title: B-cell maturation in chimaeric mice deficient for the heat stable antigen (HSA/mouse CD24).
abstract: The murine differentiation marker heat stable antigen (HSA) is a GPI-anchored surface glycoprotein showing strong expression on immature B- and T-lymphocytes and gradually reduced expression during maturation. Although HSA has been suggested to be involved in adhesion and/or signalling, its function has not been clearly demonstrated so far. In order to elucidate the function of HSA, we analysed chimaeric mice that were generated by targeted disruption of both HSA alleles in ES cells. These mice contain normal numbers of peripheral B-cells and normal serum IgM and IgG titres of ES cell-derived allotype, demonstrating that HSA expression on B-cells is not an absolute requirement for their maturation. However, a reduction in immature B-cells in the bone marrow and an altered degree of bone marrow and blood chimaerism suggest that HSA expression influences the maturation of B-cells.
authors.affiliation: Max Planck Institut für Immunobiologie, Freiburg, Germany.
authors.forename: R H
authors.initials: RH
authors.lastname: Wenger
authors.forename: M
authors.initials: M
authors.lastname: Kopf
authors.forename: L
authors.initials: L
authors.lastname: Nitschke
authors.forename: M C
authors.initials: MC
authors.lastname: Lamers
authors.forename: G
authors.initials: G
authors.lastname: Köhler
authors.forename: P J
authors.initials: PJ
authors.lastname: Nielsen
mesh_terms: D000483:Alleles; D000818:Animals; D015703:Antigens, CD / Q000235:genetics* / Q000276:immunology; D001402:B-Lymphocytes / Q000166:cytology* / Q000276:immunology; D001483:Base Sequence; D001853:Bone Marrow / Q000276:immunology; D051927:CD24 Antigen; D002678:Chimera / Q000276:immunology*; D002999:Clone Cells; D017931:DNA Primers; D006200:Hair Color / Q000235:genetics; D007136:Immunoglobulins / Q000097:blood; D018655:Lymphocyte Count; D008562:Membrane Glycoproteins; D051379:Mice; D008969:Molecular Sequence Data; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology
chemical_list: D015703:Antigens, CD; D051927:CD24 Antigen; C497890:Cd24a protein, mouse; D017931:DNA Primers; D007136:Immunoglobulins; D008562:Membrane Glycoproteins