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American Transplant Congress abstracts

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Articles tagged "Co-stimulation"

  • 2019 American Transplant Congress

    Peripheral Blood Regulatory T Cells In The Folow In The Kidney-transplant Patients

    M. A. Carmona-Escamilla1, G. Queipo2, L. A. Garcia-Mosqueda3, R. Lascurain4

    1Nephrology, Pemex, CDMX, Mexico, 2Genetics, Hospital General, CDMX, Mexico, 3UNAM, CDMX, Mexico, 4Inmunologia, UNAM, CDMX, Mexico

    *Purpose: Investigate the peripheral blood levels of CD4+CD25+FOXP3p3+ regulatory T cells (Tregs) in patients with kidney transplant at least one year after kidney transplantation and…
  • 2019 American Transplant Congress

    Costimulation Blockade Modulates Humoral Responses in Highly Sensitized Transplant Recipients

    J. Kwun, B. Ezekian, P. Schroder, M. Manook, J. Yoon, M. Mulvihill, K. Freischlag, J. Yi, S. Knechtle

    Surgery, Duke Transplant Center, Durham, NC

    *Purpose: Broad human leukocyte antigen sensitization is a significant barrier to successful solid organ transplantation. Sensitized patients have poor access to donor organs, high wait…
  • 2019 American Transplant Congress

    FcγRIIB is a Novel CD8+ Effector T Cell Intrinsic Regulatory Pathway That Correlates with Freedom from Rejection in Renal Transplant Patients

    A. B. Morris1, D. F. Pinelli1, D. Liu1, J. M. Boss2, C. D. Scharer2, M. Fribourg3, P. Cravedi3, P. S. Heeger3, M. L. Ford1

    1Surgery, Emory University, Atlanta, GA, 2Micro & Immuno, Emory University, Atlanta, GA, 3Center for Translational Transplant Research, Icahn SOM at Mount Sinai, New York, NY

    *Purpose: To understand the functional role and clinical relevance of FcγRIIB on CD8+ T cells in transplantation.*Methods: See results*Results: FcγRIIB is the sole inhibitory Fcγ…
  • 2019 American Transplant Congress

    IFNAR Signaling Augments Plasmacytoid Dendritic Cell Activation during Costimulation Independent Rejection

    J. Habib, D. Mathews, Y. Dong, A. Stephenson, A. Ghosh, C. Breeden, A. Adams

    Surgery, Emory University, Atlanta, GA

    *Purpose: Costimulation blockade (CoB) is a promising new transplant immunosuppression strategy offering improved long-term patient and allograft survival without the nephrotoxicity of calcineurin inhibitors. However,…
  • 2019 American Transplant Congress

    The Use of mTOR Inhibitors Prevents Acute Cellular Rejection in Kidney Transplantation on Belatacept Therapy

    J. Shoji, J. C. Leung, Q. Tang, J. P. Roberts, F. Vincenti

    University of California San Francisco, San Francisco, CA

    *Purpose: Belatacept is a costimulatory blocker that is used as de novo maintenance immunosuppression in kidney transplantation to avoid toxic effects of calcineurin inhibitors and…
  • 2019 American Transplant Congress

    Memory T Follicular Helper Cell Alloresponse is Memory B Cell Independent and Inhibited by CD28 Costimulation Blockade

    S. Zeng, G. M. La Muraglia II, M. L. Ford, I. R. Badell

    Emory University School of Medicine, Atlanta, GA

    *Purpose: Donor-directed HLA antibodies are an important cause of renal allograft injury, but reliable and durable therapeutic options to prevent or eliminate donor-specific antibodies (DSA)…
  • 2019 American Transplant Congress

    In Vivo Treg Expansion under Costimulation Blockade Targets Early Rejection and Improves Long-Term Outcome

    C. Schwarz1, B. Mahr2, L. Unger1, N. Pilat2, H. Regele3, T. Wekerle2

    1Dept. of Surg. / Div. of Transplantation, Medical University Vienna, Vienna, Austria, 2Dept. of Surg. / Section of Transplantation Immunology, Medical University Vienna, Vienna, Austria, 3Clinical Institute of Pathology, Medical University Vienna, Vienna, Austria

    *Purpose: Early rejection episodes are a major problem under CTLA4Ig/belatacept-based immunosuppression. We have previously shown that CTLA4Ig therapy is dependent on Tregs at low (LD)…
  • 2018 American Transplant Congress

    Patients Converted to Belatacept Show Different Immunophenotyping Compared with De Novo Belatacept-Treated Patients

    M. Rial,1 F. Caro,2 A. Nella,2 D. Guerrieri,2 L. León,1 P. Uva,1 E. Chuluyan,2 D. Casadei.1

    1Instituto de Nefrología, Nephrology, Buenos Aires, Argentina; 2CEFYBO, UBA, CONICET, Buenos Aires, Argentina.

    The incidence of adverse clinical events mainly in early, but not late post-transplantation such as an increased rate of acute rejection precludes the use of…
  • 2018 American Transplant Congress

    Loss of HIF-1α in CD4 T Cell Improve Outcome of Mouse Vascularized Osteomyocutaneous Allotransplantation under Costimulation Blockade

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

    1PRS, Center for VCA, 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; 5PRS, Johns Hopkins University School of Medicine, Baltimore, MD.

    Background: Allograft survival depends on the balance of effector T cells (Teff) and regulatory T cells (Tregs). Previous study suggested that the balance is controlled…
  • 2018 American Transplant Congress

    Thymic Irradiation as a Maneuver for Repertoire Exchange in Costimulatory-Blockade-Based Immunotherapy

    M. Mulvihill,1 B. Ezekian,1 Q. Gao,1 K. Samy,1 R. Davis,1 F. Leopardi,1 W. Giles,2 F-.F. Yin,2 C. Willett,2 B. Collins,1 A. Kirk.1

    1Department of Surgery, Duke University, Durham, NC; 2Department of Radiation Oncology, Duke University, Durham, NC.

    Background All successful, prospective clinical tolerance-induction strategies have employed thymic irradiation to achieve chimerism. However, evidence suggests durable chimerism is not required to attain tolerance.…
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