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* Department of Microbiology, Division of Developmental and Clinical Immunology, and
Department of Pathology, University of Alabama, Birmingham, AL 35294
Recent studies have implicated a role for Notch in the generation of marginal zone (MZ) B cells. To further investigate the role of Notch in the B cell lineage, we have analyzed the effects of reduced Notch2 signaling in mice expressing one functional allele of Notch2 (Notch2+/-). Notch2+/- mice have reduced B1 B cells of the peritoneal cavity and show a severe reduction in MZ B cells of the spleen. The reduction in MZ B cells was not due to the disruption of splenic architecture, disregulated terminal differentiation, nor to increased apoptosis within the MZ B cell compartment. Rather, our data suggest that Notch2 haploinsufficiency leads to impaired development of MZ B cells, possibly by impacting the formation of immediate MZ B precursors. These results provide evidence that Notch2 plays a determining role in the development and/or the maintenance of B1 B and MZ B cells.
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