Marginal zone (MZ) B cells play a major role in the first-line responses against blood-born T-independent bacterial antigens (TI), but the full scope of their immune functions is not known. Here we compare the responses of MZ and follicular (FO) B cells to a T-dependent antigen (TD), hapten–(4-hydroxy-3-nitrophenyl)acetyl (NP) coupled to chicken γ-globulin, in a cell transfer system. Consistent with the conventional paradigm, MZ B cells but not FO B cells rapidly generated the early burst of NP-specific antibody-forming cells (AFC), high levels of IgM Ab, and early IgG with relatively high affinity to NP. However, MZ B cells were also capable of forming germinal centers (GCs) albeit with a delay, compared with FO B cells. The early AFCs and the GCs originated from different MZ precursors, but the MZ- and FO-derived GCs were similar in VH gene repertoire, somatic mutation, and production of late AFC and IgG Ab. Surprisingly, the MZ but not the FO memory response included IgM Ab. We conclude that MZ B cells are heterogeneous, comprising cells for both early AFC response and GC/memory pathway against TD antigens.
Functional Heterogeneity of Marginal Zone B Cells Revealed by Their Ability to Generate Both Early Antibody-forming Cells and Germinal Centers with Hypermutation and Memory in Response to a T-dependent Antigen
Published 2003 in Journal of Experimental Medicine
ABSTRACT
PUBLICATION RECORD
- Publication year
2003
- Venue
Journal of Experimental Medicine
- Publication date
2003-12-15
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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