Articles tagged "Alloantibodies"

2021 American Transplant Congress
DSA is Associated with Molecular Changes in Many Hearts with Minor Abnormalities but Not Diagnosed as Antibody-Mediated Rejection
P. Halloran¹, K. S. Madill-Thomsen¹, &. the INTERHEART Study Group²
¹Alberta Transplant Applied Genomics Centre, Edmonton, AB, Canada, ²., ., AB, Canada
*Purpose: We previously developed a microarray-based diagnostic system (MMDx) for heart transplant endomyocardial biopsies, measuring gene expression and interpreting antibody-mediated and T cell-mediated rejection (ABMR,…
2021 American Transplant Congress
Quantifying Hidden Sensitization: HLA-reactive Memory B Cells in the Spleens of Sensitized Women
J. T. Killian¹, J. A. Houp¹, A. Nellore², R. G. King³, P. M. Porrett¹, F. E. Lund³
¹Department of Surgery, University of Alabama at Birmingham School of Medicine, Birmingham, AL, ²Department of Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, AL, ³Department of Microbiology, University of Alabama at Birmingham School of Medicine, Birmingham, AL
*Purpose: Measurement of circulating anti-HLA antibody (anti-HLA-Ab) in transplant candidates and recipients is required for successful organ transplantation. However, serum Ab measurement alone likely underestimates…
2021 American Transplant Congress
Measuring the Impact of Targeting FcRn-Mediated IgG Recycling on Donor-Specific Alloantibodies in a Sensitized NHP Model
M. Manook¹, W. Flores², R. Schmitz¹, Z. Fitch¹, J. Yoon¹, Y. Bae¹, B. I. Shaw¹, M. Harnois³, S. Permar³, A. Kirk¹, D. Magnani², J. Kwun¹, S. Knechtle¹
¹Duke Transplant Center, Duke University Medical Center, Durham, NC, ²Massbiologics, University of Massachusetts Medical School, Boston, MA, ³Human Vaccine Institute, Duke University Medical Center, Durham, NC
*Purpose: In transplantation, plasmapheresis and IVIg provide the mainstay of treatment directed at reducing or removing circulating donor specific antibody (DSA), yet both have limitations.…
2021 American Transplant Congress
A Novel Mouse Model of Cardiac Allograft Vasculopathy
H. Tsuda¹, E. Reed², W. Baldwin¹, R. Fairchild¹
¹Inflammation and Immunity, Cleveland Clinic, Cleveland, OH, ²Pathology and Laboratory Medicine, University of California, Los Angeles, CA
*Purpose: Cardiac allograft vasculopathy (CAV) is a major long-term complication of heart transplantation and the presence of donor specific antibodies (DSA) is associated with an…
2021 American Transplant Congress
Acoustofluidic Device to Remove Donor Specific Antibody in a Sensitized Animal Model
J. Kwun¹, E. David², Y. Gu³, Z. Ma³, M. Kuchibhatla⁴, G. Arepally⁵, T. J. Huang³, E. T. Chambers²
¹Surgery, Duke University, Durham, NC, ²Pediatrics, Duke University, Durham, NC, ³Biomedical Engineering, Duke University, Durham, NC, ⁴Biostatistics and Bioinformatics, Duke University, Durham, NC, ⁵Internal Medicine, Duke University, Durham, NC
*Purpose: Current therapies for antibody-mediated rejection are neither donor-specific nor are they tailored toward children, resulting in premature allograft loss and increased mortality. Apheresis involves…
2021 American Transplant Congress
The Absence of T Follicular Regulatory Cells Prolongs Germinal Center Reactivity in Transplantation
E. S. Crichton, S. Zeng, I. Badell
Emory University, Atlanta, GA
*Purpose: Deleterious alloantibodies result from T follicular helper (Tfh) cell-driven germinal center (GC) reactivity. T follicular regulatory (Tfr) cells are a subset of regulatory T…
2021 American Transplant Congress
Cd4 T Cells Can Trigger Nk-dependent Chronic Rejection Independent of Antibodies
R. G. Gill¹, B. Mehrad², C. M. Lin²
¹Surgery, University of Colorado Denver, Aurora, CO, ²Medicine, University of Florida, Gainesville, FL
*Purpose: In transplantation, recipient CD4+ T cells have two potential means of MHC class II-restricted donor antigen detection: (1) the direct recognition of allogeneic MHC…
2021 American Transplant Congress
Alloreactive Memory T Follicular Helper Cells Rapidly Differentiate Into Effectors Independent of B Cell Memory Following Retransplantation
S. Zeng, E. S. Crichton, I. R. Badell
Department of Surgery, Emory, Atlanta, GA
*Purpose: Donor-directed HLA antibodies are an important cause of renal allograft injury, but effective therapeutic options to prevent or eliminate donor-specific antibodies (DSA) do not…
2021 American Transplant Congress
Use of a Novel Bead-based Assay to Measure the Impact of Imlifidase on ABO IgG Antibodies
A. Halpin¹, B. Motyka², T. Ellis², J. Pearcey², T. L. Lowary³, A. Runström⁴, L. Winstedt⁴, R. Bockermann⁴, S. Järnum⁴, A. Robertson⁴, L. J. West⁵
¹Department of Pediatrics and Laboratory Medicine and Pathology, University of Alberta and Alberta Precision Laboratories, Edmonton, AB, Canada, ²Department of Pediatrics, University of Alberta, Edmonton, AB, Canada, ³Department of Chemistry, University of Alberta, Edmonton, AB, Canada, ⁴Hansa Biopharma, Lund, Sweden, ⁵Department of Pediatrics and Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
*Purpose: The accurate assessment and measurement of ABO antibodies (ABO-Ab) is a critical component of ABO-incompatible (ABOi) transplantation. ABO-Ab comprise both IgG and IgM, which…
2021 American Transplant Congress
Outcomes of Deceased Donor Transplants with Donor Specific Antibodies Before and After the New Kidney Allocation System
R. Crew, P. Khairallah, S. S. Patel
Columbia University, New York, NY
*Purpose: KAS forced centers to list unacceptable HLA antigens. Some centers excluded antigens at any level of anti-HLA Ab. Our center only excluded antibodies posing…