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Mice primed with Mycobacterium bovis bacillus Calmette-Guérin (BCG) are highly sensitive to lipopolysaccharide (LPS)-induced liver injury and lethality. We found that interleukin-15 (IL-15) transgenic (Tg) mice primed with BCG were more susceptible to LPS-induced liver injury than non-Tg mice. The numbers of CD44+ CD8+ T cells expressing intracellular gamma interferon (IFN-gamma) significantly increased in the livers of BCG-primed IL-15 Tg mice after LPS injection, and the depletion of CD8+ T cells from BCG-primed IL-15 Tg mice completely abolished the susceptibility to LPS-induced lethality. Liver T cells from BCG-primed IL-15 Tg mice produced IFN-gamma in vitro in response to LPS, which was inhibited by the addition of anti-IL-12 monoclonal antibody (MAb). In vivo treatment with anti-IL-12 MAb inhibited the appearance of CD44+ CD8+ T cells expressing intracellular IFN-gamma after LPS injection. These results suggest that the overexpression of IL-15 increases susceptibility to LPS-induced liver injury in BCG-primed mice via bystander activation of CD8+ T cells.

infection and immunity

Overexpression of Interleukin-15 Increases Susceptibility to Lipopolysaccharide-Induced Liver Injury in Mice Primed with <i>Mycobacterium bovis</i> Bacillus Calmette-Guérin

Overexpression of Interleukin-15 Increases Susceptibility to Lipopolysaccharide-Induced Liver Injury in Mice Primed with Mycobacterium bovis Bacillus Calmette-Guérin