ATC Abstracts

American Transplant Congress abstracts

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Articles tagged "Mixed chimerism"

  • 2019 American Transplant Congress

    Bcl-2/Bcl-xL Inhibition by Navitoclax vs. Bcl-2 Alone Inhibition by Venetoclax for Induction of Mixed Chimerism in Non-Human Primates

    H. Sasaki1, D. Ma1, T. Oura1, A. Dehnadi1, I. Rosales2, B. Cosimi1, P. Cippa3, T. Fehr3, T. Kawai1

    1Surgery, Massachusetts General Hospital, Boston, MA, 2Pathology, Massachusetts General Hospital, Boston, MA, 3Medicine, University of Zurich, Zurich, Switzerland

    *Purpose: We recently demonstrated that a specific Bcl-2 inhibitor, Venetoclax, can promote mixed chimerism and renal allograft tolerance in non-human primates (NHPs) with reduced myelosuppressive…
  • 2019 American Transplant Congress

    Donor-Specific Tregs Prolong Peripheral Chimerism in Baboons Receiving GalTKO hCD47-tg Porcine Peripheral Blood Stem Cells

    N. P. Llore1, J. Stern1, G. Pierre1, E. Lopes1, D. Ekanayake-Alper1, P. Alonso-Guallart1, K. Bruestle1, H. Sakai1, D. Ayares2, M. Lorber2, R. Hawley1, D. H. Sachs1, M. Sykes1, A. D. Griesemer1

    1Columbia Center for Translational Immunology, New York, NY, 2United Therapeutics, Silver Springs, MD

    *Purpose: We have previously evaluated the ability of transplantation of polyclonal expanded recipient T regulatory cells to prolong xenogeneic chimerism and skin grafts after transplantation…
  • 2019 American Transplant Congress

    Bcl-2 Inhibition with Venetoclax Promotes Induction of Mixed Chimerism and Renal Allograft Tolerance without Severe Myelosuppression in Non-Human Primate

    H. Sasaki1, D. Ma1, T. Oura1, A. Dehnadi1, I. Rosales2, B. Cosimi1, P. Cippa3, T. Fehr3, T. Kawai1

    1Surgery, Massachusetts General Hospital, Boston, MA, 2Pathology, Massachusetts General Hospital, Boston, MA, 3Medicine, University of Zurich, Zurich, Switzerland

    *Purpose: Specific Bcl-2 inhibition has been shown to promote mixed chimerism and skin allograft tolerance without myelosuppressive conditioning in murine models. To extend this approach…
  • 2018 American Transplant Congress

    Enhancement of Intrinsic Apoptosis via Bcl-2 Inhibition Promotes Induction of Robust Mixed Chimerism and Renal Allograft Tolerance without Myelosuppression in Nonhuman Primates

    T. Oura,1 A. Dehnadi,1 I. Rosales,1 H. Sasaki,1 P. Cippa,2 R. Fehr,2 A. Cosimi,1 T. Kawai.1

    1Surgery, Center for Transplantation Science, Massachusetts General Hospital, Boston, MA; 2Medicine, University of Zurich, Zurich, Switzerland.

    Background: Successful induction of mixed chimerism (MC) and renal allograft tolerance has been achieved in both nonhuman primate (NHP) and man following conditioning that included…
  • 2018 American Transplant Congress

    Robust Hematopoietic Mixed Chimerism and Donor-Specific Skin Allograft Tolerance after Non-Genotoxic Anti-CD117 Immunotoxin Conditioning and Donor Bone Marrow Allotransplantation

    Z. Li,1 A. Czechowicz,2,3,4,5,6,7 A. Scheck,2,3,4,5,6 D. Rossi,3,4,5,6 P. Murphy.1

    1Lab of Molecular Immunology (LMI), NIAID, Bethesda; 2Dept Pediatrics, Div Stem Cell Transplantation and Regenerative Med, Stanford Univ, Stanford; 3Pgram Cellular & Molecular Med, Div Hematology/Oncology, Boston Children's Hosp, Boston; 4Dept Stem Cell & Regenerative Biol, Harvard Univ, Boston; 5Dept Pediatrics, Harvard Med Sch, Boston; 6Harvard Stem Cell Inst, Harvard Univ, Cambridge; 7Dept Pediatric Oncology, Dana Farber Cancer Inst, Boston.

    Establishing hematopoietic chimerism enables donor-specific allograft tolerance; however, chimerism protocols typically require either genotoxic conditioning or mega-doses of donor bone marrow cells (BMC), impeding clinical…
  • 2018 American Transplant Congress

    PD-L1 May Serve as a Biomarker for Chimerism-Induced Tolerance in Kidney Transplant Recipients

    A. Merchak,1 A. Khalil,1 A. Chhabra,1 J. Leventhal,2 S. Ildstad.1

    1University of Louisville, Louisville, KY; 2Northwestern Memorial Hospital, Chicago, IL.

    Durable chimerism is currently the most reliable biomarker of donor specific tolerance. Identifying and validating other predictive biomarkers is therefore a high priority. Since 2009…
  • 2018 American Transplant Congress

    Non-Myeloablative Conditioning with Low-Dose Total Body Irradiation in Place of Cyclophosphamide Induces Mixed Chimerism and Long-Term Immunosuppression Free Allograft Survival without Acute Kidney Injury in HLA Mismatched Kidney Transplantation

    T. Kawai,1 T. Spitzer,1 T. Oura,1 N. Torkoff-Rubin,1 N. Elias,1 M. Sykes,2 R. Colvin,1 D. Sachs,2 A. Cosimi.1

    1Transplant Center, Massachusetts General Hospital, Boston, MA; 2Center for Translational Immunology, Columbia University, New York, NY.

    We have achieved successful induction of long-term immunosuppression (IS) free renal allograft survival in HLA mismatched kidney transplantation using cyclophosphamide (CP) based conditioning and combined…
  • 2018 American Transplant Congress

    Immunity and Tolerance after Bilateral Orthotopic Lung Transplant (BOLT) in Tandem with a CD3+/CD19+ Depleted Vertebral Bone Marrow Transplant (BOLT+BMT) from 1 of 8 HLA-Matched Cadaveric Donors

    P. Szabolcs,1 X. Chen,1 A. Donnenberg,2 M. Hill,1 J. Rowan,1 S. Mcintyre,1 G. Kurland,1 J. Barnum,1 J. McDyer.1

    1BMT-CT, Children Hospital of Pittsburgh UPMC, Pittsburgh, PA; 2IDM-HCC, University of Pittsburgh, Pittsburgh, PA.

    Primary immunodeficiency patients may develop pulmonary complications and most are ineligible for either lung transplant or BMT due to futility. We report our first 2…
  • 2018 American Transplant Congress

    Absolute Quantification of Plasma Graft-Derived Cell-Free DNA for Diagnosis of Kidney Transplant Rejection

    J. Whitlam,1 L. Ling,2 F. Ierino,3 D. Bruno,2 H. Slater,2 D. Power.1

    1Austin Health, Heidelberg, Victoria, Australia; 2Murdoch Childrens Research Institute, Parkville, Victoria, Australia; 3St Vincent's Health, Fitzroy, Victoria, Australia.

    Aim: To study the performance of droplet digital PCR absolute measurement of graft-derived cell-free DNA (gdcfDNA) for the diagnosis of kidney allograft rejection.Methods: Homozygous deletion…
  • 2018 American Transplant Congress

    A Novel Conditioning Approach to Establish Chimerism Using Manipulation of JAK-STAT Pathways

    H. Xu, A. Merchak, L. Kahn, A. Chhabra, Y. Wen, Y. Huang, S. Ildstad.

    Institute for Cellular Therapeutics, University of Louisville, Louisville, KY.

    Hematopoietic chimerism establishes donor-specific tolerance to solid organ allografts. Targeting recipient immune cells (T, NK cells and macrophages) can effectively reduce the dose of total…
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