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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Virol
1997 ; 71
(12
): 9450-7
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Alveolar macrophages regulate the induction of primary cytotoxic T-lymphocyte
responses during influenza virus infection
#MMPMID9371606
Wijburg OL
; DiNatale S
; Vadolas J
; van Rooijen N
; Strugnell RA
J Virol
1997[Dec]; 71
(12
): 9450-7
PMID9371606
show ga
Virus-specific cytotoxic T lymphocytes (CTL) are thought to be responsible for
the eradication of respiratory influenza virus infections by direct cytolysis of
virus-infected epithelial cells. In this study, we provide evidence for a role
for alveolar macrophages (AM) in the regulation of pulmonary virus-specific CTL
responses. Prior to infection with influenza virus, AM were selectively
eliminated in vivo with a liposome-mediated depletion technique, and
virus-specific CTL activities of lung and mediastinal lymph node (MLN) cells were
assayed ex vivo and compared with those for normal mice. AM depletion resulted in
increased primary CTL responses and changed the kinetics of the CTL response.
Flow cytometric analysis of lung and MLN cells showed that the percentage of CD8+
cells was not altered after AM depletion and that lung cells from AM-depleted
mice had an increased capacity to lyse virus-infected cells. Upon restimulation
in vitro, virus-specific CTL activity in lung cells of normal mice was similar to
that in lung cells of AM-depleted mice. Furthermore, elimination of AM resulted
in increased virus titers in the lung, but virus clearance as a function of time
was not affected. Our results show that AM regulate virus-specific CTL responses
during respiratory influenza virus infection by removing viral particles, by
downregulating the priming and activity of CTL in MLN cells, and by inhibiting
the expansion of virus-specific CTL in the lung.