Articles tagged "Allorecognition"

2021 American Transplant Congress
K562 Cells Expressing HLA-A2 Stimulate Alloreactive CD8+ T Cells
A. B. Morris, E. Peek, A. Hadley, C. P. Larsen
Emory Transplant Center, Emory University, Atlanta, GA
*Purpose: T cell-mediated rejection is a significant factor that leads to graft damage and loss in transplant recipients. Due to the complexity of the TCR:pMHC…
2021 American Transplant Congress
Precision Medicine in Renal Transplantation: T-cell Repertoire Sequencing to Define Donor-specific Clones for Post-transplant Monitoring
K. R. Sherwood¹, P. Wong¹, F. Fenninger¹, V. Wu¹, J. Beckrud², D. P. Cina³, L. Allan², J. Lan², P. A. Keown²
¹University of British Columbia, Vancouver, BC, Canada, ²Vancouver General Hospital, Vancouver, BC, Canada, ³Urologic Sciences, Vancouver General Hospital, Vancouver, BC, Canada
*Purpose: Measuring donor-specific clonal responses offers a precise, sensitive and specific biomarker of immune recognition and activation. Combining deep immunophenotyping (DI) and T-cell receptor (TCR)…
2020 American Transplant Congress
A Bioinformatics Pipeline for the Identification of Crucial Factors for Transplant Rejection Based on NGS Data
J. Vetter¹, A. Heinzel², C. Aschauer², R. Reindl-Schwaighofer², K. Jelencsics², K. Hu², R. Oberbauer², S. Winkler¹, S. Schaller¹
¹Bioinformatics Research Group, University of Applied Sciences Upper Austria, Hagenberg Campus, Hagenberg im Muehlkreis, Austria, ²Department of Nephrology and Dialysis, Medical University Vienna, Vienna, Austria
*Purpose: T and B cells are crucial parts of the human immune system and play an important role in transplantation. Since the mechanisms leading to…
2020 American Transplant Congress
CD56^DimCD16^Bright NK Cells from Kidney Transplant Recipients with Antibody-Mediated Rejection Display Increased Proliferation, Self-Renewal, Pro-Inflammatory and Cytotoxic Profile
E. A. Bailly¹, K. Louis¹, C. Macedo¹, B. Ramaswami¹, M. Lucas¹, A. Zeevi¹, C. Lefaucheur², D. Metes¹
¹Department of Surgery, Thomas E. Starzl Transplantation Institute, Pittsburgh, PA, ²INSERM UMR-S976. Endothelium, Inflammation & Alloreactivity, Université de Paris, France
*Purpose: Contribution of NK cells to antibody-mediated rejection (ABMR) injuries have recently been highlighted through transcriptomic analysis and immunohistochemistry of kidney and heart allograft biopsies.…
2020 American Transplant Congress
T Cells from Highly Sensitized Kidney Transplant Patients Display Distinct TCR Repertoires
S. Negi¹, M. Li¹, A. Rutman², S. Paraskevas¹, C. Polychronakos¹, J. Tchervenkov¹
¹RIMUHC, Montreal, QC, Canada, ²McGill University, Montreal, QC, Canada
*Purpose: Sensitization to HLA antigens limits patient’s access to renal transplantation and causes higher risk of acute rejection and graft loss. T-cells, B-cells and donor-specific…
2020 American Transplant Congress
The Addition of Splenectomy to Simultaneous Liver Kidney Transplantation Improves Class II DSA Clearance in Sensitized Patients
V. Fleetwood, D. Aufhauser, C. Papageorge, K. Janek, L. Hidalgo, B. Welch, R. Redfield, J. Mezrich
Department of Transplantation, University of Wisconsin, Madison, WI
*Purpose: The liver allograft clears class I donor specific antibody (DSA) more effectively than class II DSA. Persistent class II DSA in simultaneous liver kidney…
2020 American Transplant Congress
Evaluating Preformed Donor HLA Reactive T Cells Using PIRCHE-II Algorithm
T. Tomosugi¹, K. Iwasaki², S. Sakamoto¹, A. Kanda¹, K. Futamura¹, M. Okada¹, T. Hiramitsu¹, N. Goto¹, S. Narumi¹, Y. Watarai¹, T. Kobayashi², M. Niemann³, E. Spierings⁴
¹Transplant and Endocrine Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Aichi, Japan, ²Kidney Transplant Surgery, Aichi Medical University School of Medicine, Nagakute, Aichi, Japan, ³PIRCHE AG, Berlin, Germany, ⁴University Medical Center Utrecht, Utrecht, Netherlands
*Purpose: De novo donor-specific HLA antibodies (dnDSA) production involves the indirect allorecognition pathway in which recipient CD4+T cells recognize donor-HLA-derived peptide and recipient HLA class…
2020 American Transplant Congress
Stability of Immune Phenotype, Alloreactive, and Antiviral Immunity after Switch to Belatacept-Based Regimen after Kidney Transplantation
J. Schaenman, M. Rossetti, H. Wilhalme, V. Groysberg, G. Sunga, J. Gadzhyan, B. Abdalla, E. Lum, P. Pham, G. Danovitch, J. Veale, H. A. Gritsch, D. Elashoff, E. Reed, S. Bunnapradist
David Geffen School of Medicine at UCLA, Los Angeles, CA
*Purpose: This investigator-initiated study examines the impact of belatacept on T cell immune phenotype and function.*Methods: 19 patients with evidence of calcineurin inhibitor (CNI) toxicity…
2020 American Transplant Congress
Impact of Kidney Transplant Type and Previous Transplant on Baseline Donor-Derived Cell Free DNA
K. K. Sureshkumar, B. Chopra
Nephrology and Hypertension, Allegheny General Hospital, Pittsburgh, PA
*Purpose: Donor derived-cell free DNA (dd-cfDNA) is a biomarker useful in predicting acute rejection in renal allografts. The technology uses next generation sequencing and does…
2020 American Transplant Congress
Offspring to Parent Living Donor Liver Transplantation: An Analysis of the A2ALL Database
R. A. Choudhury¹, H. J. Braun², J. D. Grab², J. L. Dodge², H. B. Moore¹, D. Yoeli¹, J. J. Pomposelli¹, T. Nydam¹, N. L. Ascher², E. A. Pomfret¹, J. P. Roberts²
¹Department of Surgery- Division of Transplantation Surgery, University of Colorado Hospital, Aurora, CO, ²Department of Surgery- Division of Transplantation Surgery, University of California, San Francisco, San Francisco, CA
*Purpose: Recently, there have been concerns regarding inferior graft survival following offspring to parent kidney transplantation due to issues related to alloimmunity during pregnancy. It…