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Jabbour R, Heinzel A, Reindl-Schwaighofer R, Gregorich MG, Regele H, Kozakowski N, Kläger J, Fischer G, Kainz A, Becker JU, Wiebe C, Oberbauer R. Early progression of chronic histologic lesions in kidney transplant biopsies is not associated with HLA histocompatibility. Nephrol Dial Transplant 2024; 39:808-817. [PMID: 37960919 PMCID: PMC11181859 DOI: 10.1093/ndt/gfad246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Early progression of chronic histologic lesions in kidney allografts represents the main finding in graft attrition. The objective of this retrospective cohort study was to elucidate whether HLA histocompatibility is associated with progression of chronic histologic lesions in the first year post-transplant. Established associations of de novo donor-specific antibody (dnDSA) formation with HLA mismatch and microvascular inflammation (MVI) were calculated to allow for comparability with other study cohorts. METHODS We included 117 adult kidney transplant recipients, transplanted between 2016 and 2020 from predominantly deceased donors, who had surveillance biopsies at 3 and 12 months. Histologic lesion scores were assessed according to the Banff classification. HLA mismatch scores [i.e. eplet, predicted indirectly recognizable HLA-epitopes algorithm (PIRCHE-II), HLA epitope mismatch algorithm (HLA-EMMA), HLA whole antigen A/B/DR] were calculated for all transplant pairs. Formation of dnDSAs was quantified by single antigen beads. RESULTS More than one-third of patients exhibited a progression of chronic lesion scores by at least one Banff grade in tubular atrophy (ct), interstitial fibrosis (ci), arteriolar hyalinosis (ah) and inflammation in the area of interstitial fibrosis and tubular atrophy (i-IFTA) from the 3- to the 12-month biopsy. Multivariable proportional odds logistic regression models revealed no association of HLA mismatch scores with progression of histologic lesions, except for ah and especially HLA-EMMA DRB1 [odds ratio (OR) = 1.10, 95% confidence interval (CI) 1.03-1.18]. Furthermore, the established associations of dnDSA formation with HLA mismatch and MVI (OR = 5.31, 95% CI 1.19-22.57) could be confirmed in our cohort. CONCLUSIONS These data support the association of HLA mismatch and alloimmune response, while suggesting that other factors contribute to early progression of chronic histologic lesions.
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Affiliation(s)
- Rhea Jabbour
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Andreas Heinzel
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Roman Reindl-Schwaighofer
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Mariella G Gregorich
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
- Section for Clinical Biometrics, Center for Medical Statistics, Informatics and Intelligent Systems (CeMSIIS), Medical University of Vienna, Vienna, Austria
| | - Heinz Regele
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | | | - Johannes Kläger
- Department of Pathology, Medical University of Vienna, Vienna, Austria
| | - Gottfried Fischer
- Department of Blood Group Serology and Transfusion Medicine, Medical University of Vienna, Vienna, Austria
| | - Alexander Kainz
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Jan U Becker
- Institute of Pathology, University Hospital of Cologne, Cologne, Germany
| | - Chris Wiebe
- Department of Medicine, University of Manitoba, Winnipeg, Canada; Shared Health Services Manitoba, Canada; Department of Immunology, University of Manitoba, Winnipeg, Canada
| | - Rainer Oberbauer
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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D’Aragon F, Rousseau W, Breau R, Aminaei D, Ichai C, Boyd GJ, Burns KEA, Cardinal H, Carrier FM, Chassé M, Chaudhury P, Dhanani S, English SW, Frenette AJ, Hanna S, Knoll G, Lauzier F, Oczkowski S, Rochwerg B, Shamseddin K, Slessarev M, Treleaven D, Turgeon AF, Weiss MJ, Selzner M, Meade MO. Calcineurin Inhibition in Deceased Organ Donors: A Systematic Review and Meta-analysis of Preclinical Studies. Transplant Direct 2023; 9:e1519. [PMID: 37649790 PMCID: PMC10465100 DOI: 10.1097/txd.0000000000001519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/01/2023] [Accepted: 05/03/2023] [Indexed: 09/01/2023] Open
Abstract
Background Preconditioning deceased organ donors with calcineurin inhibitors (CNIs) may reduce ischemia-reperfusion injury to improve transplant outcomes. Methods We searched MEDLINE, EMBASE, Cochrane Library, and conference proceedings for animal models of organ donation and transplantation, comparing donor treatment with CNIs with either placebo or no intervention, and evaluating outcomes for organ transplantation. Reviewers independently screened and selected studies, abstracted data, and assessed the risk of bias and clinical relevance of included studies. Where possible, we pooled results using meta-analysis; otherwise, we summarized findings descriptively. Results Eighteen studies used various animals and a range of CNI agents and doses and evaluated their effects on a variety of transplant outcomes. The risk of bias and clinical applicability were poorly reported. Pooled analyses suggested benefit of CNI treatment on early graft function in renal transplants (3 studies; serum creatinine: ratio of means [RoM] 0.54; 95% confidence interval [CI], 0.34-0.86) but not for liver transplants (2 studies; serum alanine transaminase: RoM 0.61; 95% CI, 0.30-1.26; and serum aspartate aminotransferase: RoM 0.58; 95% CI, 0.26-1.31). We found no reduction in graft loss at 7 d (2 studies; risk ratio 0.54; 95% CI, 0.08-3.42). CNI treatment was associated with reduced transplant recipient levels of interleukin-6 (4 studies; RoM 0.36; 95% CI, 0.19-0.70), tumor necrosis factor-alpha (5 studies; RoM 0.36; 95% CI, 0.12-1.03), and cellular apoptosis (4 studies; RoM 0.30; 95% CI, 0.19-0.47). Conclusions Although this compendium of animal experiments suggests that donor preconditioning with CNIs may improve early kidney graft function, the limited ability to reproduce a true clinical environment in animal experiments and to assess for risk of bias in these experiments is a serious weakness that precludes current clinical application.
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Affiliation(s)
- Frédérick D’Aragon
- Department of Anesthesiology, Université de Sherbrooke, Sherbrooke, QC, Canada
- Centre de Recherche du Centre Hospitalier Universitaire de Sherbrooke, QC, Canada
| | - William Rousseau
- Faculty of Medicine and Health Sciences, Université de Sherbrooke, QC, Canada
| | - Ruth Breau
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Daniel Aminaei
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Carole Ichai
- Intensive Care Unit, University Hospital of Nice, Nice, France
| | - Gordon J. Boyd
- Division of Neurology, Department of Medicine, Queen’s University, Kingston, ON, Canada
- Department of Critical Care Medicine, Queen’s University, Kingston, ON, Canada
| | - Karen E. A. Burns
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
- Interdepartmental Division of Critical Care, University of Toronto, Toronto, ON, Canada
- Li Ka Shing Knowledge Institute, University Health Toronto—St. Michael’s Hospital, Toronto, ON, Canada
| | - Héloïse Cardinal
- Department of Nephrology, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - François-Martin Carrier
- Department of Anesthesiology, Université de Montréal, Montreal, QC, Canada
- Department of Critical Care, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Michaël Chassé
- Department of Critical Care, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Prosanto Chaudhury
- Department of Surgery and Oncology, McGill University, Montreal, QC, Canada
| | - Sonny Dhanani
- Division of Critical Care, Department of Pediatrics, Children’s Hospital of Eastern Ontario and University of Ottawa, Ottawa, ON, Canada
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Shane W. English
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
- Department of Medicine, University of Ottawa, Ottawa, ON, Canada
| | | | - Steven Hanna
- Faculty of Medicine and Health Sciences, Université de Sherbrooke, QC, Canada
| | - Gregory Knoll
- Ottawa Hospital Research Institute, Ottawa, ON, Canada
- Division of Nephrology, Department of Medicine, The Ottawa Hospital and University of Ottawa, Ottawa, ON, Canada
| | - François Lauzier
- Department of Medicine, Université Laval, Quebec City, QC, Canada
- Population Health and Optimal Health Practice Research Unit, CHU de Québec-Université Laval Research Center, Quebec City, QC, Canada
| | - Simon Oczkowski
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
- Division of Critical Care, Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Bram Rochwerg
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
- Division of Critical Care, Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Khaled Shamseddin
- Division of Nephrology, Department of Medicine, Queen’s University, Kingston, ON, Canada
| | - Marat Slessarev
- Division of Critical Care, Department of Medicine, Western University, London, ON, Canada
| | - Darin Treleaven
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Alexis F. Turgeon
- Population Health and Optimal Health Practice Research Unit, CHU de Québec-Université Laval Research Center, Quebec City, QC, Canada
- Departments of Anesthesiology and Critical Care Medicine, Université Laval, Quebec City, QC, Canada
| | - Matthew J. Weiss
- Population Health and Optimal Health Practice Research Unit, CHU de Québec-Université Laval Research Center, Quebec City, QC, Canada
- Transplant Québec, QC, Canada
| | - Markus Selzner
- Department of General Surgery, University of Toronto and Toronto General Hospital, University Health Network, Toronto, ON, Canada
- Multi-Organ Transplant Program, Toronto General Hospital, University Health Network, Toronto, ON, Canada
| | - Maureen O. Meade
- Department of Health Evidence and Impact, McMaster University, Hamilton, ON, Canada
- Division of Critical Care, Department of Medicine, McMaster University, Hamilton, ON, Canada
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Madill-Thomsen KS, Böhmig GA, Bromberg J, Einecke G, Eskandary F, Gupta G, Myslak M, Viklicky O, Perkowska-Ptasinska A, Solez K, Halloran PF. Relating Molecular T Cell-mediated Rejection Activity in Kidney Transplant Biopsies to Time and to Histologic Tubulitis and Atrophy-fibrosis. Transplantation 2023; 107:1102-1114. [PMID: 36575574 PMCID: PMC10125115 DOI: 10.1097/tp.0000000000004396] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/29/2022] [Accepted: 09/12/2022] [Indexed: 12/29/2022]
Abstract
BACKGROUND We studied the variation in molecular T cell-mediated rejection (TCMR) activity in kidney transplant indication biopsies and its relationship with histologic lesions (particularly tubulitis and atrophy-fibrosis) and time posttransplant. METHODS We examined 175 kidney transplant biopsies with molecular TCMR as defined by archetypal analysis in the INTERCOMEX study ( ClinicalTrials.gov #NCT01299168). TCMR activity was defined by a molecular classifier. RESULTS Archetypal analysis identified 2 TCMR classes, TCMR1 and TCMR2: TCMR1 had higher TCMR activity and more antibody-mediated rejection ("mixed") activity and arteritis but little hyalinosis, whereas TCMR2 had less TCMR activity but more atrophy-fibrosis. TCMR1 and TCMR2 had similar levels of molecular injury and tubulitis. Both TCMR1 and TCMR2 biopsies were uncommon after 2 y posttransplant and were rare after 10 y, particularly TCMR1. Within late TCMR biopsies, TCMR classifier activity and activity molecules such as IFNG fell progressively with time, but tubulitis and molecular injury were sustained. Atrophy-fibrosis was increased in TCMR biopsies, even in the first year posttransplant, and rose with time posttransplant. TCMR1 and TCMR2 both reduced graft survival, but in random forests, the strongest determinant of survival after biopsies with TCMR was molecular injury, not TCMR activity. CONCLUSIONS TCMR varies in intensity but is always strongly related to molecular injury and atrophy-fibrosis, which ultimately explains its effect on survival. We hypothesize, based on the reciprocal relationship with hyalinosis, that the TCMR1-TCMR2 gradient reflects calcineurin inhibitor drug underexposure, whereas the time-dependent decline in TCMR activity and frequency after the first year reflects T-cell exhaustion.
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Affiliation(s)
| | - Georg A. Böhmig
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | | | - Gunilla Einecke
- Department of Nephrology, Hannover Medical School, Hannover, Germany
| | - Farsad Eskandary
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Gaurav Gupta
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA
| | - Marek Myslak
- Department of Clinical Interventions, Department of Nephrology and Kidney Transplantation SPWSZ Hospital, Pomeranian Medical University, Szczecin, Poland
| | - Ondrej Viklicky
- Department of Nephrology and Transplant Center, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | | | - Kim Solez
- Department of Laboratory Medicine and Pathology, Division of Anatomical Pathology, University of Alberta, Edmonton, Canada
| | - Philip F. Halloran
- Alberta Transplant Applied Genomics Centre, Edmonton, AB, Canada
- Division of Nephrology and Transplant Immunology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
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4
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Karolin A, Escher G, Rudloff S, Sidler D. Nephrotoxicity of Calcineurin Inhibitors in Kidney Epithelial Cells is Independent of NFAT Signaling. Front Pharmacol 2022; 12:789080. [PMID: 35140605 PMCID: PMC8819135 DOI: 10.3389/fphar.2021.789080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/29/2021] [Indexed: 01/01/2023] Open
Abstract
Background: Calcineurin inhibitors (CNIs) such as cyclosporine A and tacrolimus are commonly used after renal transplantation to suppress the immune system. In lymphoid cells, cyclosporine A acts via the calcineurin/nuclear factor of activated T-cell (NFAT) axis. In non-lymphoid cells, such as kidney epithelial cells, cyclosporine A induces calcineurin inhibitor toxicity. It is unknown via which off-targets cyclosporine A induces calcineurin inhibitor toxicity in kidney epithelial cells. Methods: To measure a compound’s potential to induce nephrotoxicity, the expression of the surrogate marker Fn14 was measured by flow cytometry. Compounds were tested for their potential to induce Fn14 either chemically or plasmid-mediated. Mice were injected with various compounds, and changes in nephrotoxic gene expression levels of the kidney epithelial cells were then analyzed. Results: Fn14 is specifically upregulated due to calcineurin inhibitor toxicity inducing agents. Inhibition of the NFAT axis showed no increase of the Fn14 expression on the surface of kidney cells. However, inhibition of p38 MAPK, phosphoinositide-3-kinase (PI3K)/Akt, protein kinase C (PKC), and inhibitor of nuclear factor-κB (IκB) kinase (IKK) showed clear induction of Fn14 and increased expressions of nephrotoxic, inflammatory, and fibrotic genes in vitro and in vivo. Conclusions: These findings show that cyclosporine A acts independently of NFAT on kidney epithelial cells. Moreover, inhibition of serine/threonine protein kinases mimics cyclosporine A’s activity on kidney epithelial cells. This mimicking effect indicates that these protein kinases are off-targets of cyclosporine A and damage structural renal cells when inhibited and therefore contributes likely to the development and progression of calcineurin inhibitor toxicity.
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Affiliation(s)
- Andrea Karolin
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Geneviève Escher
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
| | - Stefan Rudloff
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
| | - Daniel Sidler
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
- *Correspondence: Daniel Sidler,
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5
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Halloran PF, Einecke G, Sikosana MLN, Madill-Thomsen K. The Biology and Molecular Basis of Organ Transplant Rejection. Handb Exp Pharmacol 2022; 272:1-26. [PMID: 35091823 DOI: 10.1007/164_2021_557] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Allograft rejection is defined as tissue injury in a transplanted allogeneic organ produced by the effector mechanisms of the adaptive alloimmune response. Effector T lymphocytes and IgG alloantibodies cause two different types of rejection that can occur either individually or simultaneously: T cell-mediated rejection (TCMR) and antibody-mediated rejection (ABMR). In TCMR, cognate effector T cells infiltrate the graft and orchestrate an interstitial inflammatory response in the kidney interstitium in which effector T cells engage antigen-presenting myeloid cells, activating the T cells, antigen-presenting cells, and macrophages. The result is intense expression of IFNG and IFNG-induced molecules, expression of effector T cell molecules and macrophage molecules and checkpoints, and deterioration of parenchymal function. The diagnostic lesions of TCMR follow, i.e. interstitial inflammation, parenchymal deterioration, and intimal arteritis. In ABMR, HLA IgG alloantibodies produced by plasma cells bind to the donor antigens on graft microcirculation, leading to complement activation, margination, and activation of NK cells and neutrophils and monocytes, and endothelial injury, sometimes with intimal arteritis. TCMR becomes infrequent after 5-10 years post-transplant, probably reflecting adaptive mechanisms such as checkpoints, but ABMR can present even decades post-transplant. Some rejection is triggered by inadequate immunosuppression and non-adherence, challenging the clinician to target effective immunosuppression even decades post-transplant.
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Affiliation(s)
- Philip F Halloran
- Division of Nephrology, Department of Medicine, University of Alberta, Edmonton, AB, Canada.
| | - Gunilla Einecke
- Department of Nephrology and Hypertension, Hannover Medical School, Hannover, Germany
| | - Majid L N Sikosana
- Division of Nephrology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
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6
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Deinsberger J, Felhofer M, Kläger JP, Petzelbauer P, Gierlinger N, Weber B. Raman spectroscopy reveals collagen and phospholipids as major components of hyalinosis in the arteriolosclerotic ulcer of Martorell. J Eur Acad Dermatol Venereol 2021; 35:2308-2316. [PMID: 34331822 DOI: 10.1111/jdv.17573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 07/21/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Arteriolosclerotic ulcers of Martorell are histologically characterized by hyaline arteriolosclerosis resulting in concentric occlusion of the arteriolar lumina. Although several authors have previously reported on hyaline changes in hypertensive arteriolopathies, so far, little information is available on the molecular composition of hyaline wall depositions. OBJECTIVES This study aimed at the molecular characterization of hyaline arteriolar deposits in patients with hypertensive arteriolopathy using confocal Raman spectroscopy. METHODS Samples of patients diagnosed with arteriolosclerotic ulcers of Martorell were analysed using confocal Raman spectroscopy. The findings were correlated with histological analyses. Skin samples from healthy, non-hypertensive patients served as controls. RESULTS Confocal Raman spectroscopy analysis revealed that subendothelial hyaline deposits in arteriolosclerotic ulcers are mainly composed of collagen and phospholipids, in particular phosphatidylcholine. The presence of collagen within hyaline deposits was confirmed by Masson's Trichrome and Picrosirius Red staining. Additionally, the presence of collagen could also be shown for hypertensive nephrosclerosis. Actin was markedly decreased in hyalinized compared to control vessels, corresponding to the loss of smooth muscle cells in the process of hyalinization. This was confirmed by immunofluorescence staining for α-smooth muscle actin and desmin. CONCLUSION The present findings suggest that arteriolar hyaline deposits in hypertensive arteriolopathy are mainly composed of collagen and phospholipids, in particular phosphatidylcholine. Together with the concurrent absence of actin, these findings suggest that potentially critical disease mechanisms involve pressure-induced vascular smooth muscle cell apoptosis with subsequent deposition of collagen.
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Affiliation(s)
- J Deinsberger
- Skin and Endothelium Research Division (SERD), Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Department of Dermatology, Vienna General Hospital, Medical University of Vienna, Vienna, Austria
| | - M Felhofer
- Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna (BOKU), Vienna, Austria
| | - J P Kläger
- Department of Pathology, Vienna General Hospital, Medical University of Vienna, Vienna, Austria
| | - P Petzelbauer
- Skin and Endothelium Research Division (SERD), Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Department of Dermatology, Vienna General Hospital, Medical University of Vienna, Vienna, Austria
| | - N Gierlinger
- Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna (BOKU), Vienna, Austria
| | - B Weber
- Skin and Endothelium Research Division (SERD), Department of Dermatology, Medical University of Vienna, Vienna, Austria.,Department of Dermatology, Vienna General Hospital, Medical University of Vienna, Vienna, Austria
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7
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Karolin A, Genitsch V, Sidler D. Calcineurin Inhibitor Toxicity in Solid Organ Transplantation. Pharmacology 2021; 106:347-355. [PMID: 34130291 DOI: 10.1159/000515933] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/16/2021] [Indexed: 11/19/2022]
Abstract
Calcineurin inhibitors (CNIs) have a substantial role in maintaining immunosuppression after solid organ transplantation (SOT). These drugs have a narrow therapeutic window, and individual doses and drug treatment monitoring are necessary. Still, a substantial proportion of patients suffer from short- or long-term calcineurin inhibitor toxicity (CNT), including kidney function impairment, hypertension, neurotoxicity, and metabolic disturbances. The authors discuss pathophysiology, clinical presentation, and histological features of CNT, with focus on renal manifestations. Furthermore, we elucidate recent and ongoing attempts to reduce the burden of CNT in SOT including CNI-sparing and CNI-free regimens.
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Affiliation(s)
- Andrea Karolin
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
| | - Vera Genitsch
- Institute for Pathology, University of Bern, Bern, Switzerland
| | - Daniel Sidler
- Department for Nephrology and Hypertension, University Hospital Insel Bern, Bern, Switzerland
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8
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Krejčí K, Tichý T, Bednaříková J, Bartková M, Žamboch K, Orság J, Zadražil J. Nephrotoxicity of calcineurin inhibitors as a risk factor for BK polyomavirus replication after kidney transplantation. J Med Virol 2021; 93:3871-3879. [PMID: 32940913 DOI: 10.1002/jmv.26520] [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: 06/04/2020] [Revised: 09/04/2020] [Accepted: 09/14/2020] [Indexed: 11/11/2022]
Abstract
BK polyomavirus-associated nephropathy (PyVAN) is responsible for a significant percentage of transplanted kidneys prematurely terminating their function. Its occurrence is closely related to the intensity of immunosuppressive therapy. In a group of 161 newly transplanted patients, we prospectively evaluated 457 protocol renal biopsies performed within the first year after transplantation. Using the calcineurin inhibitors (CI) nephrotoxicity score, the incidence of nephrotoxicity was monitored as a manifestation of excessive immunosuppression. Findings were correlated with clinical evidence of active BK polyomavirus (BKPyV) replication and PyVAN. Compared to the normal histology, nephrotoxicity was associated with more frequent BKPyV viremia and viruria (p = .01 and p < .01, respectively) and more common occurrence of PyVAN. The persistence of toxicity in the subsequent biopsy proved to be a negative risk factor of viremia and viruria (p = .03 and p < .01, respectively), independently of the initial BKPyV status. Toxicity could also be used as a predictor of viremia and viruria (p = .04 and p < .01, respectively) even in the absence of viral replication at the time of initial biopsy. The early histological manifestation of CI nephrotoxicity was associated with significant BKPyV reactivation in the risky first posttransplant year.
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Affiliation(s)
- Karel Krejčí
- Department of Internal Medicine III - Nephrology, Rheumatology and Endocrinology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Tomáš Tichý
- Department of Clinical and Molecular Pathology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Jana Bednaříková
- Department of Clinical Biochemistry, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Margita Bartková
- Department of Microbiology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Kamil Žamboch
- Department of Internal Medicine III - Nephrology, Rheumatology and Endocrinology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Jiří Orság
- Department of Internal Medicine III - Nephrology, Rheumatology and Endocrinology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
| | - Josef Zadražil
- Department of Internal Medicine III - Nephrology, Rheumatology and Endocrinology, Faculty of Medicine and Dentistry, University Hospital, Palacký University Olomouc, Olomouc, Czech Republic
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9
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Abstract
Tacrolimus was discovered in 1984 and entered clinical use shortly thereafter, contributing to successful solid organ transplantation across the globe. In this review, we cover development of tacrolimus, its evolving clinical utility, and issues affecting its current usage. Since earliest use of this class of immunosuppressant, concerns for calcineurin-inhibitor toxicity have led to efforts to minimize or eliminate these agents in clinical regimens but with limited success. Current understanding of the role of tacrolimus focuses more on its efficacy in preventing graft rejection and graft loss. As we enter the fourth decade of tacrolimus use, newer studies utilizing novel combinations (as with the mammalian target of rapamycin inhibitor, everolimus, and T-cell costimulation blockade with belatacept) offer potential for enhanced benefits.
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Affiliation(s)
- Song C Ong
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL
| | - Robert S Gaston
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL
- CTI Clinical Trial and Consulting, Inc., Covington, KT
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10
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Clinical Relevance of Arteriolar C4d Staining in Patients With Chronic-active Antibody-mediated Rejection: A Pilot Study. Transplantation 2020; 104:1085-1094. [PMID: 31517782 DOI: 10.1097/tp.0000000000002957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND C4d staining in peritubular capillaries is a well-established feature of antibody-mediated rejection (AMR). The relevance of C4d staining outside peritubular capillaries is not well understood. We investigated the significance of arteriolar C4d staining in chronic-active AMR (c-aAMR). METHODS All for-cause renal allograft biopsies performed in 2007-2014 at the Erasmus MC and meeting the criteria for suspicious/diagnostic c-aAMR using the Banff Classification 2015 were included. For comparison, renal allograft biopsies from a matched control group and native renal biopsies were analyzed. Arteriolar C4d staining was semiquantitatively scored as negative (0), small deposits in 1 arteriole (1+), small/large deposits in >1 arterioles (2+), or at least extensive deposits in most arterioles (3+). RESULTS Thirty-four of 40 (85%) patients with c-aAMR showed arteriolar C4d staining. A significant difference in arteriolar C4d score was observed between cases and matched controls (P = 0.01) and a trend toward significance difference between cases and native renal biopsies (P = 0.05). In the cases, arteriolar C4d staining was significantly associated with severity of arteriolar hyalinosis (P = 0.004) and ≥2 arteriolar C4d staining was independently associated with better graft outcome in a multivariate Cox regression analysis (hazard ratio, 0.260; 95% CI, 0.104-0.650; P = 0.004). CONCLUSIONS This pilot study shows that arteriolar C4d staining is more common in biopsies with c-aAMR compared with those without and that it is associated with arteriolar hyalinosis and ≥2 arteriolar C4d staining is associated with superior graft outcome. However, larger studies are needed to examine these findings in more detail to asses if arteriolar C4d staining is truly related to antibody-mediated injury.
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11
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Gupta G, Raynaud M, Kumar D, Sanghi P, Chang J, Kimball P, Kang L, Levy M, Sharma A, Bhati CS, Kamal L, Yakubu I, Massey HD, Kidd C, King AL, Halloran PF. Impact of belatacept conversion on kidney transplant function, histology, and gene expression - a single-center study. Transpl Int 2020; 33:1458-1471. [PMID: 32790889 DOI: 10.1111/tri.13718] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/28/2020] [Accepted: 08/07/2020] [Indexed: 11/28/2022]
Abstract
Prior studies on belatacept conversion from calcineurin inhibitor (CNI) have been limited by an absence of postconversion surveillance biopsies that could underestimate subclinical rejection, or a case-controlled design. A total of 53 adult patients with allograft dysfunction underwent belatacept conversion (median: 6 months) post-transplant. At a median follow-up = 2.5 years, patient survival was 94% with a death-censored graft survival of 85%. Seven (13%) patients had acute rejection (including 3 subclinical) at median 6 months postconversion. Overall, eGFR improved (P = <0.001) from baseline = 31±15 to 40.2 ± 17.6 ml/min/1.73m2 by 6 months postconversion, but then stayed stable. This improvement was also observed (P < 0.001) in comparison with a propensity matched control cohort on CNI, where eGFR stayed stable (mean ~ 32ml/min/1.72m2 ) over 2-year follow-up. Patients converted < 6 months post-transplant were more likely to have a long-term improvement in kidney function. Paired gene expression analysis of 30 (of 53) consecutive pre- and postconversion surveillance biopsies did not reveal changes in inflammation/acute injury; although atrophy-fibrosis score worsened (mean = 0.28 to 0.44; P = 0.005). Thus, improvement in renal function with belatacept conversion occurred early and then sustained in comparison with controls where renal function remained unchanged overtime. We were unable to show molecular signals that could be related to CNI administration and regressed after withdrawal.
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Affiliation(s)
- Gaurav Gupta
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA, USA
| | | | - Dhiren Kumar
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA, USA
| | - Pooja Sanghi
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA, USA
| | - Jessica Chang
- Alberta Transplant Applied Genomics Center, Edmonton, AB, Canada
| | - Pam Kimball
- Division of Transplant Surgery, Virginia Commonwealth University, Richmond, VA, USA
| | - Le Kang
- Department of Biostatistics, Virginia Commonwealth University, Richmond, VA, USA
| | - Marlon Levy
- Division of Transplant Surgery, Virginia Commonwealth University, Richmond, VA, USA
| | - Amit Sharma
- Division of Transplant Surgery, Virginia Commonwealth University, Richmond, VA, USA
| | - Chandra S Bhati
- Division of Transplant Surgery, Virginia Commonwealth University, Richmond, VA, USA
| | - Layla Kamal
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA, USA
| | - Idris Yakubu
- Division of Transplant Surgery, Virginia Commonwealth University, Richmond, VA, USA
| | - Hugh D Massey
- Department of Biostatistics, Virginia Commonwealth University, Richmond, VA, USA
| | - Chelsea Kidd
- Department of Pathology, Virginia Commonwealth University, Richmond, VA, USA
| | - Anne L King
- Division of Nephrology, Virginia Commonwealth University, Richmond, VA, USA
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12
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Conversion to Everolimus was Beneficial and Safe for Fast and Slow Tacrolimus Metabolizers After Renal Transplantation. J Clin Med 2020; 9:jcm9020328. [PMID: 31979381 PMCID: PMC7074544 DOI: 10.3390/jcm9020328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 01/14/2020] [Accepted: 01/20/2020] [Indexed: 12/17/2022] Open
Abstract
Fast tacrolimus (TAC) metabolism (concentration/dose (C/D) ratio <1.05 ng/mL/mg) is a risk factor for inferior outcomes after renal transplantation (RTx) as it fosters, e.g., TAC-related nephrotoxicity. TAC minimization or conversion to calcineurin-inhibitor free immunosuppression are strategies to improve graft function. Hence, we hypothesized that especially patients with a low C/D ratio profit from a switch to everolimus (EVR). We analyzed data of 34 RTx recipients (17 patients with a C/D ratio <1.05 ng/mL/mg vs. 17 patients with a C/D ratio ≥1.05 ng/mL/mg) who were converted to EVR within 24 months after RTx. The initial immunosuppression consisted of TAC, mycophenolate, prednisolone, and basiliximab induction. During an observation time of 36 months after changing immunosuppression from TAC to EVR, renal function, laboratory values, and adverse effects were compared between the groups. Fast TAC metabolizers were switched to EVR 4.6 (1.5–21.9) months and slow metabolizers 3.3 (1.8–23.0) months after RTx (p = 0.838). Estimated glomerular filtration rate (eGFR) did not differ between the groups at the time of conversion (baseline). Thereafter, the eGFR in all patients increased noticeably (fast metabolizers eGFR 36 months: + 11.0 ± 11.7 (p = 0.005); and slow metabolizers eGFR 36 months: + 9.4 ± 15.9 mL/min/1.73 m2 (p = 0.049)) vs. baseline. Adverse events were not different between the groups. After the switch, eGFR values of all patients increased statistically noticeably with a tendency towards a higher increase in fast TAC metabolizers. Since conversion to EVR was safe in a three-year follow-up for slow and fast TAC metabolizers, this could be an option to protect fast metabolizers from TAC-related issues.
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13
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Reindl-Schwaighofer R, Heinzel A, Gualdoni GA, Mesnard L, Claas FHJ, Oberbauer R. Novel insights into non-HLA alloimmunity in kidney transplantation. Transpl Int 2019; 33:5-17. [PMID: 31650645 PMCID: PMC6972536 DOI: 10.1111/tri.13546] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 08/26/2019] [Accepted: 10/23/2019] [Indexed: 12/14/2022]
Abstract
Recognition of non‐self structures on donor cells represents the main immunological barrier in solid organ transplantation. The human leukocyte antigens (HLA) are considered the most important non‐self (allo)antigens in transplantation. Long‐term graft attrition is mainly caused by the formation of alloreactive antibodies that are directed against non‐self structures (i.e., epitopes) on cell surface proteins. Recently published data provided evidence for a similar importance of non‐HLA mismatches between donors and recipients in acute rejection as well as long‐term kidney allograft survival. These data suggest a broader concept of immunological non‐self that goes beyond HLA incompatibility and expands the current concept of polymorphic non‐self epitopes on cell surface molecules from HLA to non‐HLA targets. Amino acid substitutions caused by single nucleotide variants in protein‐coding genes or complete loss of gene expression represent the basis for polymorphic residues in both HLA and non‐HLA molecules. To better understand these novel insights in non‐HLA alloimmunity, we will first review basic principles of the alloimmune response with a focus on the HLA epitope concept in donor‐specific antibody formation before discussing key publications on non‐HLA antibodies.
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Affiliation(s)
- Roman Reindl-Schwaighofer
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Andreas Heinzel
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Guido A Gualdoni
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Laurent Mesnard
- Sorbonne Université, Urgences Néphrologiques et Transplantation Rénale, Assistance Publique-Hôpitaux de Paris (APHP), Hôpital Tenon, Paris, France
| | - Frans H J Claas
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Centre, Leiden, The Netherlands
| | - Rainer Oberbauer
- Division of Nephrology and Dialysis, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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14
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Halloran PF, Matas A, Kasiske BL, Madill-Thomsen KS, Mackova M, Famulski KS. Molecular phenotype of kidney transplant indication biopsies with inflammation in scarred areas. Am J Transplant 2019; 19:1356-1370. [PMID: 30417539 DOI: 10.1111/ajt.15178] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/02/2018] [Accepted: 11/02/2018] [Indexed: 01/25/2023]
Abstract
In kidney transplant biopsies, inflammation in areas of atrophy-fibrosis (i-IFTA) is associated with increased risk of failure, presumably because inflammation is evoked by recent parenchymal injury from rejection or other insults, but some cases also have rejection. The present study explored the frequency of rejection in i-IFTA, by using histology Banff 2015 and a microarray-based molecular diagnostic system (MMDx). In unselected indication biopsies (108 i-IFTA, 73 uninflamed IFTA [i0-IFTA], and 53 no IFTA), i-IFTA biopsies occurred later, showed more scarring, and had more antibody-mediated rejection (ABMR) based on histology (28%) and MMDx (45%). T cell-mediated rejection (TCMR) was infrequent in i-IFTA based on histology (8%) and MMDx (16%). Twelve i-IFTA biopsies (11%) had molecular TCMR not diagnosed by histology, although 6 were called borderline and almost all had histologic TCMR lesions. The prominent feature of i-IFTA biopsies was molecular injury (eg, acute kidney injury [AKI] transcripts). In multivariate analysis of biopsies >1 year posttransplant, the strongest associations with graft loss were AKI transcripts and histologic atrophy-scarring; i-IFTA was not significant when molecular AKI was included. We conclude that i-IFTA in indication biopsies reflects recent/ongoing parenchymal injury, often with concomitant ABMR but few with TCMR. Thus, the application of Banff i-IFTA in the population of late biopsies needs to be reconsidered.
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Affiliation(s)
- Philip F Halloran
- Alberta Transplant Applied Genomics Centre, Edmonton, Alberta, Canada.,Division of Nephrology and Transplant Immunology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Arthur Matas
- Department of Surgery, University of Minnesota at Fairview, Minneapolis, Minnesota
| | | | - Katelynn S Madill-Thomsen
- Division of Nephrology and Transplant Immunology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Martina Mackova
- Alberta Transplant Applied Genomics Centre, Edmonton, Alberta, Canada
| | - Konrad S Famulski
- Alberta Transplant Applied Genomics Centre, Edmonton, Alberta, Canada
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15
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Yamakawa T, Kobayashi A, Yamamoto I, Kawaguchi T, Imasawa T, Aoyama H, Akutsu N, Maruyama M, Saigo K, Yokoo T, Kitamura H. Impact of primary diabetic nephropathy on arteriolar hyalinosis lesions in patients following kidney transplantation. Nephrology (Carlton) 2018; 23 Suppl 2:70-75. [PMID: 29968417 DOI: 10.1111/nep.13276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2018] [Indexed: 01/03/2023]
Abstract
AIM Arteriolar hyalinosis (AH) is a common lesion in allograft biopsies taken following kidney transplantation. Recent studies have shown that severe AH may predict transplant outcomes and provide information about previous exposure to certain drugs, such as calcineurin inhibitors (CNI). However, the incidence of AH as a direct result of diabetic nephropathy (DN) after kidney transplantation has not been fully evaluated. This study aimed to assess the impact of primary DN on the development of AH lesions in patients who underwent kidney transplantation. METHODS Eighty-three patients who underwent living-donor kidney transplantation between April 2005 and June 2015 were enrolled in this study. A total of 33 patients had DN prior to transplantation. Allograft biopsies were scored according to the Banff classification, and the relationship between the individual histological lesions and clinical baseline data was assessed. RESULTS At early biopsy (3-12 months), there were no differences in the rates of AH lesions between the DN group and the non-DN group (ah ≥ 1: 37% vs. 41.3%, P = 0.719; aah ≥ 1: 14.8% vs. 6.5%; P = 0.453). However, there were significant differences between the groups in biopsies taken more than 3 years after the transplant (ah ≥ 2: 83.3% vs. 36.8%, P = 0.013; aah ≥ 2: 66.7% vs. 21.1%, P = 0.011). Multivariable analysis showed that both the length of time after transplantation and the presence of DN were independent risk factors for ah ≥ 2 (odds ratio [OR]: 2.55, 95% confidence interval [CI]: 1.47-19.54, P = 0.011) and aah ≥ 2 (OR: 7.55, 95% CI: 1.49-38.33, P = 0.015). CONCLUSION This is the first report showing that the presence of primary DN disease contributes to the development of severe AH late in the course after kidney allografts.
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Affiliation(s)
- Takafumi Yamakawa
- Department of Pathology, Chiba-East Hospital, Chiba, Japan.,Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Akimitsu Kobayashi
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Izumi Yamamoto
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | | | | | | | - Naotake Akutsu
- Department of Surgery, Chiba-East Hospital, Chiba, Japan
| | | | - Kenichi Saigo
- Department of Surgery, Chiba-East Hospital, Chiba, Japan
| | - Takashi Yokoo
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
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16
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Egeland EJ, Reisaeter AV, Robertsen I, Midtvedt K, Strøm EH, Holdaas H, Hartmann A, Åsberg A. High tacrolimus clearance - a risk factor for development of interstitial fibrosis and tubular atrophy in the transplanted kidney: a retrospective single-center cohort study. Transpl Int 2018; 32:257-269. [PMID: 30252957 DOI: 10.1111/tri.13356] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 07/31/2018] [Accepted: 09/19/2018] [Indexed: 12/11/2022]
Abstract
Patients with high tacrolimus clearance are more likely to experience transient under-immunosuppression in case of a missed or delayed dose. We wanted to investigate the association between estimated tacrolimus clearance and development of graft interstitial fibrosis and tubular atrophy (IFTA) in kidney transplant recipients. Associations between estimated tacrolimus clearance [daily tacrolimus dose (mg)/trough concentration (μg/l)] and changes in IFTA biopsy scores from week 7 to 1-year post-transplantation were investigated. Data from 504 patients transplanted between 2009 and 2013 with paired protocol biopsies (7 weeks + 1-year post-transplant) were included. There were no differences in baseline biopsy scores (7 weeks) in patients with different estimated tacrolimus clearance. Increasing tacrolimus clearance was significantly associated with increased ci + ct score of ≥2 at 1 year, odds ratio of 1.67 (95% CI; 1.11-2.51). In patients without fibrosis (ci + ct ≤ 1) at 7 weeks (n = 233), increasing tacrolimus clearance was associated with development of de novo IFTA (i + t ≤ 1 and ci + ct ≥ 2) at 1 year, odds ratio of 2.01 (95% CI; 1.18-3.50) after adjusting for confounders. High tacrolimus clearance was significantly associated with development of IFTA the first year following renal transplantation.
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Affiliation(s)
| | - Anna Varberg Reisaeter
- Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
| | - Ida Robertsen
- School of Pharmacy, University of Oslo, Oslo, Norway
| | - Karsten Midtvedt
- Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
| | | | - Hallvard Holdaas
- Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
| | - Anders Hartmann
- Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
| | - Anders Åsberg
- School of Pharmacy, University of Oslo, Oslo, Norway.,Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
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17
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Aala A, Brennan DC. Transformation in Immunosuppression: Are We Ready for it? J Am Soc Nephrol 2018; 29:1791-1792. [PMID: 29884733 DOI: 10.1681/asn.2018050491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Amtul Aala
- Division of Nephrology, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Daniel C Brennan
- Division of Nephrology, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland
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18
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Pascual J, Berger SP, Witzke O, Tedesco H, Mulgaonkar S, Qazi Y, Chadban S, Oppenheimer F, Sommerer C, Oberbauer R, Watarai Y, Legendre C, Citterio F, Henry M, Srinivas TR, Luo WL, Marti A, Bernhardt P, Vincenti F. Everolimus with Reduced Calcineurin Inhibitor Exposure in Renal Transplantation. J Am Soc Nephrol 2018; 29:1979-1991. [PMID: 29752413 DOI: 10.1681/asn.2018010009] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/08/2018] [Indexed: 12/28/2022] Open
Abstract
Background Everolimus permits reduced calcineurin inhibitor (CNI) exposure, but the efficacy and safety outcomes of this treatment after kidney transplant require confirmation.Methods In a multicenter noninferiority trial, we randomized 2037 de novo kidney transplant recipients to receive, in combination with induction therapy and corticosteroids, everolimus with reduced-exposure CNI (everolimus arm) or mycophenolic acid (MPA) with standard-exposure CNI (MPA arm). The primary end point was treated biopsy-proven acute rejection or eGFR<50 ml/min per 1.73 m2 at post-transplant month 12 using a 10% noninferiority margin.Results In the intent-to-treat population (everolimus n=1022, MPA n=1015), the primary end point incidence was 48.2% (493) with everolimus and 45.1% (457) with MPA (difference 3.2%; 95% confidence interval, -1.3% to 7.6%). Similar between-treatment differences in incidence were observed in the subgroups of patients who received tacrolimus or cyclosporine. Treated biopsy-proven acute rejection, graft loss, or death at post-transplant month 12 occurred in 14.9% and 12.5% of patients treated with everolimus and MPA, respectively (difference 2.3%; 95% confidence interval, -1.7% to 6.4%). De novo donor-specific antibody incidence at 12 months and antibody-mediated rejection rate did not differ between arms. Cytomegalovirus (3.6% versus 13.3%) and BK virus infections (4.3% versus 8.0%) were less frequent in the everolimus arm than in the MPA arm. Overall, 23.0% and 11.9% of patients treated with everolimus and MPA, respectively, discontinued the study drug because of adverse events.Conclusions In kidney transplant recipients at mild-to-moderate immunologic risk, everolimus was noninferior to MPA for a binary composite end point assessing immunosuppressive efficacy and preservation of graft function.
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Affiliation(s)
- Julio Pascual
- Department of Nephrology, Hospital del Mar, Barcelona, Spain;
| | - Stefan P Berger
- Department of Nephrology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Oliver Witzke
- Department of Infectious Diseases and Department of Nephrology, University Hospital Essen, University Duisburg-Essen, Germany
| | - Helio Tedesco
- Nephrology Division, Hospital do Rim, Universidade Federal de São Paulo (UNIFESP), São Paulo, Brazil
| | - Shamkant Mulgaonkar
- Renal and Pancreas Division, St. Barnabas Medical Center, Livingston, New Jersey
| | - Yasir Qazi
- Division of Nephrology, Keck School of Medicine Renal Transplant Program, University of Southern California, Los Angeles, California
| | - Steven Chadban
- Department of Renal Medicine and Transplantation, Renal Medicine and Transplantation, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Federico Oppenheimer
- Department of Nephrology and Renal Transplantation, Renal Transplant Unit, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Claudia Sommerer
- Department of Nephrology, Heidelberg University Hospital, Heidelberg, Germany
| | - Rainer Oberbauer
- Department of Nephrology and Dialysis, University Clinic for Internal Medicine III, Medical University Vienna, Vienna, Austria
| | - Yoshihiko Watarai
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya-City, Aich, Japan
| | - Christophe Legendre
- Department of Kidney Transplantation, Adult Transplantation Service, Paris Descartes University and Necker Hospital, Paris, France
| | - Franco Citterio
- Department of Surgery, Renal Transplantation, Catholic University, Rome, Italy
| | - Mitchell Henry
- Department of Surgery, The Comprehensive Transplant Center, The Ohio State University, Wexner Medical Center, Columbus, Ohio
| | - Titte R Srinivas
- Division of Nephrology, Medical University of South Carolina, Mount Pleasant, South Carolina
| | - Wen-Lin Luo
- Department of Biometrics and Statistical Science, Novartis Pharmaceuticals, East Hanover, New Jersey
| | - AnaMaria Marti
- Department of Research and Development, Novartis Pharma AG, Basel, Switzerland; and
| | - Peter Bernhardt
- Department of Research and Development, Novartis Pharma AG, Basel, Switzerland; and
| | - Flavio Vincenti
- Department of Surgery, Kidney Transplant Service, University of California, San Francisco, California
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19
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Snanoudj R, Legendre C. Response to: "Renal allograft histology at 10 years after transplantation in the tacrolimus era: Evidence of pervasive chronic injury". Am J Transplant 2018; 18:1292. [PMID: 29194941 DOI: 10.1111/ajt.14612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Renaud Snanoudj
- Nephrology and Transplantation Department, Foch Hospital, Suresnes, France
| | - Christophe Legendre
- Nephrology and Transplantation Department, Necker Hospital, Paris, France.,University Sorbonne Paris Cité, Paris, France
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20
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Fatal Pneumococcus Sepsis after Treatment of Late Antibody-Mediated Kidney Graft Rejection. Case Rep Nephrol 2018; 2018:1415450. [PMID: 29682370 PMCID: PMC5851299 DOI: 10.1155/2018/1415450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 01/23/2018] [Indexed: 11/17/2022] Open
Abstract
Antibody-mediated rejection (ABMR) is a major cause of late renal allograft dysfunction and graft loss. Risks and benefits of treatment of late ABMR have not been evaluated in randomized clinical trials. We report on a 35-year-old patient with deterioration in renal function and progressive proteinuria 15 years after transplantation. Recurrent infections after a splenectomy following traumatic splenic rupture 3 years earlier had led to reduction of immunosuppression. Renal transplant biopsy showed glomerular double contours, 40% fibrosis/tubular atrophy, peritubular capillaritis, and positive C4d staining indicating chronic-active ABMR. ABMR treatment was initiated with steroids, plasmapheresis, and rituximab. Fourteen days later, she presented to the emergency department with fever, diarrhea, vomiting, and hypotension. Despite antibiotic treatment she deteriorated with progressive hypotension, capillary leak with pleural effusion, peripheral edema, and progressive respiratory insufficiency. She died due to septic shock five days after admission. Blood cultures showed Streptococcus pneumoniae, consistent with a diagnosis of overwhelming postsplenectomy infection syndrome, despite protective pneumococcus vaccination titers. We assume that the infection was caused by one of the strains not covered by the Pneumovax 23 vaccination. The increased immunosuppression with B cell depletion may have contributed to the overwhelming course of this infection.
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21
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Einecke G, Reeve J, Halloran PF. A molecular biopsy test based on arteriolar under-hyalinosis reflects increased probability of rejection related to under-immunosuppression. Am J Transplant 2018; 18:821-831. [PMID: 28985016 DOI: 10.1111/ajt.14532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 09/15/2017] [Accepted: 09/26/2017] [Indexed: 01/25/2023]
Abstract
Calcineurin inhibitor immunosuppressive drugs induce changes such as arteriolar hyalinosis (ah) in kidney transplants, raising the possibility that molecular changes in biopsies related to histologic ah can provide information about drug exposure. We hypothesized that molecular changes associated with less-than-expected hyalinosis might highlight a subpopulation of patients with under-immunosuppression/nonadherence at intermediate times of biopsy posttransplant (TxBx). Using gene expression data from 562 indication biopsies, we developed a molecular classifier for predicting the expected ah lesions (Mah ) at a particular TxBx. Mah -scores increased linearly with log(TxBx), but some biopsies had lower scores than expected for TxBx. The deviation of individual Mah -scores below the predicted regression line of Mah -scores vs TxBx is defined as "low hyalinosis index." Low hyalinosis indices were frequent in biopsies between 3 months and 3 years posttransplant, particularly among biopsies lacking histologic hyalinosis (ah0), and were associated with T cell-mediated rejection and a subset of recent-onset antibody-mediated rejection without glomerular double contours. In patients with medical records available for review, low hyalinosis indices were frequently associated with physician-recorded concerns about nonadherence (suspected or proven). We conclude that the Mah classifier and hyalinosis index identify indication biopsies with rejection for which the possibility of patient nonadherence should be considered.
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Affiliation(s)
- Gunilla Einecke
- Department of Nephrology, Hannover Medical School, Hannover, Germany
| | - Jeff Reeve
- Alberta Transplant Applied Genomics Centre Edmonton, Edmonton, AB, Canada
- Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Philip F Halloran
- Alberta Transplant Applied Genomics Centre Edmonton, Edmonton, AB, Canada
- Department of Medicine, Division of Nephrology and Transplant Immunology, University of Alberta, Edmonton, AB, Canada
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22
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Vazquez Martul E. [The pathology of renal transplants]. REVISTA ESPAÑOLA DE PATOLOGÍA : PUBLICACIÓN OFICIAL DE LA SOCIEDAD ESPAÑOLA DE ANATOMÍA PATOLÓGICA Y DE LA SOCIEDAD ESPAÑOLA DE CITOLOGÍA 2018; 51:110-123. [PMID: 29602372 DOI: 10.1016/j.patol.2017.10.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 10/01/2017] [Indexed: 11/15/2022]
Abstract
In order to make an objective assessment of the histopathology of a renal biopsy during a kidney transplant, all the various elements involved in the process must be understood. It is important to know the characteristics of the donor organ, especially if the donor is older than 65. The histopathological features of the donor biopsy, especially its vascular status, are often related to an initial poor function of the transplanted kidney. The T lymphocyte inflammatory response is characteristic in acute cellular rejection; the degree of tubulitis, together with the amount of affected parenchyme, are important factors. The proportion of cellular sub-populations, such as plasma cells and macrophages, is also important, as they can be related to antibody-mediated humoral rejection. Immunofluorescent or immunohistochemical studies are necessary to rule out C4d deposits or immunogloblulins. The presence of abundant deposits of C4d in tubular basement membranes supports a diagnosis of humoral rejection, as does the presence of capillaritis, glomerulitis which, together with vasculitis, are typical diagnostic findings in C4d negative cases. Interstitial fibrosis, tubular atrophy and glomerular sclerosis, although non-specific, imply a chronic phase. Transplant glomerulopathy and multilamination in more than 6 layers of the tubular and glomerular basement membranes are quasi-specific characteristics of chronic humoral rejection. Electron microscopy is essential to identify of these pathologies as well as to demonstrate the presence of other glomerular renal diseases.
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Affiliation(s)
- Eduardo Vazquez Martul
- Ex Jefe de Servicio de Anatomía Patológica, Hospital Universitario A Coruña (retirado), A Coruña, España; Ex profesor asociado de la Facultad de Medicina, Universidad de Santiago de Compostela, Santiago de Compostela, A Coruña, España; Miembro del Club de Nefropatología (Sociedad Española de Nefrología), España.
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23
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Malheiro J, Santos S, Tafulo S, Dias L, Martins LS, Fonseca I, Almeida M, Pedroso S, Beirão I, Castro-Henriques A, Cabrita A. Correlations between donor-specific antibodies and non-adherence with chronic active antibody-mediated rejection phenotypes and their impact on kidney graft survival. Hum Immunol 2018; 79:413-423. [PMID: 29577962 DOI: 10.1016/j.humimm.2018.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 03/20/2018] [Accepted: 03/21/2018] [Indexed: 11/30/2022]
Abstract
Chronic-active antibody-mediated rejection (CAABMR) is associated with poor kidney graft survival and has no clear effective treatment. Forty-one cases of CAABMR were detected in indication graft biopsies and evaluated according to current Banff classification. We investigated the impact of concurrent donor-specific antibodies (DSA) and their characteristics, together with non-adherence regarding immunosuppression on CAABMR histopathological phenotypes and prognosis. Twenty-four (59%) patients had detectable DSA at biopsy, with 15 of them being considered non-adherent. Graft function at biopsy was similar in DSA (+) and (-) patients. DSA (+) patients had significantly higher tubulointerstitial inflammation (i and ti) and acute humoral (g+ptc+v+C4d) composite score than DSA (-). DSA (+)/non-adherent cases presented additionally with increased microvascular inflammation (ptc and v), besides having a distinctively lower ah score. C1q DSA strength was higher (P = .046) in non-adherent patients and correlated closely with C4d score (P = .002). Lower graft function and ah score, higher proteinuria and ci + ct score, and, separately per each model, DSA (+) (HR = 2.446, P = .034), DSA (+)/non-adherent (HR = 3.657, P = .005) and DSA (+)/C1q (+) (HR = 4.831, P = .003) status were independent predictors of graft failure. CAABMR with concomitant DSA pose a higher risk of graft failure. Adherence should be evaluated, and histopathological phenotyping and DSA characterization may add critical information.
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Affiliation(s)
- Jorge Malheiro
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal.
| | - Sofia Santos
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal
| | - Sandra Tafulo
- Centro do Sangue e Transplantação do Porto, Portugal
| | - Leonídio Dias
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal
| | - La Salete Martins
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal
| | - Isabel Fonseca
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal
| | - Manuela Almeida
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal
| | - Sofia Pedroso
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal
| | - Idalina Beirão
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal
| | - António Castro-Henriques
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal; Unit for Multidisciplinary Investigation in Biomedicine (UMIB), Porto, Portugal
| | - António Cabrita
- Nephrology and Kidney Transplantation Department, Hospital de Santo António, Centro Hospitalar do Porto, Portugal
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24
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Leal R, Tsapepas D, Crew RJ, Dube GK, Ratner L, Batal I. Pathology of Calcineurin and Mammalian Target of Rapamycin Inhibitors in Kidney Transplantation. Kidney Int Rep 2018; 3:281-290. [PMID: 30276344 PMCID: PMC6161639 DOI: 10.1016/j.ekir.2017.10.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/15/2017] [Accepted: 10/23/2017] [Indexed: 12/26/2022] Open
Abstract
The recent evolution in immunosuppression therapy has led to significant improvement in short-term kidney allograft outcomes; however, this progress did not translate into similar improvement in long-term graft survival. The latter, at least in part, is likely to be attributed to immunosuppressant side effects. In this review, we focus on the histologic manifestations of calcineurin inhibitor and mammalian target of rapamycin inhibitor toxicity. We discuss the pathologic features attributed to such toxicity and allude to the lack of highly specific pathognomonic lesions. Finally, we highlight the importance of clinicopathologic correlation to achieve a meaningful pathologic interpretation.
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Affiliation(s)
- Rita Leal
- Department of Nephrology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
- Department of Pathology and Cell Biology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Demetra Tsapepas
- Department of Pharmacy, NewYork-Presbyterian Hospital, New York, New York, USA
| | - Russell J. Crew
- Department of Medicine, Division of Nephrology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Geoffrey K. Dube
- Department of Medicine, Division of Nephrology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Lloyd Ratner
- Department of Surgery, Division of Transplantation, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Ibrahim Batal
- Department of Pathology and Cell Biology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
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25
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Xia T, Zhu S, Wen Y, Gao S, Li M, Tao X, Zhang F, Chen W. Risk factors for calcineurin inhibitor nephrotoxicity after renal transplantation: a systematic review and meta-analysis. DRUG DESIGN DEVELOPMENT AND THERAPY 2018. [PMID: 29535503 PMCID: PMC5836651 DOI: 10.2147/dddt.s149340] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Background Nephrotoxicity of calcineurin inhibitors (CNIs) is the major concern for long-term allograft survival despite its predominant role in current immunosuppressive regime after renal transplantation. CNI nephrotoxicity is multifactorial with demographic, environmental, and pharmacogenetic flexibility, whereas studies indicating risk factors for CNI nephrotoxicity obtained incomplete or conflicting results. Methods A systematic review and meta-analysis of risk factors for CNI nephrotoxicity was performed on all retrieved studies through a comprehensive research of network database. Data were analyzed by Review Manager 5.2 with heterogeneity assessed using the Cochrane Q and I2 tests. CNI nephrotoxicity was primarily indicated with protocol biopsy or index-based clinical diagnosis, and the secondary outcome was defined as delayed graft function. Results Twelve observational studies containing a total of 2,849 cases were identified. Donor age (odds ratio [OR], 1.01; 95% CI, 1.01-1.03; p=0.02), recipient zero-time arteriosclerosis (OR, 1.44; 95% CI, 1.04-1.99; p=0.03), and CYP3A5*3/*3 genotype (OR, 2.80; 95% CI, 2.63-2.98; p=0.00) were confirmed as risk factors for CNI nephrotoxicity. Subgroup and sensitivity analysis claimed donor age as a significant contributor in Asian and Caucasian areas. Conclusion Older donor age, recipient zero-time arteriosclerosis, and CYP3A5*3/*3 genotype might add up the risk for CNI nephrotoxicity, which could be interpreted into a robust biomarker system.
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Affiliation(s)
- Tianyi Xia
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Sang Zhu
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Yan Wen
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Shouhong Gao
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Mingming Li
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Xia Tao
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Feng Zhang
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Wansheng Chen
- Department of Pharmacy, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
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26
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Van Loon E, Lerut E, Naesens M. The time dependency of renal allograft histology. Transpl Int 2017; 30:1081-1091. [DOI: 10.1111/tri.13042] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 07/05/2017] [Accepted: 08/21/2017] [Indexed: 01/27/2023]
Affiliation(s)
- Elisabet Van Loon
- Laboratory of Nephrology; Department of Microbiology and Immunology; KU Leuven; Leuven Belgium
- Department of Nephrology and Renal Transplantation; University Hospitals Leuven; Leuven Belgium
| | - Evelyne Lerut
- Translational Cell and Tissue Research; Department of Imaging and Pathology; KU Leuven; Leuven Belgium
- Department of Morphology and Molecular Pathology; University Hospitals Leuven; Leuven Belgium
| | - Maarten Naesens
- Laboratory of Nephrology; Department of Microbiology and Immunology; KU Leuven; Leuven Belgium
- Department of Nephrology and Renal Transplantation; University Hospitals Leuven; Leuven Belgium
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27
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Reeve J, Böhmig GA, Eskandary F, Einecke G, Lefaucheur C, Loupy A, Halloran PF. Assessing rejection-related disease in kidney transplant biopsies based on archetypal analysis of molecular phenotypes. JCI Insight 2017; 2:94197. [PMID: 28614805 DOI: 10.1172/jci.insight.94197] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 05/05/2017] [Indexed: 01/15/2023] Open
Abstract
Conventional histologic diagnosis of rejection in kidney transplants has limited repeatability due to its inherent requirement for subjective assessment of lesions, in a rule-based system that does not acknowledge diagnostic uncertainty. Molecular phenotyping affords opportunities for increased precision and improved disease classification to address the limitations of conventional histologic diagnostic systems and quantify levels of uncertainty. Microarray data from 1,208 kidney transplant biopsies were collected prospectively from 13 centers. Cross-validated classifier scores predicting the presence of antibody-mediated rejection (ABMR), T cell-mediated rejection (TCMR), and 5 related histologic lesions were generated using supervised machine learning methods. These scores were used as input for archetypal analysis, an unsupervised method similar to cluster analysis, to examine the distribution of molecular phenotypes related to rejection. Six archetypes were generated: no rejection, TCMR, 3 associated with ABMR (early-stage, fully developed, and late-stage), and mixed rejection (TCMR plus early-stage ABMR). Each biopsy was assigned 6 scores, one for each archetype, representing a probabilistic assessment of that biopsy based on its rejection-related molecular properties. Viewed as clusters, the archetypes were similar to existing histologic Banff categories, but there was 32% disagreement, much of it probably reflecting the "noise" in the current histologic assessment system. Graft survival was lowest for fully developed and late-stage ABMR, and it was better predicted by molecular archetype scores than histologic diagnoses. The results provide a system for precision molecular assessment of biopsies and a new standard for recalibrating conventional diagnostic systems.
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Affiliation(s)
- Jeff Reeve
- Alberta Transplant Applied Genomics Centre, Alberta, Canada.,Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada
| | - Georg A Böhmig
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Farsad Eskandary
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Gunilla Einecke
- Department of Nephrology, Medizinische Hochschule Hannover, Hannover, Germany
| | - Carmen Lefaucheur
- Paris Translational Research Center for Organ Transplantation, INSERM, UMR-S970, Paris, France.,Saint-Louis Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Alexandre Loupy
- Paris Translational Research Center for Organ Transplantation, INSERM, UMR-S970, Paris, France.,Necker Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Philip F Halloran
- Alberta Transplant Applied Genomics Centre, Alberta, Canada.,Department of Medicine, Division of Nephrology and Transplant Immunology, University of Alberta, Edmonton, Alberta, Canada
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