title: Resolution and characterization of pro-B and pre-pro-B cell stages in normal mouse bone marrow.
abstract: We have resolved B220+ IgM- B-lineage cells in mouse bone marrow into four fractions based on differential cell surface expression of determinants recognized by S7 (leukosialin, CD43), BP-1, and 30F1 (heat stable antigen). Functional differences among these fractions can be correlated with Ig gene rearrangement status. The largest fraction, lacking S7, consists of pre-B cells whereas the others, expressing S7, include B lineage cells before pre-B. These S7+ fractions, provisionally termed Fr. A, Fr. B, and Fr. C, can differentiate in a stromal layer culture system. Phenotypic alteration during such culture suggests an ordering of these stages from Fr. A to Fr. B to Fr. C and thence to S7- pre-B cells. Using polymerase chain reaction amplification with pairs of oligonucleotide primers for regions 5' of JH1, DFL16.1, and Jk1, we find that the Ig genes of Fr. A are in germline configuration, whereas Fr. B and C are pro-B cell stages with increasing D-J rearrangement, but no V-D-J. Finally, functional analysis demonstrates that the proliferative response to IL-7, an early B lineage growth factor, is restricted to S7+ stages and, furthermore, that an additional, cell contact-mediated signal is essential for survival of Fr. A.
authors.affiliation: Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
authors.forename: R R
authors.initials: RR
authors.lastname: Hardy
authors.forename: C E
authors.initials: CE
authors.lastname: Carmack
authors.forename: S A
authors.initials: SA
authors.lastname: Shinton
authors.forename: J D
authors.initials: JD
authors.lastname: Kemp
authors.forename: K
authors.initials: K
authors.lastname: Hayakawa
mesh_terms: D000818:Animals; D015703:Antigens, CD; D000954:Antigens, Surface / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D001402:B-Lymphocytes / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D001483:Base Sequence; D001710:Biotin / Q000378:metabolism; D001853:Bone Marrow / Q000276:immunology / Q000378:metabolism; D001854:Bone Marrow Cells; D002454:Cell Differentiation / Q000502:physiology; D002462:Cell Membrane / Q000378:metabolism / Q000648:ultrastructure; D002478:Cells, Cultured; D004247:DNA / Q000032:analysis / Q000235:genetics; D005260:Female; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain / Q000235:genetics / Q000276:immunology; D015328:Gene Rearrangement, B-Lymphocyte, Light Chain / Q000235:genetics / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D007143:Immunoglobulin Heavy Chains / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D051917:Leukosialin; D051379:Mice; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D010641:Phenotype; D010799:Phycoerythrin / Q000378:metabolism; D016133:Polymerase Chain Reaction; D012795:Sialoglycoproteins / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D000954:Antigens, Surface; D007143:Immunoglobulin Heavy Chains; D051917:Leukosialin; D010446:Peptide Fragments; D012795:Sialoglycoproteins; C497863:Spn protein, mouse; D010799:Phycoerythrin; D001710:Biotin; D004247:DNA