Villous B Cells of the Small Intestine Are Specialized for Invariant NK T Cell Dependence

B cells are important in mucosal microbial homeostasis through their well-known role in secretory IgA production and their emerging role in mucosal immunoregulation. Several specialized intraintestinal B cell compartments have been characterized, but the nature of conventional B cells in the lamina...

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Bibliographic Details
Published in:The Journal of immunology (1950) 2008-04, Vol.180 (7), p.4629-4638
Main Authors: Velazquez, Peter, Wei, Bo, McPherson, Michael, Mendoza, Lesley Marie A, Nguyen, Sandra L, Turovskaya, Olga, Kronenberg, Mitchell, Huang, Tiffany T, Schrage, Matthew, Lobato, Lynn N, Fujiwara, Daisuke, Brewer, Sarah, Arditi, Moshe, Cheng, Genhong, Sartor, R. Balfour, Newberry, Rodney D, Braun, Jonathan
Format: Article
Language:English
Subjects:
Aging - physiology
Animals
Antigen Presentation - immunology
Antigens, CD1 - genetics
Antigens, CD1 - immunology
Antigens, CD1 - metabolism
B-Lymphocytes - cytology
B-Lymphocytes - immunology
Cell Movement - immunology
Cell Separation
Intestinal Mucosa - cytology
Intestinal Mucosa - immunology
Intestine, Small - cytology
Intestine, Small - immunology
Intestine, Small - ultrastructure
Mice
Mice, Knockout
Microvilli - immunology
Phenotype
Receptors, Antigen, B-Cell - immunology
Sensitivity and Specificity
Signal Transduction - immunology
T-Lymphocytes, Regulatory - immunology
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Summary:B cells are important in mucosal microbial homeostasis through their well-known role in secretory IgA production and their emerging role in mucosal immunoregulation. Several specialized intraintestinal B cell compartments have been characterized, but the nature of conventional B cells in the lamina propria is poorly understood. In this study, we identify a B cell population predominantly composed of surface IgM(+) IgD(+) cells residing in villi of the small intestine and superficial lamina propria of the large intestine, but distinct from the intraepithelial compartment or organized intestinal lymphoid structures. Small intestinal (villous) B cells are diminished in genotypes that alter the strength of BCR signaling (Bruton tyrosine kinase(xid), Galphai2(-/-)), and in mice lacking cognate BCR specificity. They are not dependent on enteric microbial sensing, because they are abundant in mice that are germfree or genetically deficient in TLR signaling. However, villous B cells are reduced in the absence of invariant NK T cells (Jalpha18(-/-) or CD1d(-/-) mice). These findings define a distinct population of conventional B cells in small intestinal villi, and suggest an immunologic link between CD1-restricted invariant NK T cells and this B cell population.
ISSN:0022-1767
1550-6606
DOI:10.4049/jimmunol.180.7.4629