Abstract:
:Lipopolysaccharide (LPS) is a potent natural adjuvant, commonly used to amplify Th1 responses. Here, we report that systemic immunization using LPS generates large numbers of specific Th17 cells in murine small intestinal lamina propria. The priming of these Th17 cells required IL-23p19 production by bone marrow-derived cells. In contrast, IL-23 had no impact on Th1 differentiation or overall numbers of Ag-specific regulatory T cells. Experiments using T-cell adoptive transfers revealed a previously unappreciated mechanism for how Th17 responses are amplified in vivo: stimulation through LPS expanded precommitted Th17 cells rather than causing Th17 differentiation. Second, LPS drove Th17 cell expansion independently of IL-23, demonstrating that this cytokine is not necessary for expansion and possibly functions at an earlier stage in Th17 priming. Our data provide an impetus for using LPS-based peripheral vaccination to augment specific T-cell-mediated immunity in the gut mucosa.
journal_name
J Leukoc Bioljournal_title
Journal of leukocyte biologyauthors
McAleer JP,Liu B,Li Z,Ngoi SM,Dai J,Oft M,Vella ATdoi
10.1189/jlb.0909631subject
Has Abstractpub_date
2010-07-01 00:00:00pages
21-31issue
1eissn
0741-5400issn
1938-3673pii
jlb.0909631journal_volume
88pub_type
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