In:
Infection and Immunity, American Society for Microbiology, Vol. 73, No. 9 ( 2005-09), p. 5628-5635
Kurzfassung:
Bovine NK cells have recently been characterized and the present study describes the interaction between NK cells, antigen-presenting cells, and secreted mycobacterial proteins. Gamma interferon (IFN-γ) production by NK cells was seen in approximately 30% of noninfected calves in response to the Mycobacterium tuberculosis complex-specific protein ESAT-6, MPP14 from Mycobacterium avium subsp. paratuberculosis , and purified protein derivative (PPD) from M. tuberculosis . In contrast, no response was induced by MPB70, which is another M. tuberculosis complex-specific secreted antigen. The production of IFN-γ by NK cells in whole blood in response to ESAT-6 and MPP14 was demonstrated using intracellular staining together with surface labeling for the NK cell-specific receptor, NKp46, or CD3. Furthermore, the depletion of NK cells from peripheral blood mononuclear cells completely abolished the IFN-γ production. The response was mediated through stimulation of adherent cells and was largely independent of contact between adherent cells and the NK cells. Neutralization of interleukin-12 only partly inhibited IFN-γ production, showing that other cytokines were also involved. The demonstration of NK cell-mediated IFN-γ production in young cattle provides an explanation for the nonspecific IFN-γ response frequently encountered in young cattle when using the IFN-γ test in diagnosis of mycobacterial infections.
Materialart:
Online-Ressource
ISSN:
0019-9567
,
1098-5522
DOI:
10.1128/IAI.73.9.5628-5635.2005
Sprache:
Englisch
Verlag:
American Society for Microbiology
Publikationsdatum:
2005
ZDB Id:
1483247-1
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