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Department of Cell and Molecular Biology, Section for Immunology, Lund University, Lund, Sweden
This study examines innate immunity to oral
Salmonella during primary infection and after secondary
challenge of immune mice. Splenic NK and NKT cells plummeted early
after primary infection, while neutrophils and macrophages (M
)
increased 10- and 3-fold, respectively. In contrast, immune animals had
only a modest reduction in NK cells, no loss of NKT cells, and a slight
increase in phagocytes following secondary challenge. During primary
infection, the dominant sources of IFN-
were, unexpectedly,
neutrophils and M
, the former having intracellular stores of IFN-
that were released during infection. IFN-
-producing phagocytes
greatly outnumbered IFN-
-producing NK cells, NKT cells, and T cells
during the primary response. TNF-
production was also dominated by
neutrophils and M
, which vastly outnumbered NKT cells producing this
cytokine. Neither T cells nor NK cells produced TNF-
early during
primary infection. The TNF-
response was reduced in a secondary
response, but remained dominated by neutrophils and M
. Moreover, no
significant IFN-
production by M
was associated with the
secondary response. Indeed, only NK1.1+ cells and T cells
produced IFN-
in these mice. These studies provide a coherent view
of innate immunity to oral Salmonella infection, reveal
novel sources of IFN-
, and demonstrate that immune status influences
the nature of the innate response.
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