Activated mast cells promote differentiation of B cells into effector cells
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 20531Article in journal (Refereed) PublishedText
Based on the known accumulation of mast cells (MCs) in B cell-dependent inflammatory diseases, including rheumatoid arthritis, we hypothesized that MCs directly modulate B cells. We show here that degranulated, and to a lesser extent naive or IgE-sensitized, MCs activate both naive and B cell receptor-activated B cells. This was shown by increased proliferation, blast formation, and expression of CD19, MHC class II and CD86 in the B cells. Further, MCs stimulated the secretion of IgM and IgG in IgM(+) B cells, indicating that MCs can induce class-switch recombination in B cells. We also show that coculture of MCs with B cells promotes surface expression of L-selectin, a homing receptor, on the B cells. The effects of MCs on B cells were partly dependent on cell-cell contact and both follicular and marginal zone B cells could be activated by MCs. Our findings suggest that degranulated MCs support optimal activation of B cells, a finding that is in line with in vivo studies showing that MCs frequently degranulate in the context of B-cell driven pathologies such as arthritis. Together, our findings show that MCs have the capacity to differentiate B cells to effector cells.
Place, publisher, year, edition, pages
2016. Vol. 6, 20531
Cell and Molecular Biology
IdentifiersURN: urn:nbn:se:uu:diva-279568DOI: 10.1038/srep20531ISI: 000369510600004PubMedID: 26847186OAI: oai:DiVA.org:uu-279568DiVA: diva2:908408
FunderSwedish Rheumatism AssociationSwedish Cancer Society