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*
Laboratory of Host Defense, Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, Nagoya, Japan; and
Department of Bacteriology, National Institute of Infectious Diseases, Tokyo, Japan
To investigate the immunomodulating effects of IL-15 in vivo on
mycobacterial infection, we used IL-15-transgenic (Tg) mice, which were
recently constructed with cDNA-encoding secretable isoform of IL-15
precursor protein under the control of a MHC class I promoter. The
IL-15-Tg mice exhibited resistance against infection with
Mycobacterium bovis bacillus Calmette-Guérin
(BCG), as assessed by bacteria growth. IFN-
level in serum was
significantly higher in IL-15-Tg mice than in non-Tg mice after BCG
infection. NK cells were remarkably increased, and Ag-specific T
cytotoxic 1 response mediated by CD8+ T cells
producing IFN-
was significantly augmented in the IL-15-Tg mice
following BCG infection. Neutralization of endogenous IFN-
by in
vivo administration of anti-IFN-
mAb deteriorated the
clearance of the bacteria. Depletion of of NK cells or CD8+
T cells by invivo administration of
anti-asialo-GM1 Ab or anti-CD8 mAb hampered the
exclusion of bacteria. Thus, overexpression of IL-15 in vivo enhanced
protection against BCG infection via augmentation of NK and T cytotoxic
1 responses.
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