of tumor cells in patients. To achieve this goal, during the process of in vitro expansion, T-cell grafts used in adoptive T-cell therapy must be appropriately educated and equipped with the capacity to accomplish multiple, essential tasks. Adoptively transferred T cells must be endowed, prior to infusion, with the ability to efficiently engraft, expand, persist, and traffic to tumor in vivo. As a strategy to consistently generate T-cell grafts with these capabilities, artificial antigen-presenting cells have been developed to deliver the proper signals necessary to T cells to enable optimal adoptive cell therapy.
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Affiliation(s)
- Marcus O Butler
- Immune Therapy Program, Campbell Family Institute for Breast Cancer Research, Campbell Family Cancer Research Institute, Princess Margaret Cancer Centre, Toronto, ON, Canada; Department of Medicine, University of Toronto, Toronto, ON, Canada
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36
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Birkholz J, Doganci A, Darstein C, Gehring S, Zepp F, Meyer CU. IL-27 improves migrational and antiviral potential of CB dendritic cells. Hum Immunol 2014; 75:584-91. [PMID: 24530744 DOI: 10.1016/j.humimm.2014.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 01/03/2014] [Accepted: 02/04/2014] [Indexed: 11/18/2022]
Abstract
Interleukin (IL)-27 is known to be increased considerably in cord blood (CB) dendritic cells (DCs) after TLR ligation. Previously, we demonstrated that also basal IL-27 levels are higher in CB DCs. Here, we examined effects of IL-27 on monocyte derived dendritic cells (moDCs) to approach its particular role in the specialized immune system of the human neonate. Exogenous IL-27 promotes IL-27 transcription in CB and adult blood (AB) moDCs. IL-27 acts on CB moDCs primarily by significantly augmenting IL-27 protein, secondarily by increasing transcription of CXCL10 among other chemokines, chemokine receptor CCR1, interferon stimulated genes, transcription factor IRF8 and genes involved in antigen presentation. Furthermore, CB moDCs respond to IL-27 with augmented IL-8 and Tumor necrosis factor (TNF)-α. The results suggest that IL-27 enhances migrational and antiviral properties of CB dendritic cells.
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Affiliation(s)
- Julia Birkholz
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany.
| | - Aysefa Doganci
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany
| | - Claudia Darstein
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany
| | - Stephan Gehring
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany
| | - Fred Zepp
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany
| | - Claudius U Meyer
- Pediatric Immunology Mainz, Children's Hospital, Medical Center of the Johannes Gutenberg University Mainz, Germany
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37
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Sant AJ, Chaves FA, Krafcik FR, Lazarski CA, Menges P, Richards K, Weaver JM. Immunodominance in CD4 T-cell responses: implications for immune responses to influenza virus and for vaccine design. Expert Rev Vaccines 2014; 6:357-68. [PMID: 17542751 DOI: 10.1586/14760584.6.3.357] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
CD4 T cells play a primary role in regulating immune responses to pathogenic organisms and to vaccines. Antigen-specific CD4 T cells provide cognate help to B cells, a requisite event for immunoglobulin switch and affinity maturation of B cells that produce neutralizing antibodies and also provide help to cytotoxic CD8 T cells, critical for their expansion and persistence as memory cells. Finally, CD4 T cells may participate directly in pathogen clearance via cell-mediated cytotoxicity or through production of cytokines. Understanding the role of CD4 T-cell immunity to viruses and other pathogens, as well as evaluation of the efficacy of vaccines, requires insight into the specificity of CD4 T cells. This review focuses on the events within antigen-presenting cells that focus CD4 T cells toward a limited number of peptide antigens within the pathogen or vaccine. The molecular events are discussed in light of the special challenges that the influenza virus poses, owing to the high degree of genetic variability, unpredictable pathogenicity and the repeated encounters that human populations face with this highly infectious pathogenic organism.
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Affiliation(s)
- Andrea J Sant
- David H Smith Center for Vaccine Biology and Immunology, Aab Institute and Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA.
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38
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Falfán-Valencia R, Camarena Á, Pineda CL, Montaño M, Juárez A, Buendía-Roldán I, Pérez-Rubio G, Reséndiz-Hernández JM, Páramo I, Vega A, Granados J, Zúñiga J, Selman M. Genetic susceptibility to multicase hypersensitivity pneumonitis is associated with the TNF-238 GG genotype of the promoter region and HLA-DRB1*04 bearing HLA haplotypes. Respir Med 2014; 108:211-7. [DOI: 10.1016/j.rmed.2013.11.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 10/12/2013] [Accepted: 11/07/2013] [Indexed: 01/30/2023]
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Clement CC, Santambrogio L. The lymph self-antigen repertoire. Front Immunol 2013; 4:424. [PMID: 24379811 PMCID: PMC3864156 DOI: 10.3389/fimmu.2013.00424] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 11/20/2013] [Indexed: 01/26/2023] Open
Abstract
The lymphatic fluid originates from the interstitial fluid which bathes every parenchymal organ and reflects the “omic” composition of the tissue from which it originates in its physiological or pathological signature. Several recent proteomic analyses have mapped the proteome-degradome and peptidome of this immunologically relevant fluid pointing to the lymph as an important source of tissue-derived self-antigens. A vast array of lymph-circulating peptides have been mapped deriving from a variety of processing pathways including caspases, cathepsins, MMPs, ADAMs, kallikreins, calpains, and granzymes, among others. These self peptides can be directly loaded on circulatory dendritic cells and expand the self-antigenic repertoire available for central and peripheral tolerance.
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Affiliation(s)
- Cristina C Clement
- Department of Pathology, Albert Einstein College of Medicine , New York, NY , USA ; Department of Microbiology and Immunology, Albert Einstein College of Medicine , New York, NY , USA
| | - Laura Santambrogio
- Department of Pathology, Albert Einstein College of Medicine , New York, NY , USA ; Department of Microbiology and Immunology, Albert Einstein College of Medicine , New York, NY , USA
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40
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Fortin JS, Cloutier M, Thibodeau J. Exposing the Specific Roles of the Invariant Chain Isoforms in Shaping the MHC Class II Peptidome. Front Immunol 2013; 4:443. [PMID: 24379812 PMCID: PMC3861868 DOI: 10.3389/fimmu.2013.00443] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 11/26/2013] [Indexed: 11/26/2022] Open
Abstract
The peptide repertoire (peptidome) associated with MHC class II molecules (MHCIIs) is influenced by the polymorphic nature of the peptide binding groove but also by cell-intrinsic factors. The invariant chain (Ii) chaperones MHCIIs, affecting their folding and trafficking. Recent discoveries relating to Ii functions have provided insights as to how it edits the MHCII peptidome. In humans, the Ii gene encodes four different isoforms for which structure-function analyses have highlighted common properties but also some non-redundant roles. Another layer of complexity arises from the fact that Ii heterotrimerizes, a characteristic that has the potential to affect the maturation of associated MHCIIs in many different ways, depending on the isoform combinations. Here, we emphasize the peptide editing properties of Ii and discuss the impact of the various isoforms on the MHCII peptidome.
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Affiliation(s)
- Jean-Simon Fortin
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal , Montréal, QC , Canada
| | - Maryse Cloutier
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal , Montréal, QC , Canada
| | - Jacques Thibodeau
- Laboratoire d'Immunologie Moléculaire, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal , Montréal, QC , Canada
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Laing B, Han DY, Ferguson LR. Candidate genes involved in beneficial or adverse responses to commonly eaten brassica vegetables in a New Zealand Crohn's disease cohort. Nutrients 2013; 5:5046-64. [PMID: 24352087 PMCID: PMC3875924 DOI: 10.3390/nu5125046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 11/22/2013] [Accepted: 11/29/2013] [Indexed: 12/20/2022] Open
Abstract
Crohn’s disease (CD) is one of the two manifestations of inflammatory bowel disease. Particular foods are thought with CD to exacerbate their illness. Vegetables, especially Brassicaceae, are often shunned by people with CD because of the negative effects they are alleged to have on their symptoms. Brassicaceae supply key nutrients which are necessary to meet recommended daily intakes. We sought to identify the candidate genes involved in the beneficial or adverse effects of Brassicaceae most commonly eaten, as reported by the New Zealand adults from the “Genes and Diet in Inflammatory Bowel disease Study” based in Auckland. An analysis of associations between the single nucleotide polymorphisms (SNPs) and the beneficial or adverse effects of the ten most commonly eaten Brassicaceae was carried out. A total of 37 SNPs were significantly associated with beneficial effects (p = 0.00097 to 0.0497) and 64 SNPs were identified with adverse effects (p = 0.0000751 to 0.049). After correcting for multiple testing, rs7515322 (DIO1) and rs9469220 (HLA) remained significant. Our findings show that the tolerance of some varieties of Brassicaceae may be shown by analysis of a person’s genotype.
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Affiliation(s)
- Bobbi Laing
- Discipline of Nutrition, School of Medical Sciences, Auckland University, 85 Park Road, Grafton Campus, Auckland 1142, New Zealand.
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De Riva A, Busch R. MHC Class II Protein Turnover In vivo and Its Relevance for Autoimmunity in Non-Obese Diabetic Mice. Front Immunol 2013; 4:399. [PMID: 24324466 PMCID: PMC3839011 DOI: 10.3389/fimmu.2013.00399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 11/08/2013] [Indexed: 11/19/2022] Open
Abstract
Major histocompatibility complex class II (MHCII) proteins are loaded with endosomal peptides and reside at the surface of antigen-presenting cells (APCs) for a time before being degraded. In vitro, MHCII protein levels and turnover are affected by peptide loading and by rates of ubiquitin-dependent internalization from the cell surface, which is in turn affected by APC type and activation state. Prior work suggested that fast turnover of disease-associated MHCII alleles may contribute to autoimmunity. We recently developed novel stable isotope tracer techniques to test this hypothesis in vivo. In non-obese diabetic (NOD) mice, a model of type 1 diabetes (T1D), MHCII turnover was affected by APC type, but unaffected by disease-associated structural polymorphism. Differences in MHCII turnover were observed between NOD colonies with high and low T1D incidence, but fast turnover was dispensable for autoimmunity. Moreover, NOD mice with gene knockouts of peptide loading cofactors do not develop T1D. Thus, fast turnover does not appear pathogenic, and conventional antigen presentation is critical for autoimmunity in NOD mice. However, shared environmental factors may underpin colony differences in MHCII protein turnover, immune regulation, and pathogenesis.
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Affiliation(s)
| | - Robert Busch
- Department of Medicine, University of Cambridge, Cambridge, UK
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Internalizing MHC class II-peptide complexes are ubiquitinated in early endosomes and targeted for lysosomal degradation. Proc Natl Acad Sci U S A 2013; 110:20188-93. [PMID: 24277838 DOI: 10.1073/pnas.1312994110] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
As sentinels of the immune system, dendritic cells (DCs) continuously generate and turnover antigenic peptide-MHC class II complexes (pMHC-II). pMHC-II generation is a complex process that involves many well-characterized MHC-II biosynthetic intermediates; however, the mechanisms leading to MHC-II turnover/degradation are poorly understood. We now show that pMHC-II complexes undergoing clathrin-independent endocytosis from the DC surface are efficiently ubiquitinated by the E3 ubiquitin ligase March-I in early endosomes, whereas biosynthetically immature MHC-II-Invariant chain (Ii) complexes are not. The inability of MHC-II-Ii to serve as a March-I substrate is a consequence of Ii sorting motifs that divert the MHC-II-Ii complex away from March-I(+) early endosomes. When these sorting motifs are mutated, or when clathrin-mediated endocytosis is inhibited, MHC-II-Ii complexes internalize by using a clathrin-independent endocytosis pathway and are now ubiquitinated as efficiently as pMHC-II complexes. These data show that the selective ubiquitination of internalizing surface pMHC-II in March-I(+) early endosomes promotes degradation of "old" pMHC-II and spares forms of MHC-II that have not yet loaded antigenic peptides or have not yet reached the DC surface.
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Sant AJ, Chaves FA, Leddon SA, Tung J. The control of the specificity of CD4 T cell responses: thresholds, breakpoints, and ceilings. Front Immunol 2013; 4:340. [PMID: 24167504 PMCID: PMC3805957 DOI: 10.3389/fimmu.2013.00340] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 10/04/2013] [Indexed: 12/31/2022] Open
Abstract
It has been known for over 25 years that CD4 T cell responses are restricted to a finite number of peptide epitopes within pathogens or protein vaccines. These selected peptide epitopes are termed "immunodominant." Other peptides within the antigen that can bind to host MHC molecules and recruit CD4 T cells as single peptides are termed "cryptic" because they fail to induce responses when expressed in complex proteins or when in competition with other peptides during the immune response. In the last decade, our laboratory has evaluated the mechanisms that underlie the preferential specificity of CD4 T cells and have discovered that both intracellular events within antigen presenting cells, particular selective DM editing, and intercellular regulatory pathways, involving IFN-γ, indoleamine 2,3-dioxygenase, and regulatory T cells, play a role in selecting the final peptide specificity of CD4 T cells. In this review, we summarize our findings, discuss the implications of this work on responses to pathogens and vaccines and speculate on the logic of these regulatory events.
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Affiliation(s)
- Andrea J. Sant
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, USA
| | - Francisco A. Chaves
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, USA
| | - Scott A. Leddon
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, USA
| | - Jacqueline Tung
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, USA
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45
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Bosch B, Berger AC, Khandelwal S, Heipertz EL, Scharf B, Santambrogio L, Roche PA. Disruption of multivesicular body vesicles does not affect major histocompatibility complex (MHC) class II-peptide complex formation and antigen presentation by dendritic cells. J Biol Chem 2013; 288:24286-92. [PMID: 23846690 DOI: 10.1074/jbc.m113.461996] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The antigen processing compartments in antigen-presenting cells (APCs) have well known characteristics of multivesicular bodies (MVBs). However, the importance of MVB integrity to APC function remains unknown. In this study, we have altered the ultrastructure of the MVB by perturbing cholesterol content genetically through the use of a deletion of the lipid transporter Niemann-Pick type C1 (NPC1). Immunofluorescence and electron microscopic analyses reveal that the antigen processing compartments in NPC1(-/-) dendritic cells (DCs) have an abnormal ultrastructure in that the organelles are enlarged and the intraluminal vesicles are almost completely absent and those remaining are completely disorganized. MHC-II is restricted to the limiting membrane of these enlarged MVBs where it colocalizes with the peptide editor H2-DM. Curiously, proteolytic removal of the chaperone protein Invariant chain from MHC-II, degradation of internalized foreign antigens, and antigenic-peptide binding to nascent MHC-II are normal in NPC1(-/-) DCs. Antigen-pulsed NPC1(-/-) DCs are able to effectively activate antigen-specific CD4 T cells in vitro, and immunization of NPC1(-/-) mice reveals surprisingly normal CD4 T cell activation in vivo. Our data thus reveal that the localization of MHC-II on the intraluminal vesicles of multivesicular antigen processing compartments is not required for efficient antigen presentation by DCs.
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Affiliation(s)
- Berta Bosch
- Experimental Immunology Branch, NCI, National Institutes of Health, Bethesda, Maryland 20892, USA
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Pos W, Sethi DK, Wucherpfennig KW. Mechanisms of peptide repertoire selection by HLA-DM. Trends Immunol 2013; 34:495-501. [PMID: 23835076 DOI: 10.1016/j.it.2013.06.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 05/17/2013] [Accepted: 06/05/2013] [Indexed: 10/26/2022]
Abstract
Recently, crystal structures of key complexes in antigen presentation have been reported. HLA-DM functions in antigen presentation by catalyzing dissociation of an invariant chain remnant from the peptide binding groove and stabilizing empty MHC class II proteins in a peptide-receptive conformation. The crystal structure of a MHC class II-HLA-DM complex explains how HLA-DM stabilizes an otherwise short-lived transition state and promotes a rapid peptide exchange process that favors the highest-affinity ligands. HLA-DO has sequence similarity with MHC class II molecules yet inhibits antigen presentation. The structure of the HLA-DO-HLA-DM complex shows that it blocks HLA-DM activity as a substrate mimic. Alterations in the efficiency of DM-mediated peptide selection may contribute to autoimmune pathologies, which will be an exciting area for future investigation.
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Affiliation(s)
- Wouter Pos
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA
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Ferrante A. For many but not for all: how the conformational flexibility of the peptide/MHCII complex shapes epitope selection. Immunol Res 2013; 56:85-95. [PMID: 22753017 PMCID: PMC4197051 DOI: 10.1007/s12026-012-8342-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The adaptive immune response starts when CD4+ T cells recognize peptide antigens presented by class II molecules of the Major Histocompatibility Complex (MHCII). Two outstanding features of MHCII molecules are their polymorphism and the ability of each allele to bind a large panoply of peptides. The ability of each MHCII molecule to interact with a limited, though broad, range of amino acid sequences, or "permissive specificity" of binding, is the result of structural flexibility. This flexibility has been identified through biochemical and biophysical studies, and molecular dynamic simulations have modeled the conformational rearrangements that the peptide and the MHCII undergo during interaction. Moreover, there is evidence that the structural flexibility of the peptide/MHCII complex correlates with the activity of the "peptide-editing" molecule DM. In light of the impact that these recent findings have on our ability to predict MHCII epitopes, a review of the structural and thermodynamic determinants of peptide binding to MHCII is proposed.
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Affiliation(s)
- Andrea Ferrante
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775-7000, USA.
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Li XH, Chen JX, Yue GX, Liu YY, Zhao X, Guo XL, Liu Q, Jiang YM, Bai MH. Gene expression profile of the hippocampus of rats subjected to chronic immobilization stress. PLoS One 2013; 8:e57621. [PMID: 23544040 PMCID: PMC3609811 DOI: 10.1371/journal.pone.0057621] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 01/24/2013] [Indexed: 02/07/2023] Open
Abstract
Objective This study systematically investigated the effect of chronic stress on the hippocampus and its damage mechanism at the whole genome level. Methods The rat whole genome expression chips (Illumina) were used to detect gene expression differences in the hippocampus of rats subjected to chronic immobilization stress (daily immobilization stress for 3 h, for 7 or 21 days). The hippocampus gene expression profile was studied through gene ontology and signal pathway analyses using bioinformatics. A differentially expressed transcription regulation network was also established. Real-time quantitative polymerase chain reaction (RT-PCR) was used to verify the microarray results and determine expression of the Gabra1, Fadd, Crhr2, and Cdk6 genes in the hippocampal tissues. Results Compared to the control group, 602 differentially expressed genes were detected in the hippocampus of rats subjected to stress for 7 days, while 566 differentially expressed genes were expressed in the animals experiencing stress for 21 days. The stress significantly inhibited the primary immune system functions of the hippocampus in animals subjected to stress for both 7 and 21 days. Immobilization activated the extracellular matrix receptor interaction pathway after 7 day exposure to stress and the cytokine-cytokine receptor interaction pathway. The enhanced collagen synthesis capacity of the hippocampal tissue was the core molecular event of the stress regulation network in the 7-day group, while the inhibition of hippocampal cell growth was the core molecular event in the 21-day group. For the Gabra1, Fadd, Crhr2, and Cdk6 genes, RT-PCR results were nearly in line with gene chip assay results. Conclusion During the 7-day and 21-day stress processes, the combined action of polygenic, multilevel, and multi-signal pathways leads to the disorder of the immunologic functions of the hippocampus, hippocampal apoptosis, and proliferation disequilibrium.
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Affiliation(s)
- Xiao-Hong Li
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
- School of Pre-clinical Medicine, Guangxi University of Chinese Medicine, Nanning, China
| | - Jia-Xu Chen
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
- * E-mail:
| | - Guang-Xin Yue
- Institute of Basic Theory of TCM, China Academy of Chinese Medical Science, Beijing, China
| | - Yue-Yun Liu
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Xin Zhao
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Xiao-Ling Guo
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Qun Liu
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - You-Ming Jiang
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Ming-Hua Bai
- School of Pre-clinical Medicine, Beijing University of Chinese Medicine, Beijing, China
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Petersdorf EW, Malkki M, Horowitz MM, Spellman SR, Haagenson MD, Wang T. Mapping MHC haplotype effects in unrelated donor hematopoietic cell transplantation. Blood 2013; 121:1896-905. [PMID: 23305741 PMCID: PMC3591807 DOI: 10.1182/blood-2012-11-465161] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Accepted: 12/21/2012] [Indexed: 01/09/2023] Open
Abstract
Life-threatening risks associated with HLA-mismatched unrelated donor hematopoietic cell transplantation limit its general application for the treatment of blood diseases. The increased risks might be explained by undetected genetic variation within the highly polymorphic major histocompatibility complex (MHC) region. We retrospectively assessed each of 1108 MHC region single nucleotide polymorphisms (SNPs) in 2628 patients and their HLA-mismatched unrelated donors to determine whether SNPs are associated with the risk of mortality, disease-free survival, transplant-related mortality, relapse, and acute and chronic graft-versus-host disease (GVHD). Multivariate analysis adjusted for HLA mismatching and nongenetic variables associated with each clinical end point. Twelve SNPs were identified as transplantation determinants. SNP-associated risks were conferred by either patient or donor SNP genotype or by patient-donor SNP mismatching. Risks after transplantation increased with increasing numbers of unfavorable SNPs. SNPs that influenced acute GVHD were independent of those that affected risk of chronic GVHD and relapse. HLA haplotypes differed with respect to haplotype content of (un)favorable SNPs. Outcome after HLA-mismatched unrelated donor transplantation is influenced by MHC region variation that is undetected with conventional HLA typing. Knowledge of the SNP content of HLA haplotypes provides a means to estimate risks prior to transplantation and to lower complications through judicious selection of donors with favorable MHC genetics.
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Affiliation(s)
- Effie W Petersdorf
- Division of Clinical Research, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
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50
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Hoze E, Tsaban L, Maman Y, Louzoun Y. Predictor for the effect of amino acid composition on CD4+ T cell epitopes preprocessing. J Immunol Methods 2013; 391:163-73. [PMID: 23481624 DOI: 10.1016/j.jim.2013.02.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Revised: 02/17/2013] [Accepted: 02/17/2013] [Indexed: 11/28/2022]
Abstract
Predictive tools for all levels of CD8+ T cell epitopes processing have reached a maturation level. Good prediction algorithms have been developed for proteasomal cleavage, TAP and MHC class I peptide binding. The same cannot be said of CD4+ T cell epitopes. While multiple algorithms of varying accuracy have been proposed for MHC class II peptide binding, the preprocessing of CD4+ T cell epitopes is still lacking a good prediction algorithm. CD4+ T cell epitopes generation includes several stages, not all which are well-defined. We here group these stages to produce a generic preprocessing stage predictor for the cleavage processes preceding the presentation of epitopes to CD4+ T cell. The predictor is learnt using a combination of in vitro cleavage experiments and observed naturally processed MHC class II binding peptides. The properties of the predictor highlight the effect of different factors on CD4+ T cell epitopes preprocessing. The most important factor emerging from the predictor is the secondary structure of the cleaved region in the protein. The effect of the secondary structure is expected since CD4+ T cell epitopes are not denatured before cleavage. A website developed based on this predictor is available at: http://peptibase.cs.biu.ac.il/PepCleave_cd4/.
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Affiliation(s)
- Ehud Hoze
- Department of Mathematics, Bar Ilan University, Ramat Gan 52900, Israel
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