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The Journal of Immunology, 2003, 170: 4564-4571.
Copyright © 2003 by The American Association of Immunologists

B1 Cells Contribute to Serum IgM, But Not to Intestinal IgA, Production in Gnotobiotic Ig Allotype Chimeric Mice1

M. Christine Thurnheer*, Adrian W. Zuercher*, John J. Cebra* and Nicolaas A. Bos2,{dagger}

* Department of Biology, University of Pennsylvania, Philadelphia, PA 19104; and {dagger} Department of Cell Biology, Section Histology and Immunology, Faculty of Medical Sciences, University of Groningen, Groningen, The Netherlands

B1 cells are a significant source of natural serum IgM, thereby serving as a first line of defense against systemic bacterial and viral infections. They can migrate to the intestinal lamina propria and differentiate into IgA-producing plasma cells and thus might play a similar role in mucosal immunity. To investigate the contribution of B1 cells to the intestinal IgA response induced by the commensal flora in immunocompetent animals, we generated gnotobiotic and conventionally reared Ig allotype chimeric mice. In this system B1- and B2-derived Abs can be distinguished based on different allotypes. FACS analysis of peritoneal cavity cells and analysis of B1- and B2-derived serum IgM indicated stable B1/B2 chimerism and the establishment of a functional B1 population. Monoassociation with either Morganella morganii, Bacteroides distasonis, or segmented filamentous bacteria induced germinal center reactions in Peyer’s patches and led to the production of intestinal IgA, partially reactive with bacterial Ag. A considerable amount of serum IgM was B1 cell derived in both monoassociated and conventionally reared mice. However, most of the total as well as bacteria-specific intestinal IgA was produced by B2 cells. These data suggest that intestinal IgA production induced by commensal bacteria is mainly performed by B2, not B1, cells.




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