title: Most marginal zone B cells in rat express germline encoded Ig VH genes and are ligand selected.
abstract: The present study was performed to analyze whether marginal zone B (MZ-B) cells in nondeliberately immunized adult rats are selected on basis of the specificity of their B cell receptor, and to determine to what extent memory B cells contribute to the MZ-B cell subset. To this end, the Ig PC7183 V(H) gene repertoire was studied among V(H)DJ(H)-mu transcripts expressed in four sequential stages of B cell development, of two individual untreated adult rats. B cell subsets, i.e., pro/pre-B cells and newly formed B (NF-B) cells from bone marrow, and recirculating follicular B cells and MZ-B cells from spleen were sorted by flow cytometry. In addition, from one these rats, cells were microdissected from follicular and MZ areas of the spleen and productive PC7183 V(H) gene rearrangements were analyzed for the presence of somatic mutations. Sequence analysis reveals that most MZ-B cells in the adult rat, either defined by flow cytometry or by their anatomical location in the spleen, express germline encoded V(H) genes (naive MZ-B cells) and a minor fraction (about 20%) of the MZ-B cells carry somatic mutations (memory MZ-B cells). In addition, we show that naive MZ-B cells are a selected population of cells, both based on PC7183 V(H) gene repertoire and on the length of the Ig heavy (H) chain complementarity-determining region 3 (H-CDR3) region, i.e., PC7183 V(H)DJ(H)-mu transcripts of MZ-B cells carry significantly shorter H-CDR3 regions than other B cell subsets.
authors.affiliation: Departments of Histology and Cell Biology and Clinical Immunology, University of Groningen, Groningen, The Netherlands. p.m.dammers@med.rug.nl
authors.forename: P M
authors.initials: PM
authors.lastname: Dammers
authors.forename: A
authors.initials: A
authors.lastname: Visser
authors.forename: E R
authors.initials: ER
authors.lastname: Popa
authors.forename: P
authors.initials: P
authors.lastname: Nieuwenhuis
authors.forename: F G
authors.initials: FG
authors.lastname: Kroese
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000916:Antibody Diversity / Q000235:genetics; D016175:B-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism*; D001483:Base Sequence; D001854:Bone Marrow Cells / Q000276:immunology / Q000378:metabolism; D002469:Cell Separation; D022801:Complementarity Determining Regions / Q000096:biosynthesis / Q000235:genetics; D004252:DNA Mutational Analysis; D004210:Dissection; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000276:immunology; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D018095:Germ-Line Mutation; D007143:Immunoglobulin Heavy Chains / Q000096:biosynthesis / Q000235:genetics*; D007144:Immunoglobulin J-Chains / Q000096:biosynthesis / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000096:biosynthesis / Q000235:genetics*; D007148:Immunoglobulin mu-Chains / Q000096:biosynthesis / Q000235:genetics; D008024:Ligands; D008297:Male; D008846:Micromanipulation; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000276:immunology; D051381:Rats; D011919:Rats, Inbred Strains; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D014158:Transcription, Genetic / Q000276:immunology
chemical_list: D022801:Complementarity Determining Regions; D007143:Immunoglobulin Heavy Chains; D007144:Immunoglobulin J-Chains; D007135:Immunoglobulin Variable Region; D007148:Immunoglobulin mu-Chains; D008024:Ligands