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American Transplant Congress abstracts

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Articles tagged "Co-stimulation"

  • 2017 American Transplant Congress

    Extracellular Mitochondria Cause B7 Costimulation Blockade Resistant Allograft Rejection in Mice.

    T. Brennan,1 L. Lin,1 M. Song,1 F. Feng,1 Q.-J. Li,2 A. Kirk,1,2 H. Xu.1

    1Surgery, Duke University, Durham, NC; 2Immunology, Duke University, Durham, NC

    Introduction: Mitochondria released in the setting of tissue injury and cell death are a source of damage-associated molecular patterns that activate innate immune responses. We…
  • 2017 American Transplant Congress

    Does Blockade of ICOS/ICOS-L Pathway Act Synergistically with αCD40 Costimulation Pathway Blockade?

    N. O'Neill, T. Zhang, X. Cheng, W. Sun, G. Braileanu, I. Tatarov, W. Hassanein, A. Azimzadeh, R. Pierson.

    University of Maryland School of Medicine, Baltimore, MD

    Purpose: Inducible costimulator (ICOS) on T cells enhances basic T cell responses to foreign antigen, and increased ICOS expression is detected in association with pathogenic…
  • 2017 American Transplant Congress

    Dual Targeting of Costimulation and Proteasome to Desensitize and Prolong Graft Survival of Sensitized Nonhuman Primates.

    J. Kwun,1 C. Burghuber,1 M. Manook,1 B. Ezekian,1 J. Park,1,2 K. Freishlag,1 J. Yoon,1 N. Iwakoshi,3 A. Farris,4 S. Knechtle.1

    1Surgery, Duke Transplant Center, Durham, NC; 2Surgery, Samsung Medical Center, Seoul, Korea; 3Surgery, Emory Transplant Center, Atlanta, GA; 4Pathology, Emory University, Atlanta, GA

    [Background] Pre-formed donor-specific anti-HLA antibodies (DSA) from prior transplantation, transfusion, or pregnancy affects a significant portion (35%) of patients awaiting a kidney transplant. Highly sensitized…
  • 2017 American Transplant Congress

    FcγRIIB-Mediated Coinhibition Attenuates Donor-Reactive CD8+ T Cell Responses.

    A. Morris, D. Pinelli, D. Liu, M. Ford.

    Emory Transplant Center, Emory University, Atlanta, GA

    Memory T cells can be a formidable barrier to long-term, rejection-free allograft survival, particularly in the setting of costimulation blockade. Ongoing work in the field…
  • 2017 American Transplant Congress

    Immunoregulatory Roles of CD137 Signaling in Graft-versus-Host Disease.

    H. Cho,1,2 J. Kim,1 B. Kwon,1,3 J. Lee,1,4 K. Park.1,4

    1Biomedical Research Center, Ulsan University Hospital and School of Medicine, University of Ulsan, Ulsan, Republic of Korea; 2Departments of Surgery, Ulsan University Hospital and School of Medicine, University of Ulsan, Ulsan, Republic of Korea; 3School of Biological Sciences, University of Ulsan, Ulsan, Republic of Korea; 4Department of Internal Medicine, Ulsan University Hospital and School of Medicine, University of Ulsan, Ulsan, Republic of Korea

    CD137 functions mainly as a costimulatory molecule for T cell activation. However, its functions have been found in a variety of other immune and nonimmune…
  • 2017 American Transplant Congress

    mTOR Inhibition Diminishes Peripheral Blood CD8+CD28–CD38hi Effector/Memory T Cells and Facilitates Resolution of Belatacept-Refractory Kidney Rejection.

    C. Castro-Rojas,1 A. Godarova,1 A. Leino,2 R. Alloway,2 M. Jordan,3 E. Woodle,2 D. Hildeman.1

    1Division of Immunobiology, Cincinnati Children's Hospital, University of Cincinnati College of Medicine, Cincinnati, OH; 2Division of Transplantation, University of Cincinnati College of Medicine, Cincinnati, OH; 3Division of Bone Marrow Transplant and Immune Deficiency, Cincinnati Children's Research Foundation, Cincinnati, OH

    Belatacept, a CD28-CD80/86 blocker, was approved by the FDA to provide immunosuppression without nephrotoxicity or cardiovascular and metabolic adverse effects. As part of our multi-center…
  • 2017 American Transplant Congress

    CD4 Depletion Is Necessary and Sufficient for Long-Term Nonhuman Primate Xenotransplant Survival.

    S. Kim, L. Higginbotham, D. Mathews, C. Breeden, A. Stephenson, C. Larsen, M. Ford, J. Tector, A. Adams.

    Emory Transplant Center, Emory University, Atlanta, GA; University of Alabama Birmingham, Birmingham, AL

    Introduction. Xenotransplantation may alleviate the organ shortage, yet experimental renal xenotransplant has met limited success. We have previously reported the longest surviving pig-to-nonhuman primate (NHP)…
  • 2017 American Transplant Congress

    Focal Segmental Glomerulosclerosis Recurrence in Renal Transplant Recipients Treated with Belatacept.

    W. Kitchens, A. Farris, S. Pastan, T. Pearson, C. Larsen, A. Adams.

    Emory Transplant Center, Atlanta, GA

    Introduction: Focal segmental glomerulosclerosis (FSGS) is a cause of end-stage renal failure that frequently recurs following renal transplant, often leading to allograft loss. A recently…
  • 2017 American Transplant Congress

    Potential Mechanism Involving Regulatory T Cells in Induction of Tolerance in Mouse Vascularized Composite Allotransplantation Under Combined Costimulation Blockade.

    M. Anggelia,1,2 Y.-Y. Huang,3 W.-Y. Chuang,4 H.-Y. Cheng,1 G. Brandacher,5 F.-C. Wei,1,2 C.-H. Lin.1,2

    1PRS, Center for Vascularized Composite Allotransplantation, Chang Gung Memorial Hospital, Taoyuan, Taiwan; 2Chang Gung Medical College and Chang Gung University, Taoyuan, Taiwan; 3Nephrology, Chang Gung Memorial Hospital, Taoyuan, Taiwan; 4Pathology, Chang Gung Memorial Hospital, Taoyuan, Taiwan; 5Plastic and Reconstructive Surgery, Johns Hopkins University School of Medicine, Baltimore, MD

    Background: Role of Regulatory T cells in vascularized composite allotransplantation (VCA) remains to be elucidated. In this study, we investigate potential mechanism involved in Tregs…
  • 2017 American Transplant Congress

    CD28 Directed Immunotherapy Is More Potent Than Belatacept in a Nonhuman Primate Xenotransplant Model.

    S. Kim,1 L. Higginbotham,1 D. Mathews,1 C. Breeden,1 A. Stephenson,1 C. Larsen,1 M. Ford,1 J. Tector,2 A. Adams.1

    1Emory Transplant Center, Emory University, Atlanta, GA; 2University of Alabama Birmingham, Birmingham, AL

    Introduction. Xenotransplantation may alleviate the organ shortage, yet experimental renal xenotransplantation has met limited success. T cell-mediated damage remains a critical problem. Our group has…
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