Articles tagged "B cells"

2022 American Transplant Congress
Optimal Development and Effector Function of Antibody-Suppressor CXCR5⁺CD8⁺ T Cells Requires Host IFN-γ and CD4⁺ T Cells
J. Zimmerer, S. Chaudhari, M. Hart, J. Han, K. Koneru, G. Bumgardner
OSUWMC, Columbus, OH
*Purpose: We reported the discovery of a novel subset of CXCR5+IFNγ+CD8+ T cells that suppresses antibody production (CD8+ TAb-supp cells). Alloprimed CD8+ TAb-supp cells significantly…
2022 American Transplant Congress
Single Cell And Spatial Transcriptomics Of Blood And Biopsies Reveals Enhanced Alloantigen Presenting Function And T-follicular Helper Cell (tfh) Expansion Early After Pediatric Liver Transplantation
R. Sindhi¹, C. Ashokkumar¹, M. Ningappa¹, D. Rajasundaram¹, B. W. Higgs¹, Q. Xu², A. Zeevi², M. Reyes-Mugica¹
¹Childrens Hospital of Pittsburgh of UPMC, Pittsburgh, PA, ²University of Pittsburgh Medical Center, Pittsburgh, PA
*Purpose: We have previously reported enhanced B-cell presentation of donor antigen during early T-cell mediated liver transplant (LT) rejection.*Methods: To characterize B-cell related immunological mechanisms…
2022 American Transplant Congress
Validation of Donor Specific Antibody Characteristics Associated with Deleterious Outcomes: A Single Center Study of 940 Kidney Allograft Recipients
P. Lamba¹, I. Lamba¹, R. Friedlander², V. Sharma³, J. Lee², J. B. Lee⁴, C. Hartono⁵, M. Thangamani⁶, D. Sawinski², T. Salinas⁷, M. Suthanthiran⁸, D. Dadhania⁹
¹Nephrology, Hypertension and Transplantation, New York Presbyterian/Weill Cornell Medicine, New York, NY, ²New York Presbyterian/Weill Cornell Medicine, New York, NY, ³The Rogosin Inst Cornell UMC, New York, NY, ⁴Rogosin Institute, New York, NY, ⁵New York Presbyterian Hospital-Weill Cornell, New York, NY, ⁶Cornell, New York, NY, ⁷Nephrology, NY Presbyterian- Weill Cornell, New York, NY, ⁸Weill Cornell Med Ctr., New York, NY, ⁹Weill Cornell Medicine - NYPH, New York, NY
*Purpose: A reproducibility crisis is pervasive in scientific literature. We aimed to investigate whether the DSA characteristics we previously associated with antibody mediated rejection (AMR)…
2022 American Transplant Congress
Comparison of IGG and IGM Type B Cell Receptor-Mediated MTOR Phosphorylation Signal
Y. Matsuda
Division of Transplant Immunology, Division of Transplant Immunology, Tokyo, Japan
*Purpose: IgG and IgM memory B cells (mBCs) corresponding donor-specific antigen are closely involved in the activation of humoral immunity against transplanted grafts. Therefore, it…
2022 American Transplant Congress
Local Intragraft Humoral Immune Response in Chronic Lung Allograft Dysfunction
E. Miyamoto¹, S. C. Juvet², D. Vosoughi², J. Wang², J. Al-Refaee², T. Daigneault², A. Duong², S. Moshkelgosha², S. Keshavjee², K. Tinckam², A. Chruscinski³, D. Hwang⁴, T. Martinu²
¹Tenri Hospital Japan, University Health Network Canada, Nara, Japan, ²University Health Network, Toronto, ON, Canada, ³Multi-Organ Transplantation, University Health Network, Toronto, ON, Canada, ⁴Sunnybrook Health Science Centre, Toronto, ON, Canada
*Purpose: Donor HLA-specific antibody (DSA) and antibody against self-antigens (self-antigen antibody) can cause injury and lead to chronic lung allograft dysfunction (CLAD) after lung transplantation…
2022 American Transplant Congress
CD40 Expressed by FRC Regulates Lymph Node Structure and Function
M. W. Shirkey¹, L. Li¹, R. Abdi², J. S. Bromberg¹
¹University of Maryland School of Medicine, Baltimore, MD, ²Transplant Research Center, Harvard Medical School, Boston, MA
*Purpose: Fibroblastic reticular cells (FRC) support lymph node (LN) structure and can regulate T cell function through the CD40-CD40L pathway. Our previous work showed that…
2022 American Transplant Congress
Assessment of Circulating B Cell Developmental Stages Early After Kidney Transplantation. Preliminary Data from a Single Center
A. Fouza¹, A. Fylaktou², A. Xohelli², E. Sampani³, B. Nikolaidou², D. Asouhidou², N. Antoniadis¹, E. Kasimatis³, M. Stangou³, G. Tsoulfas¹, A. Papagianni³
¹Division of Transplantation, Department of Surgery, Aristotle University of Thessaloniki, Thessaloniki, Greece, ²National Peripheral Histocompatibility Center, Immunology Department, Hippokration General Hospital of Thessaloniki, Thessaloniki, Greece, ³Department of Nephrology, Aristotle University of Thessaloniki, Thessaloniki, Greece
*Purpose: B lymphocytes (BL) is an important immune component in the function of kidney transplants, through antibody production, antigen-presentation to T cells, secretion of cytokines,…
2022 American Transplant Congress
Characterization Of Gzmb+ Bregs Using Single Cell Rnaseq
N. Sailliet, H. Le Mai, A. Dupuy, C. Fourgeux, M. Chesneau, J. Poschmann, R. Danger, S. Brouard
CRT2I INSERM UMR1064, Nantes, France
*Purpose: Granzyme B (GZMB)+ B cells are increased in blood from transplanted patients who tolerate a kidney graft without immunosuppressive treatment. We demonstrated that these…
2021 American Transplant Congress
Lung Transplant Recipients Developing Early DSAs are Characterized by a Shift Towards Memory B Cells Directly After Transplantation
S. Christoph¹, A. Hitz¹, R. Bellmàs Sanz¹, J. Kühne¹, B. Wiegmann², F. Ius², J. Salman², E. Chichelnitskiy¹, T. Siemeni², W. Sommer³, A. Haverich², G. Warnecke³, C. Falk¹
¹Institute of Transplant Immunology, MHH, Hannover, Germany, ²Department of Cardiothoracic, Transplant and Vascular Surgery, MHH, Hannover, Germany, ³Department of Cardiac Surgery, University Hospital Heidelberg, Heidelberg, Germany
*Purpose: After lung transplantation (LTx), the development of early donor HLA-specific antibodies (eDSA) is associated with antibody-mediated rejection (AMR) and poor graft survival. Since 2013,…
2021 American Transplant Congress
Properties of Regulatory B Cells Suppressing B Cells
Q. Fu¹, K. Lee², K. Deng², G. Huai², C. Rickert², H. Yang¹, C. LeGuern², S. Deng¹, J. F. Markmann²
¹Organ Transplantation Center, Sichuan Provincial People's Hospital, University of Electronic Sciences and Technology of China, Chengdu, China, ²Center for Transplantation Sciences, MGH, Boston, MA
*Purpose: Our previous study showed that TLR-Bregs, regulatory B cells generated in vitro through TLR activation, suppressed naïve B cell proliferation triggered by a mitogen…

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