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in ischemia and reperfusion
injury in rat lungs
1 Department of Physiology,
College of Medicine, University of South Alabama, Mobile, Alabama
36688; 2 Department of Physiology,
The effects of
both recombinant rat tumor necrosis factor-
(TNF-
) and an
anti-TNF-
antibody were studied in isolated buffer-perfused rat
lungs subjected to either 45 min of nonventilated
[ischemia-reperfusion (I/R)] or air-ventilated
(
/R) ischemia followed by 90 min of reperfusion and ventilation. In the I/R group, the vascular
permeability, as measured by the filtration coefficient
(Kfc),
increased three- and fivefold above baseline after 30 and 90 min of
reperfusion, respectively (P < 0.001). Over the same time intervals, the
Kfc for the
/R group increased five- and tenfold above baseline values, respectively (P < 0.001).
TNF-
measured in the perfusates of both ischemic models
significantly increased after 30 min of reperfusion. Recombinant rat
TNF-
(50,000 U), placed into perfusate after baseline measurements,
produced no measurable change in microvascular permeability in control
lungs perfused over the same time period (135 min), but I/R injury was
significantly enhanced in the presence of TNF-
. An anti-TNF-
antibody (10 mg/rat) injected intraperitoneally into rats 2 h before
the lung was isolated prevented the microvascular damage in lungs
exposed to both I/R and
/R (P < 0.001). These results indicate
that TNF-
is an essential component at the cascade of events that
cause lung endothelial injury in short-term I/R and
/R models of lung ischemia.
cytokines; microvascular permeability
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