| First Author | Kim C | Year | 2019 |
| Journal | Cell Rep | Volume | 29 |
| Issue | 8 | Pages | 2202-2216.e5 |
| PubMed ID | 31747595 | Mgi Jnum | J:296481 |
| Mgi Id | MGI:6467854 | Doi | 10.1016/j.celrep.2019.10.044 |
| Citation | Kim C, et al. (2019) Defects in Antiviral T Cell Responses Inflicted by Aging-Associated miR-181a Deficiency. Cell Rep 29(8):2202-2216.e5 |
| abstractText | Generation of protective immunity to infections and vaccinations declines with age. Studies in healthy individuals have implicated reduced miR-181a expression in T cells as contributing to this defect. To understand the impact of miR-181a expression on antiviral responses, we examined LCMV infection in mice with miR-181ab1-deficient T cells. We found that miR-181a deficiency delays viral clearance, thereby biasing the immune response in favor of CD4 over CD8 T cells. Antigen-specific CD4 T cells in mice with miR-181a-deficient T cells expand more and have a broader TCR repertoire with preferential expansion of high-affinity T cells than in wild-type mice. Importantly, generation of antigen-specific miR-181a-deficient CD8 effector T cells is particularly impaired, resulting in lower frequencies of CD8 T cells in the liver even at time points when the infection has been cleared. Consistent with the mouse model, CD4 memory T cells in individuals infected with West Nile virus at older ages tend to be more frequent and of higher affinity. |
