Abstract:
:Whereas gut IgA responses to the microbiota may be multi-centered and diverse, little is known about IgA responses to T-cell-dependent antigens following oral immunizations. Using a novel approach, gut IgA responses to oral hapten (4-hydroxy-3-nitrophenyl)acetyl-cholera toxin (NP-CT) conjugates were followed at the cellular and molecular level. Surprisingly, these responses were highly synchronized, strongly oligoclonal, and dominated by affinity matured cells. Extensive lineage trees revealed clonal relationships between NP-specific IgA cells in gut inductive and effector sites, suggesting expansion of the same B-cell clone in multiple Peyer's patches (PPs). Adoptive transfer experiments showed that this was achieved through re-utilization of already existing germinal centers (GCs) in multiple PPs by previously activated GC GL7(+) B cells, provided oral NP-CT was given before cell transfer. Taken together, these results explain why repeated oral immunizations are mandatory for an effective oral vaccine.
journal_name
Mucosal Immunoljournal_title
Mucosal immunologyauthors
Bergqvist P,Stensson A,Hazanov L,Holmberg A,Mattsson J,Mehr R,Bemark M,Lycke NYdoi
10.1038/mi.2012.56subject
Has Abstractpub_date
2013-01-01 00:00:00pages
122-35issue
1eissn
1933-0219issn
1935-3456pii
mi201256journal_volume
6pub_type
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