International Immunology, Vol. 11, No. 10, 1685-1691,
October 1999
© 1999 Japanese Society for Immunology
Genetically determined aberrant down-regulation of Fc
RIIB1 in germinal center B cells associated with hyper-IgG and IgG autoantibodies in murine systemic lupus erythematosus
1 Department of Pathology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
2 Core Research for Evolutional Science and Technology, Japan Science and Technology Corp., Kawaguchi, Saitama 332-0012, Japan
Correspondence to: T. Shirai, Department of Pathology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
Systemic lupus erythematosus (SLE) is a multigenic disease associated with IgG hypergammaglobulinemia, IgG anti-nuclear antibodies and immune complex (IC)-type glomerulonephritis. In both human and murine SLE, one susceptibility allele has been mapped to the interval linked to the IgG Fc receptor II (Fc
RII) gene on chromosome 1. In spontaneous SLE models of NZB and (NZB x NZW) F1 mice, expression of Fc
RIIB1, which acts as a negative regulator for B cells, was abnormally down-regulated in follicular germinal center B cells from aged mice, compared to findings in non-SLE NZW, while levels in non-germinal center B cells were practically identical. Such strain differences were also evident in young mice upon in vivo stimulation with foreign antigens. In the Fc
RIIB promoter region, the NZB allele has two deletion sites, including transcription factor-binding sites. Analyses using (NZB x NZW) F1 x NZW backcross mice showed that this NZB allele was significantly linked to hyper-IgG, irrespective of the MHC haplotype, while high levels of IgG antibodies specific for DNA were regulated by a combinatorial effect of the F1-unique MHC haplotype and the NZB Fc
RIIB allele. Therefore, the Fc
RIIB promoter polymorphism may possibly predispose to SLE through germinal center B cells abnormally down-regulating Fc
RIIB1 expression upon autoantigen stimulations and thus escaping negative signals for IgG production.
Keywords: autoimmunity, chromosome 1, disease susceptibility allele, IgG Fc receptors, microsatellite, New Zealand mouse strains, promoter polymorphism
Transmitting editor: K. Okumura
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