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2021 AABB Annual Meeting On-Demand

AM21-76: The Stop/Go Signals for B Cells Responses and Alloimmunization

Oct 19, 2021 9:00pm ‐ Oct 19, 2021 10:00pm

Credits: None available.

Members: $20.00
Standard: $25.00


Alloimmunization to transfused products remains a major barrier to safe and efficacious transfusions. Understanding the cues and signals responsible for triggering antibody responses to transfused cells can help to identify potential alloimmunization biomarkers and novel therapeutic targets to prevent and even reverse alloimmunization. In this session, we will describe recent studies on the use of advanced imaging and cell engineering approaches that have led to visualization of leukocyte interactions during an immune response to transfused products, identifying key cell types in driving/stopping alloantibody immune responses. We will also discuss the role of hemolysis in giving a go/no go signal to B cells to differentiate into antibody producing plasma cells in transfused patients with sickle cell disease and describe candidate heme-binding drugs for inhibition of B cell responses for prevention of alloimmunization in sickle cell disease.

Learning Objectives:
  • Describe the role of hemolytic microenvironment in modulating B cell responses.
  • Discuss potential therapeutic targets including heme signaling pathway in reversing alloimmunization.
  • Discuss recent advances in the identification of key immune cell types that dictate alloantibody B cell responses.


  • Dr. Sean Stowell, MD, PhD, Associate Medical Director, Brigham and Women's Hospital Transfusion Service Medical Director, Brigham and Women's Hospital Apheresis Service Associate Director, National Center for Functional Glycomics
  • Dr. Karina Yazdanbakhsh, PhD, Executive Director of Research, New York Blood Center


  • Sean Stowell, MD, PhD : Honoraria: Grifols; Consultant: Argenex, Cellics, Qualtex, Alexion
  • Karina Yazdanbakhsh, PhD : Nothing to Disclose

Credits Available

AM21-76: The Stop/Go Signals for B Cells Responses and Alloimmunization Evaluation

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