| First Author | Tan Q | Year | 2018 |
| Journal | JCI Insight | Volume | 3 |
| Issue | 1 | PubMed ID | 29321370 |
| Mgi Jnum | J:283260 | Mgi Id | MGI:6386853 |
| Doi | 10.1172/jci.insight.95882 | Citation | Tan Q, et al. (2018) Activation-induced cytidine deaminase deficiency accelerates autoimmune diabetes in NOD mice. JCI Insight 3(1) |
| abstractText | B cells play an important role in type 1 diabetes (T1D) development. However, the role of B cell activation-induced cytidine deaminase (AID) in diabetes development is not clear. We hypothesized that AID is important in the immunopathogenesis of T1D. To test this hypothesis, we generated AID-deficient (AID-/-) NOD mice. We found that AID-/-NOD mice developed accelerated T1D, with worse insulitis and high levels of anti-insulin autoantibody in the circulation. Interestingly, neither maternal IgG transferred through placenta, nor IgA transferred through milk affected the accelerated diabetes development. AID-/-NOD mice showed increased activation and proliferation of B and T cells. We found enhanced T-B cell interactions in AID-/-NOD mice, with increased T-bet and IFN-gamma expression in CD4+ T cells in the presence of AID-/- B cells. Moreover, excessive lymphoid expansion was observed in AID-/-NOD mice. Importantly, antigen-specific BDC2.5 CD4+ T cells caused more rapid onset of diabetes when cotransferred with AID-/- B cells than when cotransferred with AID+/+ B cells. Thus, our study provides insights into the role of AID in T1D. Our data also suggest that AID is a negative regulator of immune tolerance and ablation of AID can lead to exacerbated islet autoimmunity and accelerated T1D development. |
