title: Ontogeny and distribution of the murine B cell Fc gamma RII.
abstract: The distribution and expression of the IgG FcRII (Fc gamma RII) on normal murine B cells was examined. Using multicolor flow cytometry, spleens from neonatal mice of increasing age and adult bone marrow were analyzed for expression of the Fc gamma RII. In addition, B cells from peripheral lymphoid organs, as well as panel of B cell tumors, were tested. The results demonstrate that the Fc gamma RII is expressed on all pre-B cells and immature B cells in the neonatal spleen and adult bone marrow, on all mature B cells in peripheral lymphoid organs, and on switched B cells in Peyer's patches. Furthermore, the Fc gamma RII was found to be present on B cell tumors representative of all stages of B cell maturation and differentiation. Taken together, the results indicate that Fc gamma RII is expressed during the entire lifetime of the B cell. In addition, examination of spleen cells from neonatal mice revealed a large number of pre-B cells, phenotypically defined as B220+, IgM-. These pre-B cells were present at birth, peaked in number between 2 and 3 wk of age, and became a minor population by day 30. Further phenotypic analysis of these cells demonstrated the expression of the BLA-1 and BP-1 Ag, and the lack of T cell and NK cell markers, thus confirming their assignment to the B cell lineage. Finally, the Fc gamma RII present on these pre-B cells was shown to be functional, by virtue of its ability to bind aggregated IgG.
authors.affiliation: Department of Pathology, University of Iowa College of Medicine, Iowa City 52242.
authors.forename: T M
authors.initials: TM
authors.lastname: Foy
authors.forename: R G
authors.initials: RG
authors.lastname: Lynch
authors.forename: T J
authors.initials: TJ
authors.lastname: Waldschmidt
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000032:analysis* / Q000502:physiology; D016175:B-Lymphocyte Subsets / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000276:immunology; D007074:Immunoglobulin G / Q000378:metabolism*; D007075:Immunoglobulin M / Q000032:analysis; D051379:Mice; D008807:Mice, Inbred BALB C; D011961:Receptors, Fc / Q000032:analysis* / Q000502:physiology; D017452:Receptors, IgG
chemical_list: D000943:Antigens, Differentiation; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D011961:Receptors, Fc; D017452:Receptors, IgG