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The Journal of Immunology, 1998, 161: 3974-3983.
Copyright © 1998 by The American Association of Immunologists

Deletion of Bone Marrow Stromal Cell Antigen-1 (CD157) Gene Impaired Systemic Thymus Independent-2 Antigen-Induced IgG3 and Mucosal TD Antigen-Elicited IgA Responses1

Motoyuki Itoh*, Katsuhiko Ishihara*, Takachika Hiroi{dagger}, Byung Ok Lee*, Hisoka Maeda*, Hideki Iijima{dagger}, Manabu Yanagita{dagger}, Hiroshi Kiyono{dagger} and Toshio Hirano2,*

* Division of Molecular Oncology, Biomedical Research Center, Osaka University Medical School, Osaka, Japan; and {dagger} Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan

Bone marrow stromal cell Ag-1 (BST-1; CD157)-deficient mice were generated to examine the immunologic roles of the molecule in vivo. In BST-1-/- mice, the development of peritoneal B-1 cells was delayed, and CD38low/- B-lineage cells were increased in the bone marrow and spleen. Partial impairment of thymus-independent (TI-2) and thymus-dependent (TD) Ag-specific immune responses was noted in the systemic and mucosal compartments of BST-1-/- mice, respectively. Although serum Ig levels as well as TD and TI-1 Ag-specific systemic immune responses were normal, the TI-2 Ag-induced IgG3 response was selectively impaired. Oral immunization of BST-1-/- mice with cholera toxin, a potent TD Ag for the induction of IgA response, resulted in the poor production of Ag-specific Abs at the intestinal mucosa accompanied by the reduced number of Ag-specific IgA-producing cells in the lamina propria. These results indicate that BST-1 has roles in B cell development and Ab production in vivo.




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