کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2167937 | 1092362 | 2009 | 11 صفحه PDF | دانلود رایگان |

Mycobacterium tuberculosis and M. bovis BCG infect APCs. In vitro, mycobacteria inhibit IFN-gamma-induced MHC-II expression by macrophages, but the effects of mycobacteria on lung APCs in vivo remain unclear. To assess MHC-II expression on APCs infected in vivo, mice were aerosol-infected with GFP-expressing BCG. At 28 d, ∼1% of lung APCs were GFP+ by flow cytometry and CFU data. Most GFP+ cells were CD11bhigh/CD11cneg-mid lung macrophages (58–68%) or CD11bhigh/CD11chigh DCs (28–31%). Lung APC MHC-II expression was higher in infected mice than naïve mice. Within infected lungs, however, MHC-II expression was lower in GFP+ cells than GFP− cells for both macrophages and DCs. MHC-II expression was also inhibited on purified lung macrophages and DCs that were infected with BCG in vitro. Thus, lung APCs that harbor mycobacteria in vivo have decreased MHC-II expression relative to uninfected APCs from the same lung, possibly contributing to evasion of T cell responses.
Journal: Cellular Immunology - Volume 254, Issue 2, 2009, Pages 94–104