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Related Experiment Video

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Detection of True IgE-expressing Mouse B Lineage Cells
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Methods to Detect MHC-Specific IgE in Mice and Men.

Anna Marianne Weijler1, Jasmin Mucha1, Andreas Michael Farkas1

  • 1Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.

Frontiers in Immunology
|December 28, 2020
PubMed
Summary

Researchers developed sensitive methods to detect MHC-specific IgE, an antibody linked to organ transplant rejection. This advance aids understanding of antibody-mediated rejection beyond IgG antibodies, improving transplant outcomes.

Keywords:
HLAIgEMHCantibody-mediated rejectiondonor specific antibodiestransplantation

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Area of Science:

  • Immunology
  • Transplantation Science
  • Allergy and Autoimmunity

Background:

  • Humoral immunity, particularly donor-specific antibodies (DSAs) of the IgG isotype, is a key factor in organ transplant rejection (antibody-mediated rejection, ABMR).
  • Current IgG-DSA detection methods do not fully predict ABMR, highlighting the need for understanding other rejection mechanisms.
  • MHC-specific IgE antibodies have been recently identified in murine models and transplant patients, suggesting a novel role in allograft rejection.

Purpose of the Study:

  • To demonstrate established methods for the sensitive and specific detection and characterization of MHC-specific IgE.
  • To explore the role of MHC-specific IgE in organ transplantation and antibody-mediated rejection.
  • To provide tools for distinguishing IgE specificities against different MHC antigens in both murine and human settings.

Main Methods:

  • Development of a sensitive enzyme-linked immunosorbent assay (ELISA) using MHC monomers for detecting MHC-specific IgE in murine models.
  • Establishment of in vitro (rat basophil cell line RBL-2H3) and in vivo (cutaneous hypersensitivity) assays for functional analysis of MHC-specific IgE.
  • Adaptation of a bead assay for detecting HLA-specific IgE in transplant patients, utilizing humanized RBL-2H3 cells for functional assessment.

Main Results:

  • Successful development of sensitive and specific assays for detecting MHC-specific IgE in murine and human samples.
  • Demonstration of MHC-specific IgE production during allograft rejection in mice and transplant patients.
  • Characterization of the functional activity of MHC-specific IgE using both in vitro and in vivo models.

Conclusions:

  • MHC-specific IgE represents a potential novel biomarker and therapeutic target in organ transplantation.
  • The developed methods enable precise detection and functional assessment of MHC-specific IgE, advancing the understanding of ABMR.
  • Further research into IgE's role in transplantation could lead to improved diagnostic strategies and patient outcomes.