title: Defective B cell tolerance checkpoints in systemic lupus erythematosus.
abstract: A cardinal feature of systemic lupus erythematosus (SLE) is the development of autoantibodies. The first autoantibodies described in patients with SLE were those specific for nuclei and DNA, but subsequent work has shown that individuals with this disease produce a panoply of different autoantibodies. Thus, one of the constant features of SLE is a profound breakdown in tolerance in the antibody system. The appearance of self-reactive antibodies in SLE precedes clinical disease, but where in the B cell pathway tolerance is first broken has not been defined. In healthy humans, autoantibodies are removed from the B cell repertoire in two discrete early checkpoints in B cell development. We found these checkpoints to be defective in three adolescent patients with SLE. 25-50% of the mature naive B cells in SLE patients produce self-reactive antibodies even before they participate in immune responses as compared with 5-20% in controls. We conclude that SLE is associated with abnormal early B cell tolerance.
authors.affiliation: Laboratory of Molecular Immunology, The Rockefeller University, New York, NY, USA.
authors.forename: Sergey
authors.initials: S
authors.lastname: Yurasov
authors.forename: Hedda
authors.initials: H
authors.lastname: Wardemann
authors.forename: Johanna
authors.initials: J
authors.lastname: Hammersen
authors.forename: Makoto
authors.initials: M
authors.lastname: Tsuiji
authors.forename: Eric
authors.initials: E
authors.lastname: Meffre
authors.forename: Virginia
authors.initials: V
authors.lastname: Pascual
authors.forename: Michel C
authors.initials: MC
authors.lastname: Nussenzweig
mesh_terms: D000293:Adolescent; D001323:Autoantibodies / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology* / Q000473:pathology; D002460:Cell Line; D002648:Child; D005260:Female; D006801:Humans; D007108:Immune Tolerance / Q000276:immunology*; D008180:Lupus Erythematosus, Systemic / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D008297:Male; D010718:Phosphatidylserines / Q000276:immunology / Q000378:metabolism
chemical_list: D001323:Autoantibodies; D010718:Phosphatidylserines
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