title: Defined blocks in terminal plasma cell differentiation of common variable immunodeficiency patients.
abstract: Common variable immunodeficiency (CVID) is a heterogeneous disorder characterized by defective Ab production and recurrent bacterial infections. The largely unknown causes are likely to comprise a diverse set of genetic or acquired defects. In this study, we investigated terminal B cell differentiation in lymph nodes from CVID patients. Up to the germinal center B cell stage, B cell differentiation was normal but terminal plasma cell development was found to be impaired. Using differential Blimp-1 and Syndecan-1 expression in controls, we defined three different plasma cell subsets that correspond to progressive developmental stages locating to different sites in the lymph node. In the CVID patients, we could only detect one or two of these subsets indicating a defective differentiation. Thus, terminal plasma cell differentiation was found to be impaired despite normal expression of Blimp-1. B cells reaching only the first stage of plasma cell differentiation were further unable to undergo isotype switching and to up-regulate activation markers on B cells stimulated in vitro.
authors.affiliation: Clinical Research Unit for Rheumatology, University Hospital of Freiburg, Freiburg, Germany.
authors.forename: Nadine
authors.initials: N
authors.lastname: Taubenheim
authors.forename: Marcus
authors.initials: M
authors.lastname: von Hornung
authors.forename: Anne
authors.initials: A
authors.lastname: Durandy
authors.forename: Klaus
authors.initials: K
authors.lastname: Warnatz
authors.forename: Lynn
authors.initials: L
authors.lastname: Corcoran
authors.forename: Hans-Hartmut
authors.initials: HH
authors.lastname: Peter
authors.forename: Hermann
authors.initials: H
authors.lastname: Eibel
mesh_terms: D000328:Adult; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology / Q000473:pathology; D002454:Cell Differentiation / Q000276:immunology*; D017074:Common Variable Immunodeficiency / Q000276:immunology* / Q000473:pathology; D004268:DNA-Binding Proteins / Q000172:deficiency / Q000235:genetics; D005260:Female; D018858:Germinal Center / Q000276:immunology / Q000473:pathology; D006801:Humans; D017578:Immunoglobulin Class Switching / Q000235:genetics; D007156:Immunologic Memory / Q000235:genetics; D053631:Interleukin Receptor Common gamma Subunit; D051379:Mice; D018345:Mice, Knockout; D008875:Middle Aged; D010950:Plasma Cells / Q000276:immunology* / Q000473:pathology; D020395:Receptors, Interleukin-7 / Q000172:deficiency / Q000235:genetics; D027041:Somatic Hypermutation, Immunoglobulin / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; C507941:IL2RG protein, human; C507942:Il2rg protein, mouse; D053631:Interleukin Receptor Common gamma Subunit; C499308:Rag2 protein, mouse; D020395:Receptors, Interleukin-7