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Publication : PD-1 deletion restores susceptibility to experimental autoimmune encephalomyelitis in miR-155-deficient mice.

First Author  Zhang J Year  2014
Journal  Int Immunol Volume  26
Issue  7 Pages  407-15
PubMed ID  24648472 Mgi Jnum  J:331331
Mgi Id  MGI:6843514 Doi  10.1093/intimm/dxu043
Citation  Zhang J, et al. (2014) PD-1 deletion restores susceptibility to experimental autoimmune encephalomyelitis in miR-155-deficient mice. Int Immunol 26(7):407-15
abstractText  MiR-155 (-/-) mice are highly resistant to experimental autoimmune encephalomyelitis (EAE), while Pdcd1 (-/-) mice develop a more severe form of the disease. To determine the conflicting roles of these two molecules in the disease, we generated miR-155 (-/-) Pdcd1 (-/-) double knockout (DKO) mice. We found that ablation of programmed cell death protein 1 (PD-1) expression in miR-155-deficient mice restored the susceptibility to EAE. The increased severity of the disease in DKO mice was accompanied by an enhanced T-cell infiltration into the brain as well as an increased production of pro-inflammatory cytokines IFN-gamma and IL-17. Furthermore, the major contribution of the DKO to EAE was T-cell intrinsic since adoptive transfer of CD4(+) T cells from DKO donors promoted the disease in lymphopenic recipients. These results define PD-1 deficiency in miR-155 (-/-) mice as a promoting factor of autoimmune inflammation by increasing antigen-driven T-cell expansion and infiltration.
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