B lymphocytes differentially use the Rel and nuclear factor kappa B1 (NF-kappa B1) transcription factors to regulate cell cycle progression and apoptosis in quiescent and mitogen-activated cells

Grumont, RJ; Rourke, IJ; O&#39;Reilly, LA; Strasser, A; Miyake, K; Sha, W; Gerondakis, S

Author(s): Grumont, RJ; Rourke, IJ; O'Reilly, LA; Strasser, A; Miyake, K; Sha, W; Gerondakis, S;
Details: Publication Year 1998-03-02,Volume 187,Issue #5,Page 663-674
Journal Title: JOURNAL OF EXPERIMENTAL MEDICINE
Publication Type: Journal Article
Abstract: Rel and nuclear factor (NF)-kappa B1, two members of the Rel/NF-kappa B transcription factor family, are essential for mitogen-induced B cell proliferation. Using mice with inactivated Rel or NF-kappa B1 genes, we show that these transcription factors differentially regulate cell cycle progression and apoptosis in B lymphocytes. Consistent with an increased rate of mature B cell turnover in naive nfkb1(-/-) mice, the level of apoptosis in cultures of quiescent nfkb1(-/-), but not c-rel(-/-), B cells is higher. The failure of c-rel(-/-) or nfkb1(-/-) B cells to proliferate in response to particular mitogens coincides with a cell cycle block early in G1 and elevated cell death. Expression of a bcl-2 transgene prevents apoptosis in resting and activated c-rel(-/-) and nfkb1(-/-) B cells, but does not overcome the block in cell cycle progression, suggesting that the impaired proliferation is not simply a consequence of apoptosis and that Rel/NF-kappa B proteins regulate cell survival and cell cycle control through independent mechanisms. In contrast to certain B lymphoma cell lines in which mitogen-induced cell death can result from Rel/NF-kappa B-dependent downregulation of c-myc, expression of c-myc is normal in resting and stimulated c-rel(-/-) B cells, indicating that target gene(s) regulated by Rel that are important for preventing apoptosis may differ in normal and immortalized B cells. Collectively, these results are the first to demonstrate that in normal B cells, NF-kappa B1 regulates survival of cells in GO, whereas mitogenic activation induced by distinct stimuli requires different Rel/NF-kappa B factors to control cell cycle progression and prevent apoptosis.
Publisher: ROCKEFELLER UNIV PRESS
Keywords: T-CELLS; TARGETED DISRUPTION; SUBUNIT COMPOSITION; EXHIBIT DEFECTS; IMMUNE-SYSTEM; MICE LACKING; B/REL FAMILY; EXPRESSION; MURINE; ALPHA
Publisher's Version: https://doi.org/10.1084/jem.187.5.663
Terms of Use/Rights Notice: Refer to copyright notice on published article.

Creation Date: 1998-03-02 12:00:00