Articles tagged "B cells"

2022 American Transplant Congress
Disruption of B Cell Population is Associated with Increased Infections in Pediatric Transplant Recipients
B. Geng, L. Loop, C. Anterasian, D. Mortazavi, J. Kitsen, C. Collins, K. Newton, E. Ingulli
Pediatrics, UCSD Rady Children's, San Diego, CA
*Purpose: Solid-organ transplant recipients are placed on long-term immunosuppression, preventing graft rejection but increasing the risk of infection. Pediatric transplant recipients are at increased risk…
2022 American Transplant Congress
Tolerant B Cells Suppress Memory B Cells in a Donor Specific Manner in CoB Mediated Transplantation Tolerance
S. Durgam¹, D. Yin¹, M. Alegre², A. Chong¹
¹Surgery, section of transplant immunology, University of Chicago, Chicago, IL, ²Medicine, section of rheumatology, University of Chicago, Chicago, IL
*Purpose: We previously reported that B cells in recipients made tolerant to fully mismatched heart allografts by anti-CD154+donor spleen cells (CoB) become dysfunctional in their…
2022 American Transplant Congress
Contributions of Allogenicity and Antigen Presentation to Regulatory B Cell Suppression
K. Lee, F. Qiang, K. Deng, R. Matheson, J. Lei, C. LeGuern, J. Markmann
Center for Transplantation Sciences, Boston, MA
*Purpose: We previously generated in vitro Toll-like receptor (TLR)-activated B cells became regulatory B cells (Bregs) that suppress T cell proliferation and promote allograft tolerance.…
2022 American Transplant Congress
Abnormal B Cell Profile Associated with Inadequate Antibody Response to MRNA SARS-COV-2 Vaccine Can Be Overcome with a Third Vaccine Dose in Adolescent Kidney Transplant Recipients
C. Crane, E. Phebus, L. Loop, C. Anterasian, B. Geng, E. Ingulli
Pediatrics, UCSD Rady Children's, San Diego, CA
*Purpose: mRNA SARS-CoV-2 vaccines are highly efficacious in the general population but have shown a diminished response in immunosuppressed adolescent kidney allograft recipients. We investigated…
2022 American Transplant Congress
Specificity and Avidity of Donor MHC-Specific B Cells in Naive, Rejecting and Tolerant Mice
I. Sayin¹, S. Khiew², D. Yin¹, P. Sage³, C. B. Cavazzoni³, R. King⁴, A. Chong¹
¹Department of Surgery, University of Chicago, Chicago, IL, ²Merck, Boston, MA, ³Brigham and Women's Hospital, Boston, MA, ⁴Department of Microbiology, University of Alabama, Birmingham, AL
*Purpose: Antibody-mediated rejection is recognized as an important mediator of graft loss in the clinic, and the induction of donor-specific B cell tolerance may contribute…
2022 American Transplant Congress
Circulating and Intragraft Donor (HLA)-Specific B Cells Drive Allograft Rejection After Kidney Transplantation
A. Torija¹, N. Bolaños¹, L. Donadeu¹, M. Meneghini², I. Torres², A. Gabaldon², M. Gomà³, E. Crespo¹, F. Moreso⁴, O. Bestard²
¹Vall d'Hebron Research Institute (VHIR), Barcelona, Spain, ²Vall d'Hebron University Hospital, Barcelona, Spain, ³Bellvitge University Hospital, Barcelona, Spain, ⁴Vall d'Heron University Hospital, Barcelona, Spain
*Purpose: Besides donor-specific antibodies (DSA), circulating donor(HLA)-specific memory B cells (mBc) have also shown to play a deleterious role driving antibody-mediated rejection (ABMR) in kidney…
2022 American Transplant Congress
Pre-Emptive Rituximab Use for Epstein-Barr Virus (EBV) Viremia in Cardiothoracic Solid Organ Transplant Recipients
B. Astorga, A. Loethen, L. Potter
University of Chicago Medicine, Chicago, IL
*Purpose: EBV viremia is associated with potentially life-threatening post-transplant lymphoproliferative disorders (PTLD) after solid organ transplantation. The utility of rituximab for treating EBV viremia in…
2022 American Transplant Congress
Donor-Specificb Cell Dysfunction and Suppressive Ability Are Differentially Induced in Cob-Mediated Transplantation Tolerance
S. Durgam¹, D. Yin¹, M. Alegre², A. Chong¹
¹Surgery, section of transplant immunology, University of Chicago, Chicago, IL, ²Medicine, section of rheumatology, University of Chicago, Chicago, IL
*Purpose: B cells in mice tolerized to fully mismatched heart allografts with anti-CD154+donor spleen cells (CoB) are intrinsically dysfunctional and unable to differentiate into germinal…
2022 American Transplant Congress
Regulatory T and B Cell Responses Are Equally Compromised During Antibody-Mediated Rejection of Kidney Allografts
K. Louis¹, P. Fadakar², C. Macedo², M. Yamada², M. Lucas², X. Gu², A. Zeevi², P. Randhawa², C. Lefaucheur³, D. Metes²
¹Inserm U976, Human Immunology and Immunopathology, Paris, France, ²Surgery, University of Pittsburgh, Pittsburgh, PA, ³Inserm U970, Paris Translational Research Center for Organ Transplantation, Paris, France
*Purpose: Although considerable advances have been made in understanding the cellular effector mechanisms responsible for donor-specific antibody (DSA) generation leading to antibody-mediated rejection (ABMR), the…
2022 American Transplant Congress
Identification of a Human B Cell State with Allogeneic Antigen Cross-Presenting Potential
U. Bhatia, E. C. Guinan
Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA
*Purpose: B cells are known to play a significant role in allograft tolerance or rejection, largely determined by production of cytokines and antibodies that suppress…