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mediates hemorrhage-induced acute lung
injury via p55 TNF receptor
1 Department of Surgery and 2 Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262
Acute lung injury after hemorrhagic shock
(HS) is associated with the expression of tumor necrosis factor
(TNF)-
in the lung. However, the role of TNF-
and its receptors
in this pulmonary disorder remains obscure. This study examined the
temporal relationship of pulmonary TNF-
production to neutrophil
accumulation during HS and determined the role of TNF-
in neutrophil
accumulation and lung leak. HS was induced in mice by removal of 30%
of total blood volume. Lung TNF-
was measured by ELISA. Neutrophil
accumulation was detected by immunofluorescent staining, and
microvascular permeability was assessed using Evans blue dye. Although
HS induced a slight and transient increase in lung TNF-
, neutrophil
accumulation preceded the increase in TNF-
. However, lung neutrophil
accumulation and lung leak were abrogated in TNF-
knockout mice, and
both were restored by administration of recombinant TNF-
to TNF-
knockout mice before HS. Neutrophil accumulation and lung leak were
abrogated in mice lacking the p55 TNF-
receptor, but neither was
influenced by p75 TNF-
receptor knockout. This study demonstrates that a low level of pulmonary TNF-
is sufficient to mediate
HS-induced acute lung injury during HS and that the p55 TNF-
receptor plays a dominant role in regulating the pulmonary inflammatory
response to HS.
gene knockout; neutrophils; microvascular permeability; mouse; tumor necrosis factor-
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