title: B-1a cells are imprinted by the microenvironment in spleen and peritoneum.
abstract: B-1a cells are found mainly in the peritoneal cavity of mice but are also present in the spleen. Gene expression profiling defined many genes differentially expressed in B-1a cells from these two sites. To see whether this gene expression pattern was imprinted by the particular microenvironment, peritoneal or spleen cells from recombinant L2 mice mainly consisting of B-1a cells were adoptively transferred into Rag1-/- mice. Re-isolated peritoneal and splenic B-1a cells were analyzed for expression of three indicator genes--vcam-1, adamdec1 and spi-c. The expression of these genes was up-regulated in splenic and down-regulated in peritoneal cells. This particular pattern was observed for peritoneal or splenic donor cells transferred either intraperitoneally or intravenously. Similar results were obtained when levels of surface IgM or frequencies of Mac-1+ B-1 cells were compared after transfer. This suggests that the environment induces the particular genetic program of B-1a cells and argues against an independent ontogeny.
authors.affiliation: Molecular Immunology, HZI, Helmholtz Centre for Infection Research, Braunschweig, Germany.
authors.forename: Britta
authors.initials: B
authors.lastname: Stoermann
authors.forename: Karsten
authors.initials: K
authors.lastname: Kretschmer
authors.forename: Sandra
authors.initials: S
authors.lastname: Düber
authors.forename: Siegfried
authors.initials: S
authors.lastname: Weiss
mesh_terms: D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism; D019264:Adoptive Transfer; D000818:Animals; D016175:B-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D007075:Immunoglobulin M / Q000378:metabolism; D007146:Immunoglobulin lambda-Chains / Q000235:genetics / Q000378:metabolism; D016177:Macrophage-1 Antigen / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008822:Mice, Transgenic; D010537:Peritoneum / Q000166:cytology / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000276:immunology*; D019010:Vascular Cell Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; D007075:Immunoglobulin M; D007146:Immunoglobulin lambda-Chains; D016177:Macrophage-1 Antigen; C423918:Spic protein, mouse; D019010:Vascular Cell Adhesion Molecule-1; C064658:RAG-1 protein; D051722:ADAM Proteins