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Department of Genetics, Osaka University Medical School, Yamadaoka, Suita;
Osaka Bioscience Institute, Furuedai, Suita; and
Osaka Medical Center for Maternal and Child Health, Izumi, Osaka, Japan
Fas is a member of the TNF receptor family. Binding of Fas ligand to Fas induces apoptosis in Fas-bearing cells. Fas is expressed in various cells, including thymocytes, peripheral T cells, and activated B cells. The mouse lpr mutation is a loss of function mutation of Fas. MRL-lpr/lpr mice develop lymphadenopathy and splenomegaly, and produce multiple autoantibodies, which results in autoimmune disease. In this report, we describe the establishment of a line of Fas transgenic MRL-lpr mice in which mouse Fas cDNA was expressed using the T cell-specific murine lck promoter. The transgenic mice expressed functional Fas in thymocytes and peripheral T cells, but not in B cells. The transgenic mice did not accumulate abnormal T cells (Thy-1+ B220+), but still accumulated B cells (Thy-1- B220+); they produced a large quantity of Igs (IgG1 and IgG2a), including anti-DNA Abs, and developed glomerulonephritis. These results suggest that autoreactive or activated B cells must be killed through Fas expressed in the B cells by the Fas ligand expressed in activated T cells.
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