Journal of Leukocyte Biology eBioscience full spectrum cell analysis
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Originally published online as doi:10.1189/jlb.1107788 on March 27, 2008

Published online before print March 27, 2008
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(Journal of Leukocyte Biology. 2008;83:1370-1378.)
© 2008 by Society for Leukocyte Biology

Moraxella catarrhalis-dependent tonsillar B cell activation does not lead to apoptosis but to vigorous proliferation resulting in nonspecific IgM production

Johan Jendholm*, Martin Samuelsson*, Lars-Olaf Cardell{dagger}, Arne Forsgren* and Kristian Riesbeck*,1

* Medical Microbiology, Department of Laboratory Medicine and
{dagger} Laboratory of Clinical and Experimental Allergy Research, Department of Otorhinolaryngology, Malmö University Hospital, Lund University, Malmö, Sweden

1Correspondence: Medical Microbiology, Department of Laboratory Medicine, Malmö University Hospital, Lund University, SE-205 02 Malmö, Sweden. E-mail: kristian.riesbeck{at}med.lu.se

ABSTRACT

The respiratory pathogen Moraxella catarrhalis has a high affinity for human IgD and is mitogenic for peripheral blood B lymphocytes. Moraxella IgD-binding protein, which is a multifunctional outer membrane protein with adhesive properties, is responsible for the interaction. Previous experiments with the Ig-binding B cell superantigens protein A and protein L from Staphylococcus aureus and Peptostreptococcus magnus, respectively, have suggested that nonimmune BCR cross-linking induces B cell apoptosis through the intrinsic pathway. The goal of this study was to characterize early and late B cell events in the presence of M. catarrhalis in comparison with S. aureus. Despite an increased phosphatidyl serine translocation as revealed by Annexin V binding in flow cytometry analyses, neither M. catarrhalis nor S. aureus induced activation-associated apoptotic cell death in purified human tonsillar B cells. In contrast, a vigorous B cell proliferation, as quantified using thymidine incorporation and CFSE staining, was observed. An increased expression of an array of surface proteins (i.e., CD19, CD21, CD40, CD45, CD54, CD69, CD86, CD95, and HLA-DR) and IgM production was found upon activation with M. catarrhalis. In conclusion, M. catarrhalis-dependent B cell activation does not result in apoptosis but in cell division and nonspecific IgM synthesis, suggesting that the bacterial interaction with tonsillar B cells serves to redirect the early adaptive immune response.

Key Words: B lymphocyte • immunoglobulin D • Staphylococcus aureus • superantigen






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