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de Weerd AE, Roelen DL, Betjes MG, Clahsen-van Groningen MC, Haasnoot GW, Kho MM, Reinders ME, Roodnat JI, Severs D, Karahan GE, van de Wetering J. Anti-HLA Class II Antibodies Are the Most Resistant to Desensitization in Crossmatch-positive Living-donor Kidney Transplantations: A Patient Series. Transplant Direct 2024; 10:e1695. [PMID: 39220218 PMCID: PMC11365629 DOI: 10.1097/txd.0000000000001695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 07/07/2024] [Accepted: 07/08/2024] [Indexed: 09/04/2024] Open
Abstract
Background In HLA-incompatible kidney transplantation, the efficacy of desensitization in terms of anti-HLA antibody kinetics is not well characterized. We present an overview of the course of anti-HLA antibodies throughout plasma exchange (PE) desensitization in a series of crossmatch-positive patients. Methods All consecutive candidates in the Dutch HLA-incompatible kidney transplantation program between November 2012 and January 2022 were included. The eligibility criteria were a positive crossmatch with a living kidney donor and no options for compatible transplantation. Desensitization consisted of 5-10 PE with low-dose IVIg. Results A total of 16 patient-donor pairs were included. Patients had median virtual panel-reactive antibody of 99.58%. Cumulative donor-specific anti-HLA antibody (cumDSA) mean fluorescence intensity (MFI) was 31 399 median, and immunodominant DSA (iDSA) MFI was 18 677 for class I and 21 893 for class II. Median anti-HLA antibody MFI response to desensitization was worse in class II as compared with class I (P < 0.001), particularly for HLA-DQ. Class I cumDSA MFI decreased 68% after 4 PE versus 53% in class II. The decrease between the fifth and the 10th PE sessions was modest with 21% in class I versus 9% in class II. Antibody-mediated rejection occurred in 85% of patients, with the iDSA directed to the same mismatched HLA as before desensitization, except for 3 patients, of whom 2 had vigorous rebound of antibodies to repeated mismatches (RMMs). Rebound was highest (86%) in RMM-DSA with prior grafts removed (transplantectomy n = 7), lower (39%) in non-RMM-DSA (n = 30), and lowest (11%) for RMM-DSA with in situ grafts (n = 5; P = 0.018 for RMM-DSA transplantectomy versus RMM-DSA graft in situ). With a median follow-up of 59 mo, 1 patient had died resulting in a death-censored graft survival of 73%. Conclusions Patients with class II DSA, and particularly those directed against HLA-DQ locus, were difficult to desensitize.
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Affiliation(s)
- Annelies E. de Weerd
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | - Dave L. Roelen
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Michiel G.H. Betjes
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | | | - Geert W. Haasnoot
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Marcia M.L. Kho
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | - Marlies E.J. Reinders
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | - Joke I. Roodnat
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | - David Severs
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
| | - Gonca E. Karahan
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Jacqueline van de Wetering
- Department of Internal Medicine, Erasmus MC Transplant Institute, University Medical Center, Rotterdam, The Netherlands
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Jarmi T, Luo Y, Attieh RM, Qie Y, Gadd ME, Hundal T, Mao S, Murthy HS, Taner BC, Kharfan-Dabaja MA, Qin H. CAR T-cell therapy-paving the way for sensitized kidney transplant patients. Kidney Int 2024; 105:1124-1129. [PMID: 38573274 DOI: 10.1016/j.kint.2024.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 01/18/2024] [Accepted: 02/02/2024] [Indexed: 04/05/2024]
Affiliation(s)
- Tambi Jarmi
- Department of Transplantation, Mayo Clinic, Jacksonville, Florida, USA.
| | - Yan Luo
- Regenerative Immunotherapy and CAR-T Translational Research Program, Mayo Clinic, Jacksonville, Florida, USA; Department of Cancer Biology, Mayo Clinic, Jacksonville, Florida, USA
| | - Rose Mary Attieh
- Department of Transplantation, Mayo Clinic, Jacksonville, Florida, USA
| | - Yaqing Qie
- Regenerative Immunotherapy and CAR-T Translational Research Program, Mayo Clinic, Jacksonville, Florida, USA
| | - Martha E Gadd
- Regenerative Immunotherapy and CAR-T Translational Research Program, Mayo Clinic, Jacksonville, Florida, USA
| | - Tanya Hundal
- Regenerative Immunotherapy and CAR-T Translational Research Program, Mayo Clinic, Jacksonville, Florida, USA
| | - Shennen Mao
- Department of Transplantation, Mayo Clinic, Jacksonville, Florida, USA
| | - Hemant S Murthy
- Division of Hematology and Medical Oncology, Department of Internal Medicine, Mayo Clinic, Jacksonville, Florida, USA; Blood and Marrow Transplantation and Cellular Therapy Program, Mayo Clinic, Jacksonville, Florida, USA
| | - Burcin C Taner
- Department of Transplantation, Mayo Clinic, Jacksonville, Florida, USA
| | - Mohamed A Kharfan-Dabaja
- Division of Hematology and Medical Oncology, Department of Internal Medicine, Mayo Clinic, Jacksonville, Florida, USA; Blood and Marrow Transplantation and Cellular Therapy Program, Mayo Clinic, Jacksonville, Florida, USA
| | - Hong Qin
- Regenerative Immunotherapy and CAR-T Translational Research Program, Mayo Clinic, Jacksonville, Florida, USA; Department of Cancer Biology, Mayo Clinic, Jacksonville, Florida, USA; Division of Hematology and Medical Oncology, Department of Internal Medicine, Mayo Clinic, Jacksonville, Florida, USA; Department of Immunology, Mayo Clinic, Rochester, Minnesota, USA.
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Furian L, Bestard O, Budde K, Cozzi E, Diekmann F, Mamode N, Naesens M, Pengel LHM, Schwartz Sorensen S, Vistoli F, Thaunat O. European Consensus on the Management of Sensitized Kidney Transplant Recipients: A Delphi Study. Transpl Int 2024; 37:12475. [PMID: 38665475 PMCID: PMC11043529 DOI: 10.3389/ti.2024.12475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 03/04/2024] [Indexed: 04/28/2024]
Abstract
An increasing number of sensitized patients awaiting transplantation face limited options, leading to fatalities during dialysis and higher costs. The absence of established evidence highlights the need for collaborative consensus. Donor-specific antibodies (DSA)-triggered antibody-mediated rejection (AMR) significantly contributes to kidney graft failure, especially in sensitized patients. The European Society for Organ Transplantation (ESOT) launched the ENGAGE initiative, categorizing sensitized candidates by AMR risk to improve patient care. A systematic review assessed induction and maintenance regimens as well as antibody removal strategies, with statements subjected to the Delphi methodology. A Likert-scale survey was distributed to 53 European experts (Nephrologists, Transplant surgeons and Immunologists) with experience in kidney transplant recipient care. A rate ≥75% with the same answer was considered consensus. Consensus was achieved in 95.3% of statements. While most recommendations aligned, two statements related to complement inhibitors for AMR prophylaxis lacked consensus. The ENGAGE consensus presents contemporary recommendations for desensitization and immunomodulation strategies, grounded in predefined risk categories. The adoption of tailored, patient-specific measures is anticipated to streamline the care of sensitized recipients undergoing renal allografts. While this approach holds the promise of enhancing transplant accessibility and fostering long-term success in transplantation outcomes, its efficacy will need to be assessed through dedicated studies.
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Affiliation(s)
- Lucrezia Furian
- Kidney and Pancreas Transplantation Unit, Department of Surgical, Oncological and Gastroenterological Sciences, School of Medicine and Surgery, University of Padua, Padua, Italy
| | - Oriol Bestard
- Kidney Transplant Unit, Vall d’Hebron University Hospital, Barcelona, Spain
| | - Klemens Budde
- Department of Nephrology and Medical Intensive Care, Charité University Medicine Berlin, Berlin, Germany
| | - Emanuele Cozzi
- Transplant Immunology Unit, Department of Cardiac, Thoracic and Vascular Sciences, School of Medicine and Surgery, University of Padua, Padua, Italy
| | - Fritz Diekmann
- Experimental Nephrology and Transplant Laboratory, August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain
| | | | - Maarten Naesens
- Department of Microbiology, Immunology and Transplantation, Faculty of Medicine, KU Leuven, Leuven, Belgium
- Erasmus MC Transplant Institute, Erasmus University Medical Center Rotterdam, Rotterdam, Netherlands
| | - Liset H. M. Pengel
- Erasmus MC Transplant Institute, Erasmus University Medical Center Rotterdam, Rotterdam, Netherlands
| | - Soren Schwartz Sorensen
- Department of Neurology, Rigshospitalet, Copenhagen University Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Fabio Vistoli
- University of Pisa, Pisa, Italy
- Department of Biothecnological and Applied Clinical Sciences, University of L’Aquila, L’Aquila, Italy
| | - Olivier Thaunat
- Service de Transplantation, Néphrologie et Immunologie Clinique, Hospices Civils de Lyon, Lyon, France
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Maenosono R, Unagami K, Oki R, Fujiwara Y, Banno T, Okada D, Yagisawa T, Kanzawa T, Hirai T, Omoto K, Hanafusa N, Azuma H, Takagi T, Ishida H. The medical cost and outcome of desensitization protocol in kidney transplantation recipients with high immunological risks. Int J Urol 2024; 31:422-429. [PMID: 38193573 DOI: 10.1111/iju.15383] [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: 05/24/2023] [Accepted: 12/17/2023] [Indexed: 01/10/2024]
Abstract
BACKGROUND Kidney transplantation is a well-established alternative in renal replacement therapy. Compared with hemodialysis, low-immunological-risk kidney transplantation can reduce the medical treatment costs associated with end-stage renal disease. However, there are few reports on whether high-immunological-risk kidney transplantation reduces the financial burden on governments. We investigated the medical costs of high-immunological-risk kidney transplantation in comparison with the cost of hemodialysis in Japan. METHODS We compared the medical costs of high-immunological-risk kidney transplantation with those of hemodialysis. 15 patients who underwent crossmatch-positive and/or donor-specific antibody-positive kidney transplantations between 2020 and 2021 were enrolled in this study. The patients received intravenous immunoglobulin, plasmapheresis, and rituximab as desensitizing therapy. RESULTS Acute antibody-mediated rejection was detected in nine (60%) recipients, while there were no indications of graft function deterioration during the follow-up. For each patient, the transplant hospitalization cost was 38 428 ± 8789 USD. However, the cumulative costs were 59 758 ± 10 006 USD and 79 781 ± 16 366 USD, at 12 and 24 months, respectively. Compared with hemodialysis (34 286 USD per year), high-immunological-risk kidney transplantation tends to be expensive in the first year, but the cost is likely to be lower than that of hemodialysis after 3 years. CONCLUSIONS Although kidney transplantation is initially expensive compared with hemodialysis, the medical cost becomes advantageous after 3 years even in kidney transplant recipients with high immunological risk.
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Affiliation(s)
- Ryoichi Maenosono
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
- Department of Urology, Osaka Medical and Pharmaceutical University, Osaka, Japan
| | - Kohei Unagami
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
- Department of Organ Transplant Medicine, Tokyo Women's Medical University, Tokyo, Japan
| | - Rikako Oki
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
- Department of Organ Transplant Medicine, Tokyo Women's Medical University, Tokyo, Japan
| | - Yuya Fujiwara
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
- Department of Urology, Osaka Medical and Pharmaceutical University, Osaka, Japan
| | - Taro Banno
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Daigo Okada
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Takafumi Yagisawa
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Taichi Kanzawa
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Toshihito Hirai
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Kazuya Omoto
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Norio Hanafusa
- Department of Blood Purification, Tokyo Women's Medical University, Tokyo, Japan
| | - Haruhito Azuma
- Department of Urology, Osaka Medical and Pharmaceutical University, Osaka, Japan
| | - Toshio Takagi
- Department of Urology, Tokyo Women's Medical University, Tokyo, Japan
| | - Hideki Ishida
- Department of Organ Transplant Medicine, Tokyo Women's Medical University, Tokyo, Japan
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de Weerd AE, Roelen DL, van de Wetering J, Betjes MGH, Heidt S, Reinders MEJ. Imlifidase Desensitization in HLA-incompatible Kidney Transplantation: Finding the Sweet Spot. Transplantation 2024; 108:335-345. [PMID: 37340532 DOI: 10.1097/tp.0000000000004689] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2023]
Abstract
Imlifidase, derived from a Streptococcus pyogenes enzyme, cleaves the entire immunoglobulin G pool within hours after administration in fully cleaved antigen-binding and crystallizable fragments. These cleaved fragments can no longer exert their antibody-dependent cytotoxic functions, thereby creating a window to permit HLA-incompatible kidney transplantation. Imlifidase is labeled, in Europe only, for deceased donor kidney transplantation in highly sensitized patients, whose chances for an HLA-compatible transplant are negligible. This review discusses outcomes of preclinical and clinical studies on imlifidase and describes the phase III desensitization trials that are currently enrolling patients. A comparison is made with other desensitization methods. The review discusses the immunological work-up of imlifidase candidates and especially the "delisting strategy" of antigens that shift from unacceptable to acceptable with imlifidase desensitization. Other considerations for clinical implementation, such as adaptation of induction protocols, are also discussed. Imlifidase cleaves most of the currently used induction agents except for horse antithymocyte globulin, and rebound of donor-specific antibodies should be managed. Another consideration is the timing and interpretation of (virtual) crossmatches when bringing this novel desensitization agent into the clinic.
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Affiliation(s)
- Annelies E de Weerd
- Department of Internal Medicine, Erasmus Medical Center Transplant Institute, University Medical Center, Rotterdam, the Netherlands
| | - Dave L Roelen
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - Jacqueline van de Wetering
- Department of Internal Medicine, Erasmus Medical Center Transplant Institute, University Medical Center, Rotterdam, the Netherlands
| | - Michiel G H Betjes
- Department of Internal Medicine, Erasmus Medical Center Transplant Institute, University Medical Center, Rotterdam, the Netherlands
| | - Sebastiaan Heidt
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - Marlies E J Reinders
- Department of Internal Medicine, Erasmus Medical Center Transplant Institute, University Medical Center, Rotterdam, the Netherlands
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6
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Gille I, Hagedoorn RS, van der Meer-Prins EMW, Heemskerk MHM, Heidt S. Chimeric HLA antibody receptor T cells to target HLA-specific B cells in solid organ transplantation. HLA 2023; 102:436-448. [PMID: 37370222 DOI: 10.1111/tan.15146] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/19/2023] [Accepted: 06/21/2023] [Indexed: 06/29/2023]
Abstract
HLA-sensitized patients on the transplant waiting list harbor antibodies and memory B cells directed against allogeneic HLA molecules, which decreases the chance to receive a compatible donor organ. Current desensitization strategies non-specifically target circulating antibodies and B cells, warranting the development of therapies that specifically affect HLA-directed humoral immune responses. We developed Chimeric HLA Antibody Receptor (CHAR) constructs comprising the extracellular part of HLA-A2 or HLA-A3 coupled to CD28-CD3ζ domains. CHAR-transduced cells expressing reporter constructs encoding T-cell activation markers, and CHAR-transduced CD8+ T cells from healthy donors were stimulated with HLA-specific monoclonal antibody-coated microbeads, and HLA-specific B cell hybridomas. CHAR T cell activation was measured by upregulation of T cell activation markers and IFNγ secretion, whereas CHAR T cell killing of B cell hybridomas was assessed in chromium release assays and by IgG ELISpot. HLA-A2- and HLA-A3-CHAR expressing cells were specifically activated by HLA-A2- and HLA-A3-specific monoclonal antibodies, either soluble or coated on microbeads, as shown by CHAR-induced transcription factors. HLA-A2 and HLA-A3 CHAR T cells efficiently produced IFNγ with exquisite specificity and were capable of specifically lysing hybridoma cells expressing HLA-A2- or HLA-A3-specific B-cell receptors, respectively. Finally, we mutated the α3 domain of the CHAR molecules to minimize any alloreactive T-cell reactivity against CHAR T cells, while retaining CHAR activity. These data show proof of principle for CHAR T cells to serve as precision immunotherapy to specifically desensitize (highly) sensitized solid organ transplant candidates and to treat antibody-mediated rejection after solid organ transplantation.
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Affiliation(s)
- Ilse Gille
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands
- Department of Hematology, Leiden University Medical Center, Leiden, Netherlands
| | - Renate S Hagedoorn
- Department of Hematology, Leiden University Medical Center, Leiden, Netherlands
| | | | | | - Sebastiaan Heidt
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands
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7
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Vilayur E, van Zwieten A, Chen M, Francis A, Wyld M, Kim S, Cooper T, Wong G. Sex and Gender Disparities in Living Kidney Donation: A Scoping Review. Transplant Direct 2023; 9:e1530. [PMID: 37636486 PMCID: PMC10455160 DOI: 10.1097/txd.0000000000001530] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 06/23/2023] [Accepted: 06/24/2023] [Indexed: 08/29/2023] Open
Abstract
Background Women are more likely than men to be living kidney donors. We summarized the evidence concerning the reasons behind sex and gender disparities in living kidney donation (LKD). Methods A scoping review of quantitative and qualitative evidence on reasons for sex and gender disparities in LKD was conducted from inception to March 2023. Results Of 1123 studies screened, 45 were eligible for inclusion. Most studies were from North America, Europe, and Central Asia (n = 33, 73%). A predominance of women as living donors (55%-65%) was observed in 15 out of 18 (83%) studies. Reasons for sex and gender disparities in LKD included socioeconomic, biological, and cognitive or emotional factors. A gendered division of roles within the families was observed in most studies, with men being the primary income earner and women being the main caregiver. Fear of loss of income was a barrier to male donation. Human leukocyte antigen sensitization through pregnancy in female recipients precluded male partner donation, whereas female donation was supported by altruism and a positive attitude toward LKD. Conclusions Sex imbalance in LKD is prevalent, with a predominance of women as living donors. Such disparities are driven by societal and cultural perceptions of gender roles, pregnancy-induced sensitization, and attitudes toward donation and at least some of these factors are modifiable. Donor compensation to support predonation assessments and income loss, implementation of innovative desensitization treatments, promotion of paired kidney exchange program, and targeted educational initiatives to promote equitable living donation may help to close the gender gap in LKD.
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Affiliation(s)
- Eswari Vilayur
- John Hunter Hospital, Hunter New England Health Service, New Lambton, NSW, Australia
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
| | - Anita van Zwieten
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
- Centre for Kidney Research, Westmead Children’s Hospital, Westmead, NSW, Australia
| | - Mingxing Chen
- Centre for Kidney and Transplantation Research, Westmead Hospital, Westmead, NSW, Australia
| | - Anna Francis
- Department of Nephrology, Queensland Children’s Hospital, Brisbane, QLD, Australia
| | - Melanie Wyld
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
- Centre for Kidney and Transplantation Research, Westmead Hospital, Westmead, NSW, Australia
| | - Siah Kim
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
- Centre for Kidney Research, Westmead Children’s Hospital, Westmead, NSW, Australia
| | - Tess Cooper
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
| | - Germaine Wong
- Sydney School of Public Health, The University of Sydney, Camperdown, NSW, Australia
- Centre for Kidney Research, Westmead Children’s Hospital, Westmead, NSW, Australia
- Centre for Kidney and Transplantation Research, Westmead Hospital, Westmead, NSW, Australia
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8
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Bureau C, Rafat C, Taupin JL, Malard S, Mesnard L, François H, Petit-Hoang C, Ouali N, Hertig A, Jamme M, Buob D, Rondeau E, Galichon P, Luque Y. Immunoadsorption-Based HLA Desensitization in Patients Awaiting Deceased Donor Kidney Transplantation: An Interventional, Non-Randomised, Single Cohort Study. Transpl Int 2023; 36:11212. [PMID: 37680645 PMCID: PMC10481532 DOI: 10.3389/ti.2023.11212] [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: 01/23/2023] [Accepted: 08/01/2023] [Indexed: 09/09/2023]
Abstract
Whether immunoadsorption (IADS) as part of desensitization protocols could facilitate deceased donor kidney transplantation (KT) in highly sensitized (HS) patients remains to be proven. We retrospectively analyzed our IADS based desensitization protocol for deceased donor KTs between 2013 and 2018. Fifteen HS patients (age 52 years [40-56]) were included. Waiting time before IADS was 6 years [5-10] and the interval between IADS initiation and KT was 5 months [1-12] for the 14 transplanted patients. Nine patients had prior KT. Calculated panel reactive antibody decreased significantly during the protocol (99.3% [92.5-99.9] vs. 79.4% [56.7-81.9]; p = 0.004). Death-censored graft survival was 85.7% at 1 and 2 years post-transplantation. One-year median plasma creatinine level was 135 µmol/L [111-202]. Six developed active antibody mediated rejection (ABMR) at 1 year, with a median delay of 13 days [11-26]. Eight patients developed severe infections, including two fatal outcomes. Finally, compared to 93% of patients who received desensitization receiving a KT, only 43% of a control with similar characteristics underwent transplantation. However, no difference was found in overall probability of being alive with a functioning graft at the end of follow-up. The results indicate that our IADS-based desensitization strategy was not effective due to a high rate of ABMR and severe infectious complications which pose a challenge to its universalization.
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Affiliation(s)
- Côme Bureau
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
| | - Cédric Rafat
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
| | - Jean Luc Taupin
- Assistance Publique-Hôpitaux de Paris, Laboratoire Régional d’Histocompatibilité, Hôpital Saint Louis, Paris, France
| | - Stéphanie Malard
- Assistance Publique-Hôpitaux de Paris, Laboratoire Régional d’Histocompatibilité, Hôpital Saint Louis, Paris, France
| | - Laurent Mesnard
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
| | - Hélène François
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
| | - Camille Petit-Hoang
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
| | - Nacera Ouali
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
| | - Alexandre Hertig
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
| | - Matthieu Jamme
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
| | - David Buob
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
- Assistance Publique-Hôpitaux de Paris, Service d’Anatomie et Cytologie Pathologiques, Hôpital Tenon, Paris, France
| | - Eric Rondeau
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
| | - Pierre Galichon
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
| | - Yosu Luque
- Assistance Publique – Hôpitaux de Paris, Soins Intensifs Néphrologiques et Rein Aigu, Département de Néphrologie, Hôpital Tenon, Paris, France
- Sorbonne Université, CoRaKid Inserm UMR_S1155, Paris, France
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9
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Thongprayoon C, Miao J, Jadlowiec CC, Mao SA, Mao MA, Vaitla P, Leeaphorn N, Kaewput W, Pattharanitima P, Tangpanithandee S, Krisanapan P, Nissaisorakarn P, Cooper M, Cheungpasitporn W. Differences between Very Highly Sensitized Kidney Transplant Recipients as Identified by Machine Learning Consensus Clustering. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59050977. [PMID: 37241209 DOI: 10.3390/medicina59050977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 05/10/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023]
Abstract
Background and Objectives: The aim of our study was to categorize very highly sensitized kidney transplant recipients with pre-transplant panel reactive antibody (PRA) ≥ 98% using an unsupervised machine learning approach as clinical outcomes for this population are inferior, despite receiving increased allocation priority. Identifying subgroups with higher risks for inferior outcomes is essential to guide individualized management strategies for these vulnerable recipients. Materials and Methods: To achieve this, we analyzed the Organ Procurement and Transplantation Network (OPTN)/United Network for Organ Sharing (UNOS) database from 2010 to 2019 and performed consensus cluster analysis based on the recipient-, donor-, and transplant-related characteristics in 7458 kidney transplant patients with pre-transplant PRA ≥ 98%. The key characteristics of each cluster were identified by calculating the standardized mean difference. The post-transplant outcomes were compared between the assigned clusters. Results: We identified two distinct clusters and compared the post-transplant outcomes among the assigned clusters of very highly sensitized kidney transplant patients. Cluster 1 patients were younger (median age 45 years), male predominant, and more likely to have previously undergone a kidney transplant, but had less diabetic kidney disease. Cluster 2 recipients were older (median 54 years), female predominant, and more likely to be undergoing a first-time transplant. While patient survival was comparable between the two clusters, cluster 1 had lower death-censored graft survival and higher acute rejection compared to cluster 2. Conclusions: The unsupervised machine learning approach categorized very highly sensitized kidney transplant patients into two clinically distinct clusters with differing post-transplant outcomes. A better understanding of these clinically distinct subgroups may assist the transplant community in developing individualized care strategies and improving the outcomes for very highly sensitized kidney transplant patients.
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Affiliation(s)
- Charat Thongprayoon
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - Jing Miao
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | | | - Shennen A Mao
- Division of Transplant Surgery, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Michael A Mao
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Pradeep Vaitla
- Division of Nephrology, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Napat Leeaphorn
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Jacksonville, FL 32224, USA
| | - Wisit Kaewput
- Department of Military and Community Medicine, Phramongkutklao College of Medicine, Bangkok 10400, Thailand
| | - Pattharawin Pattharanitima
- Department of Internal Medicine, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
| | - Supawit Tangpanithandee
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - Pajaree Krisanapan
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
- Department of Internal Medicine, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
| | - Pitchaphon Nissaisorakarn
- Department of Medicine, Division of Nephrology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | | | - Wisit Cheungpasitporn
- Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA
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10
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Grimaldi V, Pagano M, Moccia G, Maiello C, De Rosa P, Napoli C. Novel insights in the clinical management of hyperimmune patients before and after transplantation. CURRENT RESEARCH IN IMMUNOLOGY 2023; 4:100056. [PMID: 36714552 PMCID: PMC9876744 DOI: 10.1016/j.crimmu.2023.100056] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 01/11/2023] [Accepted: 01/18/2023] [Indexed: 01/24/2023] Open
Abstract
Despite improvements in anti-Human Leucocyte Antigens antibody detection, identification, and characterization offer a better in peri-operative management techniques, antibodies remain a serious cause of morbidity and mortality for patients both before and after organ transplantation. Hyperimmune patients are disadvantaged by having to wait longer to receive an organ from a suitably matched donor. They could benefit from desensitization protocols in both pre- and post-transplantation period. Clinical studies are underway to highlight which best desensitization strategies could be assure the best outcome in both heart and kidney transplantation. Although most clinical evidence about desensitization strategies by using anti-CD20 monoclonal antibodies, proteasome inhibitors, anti-CD38 monoclonal antibodies, interleukin-6 blockade, cysteine protease and complement inhibitors, comes from kidney transplantation studies, many of the debated novel concepts can be easily applied to desensitization also in heart transplantation. Here, we discuss the candidates and recipients' management by using most common standard of care and novel therapeutics, desensitization endpoints, and strategies for future studies.
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Affiliation(s)
- Vincenzo Grimaldi
- U.O.C. Division of Clinical Immunology, Immunohematology, Transfusion Medicine and Transplant Immunology. Regional Reference Laboratory of Transplant Immunology (LIT) (EFI and ASHI Certifications). Department of Internal Medicine and Specialistics, University of Campania "L. Vanvitelli", Naples, Italy,Corresponding author.
| | - Martina Pagano
- U.O.C. Division of Clinical Immunology, Immunohematology, Transfusion Medicine and Transplant Immunology. Regional Reference Laboratory of Transplant Immunology (LIT) (EFI and ASHI Certifications). Department of Internal Medicine and Specialistics, University of Campania "L. Vanvitelli", Naples, Italy
| | - Giusi Moccia
- U.O.C. Division of Clinical Immunology, Immunohematology, Transfusion Medicine and Transplant Immunology. Regional Reference Laboratory of Transplant Immunology (LIT) (EFI and ASHI Certifications). Department of Internal Medicine and Specialistics, University of Campania "L. Vanvitelli", Naples, Italy
| | - Ciro Maiello
- Cardiac Transplantation Unit, Department of Cardiac Surgery and Transplantation, Ospedali dei Colli, Naples, Italy
| | - Paride De Rosa
- General Surgery and Transplantation Unit, "San Giovanni di Dio e Ruggi D'Aragona," University Hospital, Scuola Medica Salernitana, Salerno, Italy
| | - Claudio Napoli
- U.O.C. Division of Clinical Immunology, Immunohematology, Transfusion Medicine and Transplant Immunology. Regional Reference Laboratory of Transplant Immunology (LIT) (EFI and ASHI Certifications). Department of Internal Medicine and Specialistics, University of Campania "L. Vanvitelli", Naples, Italy,Department of Advanced Medical and Surgical Sciences (DAMSS), University of Campania "Luigi Vanvitelli", Naples, Italy
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11
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Gille I, Claas FHJ, Haasnoot GW, Heemskerk MHM, Heidt S. Chimeric Antigen Receptor (CAR) Regulatory T-Cells in Solid Organ Transplantation. Front Immunol 2022; 13:874157. [PMID: 35720402 PMCID: PMC9204347 DOI: 10.3389/fimmu.2022.874157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 04/01/2022] [Indexed: 11/13/2022] Open
Abstract
Solid organ transplantation is the treatment of choice for various end-stage diseases, but requires the continuous need for immunosuppression to prevent allograft rejection. This comes with serious side effects including increased infection rates and development of malignancies. Thus, there is a clinical need to promote transplantation tolerance to prevent organ rejection with minimal or no immunosuppressive treatment. Polyclonal regulatory T-cells (Tregs) are a potential tool to induce transplantation tolerance, but lack specificity and therefore require administration of high doses. Redirecting Tregs towards mismatched donor HLA molecules by modifying these cells with chimeric antigen receptors (CAR) would render Tregs far more effective at preventing allograft rejection. Several studies on HLA-A2 specific CAR Tregs have demonstrated that these cells are highly antigen-specific and show a superior homing capacity to HLA-A2+ allografts compared to polyclonal Tregs. HLA-A2 CAR Tregs have been shown to prolong survival of HLA-A2+ allografts in several pre-clinical humanized mouse models. Although promising, concerns about safety and stability need to be addressed. In this review the current research, obstacles of CAR Treg therapy, and its potential future in solid organ transplantation will be discussed.
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Affiliation(s)
- Ilse Gille
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands.,Department of Hematology, Leiden University Medical Center, Leiden, Netherlands
| | - Frans H J Claas
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands.,Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
| | - Geert W Haasnoot
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands.,Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
| | | | - Sebastiaan Heidt
- Department of Immunology, Leiden University Medical Center, Leiden, Netherlands.,Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
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12
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Ulisses LRDS, Paixão JO, Agena F, de Souza PS, Paula FJ, Bezerra G, Rodrigues H, Panajotopolous N, David-Neto E, de Castro MCR. Desensitization using IVIG alone for living-donor kidney transplant: impact on donor-specific antibodies. J Bras Nefrol 2022; 44:527-532. [PMID: 35438714 PMCID: PMC9838666 DOI: 10.1590/2175-8239-jbn-2021-0200] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/08/2021] [Indexed: 01/26/2023] Open
Abstract
INTRODUCTION Sensitization to human leukocyte antigen is a barrier to. Few data have been published on desensitization using polyvalent human intravenous immunoglobulin (IVIG) alone. METHODS We retrospectively reviewed the of 45 patients with a positive complement-dependent cytotoxicity crossmatch (CDCXM) or flow cytometry crossmatch (FCXM) against living donors from January 2003 to December 2014. Of these, 12 were excluded. Patients received monthly IVIG infusions (2 g/kg) only until they had a negative T-cell and B-cell FCXM. RESULTS During the 33 patients, 22 (66.7%) underwent living donor kidney transplantation, 7 (21.2%) received a deceased donor graft, and 4 (12.1%) did not undergo transplantation. The median class I and II panel reactive antibodies for these patients were 80.5% (range 61%-95%) and 83.0% (range 42%-94%), respectively. Patients (81.8%) had a positive T-cell and/or B-cell CDCXM and 4 (18.2%) had a positive T-cell and/or B-cell FCXM. Patients underwent transplantation after a median of 6 (range 3-16). The median donor-specific antibody mean fluorescence intensity sum was 5057 (range 2246-11,691) before and 1389 (range 934-2492) after desensitization (p = 0.0001). Mean patient follow-up time after transplantation was 60.5 (SD, 36.8) months. Nine patients (45.0%). Death-censored graft survival at 1, 3, and 5 years after transplant was 86.4, 86.4, and 79.2%, respectively and patient survival was 95.5, 95.5, and 83.7%, respectively. CONCLUSIONS Desensitization using IVIG alone is an effective strategy, allowing successful transplantation in 87.9% of these highly sensitized patients.
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Affiliation(s)
- Luiz Roberto de Sousa Ulisses
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil.,Correspondence to: Luiz Roberto de Sousa Ulisses. E-mail:
| | - Jenaine Oliveira Paixão
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil
| | - Fabiana Agena
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil
| | - Patrícia Soares de Souza
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil
| | - Flávio J Paula
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil
| | - Gislene Bezerra
- Universidade de São Paulo, Instituto do Coração da São Paulo,
Laboratório de Imunologia, São Paulo, SP, Brasil
| | - Hélcio Rodrigues
- Universidade de São Paulo, Instituto do Coração da São Paulo,
Laboratório de Imunologia, São Paulo, SP, Brasil
| | - Nicolas Panajotopolous
- Universidade de São Paulo, Instituto do Coração da São Paulo,
Laboratório de Imunologia, São Paulo, SP, Brasil
| | - Elias David-Neto
- Universidade de São Paulo, Hospital das Clínicas, Serviço de
Transplante Renal, São Paulo, SP, Brasil
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13
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Heidt S, Haasnoot GW, van der Linden-van Oevelen MJH, Claas FHJ. Highly Sensitized Patients Are Well Served by Receiving a Compatible Organ Offer Based on Acceptable Mismatches. Front Immunol 2021; 12:687254. [PMID: 34248971 PMCID: PMC8267476 DOI: 10.3389/fimmu.2021.687254] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/14/2021] [Indexed: 01/10/2023] Open
Abstract
Highly sensitized kidney patients accrue on the transplant waiting list due to their broad immunization against non-self Human Leucocyte Antigens (HLA). Although challenging, the best option for highly sensitized patients is transplantation with a crossmatch negative donor without any additional therapeutic intervention. The Eurotransplant Acceptable Mismatch (AM) program was initiated more than 30 years ago with the intention to increase the chance for highly sensitized patients to be transplanted with such a compatible donor. The AM program allows for enhanced transplantation to this difficult to transplant patient group by allocating deceased donor kidneys on the basis of a match with the recipient’s own HLA antigens in combination with predefined acceptable antigens. Acceptable antigens are those HLA antigens towards which the patients has never formed antibodies, as determined by extensive laboratory testing. By using this extended HLA phenotype for allocation and giving priority whenever a compatible donor organ becomes available, organ offers are made for roughly 80% of patients in this program. Up till now, more than 1700 highly sensitized patients have been transplanted through the AM program. Recent studies have shown that the concept of acceptable mismatches being truly immunologically acceptable holds true for both rejection rates and long-term graft survival. Patients that were transplanted through the AM program had a similar rejection incidence and long-term graft survival rates identical to non-sensitized patients transplanted through regular allocation. However, a subset of patients included in the AM program does not receive an organ offer within a reasonable time frame. As these are often patients with a rare HLA phenotype in comparison to the Eurotransplant donor population, extension of the donor pool for these specific patients through further European collaboration would significantly increase their chances of being transplanted. For those patients that will not benefit from such strategy, desensitization is the ultimate solution.
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Affiliation(s)
- Sebastiaan Heidt
- Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
| | - Geert W Haasnoot
- Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
| | | | - Frans H J Claas
- Eurotransplant Reference Laboratory, Leiden University Medical Center, Leiden, Netherlands
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14
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Joher N, Matignon M, Grimbert P. HLA Desensitization in Solid Organ Transplantation: Anti-CD38 to Across the Immunological Barriers. Front Immunol 2021; 12:688301. [PMID: 34093594 PMCID: PMC8173048 DOI: 10.3389/fimmu.2021.688301] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/04/2021] [Indexed: 12/23/2022] Open
Abstract
The presence of anti-human leucocyte antigen (HLA) antibodies in the potential solid organ transplant recipient's blood is one of the main barriers to access to a transplantation. The HLA sensitization is associated with longer waitlist time, antibody mediated rejection and transplant lost leading to increased recipient's morbidity and mortality. However, solid organ transplantation across the HLA immunological barriers have been reported in recipients who were highly sensitized to HLA using desensitization protocols. These desensitization regimens are focused on the reduction of circulating HLA antibodies. Despite those strategies improve rates of transplantation, it remains several limitations including persistent high rejection rate and worse long-term outcomes when compare with non-sensitized recipient population. Currently, interest is growing in the development of new desensitization approaches which, beyond targeting antibodies, would be based on the modulation of alloimmune pathways. Plasma cells appears as an interesting target given their critical role in antibody production. In the last decade, CD38-targeting immunotherapies, such as daratumumab, have been recognized as a key component in the treatment of myeloma by inducing an important plasma cell depletion. This review focuses on an emerging concept based on targeting CD38 to desensitize in the field of transplantation.
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Affiliation(s)
- Nizar Joher
- Assistance Publique-Hôpitaux de Paris AP-HP, Hôpital Universitaire Henri Mondor, Service de Néphrologie et Transplantation, Fédération Hospitalo-Universitaire (Innovative Therapy for Immune Disorders), Créteil, France.,Université Paris Est Créteil UPEC, Institut National de la Santé et de la Recherche Médicale INSERM U955, Institut Mondor de Recherche Biomédicale IMRB, Équipe 21, Créteil, France
| | - Marie Matignon
- Assistance Publique-Hôpitaux de Paris AP-HP, Hôpital Universitaire Henri Mondor, Service de Néphrologie et Transplantation, Fédération Hospitalo-Universitaire (Innovative Therapy for Immune Disorders), Créteil, France.,Université Paris Est Créteil UPEC, Institut National de la Santé et de la Recherche Médicale INSERM U955, Institut Mondor de Recherche Biomédicale IMRB, Équipe 21, Créteil, France
| | - Philippe Grimbert
- Assistance Publique-Hôpitaux de Paris AP-HP, Hôpital Universitaire Henri Mondor, Service de Néphrologie et Transplantation, Fédération Hospitalo-Universitaire (Innovative Therapy for Immune Disorders), Créteil, France.,Université Paris Est Créteil UPEC, Institut National de la Santé et de la Recherche Médicale INSERM U955, Institut Mondor de Recherche Biomédicale IMRB, Équipe 21, Créteil, France
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15
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Lemieux W, Mohammadhassanzadeh H, Klement W, Daniel C, Sapir-Pichhadze R. Matchmaker, matchmaker make me a match: Opportunities and challenges in optimizing compatibility of HLA eplets in transplantation. Int J Immunogenet 2021; 48:135-144. [PMID: 33426788 DOI: 10.1111/iji.12525] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/12/2020] [Accepted: 12/20/2020] [Indexed: 12/20/2022]
Abstract
The development of donor-specific antibodies (DSAs) is a major complication in transplantation, which is associated with inferior graft survival, impaired quality of life, and increased healthcare costs. DSA develop upon recognition of nonself HLA by the recipient's immune system. HLA molecules contain epitopes, which are the surface regions of HLA molecules recognized by antibodies. HLAMatchmaker is an algorithm for assessing donor:recipient HLA compatibility at the level of structurally defined HLA targets called eplets. The consideration of eplets, rather than the whole HLA molecule, could offer some advantages when classifying the immune risk associated with particular donor:recipient pairs. Assessing compatibility at the level of HLA eplets could decrease misclassification of post-transplant immune risk by improving specificity, when antibodies are confirmed to be directed against donor eplets missing from the recipient's repertoire of eplets. Consideration of eplets may also increase the sensitivity of immune risk assessment, when identifying mismatched eplets that could give rise to new, not previously detected, donor-specific antibodies post-transplant. Eplet matching can serve as a rational strategy for immune risk mitigation. Herein, we review the evolution of HLA (in) compatibility assessment for organ allocation. We outline challenges in the implementation of eplet-based donor:recipient matching, including unavailability of allele-level donor genotypes for 11 HLA loci at the time of organ allocation and difficulty in assessing the hierarchy of immune risk associated with particular HLA eplet mismatches. Opportunities to address some of the current shortcomings of donor genotyping and HLAMatchmaker are also discussed. While there is a demonstrated benefit in the application of HLAMatchmaker for donor: recipient HLA (in)compatibility assessment, evolving long-read genotyping methods, compilation of large data sets with allele-level genotypes, and standardization of methods to verify eplets as determinants of immune-mediated injuries are required before HLA eplet matching is implemented in organ allocation to improve upon transplant outcomes.
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Affiliation(s)
- William Lemieux
- Centre for Outcomes Research and Evaluation (CORE), Research Institute of McGill University Health Centre, Montréal, QC, Canada
| | - Hossein Mohammadhassanzadeh
- Centre for Outcomes Research and Evaluation (CORE), Research Institute of McGill University Health Centre, Montréal, QC, Canada
| | - William Klement
- Centre for Outcomes Research and Evaluation (CORE), Research Institute of McGill University Health Centre, Montréal, QC, Canada.,Canadian Blood Services, Ottawa, Ontario, Canada
| | - Claude Daniel
- Division of Hematology, McGill University Health Centre, Montréal, QC, Canada
| | - Ruth Sapir-Pichhadze
- Centre for Outcomes Research and Evaluation (CORE), Research Institute of McGill University Health Centre, Montréal, QC, Canada.,Division of Nephrology and the Multi-Organ Transplant Program, Royal Victoria Hospital, McGill University Health Centre, Montréal, QC, Canada.,Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, QC, Canada
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16
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Car H, Karahan GE, Dreyer GJ, Brand-Schaaf SH, de Vries APJ, van Kooten C, Kramer CSM, Roelen DL, Claas FHJ, Heidt S. Low incidence of IgA isotype of HLA antibodies in alloantigen exposed individuals. HLA 2020; 97:101-111. [PMID: 33227174 PMCID: PMC7898292 DOI: 10.1111/tan.14146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/30/2020] [Accepted: 11/09/2020] [Indexed: 11/30/2022]
Abstract
Human leukocyte antigen (HLA) antibodies are induced by pregnancy, transfusion, or transplantation. Serum from transplant recipients is regularly screened for IgG HLA antibodies because of their clinical relevance for transplant outcome. While other isotypes of HLA antibodies, such as IgA may also contribute to the alloimmune response, validated detection assays for IgA HLA antibody detection are lacking. Therefore, we modified the commonly used luminex screening assay for IgG HLA antibody detection (IgG-LMX) into an IgA HLA antibody screening assay (IgA-LMX). Optimization and validation was performed with IgG, IgA1, and IgA2 isotype variants of HLA-specific human recombinant monoclonal antibodies (mAbs). Reactivity patterns of IgA1 and IgA2 isotype HLA-specific mAbs in IgA-LMX were identical to those of the IgG isotype. Cross-reactivity with IgG and IgM antibodies and nonspecific binding to the beads were excluded. Further assay validation showed the absence of IgA HLA antibodies in serum from individuals without alloantigen exposure (n = 18). When the IgA-LMX assay was applied to sera from 289 individuals with known alloantigen exposure through pregnancy (n = 91) or kidney transplantation (n = 198), IgA HLA antibodies were detected in 3.5% of individuals; eight patients on the kidney retransplant waitlist and two women immunized through pregnancy. The majority (90%) of IgA HLA antibodies were directed against HLA class II and were always present in conjunction with IgG HLA antibodies. Results of this study show that this validated IgA-LMX method can serve as a screening assay for IgA HLA antibodies and that the incidence of IgA HLA antibodies in alloantigen exposed individuals is low.
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Affiliation(s)
- Helena Car
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Gonca E Karahan
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands.,Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands
| | - Geertje J Dreyer
- Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands.,Department of Nephrology, Leiden University Medical Center, Leiden, The Netherlands
| | - Simone H Brand-Schaaf
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands.,Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands
| | - Aiko P J de Vries
- Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands.,Department of Nephrology, Leiden University Medical Center, Leiden, The Netherlands
| | - Cees van Kooten
- Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands.,Department of Nephrology, Leiden University Medical Center, Leiden, The Netherlands
| | - Cynthia S M Kramer
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Dave L Roelen
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands.,Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands
| | - Frans H J Claas
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Sebastiaan Heidt
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands.,Leiden Transplant Center, Leiden University Medical Center, Leiden, The Netherlands
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17
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Heidt S, Haasnoot GW, Witvliet MD, van der Linden‐van Oevelen MJH, Kamburova EG, Wisse BW, Joosten I, Allebes WA, van der Meer A, Hilbrands LB, Baas MC, Spierings E, Hack CE, van Reekum FE, van Zuilen AD, Verhaar MC, Bots ML, Drop ACAD, Plaisier L, Seelen MAJ, Sanders J, Hepkema BG, Lambeck AJA, Bungener LB, Roozendaal C, Tilanus MGJ, Voorter CE, Wieten L, van Duijnhoven EM, Gelens MA, Christiaans MHL, van Ittersum FJ, Nurmohamed SA, Lardy NM, Swelsen W, van der Pant KAMI, van der Weerd NC, ten Berge IJM, Bemelman FJ, Hoitsma A, van der Boog PJM, de Fijter JW, Betjes MGH, Otten HG, Roelen DL, Claas FHJ. Allocation to highly sensitized patients based on acceptable mismatches results in low rejection rates comparable to nonsensitized patients. Am J Transplant 2019; 19:2926-2933. [PMID: 31155833 PMCID: PMC6790659 DOI: 10.1111/ajt.15486] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 05/04/2019] [Accepted: 05/08/2019] [Indexed: 01/25/2023]
Abstract
Whereas regular allocation avoids unacceptable mismatches on the donor organ, allocation to highly sensitized patients within the Eurotransplant Acceptable Mismatch (AM) program is based on the patient's HLA phenotype plus acceptable antigens. These are HLA antigens to which the patient never made antibodies, as determined by extensive laboratory testing. AM patients have superior long-term graft survival compared with highly sensitized patients in regular allocation. Here, we questioned whether the AM program also results in lower rejection rates. From the PROCARE cohort, consisting of all Dutch kidney transplants in 1995-2005, we selected deceased donor single transplants with a minimum of 1 HLA mismatch and determined the cumulative 6-month rejection incidence for patients in AM or regular allocation. Additionally, we determined the effect of minimal matching criteria of 1 HLA-B plus 1 HLA-DR, or 2 HLA-DR antigens on rejection incidence. AM patients showed significantly lower rejection rates than highly immunized patients in regular allocation, comparable to nonsensitized patients, independent of other risk factors for rejection. In contrast to highly sensitized patients in regular allocation, minimal matching criteria did not affect rejection rates in AM patients. Allocation based on acceptable antigens leads to relatively low-risk transplants for highly sensitized patients with rejection rates similar to those of nonimmunized individuals.
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18
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Sinangil A, Ucar ZA, Koc Y, Barlas S, Abouzahir S, Ecder ST, Akin EB. Outcome of Desensitization Therapy in Immunologically High-Risk Kidney Transplantation: Single-Center Experience. Transplant Proc 2019; 51:2268-2273. [PMID: 31358450 DOI: 10.1016/j.transproceed.2019.04.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/29/2019] [Accepted: 04/11/2019] [Indexed: 10/26/2022]
Abstract
AIM Sensitization to HLA antigens creates an immunologic barrier, linked to an increased risk of antibody-mediated rejection and poorer graft survival, that remains a persistent and often impenetrable deterrent to transplantation. Desensitization can improve transplantation rates in broadly sensitized kidney transplant recipients. We aimed to compare the clinical outcomes of immunologic high-risk kidney recipients who had desensitization treatment with the outcomes of those who did not. MATERIALS AND METHODS We retrospectively evaluated patients who underwent desensitization protocol due to immunologic risk between 2010 and 2018. Living-donor transplantation patients with panel reactive antibody positivity, retransplantation, donor specific antibody, and/or single antigen bead positivity were included in the study. We excluded deceased-donor transplantation recipients. Demographic data (age, sex, etiology of end-stage renal disease, blood transfusions, pregnancy, etc), immunologic status (HLA-mismatch [HLA-MM], panel reactive antibody, donor specific antibody, etc), induction and maintenance of immunosuppressive medications, and complications (all-cause hospitalizations, episodes of acute rejections, etc) were noted. We compared data and clinical outcomes of patients who had desensitization (Group 1) with data and clinical outcomes of patients who had not had desensitization (Group 2). FINDINGS There were 124 living-kidney donors (49 female, mean age 43.7 ± 12.2 years, mean body mass index [BMI] 25.8 ± 5.8 kg/m2, mean follow-up time 20.9 ± 14.6 months). Thirty-four of these patients (25 female, mean age 43.7 ± 12.5 years, mean follow-up time 26.1 ± 17.7 months, mean BMI 27 ± 6.5 kg/m2) had desensitization treatment (rituximab+plasmapheresis for 19 patients, rituximab for 11 patients, rituximab+plasmapheresis+intravenous immunoglobulin for 4 patients). Ninety patients (24 female, mean age 43.7 ± 12.2 years, mean follow-up time 18.9 ± 12.9 months, mean BMI 25.3 ± 5.4 kg/m2) had not had desensitization. There was no statistical difference between groups for age, sex, hepatitis serology, history of blood transfusion, history of pregnancy, or history of dialysis (P < .05 for all parameters). While scores for HLA-MM and HLA-relative intensity scale (RIS) were 2.7 ± 1.6 and 7.86 ± 6.2, respectively, in Group 1, in Group 2 the same scores were 2.1 ± 1.1 and 3.6 ± 2.5, respectively (P: .053 and .03). Delayed graft function, acute rejection episodes, and hospitalizations were similar between groups (P: .47, .29, and .34, respectively). Follow-up time and length of hospitalization were longer in Group 1 (P: .013 and .001, respectively). Total doses of ATG were higher in Group 1 patients (P: .007). CONCLUSION Despite the higher HLA-MM and RIS scores, clinical outcomes in desensitized patients were found to be similar to those in nondesensitized patients for acute rejection episodes and hospitalizations. Desensitization with rituximab in patients with high HLA-RIS scores can prevent acute rejection and hospitalization.
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Affiliation(s)
- Ayse Sinangil
- Division of Nephrology, Department of Internal Medicine, Istanbul Bilim University Medical Faculty, Istanbul, Turkey
| | - Zuhal Atan Ucar
- Division of Nephrology, Department of Internal Medicine, Istanbul Bilim University Medical Faculty, Istanbul, Turkey
| | - Yener Koc
- Division of Nephrology, Department of Internal Medicine, Istanbul Bilim University Medical Faculty, Istanbul, Turkey.
| | - Soykan Barlas
- Unit of Renal Transplantation, Department of General Surgery, Istanbul Bilim University Medical Faculty, Istanbul, Turkey
| | - Sana Abouzahir
- Division of Nephrology, Department of Internal Medicine, Istanbul Bilim University Medical Faculty, Istanbul, Turkey; Department of Nephrology, Cheikh Anta Diop University, Dakar, Senegal
| | - Suleyman Tevfik Ecder
- Division of Nephrology, Department of Internal Medicine, Istanbul Bilim University Medical Faculty, Istanbul, Turkey
| | - Emin Baris Akin
- Unit of Renal Transplantation, Department of General Surgery, Istanbul Bilim University Medical Faculty, Istanbul, Turkey
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Hundrieser J, Hein R, Pokoyski C, Brinkmann A, Düvel H, Dinkel A, Trautewig B, Siegert JF, Römermann D, Petersen B, Schwinzer R. Role of human and porcine MHC DRB1 alleles in determining the intensity of individual human anti-pig T-cell responses. Xenotransplantation 2019; 26:e12523. [PMID: 31074044 DOI: 10.1111/xen.12523] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/10/2019] [Accepted: 04/12/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Differences in quality and strength of immune responses between individuals are mainly due to polymorphisms in major histocompatibility complex (MHC) molecules. Focusing on MHC class-II, we asked whether the intensity of human anti-pig T-cell responses is influenced by genetic variability in the human HLA-DRB1 and/or the porcine SLA-DRB1 locus. METHODS ELISpot assays were performed using peripheral blood mononuclear cells (PBMCs) from 62 HLA-DRB1-typed blood donors as responder and the porcine B cell line L23 as stimulator cells. Based on the frequency of IFN-γ-secreting cells, groups of weak, medium, and strong responder individuals were defined. Mixed lymphocyte reaction (MLR) assays were performed to study the stimulatory capacity of porcine PBMCs expressing different SLA-DRB1 alleles. RESULTS Concerning the MHC class-II configuration of human cells, we found a significant overrepresentation of HLA-DRB1*01 alleles in the medium/strong responder group as compared to individuals showing weak responses to stimulation with L23 cells. Evaluation of the role of MHC class-II variability in porcine stimulators revealed that cells expressing SLA-DRB1*06 alleles triggered strong proliferation in approximately 70% of humans. Comparison of amino acid sequences indicated that strong human anti-pig reactivity may be associated with a high rate of similarity between human and pig HLA/SLA-DRB1 alleles. CONCLUSION Variability in human and porcine MHC determines the intensity of individual human anti-pig T-cell responses. MHC typing and cross-matching of prospective recipients of xenografts and donor pigs could be relevant to select for donor-recipient combinations with minimal anti-porcine immunity.
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Affiliation(s)
- Joachim Hundrieser
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Rabea Hein
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Claudia Pokoyski
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Antje Brinkmann
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Heike Düvel
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Astrid Dinkel
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Britta Trautewig
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Janina-Franziska Siegert
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Dorothee Römermann
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
| | - Björn Petersen
- Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Mariensee, Germany
| | - Reinhard Schwinzer
- Transplant Laboratory, Department of General-, Visceral-, and Transplantation Surgery, Hannover Medical School, Hannover, Germany
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