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- W2157364629 endingPage "2812" @default.
- W2157364629 startingPage "2803" @default.
- W2157364629 abstract "Abstract B cells possess functional characteristics of innate immune cells, as they can present Ag to T cells and can be stimulated with microbial molecules such as TLR ligands. Because crude preparations of Staphylococcus aureus are frequently used as polyclonal B cell activators and contain potent TLR2 activity, the scope of this study was to analyze the impact of S. aureus-derived TLR2-active substances on human B cell activation. Peripheral B cells stimulated with chemically modified S. aureus cell wall preparations proliferated in response to stimulation with crude cell wall preparations but failed to be activated with pure peptidoglycan, indicating that cell wall molecules other than peptidoglycan are responsible for B cell proliferation. Subsequent analysis revealed that surface protein A (SpA), similar to BCR cross-linking with anti-human Ig, sensitizes B cells for the recognition of cell wall-associated TLR2-active lipopeptides (LP). In marked contrast to TLR7- and TLR9-triggered B cell stimulation, stimulation with TLR2-active LP and SpA or with crude cell wall preparations failed to induce IgM secretion, thereby revealing qualitative differences in TLR2 signaling compared with TLR7/9 signaling. Notably, combined stimulation with SpA plus TLR2 ligands induced vigorous proliferation of a defined B cell subset that expressed intracellular IgM in the presence of IL-2. Conclusion: S. aureus triggers B cell activation via SpA-induced sensitization of B cells for TLR2-active LP. Combined SpA and TLR2-mediated B cell activation promotes B cell proliferation but fails to induce polyclonal IgM secretion as seen after TLR7 and TLR9 ligation." @default.
- W2157364629 created "2016-06-24" @default.
- W2157364629 creator A5036344856 @default.
- W2157364629 creator A5036493478 @default.
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- W2157364629 creator A5070273513 @default.
- W2157364629 creator A5082570606 @default.
- W2157364629 creator A5090327349 @default.
- W2157364629 date "2007-03-01" @default.
- W2157364629 modified "2023-09-26" @default.
- W2157364629 title "<i>Staphylococcus aureus</i> Protein A Triggers T Cell-Independent B Cell Proliferation by Sensitizing B Cells for TLR2 Ligands" @default.
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- W2157364629 doi "https://doi.org/10.4049/jimmunol.178.5.2803" @default.
- W2157364629 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17312124" @default.