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Articles tagged "Allorecognition"

  • 2018 American Transplant Congress

    Enrichment of Endogenous Donor-Reactive Tregs in the Spleen and Graft during Transplantation Tolerance is the Result of Treg Proliferation and Conversion from Tconv

    J. Young, D. Yin, M-.L. Alegre, A. Chong.

    Surgery and Medicine, University of Chicago, Chicago, IL.

    Foxp3+ regulatory T cells (Tregs) are critical mediators of immune tolerance and are absolutely required for allograft tolerance in animal models. In addition, clinical trials…
  • 2018 American Transplant Congress

    Identification of Human SIRPa Diversity That Could Regulate Innate Allorecognition

    A. Friday,1 H. Dai,1 A. Williams,1 M. Oberbarnscheidt,1 J. Danska,2 F. Lakkis.1

    1Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA; 2Immunology and Medical Biophysics, University of Toronto, Toronto, ON, Canada.

    Innate allorecognition is a process by which myeloid cells, such as monocytes, distinguish syngeneic from allogeneic cells. Monocytes that recognize donor cells as non-self differentiate…
  • 2018 American Transplant Congress

    Autophagy Impacts Specificity and Characteristics of Innate Alloimmune Responses in Aging

    T. Heinbokel, K. Minami, Y. Nian, A. Elkhal, S. Tullius.

    Transplant Surgery Research Lab, Brigham and Women's Hospital, Boston, MA.

    Aging and chronic antigen exposure shape the balance of innate and adaptive immunity. We hypothesized that autophagy will impact the homeostasis of innate and adaptive…
  • 2018 American Transplant Congress

    Allogeneic T Follicular and T Conventional Responses Assessed by Proliferation, Cytokine Production, and TCR Clonality

    C. Macedo,1 M. Yamada,1 X. Gu,1 M. Suchoroski,2 D. Hamm,2 M. Kaplan,2 D. Metes.1

    1Thomas E. Starzl Transplantation Institute, Pittsburgh; 2Adaptive Biotechnologies, Seattle.

    Background: Human CD4+ T cell allo-immunity plays pivotal roles during cellular and humoral allograft rejection. Our previous analysis showed that allo-reactive precursors were present in…
  • 2018 American Transplant Congress

    Genome Wide Non-HLA Alloimmunity Contributes to Graft Loss after Kidney Transplantation

    R. Reindl-Schwaighofer, A. Heinzel, A. Kainz, K. Jelencsics, O. Viklicky, G. Böhmig, G. Fischer, B. Keating, R. Oberbauer.

    Division of Nephrology and Dialysis, Medical University of Vienna, Vienna, Austria; Department of Nephrology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic; Transplant Institute, University of Pennsylvania, Philadelphia, PA.

    BackgroundChronic rejection is the main cause of renal transplant loss after the first year and has mostly been attributed to alloimmune responses against human leukocyte…
  • 2018 American Transplant Congress

    Specific Monocyte Memory to Allogeneic MHC Mediated by Paired Immunoglobulin Receptors (PIR)

    H. Dai,1 P. Lan,2 A. Friday,1 A. Williams,1 M. Oberbarnscheidt,1 X. Li,2 F. Lakkis.1

    1Surgery, University of Pittsburgh, Pittsburgh, PA; 2Immunobiology, Houston Methodist Hospital, Houston, TX.

    Monocytes distinguish between self and allogeneic non-self and contribute to allograft rejection by generating mature, IL-12+, DCs. The initial trigger of monocyte differentiation to DCs…
  • 2018 American Transplant Congress

    Identification of Macrophage Innate Receptors in Recognition and Rejection of Allogeneic Non-Self in Transplantation

    P. Lan,1 H. Dai,2 W. Liu,1 S. Chen,1 L. Minze,1 Y. Dou,1 Y. Zhao,1 W. Chen,1 X. Xiao,1 P. Pan,1 H-.H. Chen,1 F. Lakkis,2 X. Li.1

    1Immunobiology and Transplant Science Center, Houston Methodist Research Institute, Houston, TX; 2Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA.

    Recent studies in several labs provide compelling evidence that the innate immune cells can recognize and reject allogeneic non-self in an antigen-specific manner, but the…
  • 2018 American Transplant Congress

    C3a Receptor Regulates the CD8 T-Cell Alloresponse via Intrinsic and Extrinsic Mechanisms

    J. Horwitz, D. Mathern, P. Heeger.

    Icahn School of Medicine at Mount Sinai, NY, NY.

    The role of complement in solid organ transplantation continues to evolve with our enhanced understanding of complement's regulation of the alloresponse. Prior work has shown…
  • 2018 American Transplant Congress

    Soluble Fibrinogen-Like Protein 2 Regulates Myeloid-Derived Suppressor Cells Differentiation and Enhances Its Immunosuppressive Function of in Allograft Immunity

    C. Yang, T. Zhu.

    Urology, Zhongshan Hospital, Fudan University, Shanghai, China.

    Soluble fibrinogen-like protein 2 (sFGL2) is a novel immunoregulatory molecule, secreted mainly by regulatory T cells. CD11b+ Gr1+ myeloid-derived suppressor cells (MDSCs) are an important…
  • 2018 American Transplant Congress

    LAG-3 Deletion Upregulates Memory in a Dendritic Cell-Dependent Process

    S. Gibney,1 M. Efre,1 T. Ashry,1 C. Yang,1 T. O'Shea,1,2 R. White,2 P. Russell,1 J. Madsen,1 R. Colvin,2 A. Alessandrini.1,2

    1Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Boston, MA; 2Department of Pathology, Massachusetts General Hospital, Boston, MA.

    Introduction. Cardiac transplantation is critical for management of severe heart failure, but cardiac allografts frequently undergo chronic T-cell-mediated allograft rejection. Our research demonstrates that Lymphocyte…
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