title: IL-2 receptor alpha chain (CD25, TAC) expression defines a crucial stage in pre-B cell development.
abstract: The analysis of the expression of the alpha chain of the IL-2 receptor (CD25, TAC) on the surface of B lineage cells in mouse bone marrow reveals that it is a useful marker to distinguish pre-B-I from pre-B-II cells. CD25 is not expressed on CD45R(B220)+ c-kit+ CD43+ TdT+ lambda 5+ c mu- sIg-IgH chain locus DJH-rearranged pre-B-I cells of mouse bone marrow. It is expressed on large cycling CD45R(B220)+ c-kit- CD43+ TdT- lambda 5+ c mu+ sIg- and on small resting CD45R(B220)+ c-kit- CD43- TdT- lambda 5- c mu- sIg- IgH chain locus VHDJH-rearranged pre-B-II cells. Therefore, the transition from pre-B-I to large pre-B-II cells is marked by the downregulation of c-kit and terminal deoxynucleotidyl transferase (TdT), and by the upregulation of CD25. SCID, RAG-2T, microMT and lambda 5T mutant mice do have normal, if not elevated numbers of pre-B-I cells but lack all CD25+ pre-B-II cells in their bone marrow. The expression of a transgenic H chain under control of the microH chain enhancer in RAG-2T bone marrow B lineage precursors allows the development of large and small CD25+ pre-B-II cells. The results suggest that the differentiation of pre-B-I to pre-B-II cells in mouse bone marrow requires the expression of microH chains and surrogate L chains in membranes, probably on the surface of precursor B cells.
authors.affiliation: Basel Institute for Immunology, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Rolink
authors.forename: U
authors.initials: U
authors.lastname: Grawunder
authors.forename: T H
authors.initials: TH
authors.lastname: Winkler
authors.forename: H
authors.initials: H
authors.lastname: Karasuyama
authors.forename: F
authors.initials: F
authors.lastname: Melchers
mesh_terms: D000818:Animals; D015703:Antigens, CD; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002454:Cell Differentiation / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D051917:Leukosialin; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008817:Mice, Mutant Strains; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis; D019009:Proto-Oncogene Proteins c-kit; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis; D016184:Receptors, Colony-Stimulating Factor / Q000096:biosynthesis; D015375:Receptors, Interleukin-2 / Q000096:biosynthesis* / Q000737:chemistry / Q000502:physiology; D012795:Sialoglycoproteins / Q000096:biosynthesis
chemical_list: D015703:Antigens, CD; D051917:Leukosialin; D011518:Proto-Oncogene Proteins; D016184:Receptors, Colony-Stimulating Factor; D015375:Receptors, Interleukin-2; D012795:Sialoglycoproteins; C497863:Spn protein, mouse; D019009:Proto-Oncogene Proteins c-kit; D020794:Receptor Protein-Tyrosine Kinases