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J. Virol., 07 1996, 4411-4418, Vol 70, No. 7
N Baumgarth and A Kelso
Influenza virus infection induces the local production of gamma interferon
(IFN-gamma) by T cells and non-T cells in the respiratory tract. To
elucidate the possible functions of this cytokine, the humoral and local
cellular immune responses to influenza virus were studied in BALB/c mice
with or without in vivo neutralization of IFN- gamma by using monoclonal
antibodies. Neutralization of IFN-gamma led to a significant reduction in
virus-specific titers of immunoglobulins G2a and G3 in serum but had little
effect on other isotypes. Studies on cells isolated from the lung
parenchyma itself revealed that at the height of the immune response the
ability of these cells to produce cytokines after antigen or T-cell
receptor/CD3 stimulation was not affected. Ex vivo cytolytic activity by
lung parenchyma cells, which is induced by infection with this virus in
normal mice, was also found to be undisturbed by this treatment, even
though anti-IFN-gamma antibody activity was recovered from lung lavage
samples and sera at all days studied. Surprisingly, in vivo neutralization
of IFN-gamma led to a significant reduction in the magnitude of the
cellular infiltrate in the lung tissue which followed infection, suggesting
an involvement of IFN-gamma in the mechanisms that regulate increased
leucocyte traffic in the inflamed lung parenchyma. This conclusion was
supported by findings of differences between mock-treated and
anti-IFN-gamma-treated mice in the number of CD8+ lung T cells expressing
CD49d (alpha4- integrin) and CD62L at various times after influenza virus
infection. This study therefore demonstrates that IFN-gamma affects the
local cellular response in the respiratory tract as well as the systemic
humoral response to influenza virus infection.
Copyright © 1996, American Society for Microbiology
In vivo blockade of gamma interferon affects the influenza virus- induced humoral and the local cellular immune response in lung tissue
Cooperative Research Center for Vaccine Technology and Transplantation Biology Unit, Queensland Institute of Medical Research, Brisbane, Queensland, Australia. nicoleB@qimr.edu.au
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