| First Author | Liu J | Year | 2018 |
| Journal | Front Immunol | Volume | 9 |
| Pages | 160 | PubMed ID | 29459869 |
| Mgi Jnum | J:318498 | Mgi Id | MGI:6859897 |
| Doi | 10.3389/fimmu.2018.00160 | Citation | Liu J, et al. (2018) Fcmicro Receptor Promotes the Survival and Activation of Marginal Zone B Cells and Protects Mice against Bacterial Sepsis. Front Immunol 9:160 |
| abstractText | 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 (FcmuR) but how FcmuR 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 FcmuR(-/-) 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 FcmuR(-/-) MZB had reduced tonic BCR signal, as evidenced by their decreased levels of phosphorylated SYK and AKT relative to WT MZB. MZB in FcmuR(-/-) 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 FcmuR(-/-) mice. Moreover, FcmuR(-/-) mice were highly susceptible to Citrobacter rodentium-induced sepsis. These results reveal a critical role for FcmuR in the survival and activation of MZB and in protection against acute bacterial infection. |
