Antigen Transfer from Exosomes to Dendritic Cells as an Explanation for the Immune Enhancement Seen by IgE Immune Complexes

Authors

Rebecca K. Martin, Virginia Commonwealth UniversityFollow
Keith B. Brooks, Virginia Commonwealth University
Frida Henningsson, Uppsala University
Birgitta Heyman, Uppsala University
Daniel H. Conrad, Virginia Commonwealth UniversityFollow

Document Type

Article

Original Publication Date

2014

Journal/Book/Conference Title

PLoS ONE

Volume

9

Issue

10

DOI

10.1371/journal.pone.0110609

Comments

Originally published at http://dx.doi.org/10.1371/journal.pone.0110609

Date of Submission

November 2015

Abstract

IgE antigen complexes induce increased specific T cell proliferation and increased specific IgG production. Immediately after immunization, CD23+ B cells capture IgE antigen complexes, transport them to the spleen where, via unknown mechanisms, dendritic cells capture the antigen and present it to T cells. CD23, the low affinity IgE receptor, binds IgE antigen complexes and internalizes them. In this study, we show that these complexes are processed onto B-cell derived exosomes (bexosomes) in a CD23 dependent manner. The bexosomes carry CD23, IgE and MHC II and stimulate antigen specific T-cell proliferation in vitro. When IgE antigen complex stimulated bexosomes are incubated with dendritic cells, dendritic cells induce specific T-cell proliferation in vivo, similar to IgE antigen complexes. This suggests that bexosomes can provide the essential transfer mechanism for IgE antigen complexes from B cells to dendritic cells.

Rights

© 2014 Martin et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Is Part Of

VCU Microbiology and Immunology Publications