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B RelA-deficient Lymphocytes: Normal Development
of T Cells and B Cells, Impaired Production of IgA and
IgG1 and Reduced Proliferative Responses
By

From the * Laboratory of Immunology and the To investigate the function of NF-
Laboratory of Experimental Pathology, Aichi Cancer
Center Research Institute, Chikusa-ku, Nagoya 464; and the § Research Institute for Biological
Sciences, Science University of Tokyo, Noda 278, Japan
B RelA (p65), we generated mice deficient in this NF-
B
family member by homologous recombination. Mice lacking RelA showed liver degeneration
and died around embryonic day 14.5. To elucidate the role of RelA in lymphocyte development and function, we transplanted fetal liver cells of 13.5-day embryos from heterozygote
matings into irradiated SCID mice. Within 4 weeks, both T and B cells had developed in the
SCID mice receiving relA
/
fetal liver transplants, similar to the relA+/+ and +/
cases.
T cells were found to mature to Thy-1+/TCR
+/CD3+/CD4+ or CD8+, while B cells had
the ability to differentiate to IgM+/B220+ and to secrete immunoglobulins. However, the
secretion of IgG1 and IgA was reduced in RelA-deficient B cells. Furthermore, both T and B
cells lacking RelA showed marked reduction in proliferative responses to stimulation with Con
A, anti-CD3, anti-CD3+anti-CD28, LPS, anti-IgM, and PMA+calcium ionophore. The results indicate that RelA plays a critical role in production of specific Ig isotypes and also in signal transduction pathways for lymphocyte proliferation.
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