期刊
FRONTIERS IN IMMUNOLOGY
卷 9, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2018.00160
关键词
marginal zone B cell; Fc mu receptor; tonic BCR signal; apoptosis; humoral immune response
类别
资金
- National Basic Research Program of China [2015CB943300]
- National Natural Science Foundation of China [81373129, 81571529]
- Development Project of Shanghai Peak Disciplines-Integrative Medicine [20150407]
- Japan Society for the Promotion of Science [17K08878]
- Grants-in-Aid for Scientific Research [17K08878] Funding Source: KAKEN
The marginal zone B cells (MZB) are located at the interface between the circulation and lymphoid tissue and as a gatekeeper play important roles in both innate and adaptive immune responses. We have previously found that MZB are significantly reduced in mice deficient in the IgM Fc receptor (Fc mu R) but how Fc mu R regulates the development and function of MZB remains unknown. In this study, we found that both marginal zone precursor (MZP) and MZB were decreased in Fc mu R-/- mice. The reduction of MZP and MZB was not due to impaired proliferation of these cells but rather due to their increased death. Further analysis revealed that Fc mu R-/- MZB had reduced tonic BCR signal, as evidenced by their decreased levels of phosphorylated SYK and AKT relative to WT MZB. MZB in Fc mu R-/- mice responded poorly to LPS in vivo when compared with MZB in WT mice. Consistent with the reduced proportion of MZB and their impaired response to LPS, antibody production against the type 1 T-independent Ag, NP-LPS, was significantly reduced in Fc mu R-/- mice. Moreover, Fc mu R-/- mice were highly susceptible to Citrobacter rodentium-induced sepsis. These results reveal a critical role for Fc mu R in the survival and activation of MZB and in protection against acute bacterial infection.
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