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* Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;
Department of Otolaryngology and Sensory Organ Surgery, Osaka University Graduate School of Medicine, Osaka, Japan;
Core Research for Engineering, Science, and Technology, Japan Science and Technology Corp., Tokyo, Japan;
Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan; and
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Division of Mucosal Immunology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
Secretory IgA plays a crucial role in the host immune response as a first line of defense. A recent demonstration of in situ IgA class switching in intestinal lamina propria provided an opportunity to reconsider the model for the homing of IgA-committed B cells characterized by distinctive trafficking patterns to effector sites. Those effector sites depend on the organized mucosa-associated lymphoid tissues as their site of induction. In this report we show the preferential presence of IgM+B220+ and IgA+B220+ cells belonging to pre- and post-IgA isotype class-switched cells in the organized mucosa-associated lymphoid tissues, such as nasopharynx-associated lymphoid tissues, isolated lymphoid follicles, and Peyer’s patches, and the defect of those populations in the diffuse effector tissues, such as the nasal passage and intestinal lamina propria. Consistent with these findings, the expressions of a series of IgA isotype class switch recombination-related molecules, including activation-induced cytidine deaminase, I
-Cµ circle transcripts, and I-Cµ circle transcripts, were selectively detected in these organized mucosa-associated lymphoid structures, but not in the diffuse mucosal effector sites. Taken together, these findings suggest that IgA isotype class switching occurs only in the organized mucosa-associated lymphoid organs (e.g., nasopharynx-associated lymphoid tissues, isolated lymphoid follicles, and Peyer’s patches), but not in the diffuse effector tissues of the upper respiratory and gastrointestinal tracts.
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