期刊
JOURNAL OF IMMUNOLOGY
卷 189, 期 7, 页码 3472-3479出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1200649
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资金
- Ministry of Education, Culture, Sports, Science and Technology
- Advanced Education Program for Integrated Clinical, Basic and Social Medicine, Graduate School of Medical Sciences, Kumamoto University (Program for Enhancing Systematic Education in Graduate Schools,)
- Program of Founding Research Centers for Emerging and Reemerging Infectious Diseases
- Global Center of Excellence program (Global Education and Research Center Aiming at the control of AIDS), Kumamoto University
- Grants-in-Aid for Scientific Research [23791116, 24659224, 23390122] Funding Source: KAKEN
Signals through BCR and costimulatory molecules play essential roles in selecting high-affinity B cells with Ig V-region mutations in the germinal centers (GCs) of peripheral lymphoid organs. Lyn-deficient (lyn(-/-)) mice show impaired BCR signal triggering for cell proliferation and GC formation, causing hyper-IgM, and display autoimmunity after aging. In this study, we demonstrate that Lyn-mediated signaling to upregulate GANP is essential for the survival of mature GC-like (mGC) B cells with high-affinity type BCR mutations upon Ag immunization. Transgenic ganp expression into lyn(-/-) mice did not recover the Lyn-deficient phenotype with regard to B cell differentiation, serum Igs, and impaired GC formation in spleens after immunization with nitrophenylchicken gamma-globulin, but it markedly rescued cell survival of mGC B cells by suppressing DNA damage, thereby increasing the frequency of the Trp(33)-to-Leu mutation in the IgV(H)-186.2 region and affinity maturation of nitrophenyl-binding B cells. GANP may play a critical role in Lyn-mediated signaling for the selection of high-affinity B cells in peripheral lymphoid organs. The Journal of Immunology, 2012, 189: 3472-3479.
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