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Elbert M, Neumann F, Kiefer M, Christofyllakis K, Balensiefer B, Kos I, Carbon G, Kaddu-Mulindwa D, Bittenbring JT, Fadle N, Regitz E, Fend F, Bonzheim I, Thurner L, Bewarder M. Hyper-N-glycosylated SEL1L3 as auto-antigenic B-cell receptor target of primary vitreoretinal lymphomas. Sci Rep 2024; 14:9571. [PMID: 38671086 PMCID: PMC11053041 DOI: 10.1038/s41598-024-60169-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
Primary vitreoretinal lymphoma (PVRL) is a rare subtype of DLBCL and can progress into primary central nervous system lymphoma (PCNSL). To investigate the role of chronic antigenic stimulation in PVRL, we cloned and expressed B-cell receptors (BCR) from PVRL patients and tested for binding against human auto-antigens. SEL1L3, a protein with multiple glycosylation sites, was identified as the BCR target in 3/20 PVRL cases. SEL1L3 induces proliferation and BCR pathway activation in aggressive lymphoma cell lines. Moreover, SEL1L3 conjugated to a toxin killed exclusively lymphoma cells with respective BCR-reactivity. Western Blot analysis indicates the occurrence of hyper-N-glycosylation of SEL1L3 at aa 527 in PVRL patients with SEL1L3-reactive BCRs. The BCR of a PVRL patient with serum antibodies against SEL1L3 was cloned from a vitreous body biopsy at diagnosis and of a systemic manifestation at relapse. VH4-04*07 was used in both lymphoma manifestations with highly conserved CDR3 regions. Both BCRs showed binding to SEL1L3, suggesting continued dependence of lymphoma cells on antigen stimulation. These results indicate an important role of antigenic stimulation by post-translationally modified auto-antigens in the genesis of PVRL. They also provide the basis for a new treatment approach targeting unique lymphoma BCRs with ultimate specificity.
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MESH Headings
- Humans
- Receptors, Antigen, B-Cell/metabolism
- Glycosylation
- Cell Line, Tumor
- Retinal Neoplasms/genetics
- Retinal Neoplasms/metabolism
- Retinal Neoplasms/pathology
- Retinal Neoplasms/immunology
- Autoantigens/immunology
- Autoantigens/metabolism
- Lymphoma, Large B-Cell, Diffuse/genetics
- Lymphoma, Large B-Cell, Diffuse/immunology
- Lymphoma, Large B-Cell, Diffuse/pathology
- Lymphoma, Large B-Cell, Diffuse/metabolism
- Female
- Male
- Vitreous Body/metabolism
- Vitreous Body/pathology
- Middle Aged
- Aged
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Affiliation(s)
- Michelle Elbert
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Frank Neumann
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Maximilian Kiefer
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | | | | | - Igor Kos
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Gabi Carbon
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | | | | | - Natalie Fadle
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Evi Regitz
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Falko Fend
- Institute of Pathology and Neuropathology and Comprehensive Cancer Center Tuebingen, Eberhard-Karls-University, Tuebingen, Germany
| | - Irina Bonzheim
- Institute of Pathology and Neuropathology and Comprehensive Cancer Center Tuebingen, Eberhard-Karls-University, Tuebingen, Germany
| | - Lorenz Thurner
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany
| | - Moritz Bewarder
- Internal Medicine I, Saarland University Medical Center, Homburg, Germany.
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Lee SY, Ko DH, Son MJ, Kim JA, Jung K, Kim YS. Affinity Maturation of a T-Cell Receptor-Like Antibody Specific for a Cytomegalovirus pp65-Derived Peptide Presented by HLA-A*02:01. Int J Mol Sci 2021; 22:ijms22052349. [PMID: 33652936 PMCID: PMC7956451 DOI: 10.3390/ijms22052349] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 12/14/2022] Open
Abstract
Human cytomegalovirus (CMV) infection is widespread among adults (60–90%) and is usually undetected in healthy individuals without symptoms but can cause severe diseases in immunocompromised hosts. T-cell receptor (TCR)-like antibodies (Abs), which recognize complex antigens (peptide–MHC complex, pMHC) composed of MHC molecules with embedded short peptides derived from intracellular proteins, including pathogenic viral proteins, can serve as diagnostic and/or therapeutic agents. In this study, we aimed to engineer a TCR-like Ab specific for pMHC comprising a CMV pp65 protein-derived peptide (495NLVPMVATV503; hereafter, CMVpp65495-503) in complex with MHC-I molecule human leukocyte antigen (HLA)-A*02:01 (CMVpp65495-503/HLA-A*02:01) to increase affinity by sequential mutagenesis of complementarity-determining regions using yeast surface display technology. Compared with the parental Ab, the final generated Ab (C1-17) showed ~67-fold enhanced binding affinity (KD ≈ 5.2 nM) for the soluble pMHC, thereby detecting the cell surface-displayed CMVpp65495-503/HLA-A*02:01 complex with high sensitivity and exquisite specificity. Thus, the new high-affinity TCR-like Ab may be used for the detection and treatment of CMV infection.
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Affiliation(s)
- Se-Young Lee
- Department of Molecular Science and Technology, Ajou University, Suwon 16499, Korea; (S.-Y.L.); (D.-H.K.); (M.-J.S.); (J.-A.K.)
| | - Deok-Han Ko
- Department of Molecular Science and Technology, Ajou University, Suwon 16499, Korea; (S.-Y.L.); (D.-H.K.); (M.-J.S.); (J.-A.K.)
| | - Min-Jeong Son
- Department of Molecular Science and Technology, Ajou University, Suwon 16499, Korea; (S.-Y.L.); (D.-H.K.); (M.-J.S.); (J.-A.K.)
| | - Jeong-Ah Kim
- Department of Molecular Science and Technology, Ajou University, Suwon 16499, Korea; (S.-Y.L.); (D.-H.K.); (M.-J.S.); (J.-A.K.)
| | - Keunok Jung
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon 16499, Korea;
| | - Yong-Sung Kim
- Department of Molecular Science and Technology, Ajou University, Suwon 16499, Korea; (S.-Y.L.); (D.-H.K.); (M.-J.S.); (J.-A.K.)
- Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon 16499, Korea;
- Correspondence: ; Tel.: +82-31-219-2662; Fax: +82-31-219-1610
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T-cell receptor repertoire of cytomegalovirus-specific cytotoxic T-cells after allogeneic stem cell transplantation. Sci Rep 2020; 10:22218. [PMID: 33335252 PMCID: PMC7747720 DOI: 10.1038/s41598-020-79363-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 12/08/2020] [Indexed: 02/07/2023] Open
Abstract
Cytomegalovirus (CMV) infection is a major complication during allogeneic stem cell transplantation (allo-SCT). However, mechanisms of adaptive immunity that drive this remain unclear. To define early immunological responses to CMV after transplantation, we using next-generation sequencing to examine the repertoire of T-cell receptors in CD8+/CMV pp65 tetramer+ cells (CMV-CTLs) in peripheral blood samples obtained from 16 allo-SCT recipients with HLA-A*24:02 at the time of CMV reactivation. In most patients, TCR beta repertoire of CMV-CTLs was highly skewed (median Inverse Simpson's index: 1.595) and, 15 of 16 patients shared at least one TCR-beta clonotype with ≥ 2 patients. The shared TCRs were dominant in 12 patients and, two clonotypes were shared by about half of the patients. Similarity analysis showed that CDR3 sequences of shared TCRs were more similar than unshared TCRs. TCR beta repertoires of CMV-CTLs in 12 patients were also analyzed after 2-4 weeks to characterize the short-term dynamics of TCR repertoires. In ten patients, we observed persistence of prevailing clones. In the other two patients, TCR repertoires became more diverse, major clones declined, and new private clones subsequently emerged. These results provided the substantive clue to understand the immunological behavior against CMV reactivation after allo-SCT.
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