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*
Division of Pulmonary and Critical Care Medicine, University of Michigan, and
Department of Veterans Affairs Medical Center, Ann Arbor, MI 48105; and
Division of Pulmonary Biology, Childrens Hospital, Cincinnati, OH 45229
Innate immunity plays an important role in pulmonary host defense
against Pneumocystis carinii, an important pathogen in
individuals with impaired cell-mediated immunity. We investigated the
role of GM-CSF in host defense in a model of P. carinii
pneumonia induced by intratracheal inoculation of CD4-depleted mice.
Lung GM-CSF levels increased progressively during the infection and
were significantly greater than those in uninfected controls 3, 4, and
5 wk after inoculation. When GM-CSF gene-targeted mice
(GM-/-) depleted of CD4+ cells were
inoculated with P. carinii, the intensities of infection
and inflammation were increased significantly compared with those in
CD4-depleted wild-type mice. In contrast, transgenic expression of
GM-CSF directed solely in the lungs of GM-/- mice (using
the surfactant protein C promoter) dramatically decreased the intensity
of infection and inflammation 4 wk after inoculation. The
concentrations of surfactant proteins A and D were greater in both
uninfected and infected GM-/- mice compared with those in
wild-type controls, suggesting that this component of the innate
response was preserved in the GM-/- mice. However,
alveolar macrophages (AM) from GM-/- mice demonstrated
impaired phagocytosis of purified murine P. carinii
organisms in vitro compared with AM from wild-type mice. Similarly, AM
production of TNF-
in response to P. carinii in vitro
was totally absent in AM from GM-/- mice, while
GM-CSF-replete mice produced abundant TNF in this setting. Thus, GM-CSF
plays a critical role in the inflammatory response to P.
carinii in the setting of impaired cell-mediated immunity
through effects on AM activation.
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