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CD23b isoform expression in human schistosomiasis identifies a novel subset of activated B cells

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Publication Date
2011
Author
Onguru, Daniel O.
Liang, YanMei
Elliot, Jennifer
Mwinzi, Pauline
Ganley-Leal, Lisa
Type
Article
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Abstract/Overview

Resistance to schistosomiasis is associated with increased levels of serum parasite-specific IgE. IgE exerts its functions through its cellular receptors, FcεRI and FcεRII/CD23; however, its functional significance requires further characterization in humans. We previously reported that increased levels of CD23+ B cells correlate with resistance to schistosomiasis in hyper-exposed populations and sought to define their potential function and relationship with IgE. We found that CD23+ B cells are a heterogeneous cell population with functional and phenotypic differences. Circulating CD23+ B cells are uniquely activated in schistosomiasis and express the CD23b isoform and CXCR5, the homing receptor for lymphoid follicles. High CXCR5 expression by CD23+ B cells was associated with the capacity to home to cognate ligand, CXCL13. CD23-bound IgE cross-linking increased surface expression of CXCR5 suggesting that CD23+ B cells home directly into the lymphoid follicles upon antigen capture. As human schistosomiasis is an intravascular parasitic infection associated with a high antigenic burden in the blood, circulating CD23+ B cells may play a role in capture and shuttling of antigens directly to splenic follicles, highlighting a new role for circulating B cells. This function likely plays an important role in the development of protective immunity to infection with schistosomes

Subject/Keywords
CD23; human; B cells; schistosomiasis; IgE
Publisher
American Society for Microbiology
Permalink
http://ir.jooust.ac.ke:8080/xmlui/handle/123456789/2882
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