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Doxiadis I, Lehmann C. External proficiency testing exercises: challenges and opportunities. Front Genet 2024; 15:1304312. [PMID: 38404667 PMCID: PMC10884168 DOI: 10.3389/fgene.2024.1304312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 01/31/2024] [Indexed: 02/27/2024] Open
Affiliation(s)
- Ilias Doxiadis
- Institute for Transfusion Medicine, University Hospital of Leipzig, Leipzig, Germany
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2
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Wichmann G, Vetter N, Lehmann C, Landgraf R, Doxiadis I, Großmann R, Vorobeva E, Dietz A, Zebralla V, Wiegand S, Wald T. Outcome differences in HPV-driven head and neck squamous cell carcinoma attributable to altered human leukocyte antigen frequencies. Front Oncol 2023; 13:1212454. [PMID: 38192630 PMCID: PMC10772155 DOI: 10.3389/fonc.2023.1212454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 11/30/2023] [Indexed: 01/10/2024] Open
Abstract
Background Effective immune surveillance requires a functioning immune system and natural killer (NK) and T cells for adequate innate and antigen-specific immune responses critically depending on human leukocyte antigens (HLAs) and haplotypes representing advantageous combinations of HLA antigens. Recently, we reported a link between altered frequencies of HLA alleles and haplotypes and developing head and neck squamous cell carcinoma (HNSCC). Whereas the majority of HNSCCs seem to be related to classical risk factors alcohol and tobacco, a subset of HNSCC and especially oropharyngeal squamous cell carcinoma (OPSCC) were etiologically linked to human papillomavirus (HPV) recently. Here, we demonstrate in HPV-driven (p16-positive high risk-HPV DNA-positive) HNSCC a deviating distribution of HLA antigens and haplotypes and their relevance to outcome. Methods Leukocyte DNA of n = 94 HPV-driven HNSCC patients (n = 57 OPSCC, n = 37 outside oropharynx) underwent HLA SSO typing, allowing allele, antigen (allele group), and haplo-typing. Besides comparing these frequencies with those of German blood donors, we analyzed their impact on outcome using Kaplan-Meier plots and Cox proportional hazard regression. Results Antigen and haplotype frequencies demonstrate enrichment of rare antigens and haplotypes. The HLA score for unselected HNSCC patients was not predictive for outcome here. However, together with alcohol consumption, tobacco smoking, T category, and extranodal extension of locoregional metastases and treatment applied, eight HLA traits allow for predicting progression-free and tumor-specific survival. Conclusion Patients can be categorized into low, intermediate-low, intermediate-high, and high risk groups. Using a new PFS risk score for HPV-driven HNSCC may allow to improve prognostication.
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Affiliation(s)
- Gunnar Wichmann
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Nathalie Vetter
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Claudia Lehmann
- Institute for Transfusion Medicine, Transplantation Immunology, University Hospital Leipzig, Leipzig, Germany
| | - Ramona Landgraf
- Institute for Transfusion Medicine, Transplantation Immunology, University Hospital Leipzig, Leipzig, Germany
| | - Ilias Doxiadis
- Institute for Transfusion Medicine, Transplantation Immunology, University Hospital Leipzig, Leipzig, Germany
| | - Rebecca Großmann
- Institute for Transfusion Medicine, Transplantation Immunology, University Hospital Leipzig, Leipzig, Germany
| | - Ekaterina Vorobeva
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Andreas Dietz
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Veit Zebralla
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Susanne Wiegand
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
| | - Theresa Wald
- Department of Otorhinolaryngology, Head and Neck surgery, University Hospital Leipzig, Leipzig, Germany
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Saal M, Loeffler-Wirth H, Gruenewald T, Doxiadis I, Lehmann C. Genetic Predisposition to SARS-CoV-2 Infection: Cytokine Polymorphism and Disease Transmission within Households. Biology (Basel) 2023; 12:1385. [PMID: 37997984 PMCID: PMC10669642 DOI: 10.3390/biology12111385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/25/2023] [Accepted: 10/27/2023] [Indexed: 11/25/2023]
Abstract
We addressed the question of the influence of the molecular polymorphism of cytokines from different T helper subsets on the susceptibility to SARS-CoV-2 infection. From a cohort of 527 samples (collected from 26 May 2020 to 31 March 2022), we focused on individuals living in the same household (n = 58) with the SARS-CoV-2-infected person. We divided them into households with all individuals SARS-CoV-2 PCR positive (n = 29, households, 61 individuals), households with mixed PCR pattern (n = 24, 62) and negative households (n = 5, 15), respectively. TGF-β1 and IL-6 were the only cytokines tested with a significant difference between the cohorts. We observed a shift toward Th2 and the regulatory Th17 and Treg subset regulation for households with all members infected compared to those without infection. These data indicate that the genetically determined balance between the cytokines acting on different T helper cell subsets may play a pivotal role in transmission of and susceptibility to SARS-CoV-2 infection. Contacts infected by their index persons were more likely to highly express TGF-β1, indicating a reduced inflammatory response. Those not infected after contact had a polymorphism leading to a higher IL-6 expression. IL-6 acts in innate immunity, allergy and on the T helper cell differentiation, explaining the reduced susceptibility to SARS-CoV-2.
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Affiliation(s)
- Marius Saal
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany; (M.S.); (I.D.)
| | - Henry Loeffler-Wirth
- Interdisciplinary Centre for Bioinformatics, IZBI, Leipzig University, Haertelstr. 16–18, 04107 Leipzig, Germany;
| | - Thomas Gruenewald
- Clinic for Infectious Diseases and Tropical Medicine, Klinikum Chemnitz, Flemmingstraße 2, 09116 Chemnitz, Germany;
| | - Ilias Doxiadis
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany; (M.S.); (I.D.)
| | - Claudia Lehmann
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany; (M.S.); (I.D.)
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Rottmayer K, Loeffler-Wirth H, Gruenewald T, Doxiadis I, Lehmann C. Individual Immune Response to SARS-CoV-2 Infection-The Role of Seasonal Coronaviruses and Human Leukocyte Antigen. Biology (Basel) 2023; 12:1293. [PMID: 37887003 PMCID: PMC10603889 DOI: 10.3390/biology12101293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 09/24/2023] [Accepted: 09/25/2023] [Indexed: 10/28/2023]
Abstract
During the coronavirus pandemic, evidence is growing that the severity, susceptibility and host immune response to SARS-CoV-2 infection can be highly variable. Several influencing factors have been discussed. Here, we investigated the humoral immune response against SARS-CoV-2 spike, S1, S2, the RBD, nucleocapsid moieties and S1 of seasonal coronaviruses: hCoV-229E, hCoV-HKU1, hCoV-NL63 and hCoV-OC43, as well as MERS-CoV and SARS-CoV, in a cohort of 512 individuals. A bead-based multiplex assay allowed simultaneous testing for all the above antigens and the identification of different antibody patterns. Then, we correlated these patterns with 11 HLA loci. Regarding the seasonal coronaviruses, we found a moderate negative correlation between antibody levels against hCoV-229E, hCoV-HKU1 and hCoV-NL63 and the SARS-CoV-2 antigens. This could be an indication of the original immunological imprinting. High and low antibody response patterns were distinguishable, demonstrating the individuality of the humoral response towards the virus. An immunogenetical factor associated with a high antibody response (formation of ≥4 different antibodies) was the presence of HLA A*26:01, C*02:02 and DPB1*04:01 alleles, whereas the HLA alleles DRB3*01:01, DPB1*03:01 and DB1*10:01 were enriched in low responders. A better understanding of this variable immune response could enable more individualized protective measures.
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Affiliation(s)
- Karla Rottmayer
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany
| | - Henry Loeffler-Wirth
- Interdisciplinary Centre for Bioinformatics, IZBI, Leipzig University, Haertelstr. 16–18, 04107 Leipzig, Germany
| | - Thomas Gruenewald
- Clinic for Infectious Diseases and Tropical Medicine, Klinikum Chemnitz, Flemmingstraße 2, 09116 Chemnitz, Germany
| | - Ilias Doxiadis
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany
| | - Claudia Lehmann
- Laboratory for Transplantation Immunology, University Hospital Leipzig, Johannisallee 32, 04103 Leipzig, Germany
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Lehmann C, Pehnke S, Weimann A, Bachmann A, Dittrich K, Petzold F, Fürst D, de Fallois J, Landgraf R, Henschler R, Lindner TH, Halbritter J, Doxiadis I, Popp B, Münch J. Extended genomic HLA typing identifies previously unrecognized mismatches in living kidney transplantation. Front Immunol 2023; 14:1094862. [PMID: 36776892 PMCID: PMC9911689 DOI: 10.3389/fimmu.2023.1094862] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 01/12/2023] [Indexed: 01/28/2023] Open
Abstract
Introduction Antibody mediated rejection (ABMR) is the most common cause of long-term allograft loss in kidney transplantation (KT). Therefore, a low human leukocyte antigen (HLA) mismatch (MM) load is favorable for KT outcomes. Hitherto, serological or low-resolution molecular HLA typing have been adapted in parallel. Here, we aimed to identify previously missed HLA mismatches and corresponding antibodies by high resolution HLA genotyping in a living-donor KT cohort. Methods 103 donor/recipient pairs transplanted at the University of Leipzig Medical Center between 1998 and 2018 were re-typed using next generation sequencing (NGS) of the HLA loci -A, -B, -C, -DRB1, -DRB345, -DQA1, -DQB1, -DPA1, and -DPB1. Based on these data, we compiled HLA MM counts for each pair and comparatively evaluated genomic HLA-typing with pre-transplant obtained serological/low-resolution HLA (=one-field) typing results. NGS HLA typing (=two-field) data was further used for reclassification of de novo HLA antibodies as "donor-specific". Results By two-field HLA re-typing, we were able to identify additional MM in 64.1% (n=66) of cases for HLA loci -A, -B, -C, -DRB1 and -DQB1 that were not observed by one-field HLA typing. In patients with biopsy proven ABMR, two-field calculated MM count was significantly higher than by one-field HLA typing. For additional typed HLA loci -DRB345, -DQA1, -DPA1, and -DPB1 we observed 2, 26, 3, and 23 MM, respectively. In total, 37.3% (69/185) of de novo donor specific antibodies (DSA) formation was directed against these loci (DRB345 ➔ n=33, DQA1 ➔ n=33, DPA1 ➔ n=1, DPB1 ➔ n=10). Conclusion Our results indicate that two-field HLA typing is feasible and provides significantly more sensitive HLA MM recognition in living-donor KT. Furthermore, accurate HLA typing plays an important role in graft management as it can improve discrimination between donor and non-donor HLA directed cellular and humoral alloreactivity in the long range. The inclusion of additional HLA loci against which antibodies can be readily detected, HLA-DRB345, -DQA1, -DQB1, -DPA1, and -DPB1, will allow a more precise virtual crossmatch and better prediction of potential DSA. Furthermore, in living KT, two-field HLA typing could contribute to the selection of the immunologically most suitable donors.
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Affiliation(s)
- Claudia Lehmann
- Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Sarah Pehnke
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Antje Weimann
- Division of Visceral Surgery and Transplantation Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Anette Bachmann
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Katalin Dittrich
- Department of Pediatric Nephrology, University of Leipzig Medical Center, Leipzig, Germany
| | - Friederike Petzold
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Daniel Fürst
- Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
| | - Jonathan de Fallois
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Ramona Landgraf
- Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Reinhard Henschler
- Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Tom H Lindner
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Jan Halbritter
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany.,Department of Nephrology and Medical Intensive Care, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Ilias Doxiadis
- Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Bernt Popp
- Institute of Human Genetics, University of Leipzig, Leipzig, Germany
| | - Johannes Münch
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany.,Department of Nephrology and Medical Intensive Care, Charité Universitätsmedizin Berlin, Berlin, Germany
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Slavcev A, Süsal C, Doxiadis I. Editorial: T-Cell and Antibody-Mediated Rejection After Organ Transplantation in the Post-COVID-19 Era – Diagnosis, Immunological Risk Evaluation and Therapy. Front Immunol 2022; 13:968668. [PMID: 35865533 PMCID: PMC9294921 DOI: 10.3389/fimmu.2022.968668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 06/24/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Antonij Slavcev
- Department of Immunogenetics, Institute for Clinical and Experimental Medicine, Prague, Czechia
- *Correspondence: Antonij Slavcev,
| | - Caner Süsal
- Transplant Immunology Research Center of Excellence, Koç University Hospital, Istanbul, Turkey
| | - Ilias Doxiadis
- Institute for Transfusion Medicine, University Hospital, Leipzig, Germany
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Vittoraki AG, Fylaktou A, Tarassi K, Tsinaris Z, Siorenta A, Petasis GC, Gerogiannis D, Lehmann C, Carmagnat M, Doxiadis I, Iniotaki AG, Theodorou I. Hidden Patterns of Anti-HLA Class I Alloreactivity Revealed Through Machine Learning. Front Immunol 2021; 12:670956. [PMID: 34386000 PMCID: PMC8353326 DOI: 10.3389/fimmu.2021.670956] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 07/12/2021] [Indexed: 11/13/2022] Open
Abstract
Detection of alloreactive anti-HLA antibodies is a frequent and mandatory test before and after organ transplantation to determine the antigenic targets of the antibodies. Nowadays, this test involves the measurement of fluorescent signals generated through antibody-antigen reactions on multi-beads flow cytometers. In this study, in a cohort of 1,066 patients from one country, anti-HLA class I responses were analyzed on a panel of 98 different antigens. Knowing that the immune system responds typically to "shared" antigenic targets, we studied the clustering patterns of antibody responses against HLA class I antigens without any a priori hypothesis, applying two unsupervised machine learning approaches. At first, the principal component analysis (PCA) projections of intra-locus specific responses showed that anti-HLA-A and anti-HLA-C were the most distantly projected responses in the population with the anti-HLA-B responses to be projected between them. When PCA was applied on the responses against antigens belonging to a single locus, some already known groupings were confirmed while several new cross-reactive patterns of alloreactivity were detected. Anti-HLA-A responses projected through PCA suggested that three cross-reactive groups accounted for about 70% of the variance observed in the population, while anti-HLA-B responses were mainly characterized by a distinction between previously described Bw4 and Bw6 cross-reactive groups followed by several yet undocumented or poorly described ones. Furthermore, anti-HLA-C responses could be explained by two major cross-reactive groups completely overlapping with previously described C1 and C2 allelic groups. A second feature-based analysis of all antigenic specificities, projected as a dendrogram, generated a robust measure of allelic antigenic distances depicting bead-array defined cross reactive groups. Finally, amino acid combinations explaining major population specific cross-reactive groups were described. The interpretation of the results was based on the current knowledge of the antigenic targets of the antibodies as they have been characterized either experimentally or computationally and appear at the HLA epitope registry.
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Affiliation(s)
- Angeliki G Vittoraki
- Immunology Department & National Tissue Typing Center, General Hospital of Athens "G. Gennimatas", Athens, Greece
| | - Asimina Fylaktou
- National Peripheral Histocompatibility Center, Immunology Department, Hippokration General Hospital, Thessaloniki, Greece
| | - Katerina Tarassi
- Immunology-Histocompatibility Department, "Evangelismos" General Hospital, Athens, Greece
| | - Zafeiris Tsinaris
- National Peripheral Histocompatibility Center, Immunology Department, Hippokration General Hospital, Thessaloniki, Greece
| | - Alexandra Siorenta
- Immunology Department & National Tissue Typing Center, General Hospital of Athens "G. Gennimatas", Athens, Greece
| | - George Ch Petasis
- National Peripheral Histocompatibility Center, Immunology Department, Hippokration General Hospital, Thessaloniki, Greece
| | - Demetris Gerogiannis
- Department of Computer Science & Engineering , University of Ioannina, Ioannina, Greece
| | - Claudia Lehmann
- Laboratory for Transplantation Immunology, Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | | | - Ilias Doxiadis
- Laboratory for Transplantation Immunology, Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Aliki G Iniotaki
- Nephrology and Transplantation Unit, Medical School of Athens, Laikon Hospital, Athens, Greece
| | - Ioannis Theodorou
- Laboratoire d'Immunologie, Hôpital St. Louis, Paris, France.,Centre d'Immunologie et des Maladies Infectieuses UPMC UMRS CR7-Inserm U1135-CNRS ERL, Paris, France
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8
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Vittoraki AG, Fylaktou A, Tarassi K, Tsinaris Z, Petasis GC, Gerogiannis D, Kheav VD, Carmagnat M, Lehmann C, Doxiadis I, Iniotaki AG, Theodorou I. Patterns of 1,748 Unique Human Alloimmune Responses Seen by Simple Machine Learning Algorithms. Front Immunol 2020; 11:1667. [PMID: 32849576 PMCID: PMC7399170 DOI: 10.3389/fimmu.2020.01667] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 06/22/2020] [Indexed: 01/15/2023] Open
Abstract
Allele specific antibody response against the polymorphic system of HLA is the allogeneic response marker determining the immunological risk for graft acceptance before and after organ transplantation and therefore routinely studied during the patient's workup. Experimentally, bead bound antigen- antibody reactions are detected using a special multicolor flow cytometer (Luminex). Routinely for each sample, antibody responses against 96 different HLA antigen groups are measured simultaneously and a 96-dimensional immune response vector is created. Under a common experimental protocol, using unsupervised clustering algorithms, we analyzed these immune intensity vectors of anti HLA class II responses from a dataset of 1,748 patients before or after renal transplantation residing in a single country. Each patient contributes only one serum sample in the analysis. A population view of linear correlations of hierarchically ordered fluorescence intensities reveals patterns in human immune responses with striking similarities with the previously described CREGs but also brings new information on the antigenic properties of class II HLA molecules. The same analysis affirms that "public" anti-DP antigenic responses are not correlated to anti DR and anti DQ responses which tend to cluster together. Principal Component Analysis (PCA) projections also demonstrate ordering patterns clearly differentiating anti DP responses from anti DR and DQ on several orthogonal planes. We conclude that a computer vision of human alloresponse by use of several dimensionality reduction algorithms rediscovers proven patterns of immune reactivity without any a priori assumption and might prove helpful for a more accurate definition of public immunogenic antigenic structures of HLA molecules. Furthermore, the use of Eigen decomposition on the Immune Response generates new hypotheses that may guide the design of more effective patient monitoring tests.
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Affiliation(s)
- Angeliki G Vittoraki
- National Tissue Typing Center & Immunology Department, General Hospital of Athens "G.Gennimatas", Athens, Greece
| | - Asimina Fylaktou
- National Peripheral Histocompatibility Center - Immunology Department, Hippokration General Hospital, Thessaloniki, Greece
| | - Katerina Tarassi
- Immunology-Histocompatibility Department, "Evangelismos" General Hospital, Athens, Greece
| | - Zafeiris Tsinaris
- Department of Computer Science and Biomedical Informatics, University of Thessaly, Lamia, Greece
| | - George Ch Petasis
- National Peripheral Histocompatibility Center - Immunology Department, Hippokration General Hospital, Thessaloniki, Greece
| | - Demetris Gerogiannis
- Department of Computer Science & Engineering, University of Ioannina, Ioannina, Greece
| | | | | | - Claudia Lehmann
- Laboratory for Transplantation Immunology, Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Ilias Doxiadis
- Laboratory for Transplantation Immunology, Institute for Transfusion Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Aliki G Iniotaki
- Nephrology and Transplantation Unit, Medical School of Athens, Laikon Hospital, Athens, Greece
| | - Ioannis Theodorou
- Laboratoire d'Immunologie, Hôpital St. Louis, Paris, France.,Centre d'Immunologie et des Maladies Infectieuses UPMC UMRS CR7 - Inserm U1135 - CNRS ERL 8255, Paris, France
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Pehnke S, Lindner TH, Popp B, Doxiadis I, Landgraf R, Lehmann C, Halbritter J, Münch J. P1776HLA TYPING BY NGS ENHANCES MISMATCH DETECTION IN LIVING KIDNEY TRANSPLANTATION. Nephrol Dial Transplant 2020. [DOI: 10.1093/ndt/gfaa142.p1776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background and Aims
Antibody mediated rejection (ABMR) due to the development of donor specific HLA antibodies is the most common cause for graft loss in kidney transplant recipients. Therefore, a low count of HLA mismatches is favorable in the course of transplantation. Hitherto, several techniques for HLA typing have been adapted in parallel, e.g. serological or low-resolution PCR. In this single-center study, we aimed to perform “HLA re-typing” by next generation sequencing (NGS) in a living kidney transplant cohort (n=143), in order to identify HLA mismatches in donor/recipient pairs, that were missed by previous HLA typing methods.
Method
We isolated DNA of 102 donor/recipient pairs, that received a living kidney transplantation at the University Hospital Leipzig (Germany) between 1998 and 2018, and performed long range PCR of all known HLA loci. Using these NGS results, we compiled a genomic HLA mismatch formula. We evaluated, if genomic HLA typing identifies more HLA mismatches compared to the results of previous HLA typing methods, that were recorded in the Eurotransplant database for our donor/recipient pairs.
Results
By genomic HLA typing, we were able to identify HLA mismatches in 10.2 % of donor/recipient pairs, that have been missed by previous methods. In our cohort, we recognized most mismatches in the DRB1 locus, that were missed with other HLA typing techniques.
Conclusion
Our results suggest, that genomic HLA typing can be more precise in detecting HLA mismatches in donor recipient/pairs. Especially in the course of living kidney transplantation, a higher accuracy in HLA typing might enhance donor selection. Furthermore, accurate HLA typing can influence graft management in the course of ABMR, as it may improve the detection of donor specific HLA directed antibodies.
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Affiliation(s)
- Sarah Pehnke
- University Hospital Leipzig, Division of Nephrology, Department of Internal Medicine, Leipzig, Germany
| | - Tom H Lindner
- University Hospital Leipzig, Division of Nephrology, Department of Internal Medicine, Leipzig, Germany
| | - Bernt Popp
- University Hospital Leipzig, Institute of Human Genetics, Leipzig, Germany
| | - Ilias Doxiadis
- University Hospital Leipzig, Institute for Transfusion Medicine, Leipzig, Germany
| | - Ramona Landgraf
- University Hospital Leipzig, Institute for Transfusion Medicine, Leipzig, Germany
| | - Claudia Lehmann
- University Hospital Leipzig, Institute for Transfusion Medicine, Leipzig, Germany
| | - Jan Halbritter
- University Hospital Leipzig, Division of Nephrology, Department of Internal Medicine, Leipzig, Germany
| | - Johannes Münch
- University Hospital Leipzig, Division of Nephrology, Department of Internal Medicine, Leipzig, Germany
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10
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Jacobi T, Massier L, Klöting N, Horn K, Schuch A, Ahnert P, Engel C, Löffler M, Burkhardt R, Thiery J, Tönjes A, Stumvoll M, Blüher M, Doxiadis I, Scholz M, Kovacs P. HLA Class II Allele Analyses Implicate Common Genetic Components in Type 1 and Non-Insulin-Treated Type 2 Diabetes. J Clin Endocrinol Metab 2020; 105:5715056. [PMID: 31974565 DOI: 10.1210/clinem/dgaa027] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 01/15/2020] [Indexed: 12/20/2022]
Abstract
CONTEXT Common genetic susceptibility may underlie the frequently observed co-occurrence of type 1 and type 2 diabetes in families. Given the role of HLA class II genes in the pathophysiology of type 1 diabetes, the aim of the present study was to test the association of high density imputed human leukocyte antigen (HLA) genotypes with type 2 diabetes. OBJECTIVES AND DESIGN Three cohorts (Ntotal = 10 413) from Leipzig, Germany were included in this study: LIFE-Adult (N = 4649), LIFE-Heart (N = 4815) and the Sorbs (N = 949) cohort. Detailed metabolic phenotyping and genome-wide single nucleotide polymorphism (SNP) data were available for all subjects. Using 1000 Genome imputation data, HLA genotypes were imputed on 4-digit level and association tests for type 2 diabetes, and related metabolic traits were conducted. RESULTS In a meta-analysis including all 3 cohorts, the absence of HLA-DRB5 was associated with increased risk of type 2 diabetes (P = 0.001). In contrast, HLA-DQB*06:02 and HLA-DQA*01:02 had a protective effect on type 2 diabetes (P = 0.005 and 0.003, respectively). Both alleles are part of the well-established type 1 diabetes protective haplotype DRB1*15:01~DQA1*01:02~DQB1*06:02, which was also associated with reduced risk of type 2 diabetes (OR 0.84; P = 0.005). On the contrary, the DRB1*07:01~DQA1*02:01~DQB1*03:03 was identified as a risk haplotype in non-insulin-treated diabetes (OR 1.37; P = 0.002). CONCLUSIONS Genetic variation in the HLA class II locus exerts risk and protective effects on non-insulin-treated type 2 diabetes. Our data suggest that the genetic architecture of type 1 diabetes and type 2 diabetes might share common components on the HLA class II locus.
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Affiliation(s)
- Thomas Jacobi
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Lucas Massier
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Nora Klöting
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
| | - Katrin Horn
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
- LIFE Research Centre for Civilization Diseases, University of Leipzig, Leipzig, Germany
| | - Alexander Schuch
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
| | - Peter Ahnert
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
| | - Christoph Engel
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
- LIFE Research Centre for Civilization Diseases, University of Leipzig, Leipzig, Germany
| | - Markus Löffler
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
| | - Ralph Burkhardt
- LIFE Research Centre for Civilization Diseases, University of Leipzig, Leipzig, Germany
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Regensburg, Regensburg, Germany
| | - Joachim Thiery
- LIFE Research Centre for Civilization Diseases, University of Leipzig, Leipzig, Germany
- Institute of Laboratory Medicine and Clinical Chemistry, University of Leipzig, Leipzig, Germany
| | - Anke Tönjes
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany
| | - Michael Stumvoll
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany
| | - Matthias Blüher
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany
| | - Ilias Doxiadis
- Institute for Transfusion Medicine, University Hospital of Leipzig, Leipzig, Germany
| | - Markus Scholz
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig, Leipzig, Germany
- LIFE Research Centre for Civilization Diseases, University of Leipzig, Leipzig, Germany
| | - Peter Kovacs
- University of Leipzig Medical Center, IFB Adiposity Diseases, University of Leipzig, Leipzig, Germany
- Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig Medical Center, Leipzig, Germany
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11
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Rebmann V, Doxiadis I, Kubens BS, Grosse-Wilde H. Quantitation of the Human Component C4: Definition of C4 Q0 Alleles and C4A Duplications. Vox Sang 2017. [DOI: 10.1159/000462180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Doxiadis I, Lehmann C. Epitop-(Mis)Matching in der Organtransplantation. Transfusionsmedizin 2016. [DOI: 10.1055/s-0042-114197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- I. Doxiadis
- Institut für Transfusionsmedizin, Universitätsklinikum Leipzig
| | - C. Lehmann
- Institut für Transfusionsmedizin, Universitätsklinikum Leipzig
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13
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Lindenburg I, van Klink J, Inklaar M, Smits-Wintjens V, Verduin E, Koopman H, van Kamp I, Walther F, Schonewille H, Doxiadis I, Kanhai H, van Lith J, van Zwet E, Oepkes D, Brand A, Lopriore E. 419: Health-related quality of life and behavioral outcome after intrauterine transfusion for hemolytic disease of the fetus/newborn. Am J Obstet Gynecol 2013. [DOI: 10.1016/j.ajog.2012.10.585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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DʼOrsogna LJ, van der Meer-Prins E, van der Pol P, Franke-van Dijk M, Zoet Y, Eikmans M, Anholts J, Mulder A, van Kooten C, Rossjohn J, McCluskey J, Roelen D, Doxiadis I, Claas F. ORGAN SPECIFICITY OF CROSS-REACTIVE ALLOGENEIC RESPONSES BY VIRAL SPECIFIC MEMORY T-CELLS. Transplantation 2010. [DOI: 10.1097/00007890-201007272-00454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Doxiadis I, Fijter JD, Haasnoot G, Mallat M, Persijn G, Claas F. Identification of parameters that contribute to a successful kidney retransplantation. Hum Immunol 2005. [DOI: 10.1016/j.humimm.2005.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Spyropoulou-Vlachou M, Doxiadis I, Vrani V, Peste K, Stavropoulos-Giokas C. The effect of HLA-class II genetic polymorphism on susceptibility to Type I diabetes in Greeks. Hum Immunol 2005. [DOI: 10.1016/j.humimm.2005.08.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Doxiadis I, Witvliet M, Duquesnoy R, Persijn G, Claas F. The alternative to desensitization of highly sensitized kidney patients is the acceptable mismatch program: Short waiting time, reduced costs, and excellent graft outcome. Hum Immunol 2005. [DOI: 10.1016/j.humimm.2005.08.222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Baan C, Peeters A, Lemos F, Uitterlinden A, Doxiadis I, Claas F, Ijzermans J, Roodnat J, Weimar W. Fundamental role for HO-1 in the self-protection of renal allografts. Am J Transplant 2004; 4:811-8. [PMID: 15084179 DOI: 10.1111/j.1600-6143.2004.00420.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Tissue attenuates to injury by the effects of heme oxygenase (HO)-1. The induction of HO-1 expression is modulated by a (GT)(n) dinucleotide polymorphism in the promoter of the gene, of which increased activity is associated with short (S) (<or=27) repeats. We investigated the influence of this HO-1 gene polymorphism on renal transplant survival. DNA from 387 recipients and 384 donors was genotyped and we divided the HO-1 alleles into two subclasses, the S (<or=27 repeats) class and long (L) class (>27 repeats). Graft survival was associated with donor and not with recipient HO-1 gene polymorphism (log rank p = 0.005; hazard ratio 0.51, 95% CI 0.32-0.83). The beneficial effect of the donor HO-1 genotype was observed in grafts exposed to prolonged cold ischemia time and acute rejection. Patients who received a kidney from L-homozygotes lost their graft significantly more often to chronic allograft nephropathy (CAN) than carriers of S-alleles (p = 0.015). Multivariate analysis showed reduced risk for graft failure in kidneys with S-alleles in comparison to L-homozygotes (odds ratio 0.50, 95% CI 0.27-0.93, p = 0.03). Kidneys that are carriers of HO-1 S-allele are less vulnerable to tissue injury resulting in less CAN and better graft survival.
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Affiliation(s)
- Carla Baan
- Department of Internal Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands.
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19
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Roodnat JI, van Riemsdijk IC, Mulder PGH, Doxiadis I, Claas FHJ, IJzermans JNM, van Gelder T, Weimar W. The superior results of living-donor renal transplantation are not completely caused by selection or short cold ischemia time: a single-center, multivariate analysis. Transplantation 2003; 75:2014-8. [PMID: 12829903 DOI: 10.1097/01.tp.0000065176.06275.42] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND The results of living-donor (LD) renal transplantations are better than those of postmortem-donor (PMD) transplantations. To investigate whether this can be explained by a more favorable patient selection procedure in the LD population, we performed a Cox proportional hazards analysis including variables with a known influence on graft survival. METHODS All patients who underwent transplantations between January 1981 and July 2000 were included in the analysis (n=1,124, 2.6% missing values). There were 243 LD transplantations (including 30 unrelated) and 881 PMD transplantations. The other variables included were the following: donor and recipient age and gender, recipient original disease, race, current smoking habit, cardiovascular disease, body weight, peak and current panel reactive antibody, number of preceding transplants and type and duration of renal replacement therapy, and time since failure of native kidneys. In addition, the number of human leukocyte antigen identical combinations, first and second warm and cold ischemia periods, left or right kidney and fossa, donor kidney anatomy, donor serum creatinine and proteinuria, and transplantation year were included. RESULTS In a multivariate model, donor origin (PMD vs. LD) significantly influenced the graft failure risk censored for death independently of any of the other risk factors (P=0.0303, relative risk=1.75). There was no time interaction. When the variable cold ischemia time was excluded in the same model, the significance of the influence of donor origin on the graft failure risk increased considerably, whereas the magnitude of the influence was comparable (P=0.0004, relative risk=1.92). The influence of all other variables on the graft failure risk was unaffected when the cold ischemia period was excluded. The exclusion of none of the other variables resulted in a comparable effect. Donor origin did not influence the death risk. CONCLUSION The superior results of LD versus PMD transplantations can be partly explained by the dichotomy in the cold ischemia period in these populations (selection). However, after adjustment for cold ischemia periods, the influence of donor origin still remained significant, independent of any of the variables introduced. This superiority is possibly caused by factors inherent to the transplanted organ itself, for example, the absence of brain death and cardiovascular instability of the donor before nephrectomy.
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Affiliation(s)
- J I Roodnat
- Department of Internal Medicine, University Hospital Rotterdam-Dijkzigt, The Netherlands.
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20
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Rozman P, Drabbels J, Schipper RF, Doxiadis I, Stein S, Claas FH. Genotyping for human platelet-specific antigens HPA-1, -2, -3, -4 and -5 in the Slovenian population reveals a slightly increased frequency of HPA-1b and HPA-2b as compared to other European populations. Eur J Immunogenet 1999; 26:265-9. [PMID: 10457889 DOI: 10.1046/j.1365-2370.1999.00142.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Typing of human platelet alloantigens (HPA) is necessary in various clinical situations. The purpose of this study was to type a random sample of the Slovenian population for HPA alleles, in order to obtain genetic population data. A total of 152 unrelated Slovenian blood donors were genotyped for HPA-1, -2, -3, -4 and -5 alleles using a simple method that enables simultaneous and complete determination of HPA genotypes. Ten different polymerase chain reactions employing sequence-specific priming (PCR-SSP), which worked in identical cycling conditions, were used. The allele frequencies were 0.809 for HPA-1a, 0.191 for HPA-1b, 0.891 for HPA-2a, 0.109 for HPA-2b, 0.591 for HPA-3a, 0.407 for HPA-3b, 0.997 for HPA-4a, 0.00 for HPA-4b, 0.934 for HPA-5a and 0.066 for HPA-5b. When compared to results of studies of various other Caucasian populations, our population displayed a slightly but not significantly higher proportion of the HPA-1b and 2b alleles.
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Affiliation(s)
- P Rozman
- Blood Transfusion Centre of Slovenia, Ljubljana, Slovenia
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21
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Mulder A, Kardol M, Koelman C, Koopman L, Brouwenstijn N, Uit het Broek C, Doxiadis I, Bruning J, Burlingham W, Claas F. Diverse application of human monocional HLA-antibodies originally defined by cytotoxicity. Immunol Lett 1997. [DOI: 10.1016/s0165-2478(97)86513-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Koelman C, Mulder A, Jutte N, Balk A, Weimar W, Doxiadis I, Claas F. The application of human monoclonal antibodies for monitoring donor derived soluble HLA in the serum of heart transplant recipients. Immunol Lett 1997. [DOI: 10.1016/s0165-2478(97)85597-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Doxiadis I. Differential immunogenicity of HLA-DP epitopes in the primary MLC. Immunol Lett 1997. [DOI: 10.1016/s0165-2478(97)88721-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Stein S, Drabbels J, van 't Sant P, Witvliet MD, Bein G, Claas FH, Doxiadis I. The use of DNA typing for human platelet-specific antigens in the daily routine: a case report. Vox Sang 1996; 71:131. [PMID: 8873428 DOI: 10.1046/j.1423-0410.1996.7120131.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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25
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Mulder A, Kardol MJ, Niterink JGS, Parlevliet JH, Marrari M, Tanke J, Bruning JW, Duquesnoy RJ, Doxiadis I, Claas FHJ. Development of HLA-human monoclonal antibodies. Hum Immunol 1996. [DOI: 10.1016/0198-8859(96)84914-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Abstract
We determined the C4 plasma concentrations of 48 genotypically CA4- and C4B-defined unrelated individuals from 34 families with a total of 196 members by an enzyme-linked immunosorbent assay using Rg:1,2 (C4A) and Ch:1 (C4B) specific monoclonal antibodies. The results obtained allowed the establishment of rules for the detection of C4 Q0 alleles in the heterozygous form and of C4A gene duplications. In the present study seven homoduplications of the C4A 3 allotype were defined which had not been detected by allotyping. This procedure allows the simple, reliable, and quick determination of Rg:1,2 and Ch:1 plasma levels which are not influenced by daily rhythms of C4 production.
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Affiliation(s)
- V Rebmann
- Department of Immunology, University Hospital, Essen, FRG
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27
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Knop J, Bonsmann G, Kind P, Doxiadis I, Vögeler U, Doxiadis G, Goerz G, Grosse-Wilde H. Antigens of the major histocompatibility complex in patients with chronic discoid lupus erythematosus. Br J Dermatol 1990; 122:723-8. [PMID: 2369554 DOI: 10.1111/j.1365-2133.1990.tb06258.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The frequencies of the major histocompatibility complex class I, class II and class III antigens were determined in 130 patients (88 women and 42 men) with chronic discoid lupus erythematosus, and compared with those of 764 healthy controls. A significant increase in HLA-B7 (38.0% in the patients vs. 25.8% in the control group), HLA-B8 (29.5% vs. 17.4%), HLA-Cw7 (58.9% vs. 26.1%), HLA-DR2 (46.9% vs. 29.7%), HLA-DR3 (32.0% vs. 19.4%), HLA-DQw1 (76.6% vs. 60.5%), and a decrease in HLA-A2 (41.9% vs. 55.7%) was found. The calculated relative risk values for the respective antigens markedly increased when two or more antigens were present in one patient, with a maximum relative risk value of 7.4 for the combinations of HLA-Cw7, DR3, DQw1 and HLA-B7, Cw7 and DR3, which were found in 17.2% of the patients and in only 2.3% of the controls.
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Affiliation(s)
- J Knop
- Department of Dermatology, University of Mainz, F.R.G
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28
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Teichner M, Krumbacher K, Doxiadis I, Doxiadis G, Fournel C, Rigal D, Monier JC, Grosse-Wilde H. Systemic lupus erythematosus in dogs: association to the major histocompatibility complex class I antigen DLA-A7. Clin Immunol Immunopathol 1990; 55:255-62. [PMID: 1691064 DOI: 10.1016/0090-1229(90)90101-u] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The DLA-A,B antigens and the allotypes of the fourth complement component have been determined in German shepherd dogs suffering from systemic lupus erythematosus. We have typed 26 unrelated affected dogs, 11 animals of a three generation family, and 16 dogs of a colony with a high frequency of the disease. The results obtained from the 26 unrelated diseased dogs were compared to those determined in the 23 unaffected German shepherds. The antigen DLA-A7 was found to be predominant in the diseased group with a c2 = 11.02, Pc = 0.02, and a relative risk for the carriers of 11.93. The antigens DLA-A1 and DLA-B5 were negatively associated to the disease (c2 = 14.95, Pc = 0.001, and c2 = 17.16, P = 0.0008 respectively) and thus may be of protective nature. These data were further substantiated by the typing of the three generation family and the colony.
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Affiliation(s)
- M Teichner
- Laboratoire d'Immunologie, UFR Alexis Carrel, Lyon, France
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29
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Doxiadis I, Dölken P, Schneider ME, Wernet P, Grosse-Wilde H. Heterogeneity in protein patterns of CGL blast crisis cells: discrimination between lymphatic and myeloic lineages. Haematol Blood Transfus 1990; 33:62-6. [PMID: 2323663 DOI: 10.1007/978-3-642-74643-7_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Studies on cell-membrane-bound proteins in the human hematopoetic system revealed that the expression of certain peptides is restricted to the differentiation lineage. We applied discontinuous polyacrylamide gel electrophoresis of triton X-114 lysates to identify such proteins for a new diagnostic approach in human leukemia. A polypeptide with an apparent molecular mass range of 24 kd (p24) was found predominantly in cells of chronic granulocytic leukemia (CGL), myeloic type of blast crisis, and normal granulocytes. The data presented here suggest a role of this protein in the biology of malignant cells in chronic granulocytic leukemia throughout the course of the disease.
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MESH Headings
- Biomarkers, Tumor/analysis
- Blast Crisis/metabolism
- Cell Differentiation
- Electrophoresis, Polyacrylamide Gel
- Granulocytes/analysis
- Humans
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Leukemia, Myeloid, Acute/metabolism
- Membrane Proteins/analysis
- Neoplasm Proteins/analysis
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Affiliation(s)
- I Doxiadis
- Institute of Immunogenetics, University Hospital of Essen, FRG
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30
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Doxiadis I, Doxiadis G, Beelen DW, Frenz G, Schaefer UW, Vögeler U, Grosse-Wilde H. Complotyping and subtyping of MHC class I gene products in haplotype determination for bone marrow transplantation. Haematol Blood Transfus 1990; 33:709-11. [PMID: 2323671 DOI: 10.1007/978-3-642-74643-7_130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- I Doxiadis
- Institute of Immunogenetics, University Hospital Essen, FRG
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31
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Abstract
A simplified enzyme linked immunosorbent assay utilizing an HLA class I framework-specific monoclonal antibody and a polyclonal enzyme linked beta-2 microglobulin specific antiserum has been established for the quantitative measurement of soluble HLA class I molecules. A total of 219 unrelated healthy individuals and 137 members of 28 families typed for HLA were analyzed for their non-membrane bound, i.e. soluble HLA-A,B,C antigens (sHLA-A,B,C). As reported by others, we observed associations of higher or lower sHLA-A,B,C values to particular HLA antigens: High plasma values were observed in probands positive for HLA-A23, A24, A29, Aw33, Bw65, and Cw8 and low values in HLA-B27 and B37 positive individuals. However, as shown by family studies, levels of sHLA-A,B,C were apparently not controlled by the MHC haplotypes alone, since no significant difference between HLA identical siblings and two haplotype different individuals could be detected. Thus, additional non-MHC linked gene(s) may be involved in the release of class I gene products.
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Affiliation(s)
- I Doxiadis
- Institute of Immunogenetics, University Hospital of Essen, Federal Republic of Germany
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32
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Westhoff U, Doxiadis I, Beelen DW, Schaefer UW, Grosse-Wilde H. Soluble HLA class I concentrations and GVHD after allogeneic marrow transplantation. Transplantation 1989; 48:891-3. [PMID: 2815267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- U Westhoff
- Department of Immunogenetics, University Hospital of Essen, Federal Republic of Germany
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33
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Abstract
Immunoadsorption of soluble HLA class I antigens onto immunobeads, one-dimensional iso-electric focusing of these proteins and subsequent immunoblotting allows a biochemical identification of HLA class I allotypes. The distinct protein bands can be clearly attributed to particular HLA antigens and are comparable to those observed after detergent solubilization of membrane-bound HLA antigens. Segregation analysis showed that the biochemically detected pattern of soluble class I gene products followed Mendelian inheritance. However, antigens such as HLA-A1, -A2, -B8, and -B51 were not always clearly detectable, a phenomenon attributable to either different plasma concentrations of these HLA antigens or variable affinity of the monoclonal antibody used to capture class I antigens. These results show that in principle allotyping of HLA class I using plasma as the antigen source is feasible, but with the limitation that some antigens may not be easily detected in some individuals.
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Affiliation(s)
- H Grosse-Wilde
- Institut für Immungenetik, Universitätsklinikum Essen, F.R.G
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34
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Abstract
Soluble HLA class I proteins have been found in serum or plasma of healthy and diseased individuals. Here we present evidence that these molecules can be readily used for determination of the HLA type by biochemical methods. Immunoprecipitation of the soluble class I gene products using monomorphic monoclonal antibodies coated to immunobeads and one-dimensional isoelectric focusing followed by immunoblotting represents a feasible and reproducible technique for typing. Analysis of these gene products in families (n = 12, with a total of 62 individuals) as well as in the population (n = 82) showed that all serologically defined antigens tested to date were present in plasma. A reference chart established primarily for the membrane-bound antigens could also be used for the soluble ones.
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Affiliation(s)
- I Doxiadis
- Institute of Immunogenetics, University Hospital of Essen, FRG
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35
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Frenz G, Doxiadis I, Vögeler U, Grosse-Wilde H. HLA class I biochemistry: definition and frequency determination of subtypes by one-dimensional isoelectric focusing and immunoblotting. Vox Sang 1989; 56:190-5. [PMID: 2728397 DOI: 10.1111/j.1423-0410.1989.tb02025.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Previous biochemical studies of HLA class I gene products were based on the use of radiolabelled lymphoblastoid cell lines and/or mitogen-stimulated peripheral blood lymphocytes (PBL). We present here a nonradioactive methodology for defining HLA class I polymorphism on a small number of cells, such as 5 x 10(6) lymphocytes, the vitality of which is not a requirement in contrast to radiolabelling techniques, where 1-2 x 10(6) PBL are needed. We analyzed 54 serologically typed families with a total of 261 individuals and 214 haplotypes by one-dimensional isoelectric focusing and subsequent immunoblotting, using a polyclonal anti-class I heavy chain serum. The banding patterns segregated within families and correlated with the serological results. A substantial number of HLA-A and HLA-B products appeared biochemically heterogeneous allowing the definition of subtypes and the calculation of their frequencies.
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Affiliation(s)
- G Frenz
- Institute of Immunogenetics, University Hospital of Essen, FRG
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36
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Frenz G, Doxiadis I, Vögeler U, Grosse-Wilde H. HLA Class I Biochemistry:
Definition and Frequency Determination of Subtypes by
One-Dimensional Isoelectric Focusing and Immunoblotting. Vox Sang 1989. [DOI: 10.1159/000460960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Doxiadis G, Doxiadis I, Frenz G, Vögeler U, Grosse-Wilde H. Relevance of complotyping and subtyping of MHC class I gene products in haplotype definition for allogeneic bone marrow transplantation. Bone Marrow Transplant 1989; 4:17-22. [PMID: 2647182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In preparation for a bone marrow transplantation 217 patients and their families were complotyped for Bf, C4A and C4B in addition to the routinely performed HLA-A,B,C,DR and HLA-D typing. In 147 families uncertainties in haplotype definition occurred which could be solved in 37 cases (25%) by complotyping. Additionally, patients and their relatives were subtyped for class I gene products by one-dimensional isoelectric focusing, a method by which serologically identical HLA-A, B, or C antigens could be split in five out of 22 cases tested. The results obtained clearly show the relevance of both methodologies for finding the best match of donor/recipient pairs to help to prevent MHC-induced graft-versus-host disease after bone marrow transplantation.
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Affiliation(s)
- G Doxiadis
- Institute of Immunogenetics, University Hospital of Essen, FRG
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Doxiadis I, Grosse-Wilde H. Typing for HLA Class I Gene Products Using Plasma as Source. Vox Sang 1989. [DOI: 10.1159/000460961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Doxiadis I, Dölken P, Schneider M, Wernet P, Grosse-Wilde H. Heterogeneity in protein patterns of cells from terminal blast crisis in chronic granulocytic leukemia: discrimination between lymphatic and myeloid lineages. Leukemia 1988; 2:57S-62S. [PMID: 3199880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Terminal blast crisis cells of chronic granulocytic leukemia are biochemically distinct. Triton-X-114 detergent phase lysates revealed that myeloid types express predominantly proteins of a 24 kd apparent molecular weight range, whereas lymphatic types do not express these molecules but a 55 kd protein band. These biochemical differences, observed in the poorly differentiated blast crisis cells, are also found in well differentiated hemopoietic malignancies such as chronic lymphatic leukemia, or in mature granulocytes isolated from healthy individuals. The results support the concept of the different lineages of blast crisis cells in chronic granulocytic leukemia but question the role of these proteins in cell differentiation. In addition, the presence or absence of these proteins provide a helpful tool for classifying blast crises of chronic granulocytic leukemia.
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Affiliation(s)
- I Doxiadis
- Institute of Immunogenetics, University Hospital of Essen, F.R.G
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Beelen DW, Graeven U, Schulz G, Grosse-Wilde H, Doxiadis I, Schaefer UW, Quabeck K, Sayer H, Schmidt CG. Treatment of acute graft-versus-host disease after HLA-partially matched marrow transplantation with a monoclonal antibody (BMA031) against the T cell receptor. First results of a phase-I/II trial. Onkologie 1988; 11:56-8. [PMID: 3283628 DOI: 10.1159/000216484] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
As part of an ongoing phase-I/II trial, 2 patients received a 5-day treatment course with a murine monoclonal antibody (MAB) directed against the human T cell receptor (BMA031) as primary therapy of acute grade III skin and gastro-intestinal graft-versus-host disease (GvHD) occurring after allogeneic bone marrow transplantation (BMT). All MAB infusions were tolerated without side effects. A complete response of all symptoms of acute GvHD could be attained by MAB therapy under a continued baseline immunosuppression with cyclosporin (CSP), and both patients remain alive and disease-free at 7 and 8 months after therapy without evidence of chronic GvHD. Although the exact treatment scheme has still to be defined, we conclude that this MAB may be useful as primary therapy of acute GvHD. However, the potential hazards of 'in vivo' therapy with MABs directed against T lymphocytes call for a critical evaluation of this treatment modality.
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Affiliation(s)
- D W Beelen
- Department of Internal Medicine (Tumor Research), West German Tumor Center, University Hospital Essen, FRG
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Parosi B, Doxiadis I, Longo A, Wolters P, Morabito A, Malfatto C, Deiana F, Vijod au]H. Grosse-Wilde M, Ferrara G. European collection for biomedical research. Hum Immunol 1988. [DOI: 10.1016/0198-8859(88)90227-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Grosse-Wilde H, Genth E, Grevesmühl A, Vögeler U, Zarnowski H, Mierau R, Doxiadis G, Doxiadis I, Maas D. HLA-DR4 and Gm 1;21 haplotypes are associated with pseudolupus induced by venopyronum dragées. Arthritis Rheum 1987; 30:878-83. [PMID: 3498493 DOI: 10.1002/art.1780300806] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The phenotypic frequencies of human major histocompatibility complex class I, II, and III antigens and immunoglobulin allotypes (Gm factors) were determined in 56 patients (55 women, 1 man) who had lupus-like disease induced by venopyronum dragées. The findings in these patients were compared with those of a control group. We found a significant increase of HLA-DR4 (57.1% versus 26.5%, relative risk [RR] 3.7) and a decrease of HLA-DR3 (3.6% versus 19.1%, RR 0.16) in the patient group. In addition, the haplotype Gm 1;21 (60.7% versus 32.9%, RR 3.2), and the phenotype Gm 1,3;5,21 (46.4% versus 25.8%, RR 2.5) were significantly increased. Both the haplotype Gm 1;21 and the phenotype Gm 1,3;5,21 are associated with HLA-DR4 in pseudolupus patients but not in controls. The coincidence of HLA-DR4 and Gm 1;21 markedly increases the risk of acquiring pseudolupus (RR 6.9). We conclude that the pathogenesis of pseudolupus is influenced by at least 2 independent genetic factors. A similar HLA association has been described in hydralazine-induced lupus, and this suggests a common pathogenic mechanism.
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Abstract
As a collaborative work of three laboratories the polymorphism of the canine fourth complement component (C4) was studied in a total of 131 unrelated dogs from different breeds and mongrels. Using high voltage electrophoresis followed by an immunoblotting technique, we detected eight distinct variants. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of canine C4 showed an additional heterogeneity of the alpha and gamma chains which resulted in a total of 11 variants in the population studied. So that more precise information concerning the respective C4 allotypes will be available, a nomenclature is proposed designating not only the migration pattern of the C4 variants in agarose gels but also the heterogeneity of the C4 chains observed in SDS-PAGE.
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Bull RW, Vriesendorp HM, Cech R, Grosse-Wilde H, Bijma AM, Ladiges WL, Krumbacher K, Doxiadis I, Ejima H, Templeton J. Joint report of the Third International Workshop of Canine Immunogenetics. II. Analysis of the serological typing of cells. Transplantation 1987; 43:154-61. [PMID: 3798556 DOI: 10.1097/00007890-198701000-00033] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Using a standardized microlymphocytotoxicity assay, seven international laboratories evaluated 144 anti-dog lymphocyte antigen (DLA) sera in 319 mixed breed and 152 Beagle dogs. The workshop confirmed the serological definitions for DLA-A2, A3, A9; DLA-B4, B5, B6, B13; DLA-C11(Cwl); and C12(Cw2). Two new specificities were assigned to the DLA-A locus (Aw14 and Aw15) in only the mixed breed dogs. A third specificity (Cw3), was assigned to the DLA-C locus. The antigen and gene frequencies of these alleles differed between the two groups of dogs, but the frequencies of the "blank" were similar in both groups. Future international collaborations will be necessary to definite more completely the polymorphisms of the major histocompatibility complex (MHC) of the dog. Those efforts will benefit from the standard serological test established in this workshop.
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Grosse-Wilde H, Doxiadis I, Vögeler U, Mahmoud HK, Schäfer UW, Beelen DW, Ploegh HL. An HLA lost mutation may lead to leukemic relapse of recipient type six years after bone marrow transplantation. Haematol Blood Transfus 1987; 30:571-3. [PMID: 3305222 DOI: 10.1007/978-3-642-71213-5_103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Grosse-Wilde H, Krumbacher K, Schüning F, Doxiadis I, Mahmoud HK, Emde C, Schmidt-Weinmar A, Schaefer UW. Immune transfer studies in canine allogeneic marrow graft donor-recipient pairs. Transplantation 1986; 42:64-7. [PMID: 3523884 DOI: 10.1097/00007890-198607000-00014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Transfer of immunity occurring with bone marrow grafting was studied using the dog as a preclinical model. Allogeneic bone marrow transplantation (BMT) was performed between DLA-identical beagle litter-mates. The donors were immunized with tetanus toxoid (TT) or sheep red blood cells (SRBC), and their humoral response was monitored by hemagglutination. The recipients of bone marrow from TT-immunized donors showed a marked increase of antibody titer one week posttransplantation, while in the recipients of marrow from SRBC immunized donors the antibody titers were considerably lower. Within the following 60 days the antibody titers in both groups diminished gradually to pregrafting levels. Control experiments in which cell-free plasma from donors immunized with TT and SRBC respectively was transfused indicated that the initial rise of specific antibody titers after marrow grafting is likely to be due to a passive transfer of humoral immunity. A single challenge of these marrow graft recipients with the respective antigen 15-18 weeks posttransplantation led to a secondary type of humoral immune response. In addition, it could be demonstrated that transfer of memory against TT or SRBC was independent from the actual antibody titer and the time of vaccination of the donor. One dog was immunized with TT after serving as marrow donor. When the donor had shown an antibody response, a peripheral blood leukocytes (PBL) transfusion was given to his chimera. Subsequent challenge of the latter resulted in a secondary type of specific antibody response. This indicates that specific cellular-bound immunological memory can be transferred after BMT from the donor to his allogeneic bone marrow chimera by transfusion of peripheral blood leukocytes. The data presented may be of importance in clinical BMT to protect patients during the phase of reduced immune reactivity by transfer of memory cells from histocompatible immunized donors.
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Neefjes JJ, Doxiadis I, Stam NJ, Beckers CJ, Ploegh HL. An analysis of class I antigens of man and other species by one-dimensional IEF and immunoblotting. Immunogenetics 1986; 23:164-71. [PMID: 3957414 DOI: 10.1007/bf00373817] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A procedure for the molecular identification of MHC class I products based on 1-D IEF and subsequent immunoblotting is described. Optimal conditions for 1-D IEF, the electrophoretic transfer of proteins out of denaturing, nonionic detergent-containing gels to nitrocellulose, and the requisite antibodies, both polyclonal and monoclonal, for the visualization of class I heavy chains have been established. Cross-reactivity of antibodies has enabled the biochemical analysis of class I heavy chains in the dog. The procedure reported here requires modest amounts of cells and allows a rapid molecular characterization of class I heavy chain polymorphisms in man and other species without the need for radiochemical methods.
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Deeg HJ, Raff RF, Grosse-Wilde H, Bijma AM, Buurman WA, Doxiadis I, Kolb HJ, Krumbacher K, Ladiges W, Losslein KL. Joint report of the Third International Workshop on Canine Immunogenetics. I. Analysis of homozygous typing cells. Transplantation 1986; 41:111-7. [PMID: 2934876 DOI: 10.1097/00007890-198601000-00022] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The Third International Workshop on Canine Immunogenetics involved 80 potentially DLA-D homozygous typing cells obtained from dogs of various breeds and submitted from five laboratories in Europe and the United States. Mutual reactivity of all cells was studied in mixed leukocyte cultures, and stabilized relative responses were used for analysis. Intralaboratory and interlaboratory comparisons of results suggest that a stabilized relative response of 30% represents an acceptable parameter for "typing responses" indicating phenotypic DLA-D identity of stimulator and responder cells. Using this criterion, 10 clusters of homozygous typing cells were defined and accepted on an international level, and they were assigned the specificities Dw1 to Dw10. At least six additional (provisional) specificities were recognized that were well characterized within individual laboratories but require additional testing before workshop specificities can be assigned. These data show that DLA-D typing is feasible and represents a useful tool in the genetic analysis of the canine major histocompatibility complex. Much work is needed to confirm the present results in family studies, to determine gene frequencies, and to analyze at a molecular level the antigens responsible for mixed leukocyte culture reactivity.
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Abstract
To allotype human complement component C2, thin layer agarose gel isoelectric focusing of human serum and/or EDTA-plasma was performed followed by direct immunofixation or by immunoblotting with a specific anti-human-C2 antibody. Using reference samples for C2 BC phenotypes and local samples from an HLA, C4, and Bf genotyped family, a differentiation of the C2*B and C2*C variants segregating with the respective HLA haplotype was achieved. The C2 BC phenotype is characterized by a double banding pattern similar to that observed in the haemolytic overlay assay usually used for the detection of C2 polymorphism. An homozygous C2*Q0 reference sample determined by functional assays was shown to be biochemically deficient, as demonstrated by immunofixation and immunoblotting. The visual interpretation of C2 phenotypes was definitely easier after immunofixation and immunoblotting than after an haemolytic overlay assay. In addition, the method for C2 allotyping described here has several advantages, in particular it saves time and tolerates repeated thawing and freezing of the samples.
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