Publication: c-Fos induces apoptosis in germinal center B cells
Issued Date
1998-10-15
Resource Type
ISSN
00221767
Other identifier(s)
2-s2.0-0032532293
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Immunology. Vol.161, No.8 (1998), 3853-3861
Suggested Citation
Kunimasa Inada, Seiji Okada, Janyaporn Phuchareon, Masahiko Hatano, Toyohiko Sugimoto, Hideshige Moriya, Takeshi Tokuhisa c-Fos induces apoptosis in germinal center B cells. Journal of Immunology. Vol.161, No.8 (1998), 3853-3861. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/18374
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
c-Fos induces apoptosis in germinal center B cells
Abstract
We examined the role of c-Fos in the differentiation of mature B cells into IgG-producing Cells using transgenic mice carrying the c-fos gene under the control of the IFN-α/β-inducible Mx promoter (Mx-c-fos) or the constitutive H-2Kb promoter (H2-c-fos). Splenic B cells from Mx-c-fos mice were cultured with LPS and rIL-4, and IgG1+ B cells were developed in the culture after day 3. When IFN-α/β was added to the culture from day 2, development of IgG1+ B cells was perturbed, and the number of apoptotic cells increased within 24 h, suggesting that c-Fos induces apoptosis in Ig class-switching B cells. To confirm the effect of c-Fos on B cell differentiation in vivo, H2-c-fos mice were immunized With DNP-OVA. The mice produced primary IgM, but not IgG, anti-DNP Ab in serum and failed to generate germinal centers in spleen. The perturbation of germinal center formation in H2-c-fos mice was rescued by mating them with transgenic mice carrying the bcl-2 gene with the Ig promoter. However, primary IgG1 anti-DNP Ab production was still suppressed in doubly transgenic mice, suggesting that Bcl-2 can delay the time of c-Fos-induced apoptosis in Ig class-switching B cells but cannot rescue the death. Since c-Fos is induced in mature B cells reacted with Ags, and clonal deletion of self-reactive B cells in germinal centers is insensitive to Bcl-2, these results suggest that c-Fos plays a causal role in clonal deletion of germinal center B cells.