| First Author | Hagge DA | Year | 2014 |
| Journal | PLoS Negl Trop Dis | Volume | 8 |
| Issue | 9 | Pages | e3149 |
| PubMed ID | 25210773 | Mgi Jnum | J:317658 |
| Mgi Id | MGI:6843763 | Doi | 10.1371/journal.pntd.0003149 |
| Citation | Hagge DA, et al. (2014) IL-10 and NOS2 modulate antigen-specific reactivity and nerve infiltration by T cells in experimental leprosy. PLoS Negl Trop Dis 8(9):e3149 |
| abstractText | BACKGROUND: Although immunopathology dictates clinical outcome in leprosy, the dynamics of early and chronic infection are poorly defined. In the tuberculoid region of the spectrum, Mycobacterium leprae growth is restricted yet a severe granulomatous lesion can occur. The evolution and maintenance of chronic inflammatory processes like those observed in the leprosy granuloma involve an ongoing network of communications via cytokines. IL-10 has immunosuppressive properties and IL-10 genetic variants have been associated with leprosy development and reactions. METHODOLOGY/PRINCIPAL FINDINGS: The role of IL-10 in resistance and inflammation in leprosy was investigated using Mycobacterium leprae infection of mice deficient in IL-10 (IL-10-/-), as well as mice deficient in both inducible nitric oxide synthase (NOS2-/-) and IL-10 (10NOS2-/-). Although a lack of IL-10 did not affect M. leprae multiplication in the footpads (FP), inflammation increased from C57Bl/6 (B6)<IL-10-/-<NOS2-/-<10NOS2-/-. While IL-10-/- mice exhibited modest FP induration compared to B6, NOS2-/- and 10NOS2-/- mice developed markedly enlarged FP marking distinct phases: early (1 month), peak (3-4 months), and chronic (8 months). IFN-gamma-producing CD4+CD44+ cells responding to M. leprae cell wall, membrane, and cytosol antigens and ML2028 (Ag85B) were significantly increased in the evolved granuloma in NOS2-/- FP compared to B6 and IL-10-/- during early and peak phases. In 10NOS2-/- FP, CD4+CD44+ and especially CD8+CD44+ responses were augmented even further to these antigens as well as to ML0380 (GroES), ML2038 (bacterioferritin), and ML1877 (EF-Tu). Moreover, fragmented nerves containing CD4+ cells were present in 10NOS2-/- FP. CONCLUSIONS/SIGNIFICANCE: The 10NOS2-/- strain offers insight on the regulation of granuloma formation and maintenance by immune modulators in the resistant forms of leprosy and presents a new model for investigating the pathogenesis of neurological involvement. |
