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Elsayed A, von Hardenberg S, Atschekzei F, Graalmann T, Jänke C, Witte T, Ringshausen FC, Sogkas G. Phenotypic and pathomechanistic overlap between tapasin and TAP deficiencies. J Allergy Clin Immunol 2024; 154:1069-1075. [PMID: 38866210 DOI: 10.1016/j.jaci.2024.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/17/2024] [Accepted: 06/03/2024] [Indexed: 06/14/2024]
Abstract
BACKGROUND Human tapasin deficiency is reported to cause an autosomal-recessive inborn error of immunity characterized by substantially reduced cell surface expression of major histocompatibility complex class I (MHC-I). OBJECTIVE We evaluated the immunologic and clinical consequences of tapasin deficiency. METHODS A novel homozygous variant in TAPBP was identified by means of whole genome sequencing. The expression of tapasin and both subunits of the transporter associated with antigen presentation (TAP) were evaluated by Western blot analysis. Cell surface and intracellular expression of MHC-I were evaluated by flow cytometry. Small interfering RNAs were used for silencing TAPBP expression in HEK293T cells. RESULTS We identified a deletion in TAPBP (c.312del, p.(K104Nfs∗6)) causing tapasin deficiency in a patient with bronchiectasis and recurrent respiratory tract infections as well as herpes zoster. Besides substantial reduction in TAP1 and TAP2 expression, peripheral blood mononuclear cells from this patient and TAPBP-knockdown HEK293T cells, displayed reduced cell surface expression of MHC-I, while reduction in intracellular expression of MHC-I was less prominent, suggesting a defect in MHC-I trafficking to the plasma membrane. IFN-α improved cell surface expression of MHC-I in tapasin deficient lymphocytes and TAPBP-knockdown HEK293T cells, representing a possible therapeutic approach for tapasin deficiency. CONCLUSION Tapasin deficiency is a very rare inborn error of immunity, the pathomechanism and clinical spectrum of which overlaps with TAP deficiencies.
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Affiliation(s)
- Abdulwahab Elsayed
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany; Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany
| | | | - Faranaz Atschekzei
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany; Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany
| | - Theresa Graalmann
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany; Junior Research Group for Translational Immunology, TWINCORE, Center for Infection Research and the Hannover Medical School, Hannover, Germany; Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), German Center for Lung Research (DZL), Hannover, Germany
| | - Christine Jänke
- Junior Research Group for Translational Immunology, TWINCORE, Center for Infection Research and the Hannover Medical School, Hannover, Germany
| | - Torsten Witte
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany; Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany
| | - Felix C Ringshausen
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), German Center for Lung Research (DZL), Hannover, Germany; Department of Respiratory Medicine and Infectious Diseases, Hannover Medical School, Hannover, Germany; European Reference Network on Rare and Complex Respiratory Diseases (ERN-LUNG), Frankfurt, Germany
| | - Georgios Sogkas
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany; Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany.
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Jiang J, Natarajan K, Margulies DH. Chaperone-mediated MHC-I peptide exchange in antigen presentation. IUCRJ 2024; 11:287-298. [PMID: 38656309 PMCID: PMC11067752 DOI: 10.1107/s2052252524002768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 03/26/2024] [Indexed: 04/26/2024]
Abstract
This work focuses on molecules that are encoded by the major histocompatibility complex (MHC) and that bind self-, foreign- or tumor-derived peptides and display these at the cell surface for recognition by receptors on T lymphocytes (T cell receptors, TCR) and natural killer (NK) cells. The past few decades have accumulated a vast knowledge base of the structures of MHC molecules and the complexes of MHC/TCR with specificity for many different peptides. In recent years, the structures of MHC-I molecules complexed with chaperones that assist in peptide loading have been revealed by X-ray crystallography and cryogenic electron microscopy. These structures have been further studied using mutagenesis, molecular dynamics and NMR approaches. This review summarizes the current structures and dynamic principles that govern peptide exchange as these relate to the process of antigen presentation.
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Affiliation(s)
- Jiansheng Jiang
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA
| | - Kannan Natarajan
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA
| | - David H. Margulies
- Molecular Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892, USA
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Wang M, Gu C, Yang Y, Chen L, Chen K, Du J, Wu H, Li Y. Ursolic acid derivative UAOS-Na treats experimental autoimmune encephalomyelitis by immunoregulation and protecting myelin. Front Neurol 2023; 14:1269862. [PMID: 38107649 PMCID: PMC10723162 DOI: 10.3389/fneur.2023.1269862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 11/15/2023] [Indexed: 12/19/2023] Open
Abstract
Introduction Multiple sclerosis (MS) is an inflammatory demyelinating disease of the central nervous system (CNS). Ursolic acid (UA) can be used in the MS treatment with anti-inflammatory and neuroprotective activities. However, UA is insoluble in water, which may affect its medication effectiveness. In our previous study, UAOS-Na, a water-soluble derivative of UA was obtained. In this study, we evaluated the pharmacological effects and explored its underlying mechanism of UAOS-Na on experimental autoimmune encephalomyelitis (EAE). Methods Firstly, the pharmacodynamics of UAOS-Na was investigated in EAE and Cuprizone-induced mice. And then the possible mechanisms were investigated by TMT proteomics and verified by in vitro and in vivo experiments. Results UAOS-Na (30 mg/kg/d) delayed the onset time of EAE from 11.78 days post immunization (dpi) to 14.33 dpi, reduced the incidence from 90.0% to 42.9%. UAOS-Na (60 mg/kg/d) reduced the serum levels of IFN-γ, IL-17A, TNF-α and IL-6, reduced the mononuclear cell infiltration of spinal cord, and inhibited the overexpression of key transcription factors T-bet and ROR-γt of EAE mouse spinal cord. In addition, UAOS-Na attenuated demyelination and astrogliosis in the CNS of EAE and cuprizone-induced mice. Mechanistically, proteomics showed that 96 differential expression proteins (DEPs) were enriched and 94 were upregulated in EAE mice compared with normal group. After UAOS-Na treatment, 16 DEPs were enriched and 15 were downregulated, and these DEPs were markedly enriched in antigen processing and presentation (APP) signaling pathway. Moreover, UAOS-Na downregulated the protein levels of Tapbp and H2-T23 in MHC-I antigen presentation pathway and reduced the proliferation of splenic CD8 T cells, thereby inhibiting the CNS infiltration of CD8 T cells. Conclusion Our findings demonstrated that UAOS-Na has both myelin protective and anti-inflammatory effects. And it could reduce the inflammation of MS by downregulating the expression of Tapbp and H2-T23 in the MHC-I antigen presentation pathway.
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Affiliation(s)
- Maolin Wang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Department of Pharmacy, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Chenming Gu
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yifu Yang
- Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Liang Chen
- Nutrition Science, Amway (Shanghai) Innovation and Science Co., Ltd., Shanghai, China
| | - Kaixian Chen
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jun Du
- Nutrition Science, Amway (Shanghai) Innovation and Science Co., Ltd., Shanghai, China
| | - Huali Wu
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yiming Li
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai, China
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Abualrous ET, Stolzenberg S, Sticht J, Wieczorek M, Roske Y, Günther M, Dähn S, Boesen BB, Calvo MM, Biese C, Kuppler F, Medina-García Á, Álvaro-Benito M, Höfer T, Noé F, Freund C. MHC-II dynamics are maintained in HLA-DR allotypes to ensure catalyzed peptide exchange. Nat Chem Biol 2023; 19:1196-1204. [PMID: 37142807 PMCID: PMC10522485 DOI: 10.1038/s41589-023-01316-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 03/17/2023] [Indexed: 05/06/2023]
Abstract
Presentation of antigenic peptides by major histocompatibility complex class II (MHC-II) proteins determines T helper cell reactivity. The MHC-II genetic locus displays a large degree of allelic polymorphism influencing the peptide repertoire presented by the resulting MHC-II protein allotypes. During antigen processing, the human leukocyte antigen (HLA) molecule HLA-DM (DM) encounters these distinct allotypes and catalyzes exchange of the placeholder peptide CLIP by exploiting dynamic features of MHC-II. Here, we investigate 12 highly abundant CLIP-bound HLA-DRB1 allotypes and correlate dynamics to catalysis by DM. Despite large differences in thermodynamic stability, peptide exchange rates fall into a target range that maintains DM responsiveness. A DM-susceptible conformation is conserved in MHC-II molecules, and allosteric coupling between polymorphic sites affects dynamic states that influence DM catalysis. As exemplified for rheumatoid arthritis, we postulate that intrinsic dynamic features of peptide-MHC-II complexes contribute to the association of individual MHC-II allotypes with autoimmune disease.
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Affiliation(s)
- Esam T Abualrous
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
- Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin, Germany
- Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Sebastian Stolzenberg
- Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin, Germany
| | - Jana Sticht
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
- Core Facility BioSupraMol, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Marek Wieczorek
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Yvette Roske
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Matthias Günther
- Theoretische Systembiologie (B086), Deutsches Krebsforschungszentrum, Heidelberg, Germany
| | - Steffen Dähn
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Benedikt B Boesen
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Marcos Martínez Calvo
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Charlotte Biese
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Frank Kuppler
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Álvaro Medina-García
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Miguel Álvaro-Benito
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Thomas Höfer
- Theoretische Systembiologie (B086), Deutsches Krebsforschungszentrum, Heidelberg, Germany
| | - Frank Noé
- Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin, Germany.
- Microsoft Research AI4Science, Berlin, Germany.
- Department of Physics, Freie Universität Berlin, Berlin, Germany.
- Department of Chemistry, Rice University, Houston, TX, USA.
| | - Christian Freund
- Protein Biochemistry, Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany.
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