B cell receptor-mediated internalization of salmonella: a novel pathway for autonomous B cell activation and antibody production - PubMed (original) (raw)

. 2009 Jun 15;182(12):7473-81.

doi: 10.4049/jimmunol.0802831.

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• PMID: 19494270
• DOI: 10.4049/jimmunol.0802831

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B cell receptor-mediated internalization of salmonella: a novel pathway for autonomous B cell activation and antibody production

Yuri Souwer et al. J Immunol. 2009.

Free article

Abstract

The present paradigm is that primary B cells are nonphagocytosing cells. In this study, we demonstrate that human primary B cells are able to internalize bacteria when the bacteria are recognized by the BCR. BCR-mediated internalization of Salmonella typhimurium results in B cell differentiation and secretion of anti-Salmonella Ab by the Salmonella-specific B cells. In addition, BCR-mediated internalization leads to efficient Ag delivery to the MHC class II Ag-loading compartments, even though Salmonella remains vital intracellularly in primary B cells. Consequently, BCR-mediated bacterial uptake induces efficient CD4(+) T cell help, which boosts Salmonella-specific Ab production. BCR-mediated internalization of Salmonella by B cells is superior over extracellular Ag extraction to induce rapid and specific humoral immune responses and efficiently combat infection.

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