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Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262
Acute lung injury is
characterized by accumulation of neutrophils in the lungs, accompanied
by the development of interstitial edema and an intense inflammatory
response. To assess the role of neutrophils as early immune effectors
in hemorrhage- or endotoxemia-induced lung injury, mice were made
neutropenic with cyclophosphamide or anti-neutrophil antibodies.
Endotoxemia- or hemorrhage-induced lung edema was significantly reduced
in neutropenic animals. Activation of the transcriptional regulatory
factor nuclear factor-
B after hemorrhage or endotoxemia was
diminished in the lungs of neutropenic mice compared with
nonneutropenic controls. Hemorrhage or endotoxemia was followed by
increases in pulmonary mRNA and protein levels for interleukin-1
(IL-1
), macrophage inflammatory protein-2 (MIP-2), and tumor
necrosis factor-
(TNF-
). Endotoxin-induced increases in
proinflammatory cytokine expression were greater than those found after
hemorrhage. The amounts of mRNA or protein for IL-1
, MIP-2, and
TNF-
were significantly lower after hemorrhage in the lungs of
neutropenic versus nonneutropenic mice. Neutropenia was associated with
significant reductions in IL-1
and MIP-2 but not in TNF-
expression in the lungs after endotoxemia. These experiments show that
neutrophils play a centrol role in initiating acute inflammatory
responses and causing injury in the lungs after hemorrhage or endotoxemia.
cytokines; nuclear factor-
B; interleukin-1
; tumor necrosis
factor-
; macrophage inflammatory protein-2
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