| First Author | Imahashi N | Year | 2023 |
| Journal | Front Immunol | Volume | 14 |
| Pages | 1215478 | PubMed ID | 37409131 |
| Mgi Jnum | J:346960 | Mgi Id | MGI:7505936 |
| Doi | 10.3389/fimmu.2023.1215478 | Citation | Imahashi N, et al. (2023) MR1 deficiency enhances IL-17-mediated allergic contact dermatitis. Front Immunol 14:1215478 |
| abstractText | Major histocompatibility complex (MHC) class Ib molecules present antigens to subsets of T cells primarily involved in host defense against pathogenic microbes and influence the development of immune-mediated diseases. The MHC class Ib molecule MHC-related protein 1 (MR1) functions as a platform to select MR1-restricted T cells, including mucosal-associated invariant T (MAIT) cells in the thymus, and presents ligands to them in the periphery. MAIT cells constitute an innate-like T-cell subset that recognizes microbial vitamin B(2) metabolites and plays a defensive role against microbes. In this study, we investigated the function of MR1 in allergic contact dermatitis (ACD) by examining wild-type (WT) and MR1-deficient (MR1(-/-)) mice in which ACD was induced with 2,4-dinitrofluorobenzene (DNFB). MR1(-/-) mice exhibited exaggerated ACD lesions compared with WT mice. More neutrophils were recruited in the lesions in MR1(-/-) mice than in WT mice. WT mice contained fewer MAIT cells in their skin lesions following elicitation with DNFB, and MR1(-/-) mice lacking MAIT cells exhibited a significant increase in IL-17-producing alphabeta and gammadelta T cells in the skin. Collectively, MR1(-/-) mice displayed exacerbated ACD from an early phase with an enhanced type 3 immune response, although the precise mechanism of this enhancement remains elusive. |
