| First Author | Turner J | Year | 2004 |
| Journal | Mech Ageing Dev | Volume | 125 |
| Issue | 1 | Pages | 1-9 |
| PubMed ID | 14706232 | Mgi Jnum | J:121050 |
| Mgi Id | MGI:3709149 | Doi | 10.1016/j.mad.2003.09.002 |
| Citation | Turner J, et al. (2004) The expression of early resistance to an infection with Mycobacterium tuberculosis by old mice is dependent on IFN type II (IFN-gamma) but not IFN type I. Mech Ageing Dev 125(1):1-9 |
| abstractText | Old mice can express a transient early resistance to infection with M. tuberculosis that requires the presence of CD8 T cells within the lungs. Further characterization of those CD8 T cells within the aged lung established that the majority of CD8 T cells from old mice expressed the IL-15 receptor (CD122) in combination with bright expression of CD44 (CD44(hi)), and were capable of producing IFN-gamma after T cell receptor cross-linking. It has been previously described that CD8 CD44(hi) T cells proliferate in response to IFN-I, acting via IL-15, and therefore we determined whether IFN-I signaling could be a participant in the response of CD8 T cells within the lungs of old mice infected with M. tuberculosis. We demonstrate here that IFN-I signaling was required for the expansion of CD8 T cells within the aging lung in response to infection with M. tuberculosis, but that IFN-I signaling had no influence on the capacity of old mice to express early resistance to an infection with M. tuberculosis. Resident CD8 T cells were still however capable of producing IFN-gamma, which we demonstrate here to be critical in the expression of early resistance, suggesting that the expression of early resistance requires the participation, but not expansion, of the CD8 T cell pool within the aging lung. |
