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2010 ; 84
(24
): 12564-75
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Suppression of innate immune pathology by regulatory T cells during Influenza A
virus infection of immunodeficient mice
#MMPMID20943986
Antunes I
; Kassiotis G
J Virol
2010[Dec]; 84
(24
): 12564-75
PMID20943986
show ga
The viral infection of higher vertebrates elicits potent innate and adaptive host
immunity. However, an excessive or inappropriate immune response also may lead to
host pathology that often is more severe than the direct effects of viral
replication. Therefore, several mechanisms exist that regulate the magnitude and
class of the immune response. Here, we have examined the potential involvement of
regulatory T (Treg) cells in limiting pathology induced by influenza A virus
(IAV) infection. Using lymphocyte-deficient mice as hosts, we showed that Treg
cell reconstitution resulted in a significant delay in weight loss and prolonged
survival following infection. The adoptively transferred Treg cells did not
affect the high rate of IAV replication in the lungs of lymphocyte-deficient
hosts, and therefore their disease-ameliorating effect was mediated through the
suppression of innate immune pathology. Mechanistically, Treg cells reduced the
accumulation and altered the distribution of monocytes/macrophages in the lungs
of IAV-infected hosts. This reduction in lung monocytosis was associated with a
specific delay in monocyte chemotactic protein-2 (MCP-2) induction in the
infected lungs. Nevertheless, Treg cells failed to prevent the eventual
development of severe disease in lymphocyte-deficient hosts, which likely was
caused by the ongoing IAV replication. Indeed, using T-cell-deficient mice, which
mounted a T-cell-independent B cell response to IAV, we further showed that the
combination of virus-neutralizing antibodies and transferred Treg cells led to
the complete prevention of clinical disease following IAV infection. Taken
together, these results suggested that innate immune pathology and virus-induced
pathology are the two main contributors to pathogenesis during IAV infection.