Abstract：
:Sublethal doses of LPS result in increased tolerance to high concentrations of oxygen and this is associated with decreased pulmonary inflammation in a rat model. To investigate the mechanism of decreased neutrophil influx into the lung in this model, we measured levels of mRNA in the lung for the endothelial adhesion molecules, E-selectin and P-selectin. Immunostaining for E-selectin protein was also done in rat lungs, as well as measurement of soluble L-selectin in the blood. These levels were measured in the lungs of adult rats injected with 0.5 mg/kg LPS or placebo at 0 and 24 h and exposed to > 95% O2 for 60 h. Oxygen exposure resulted in significant increases in both E- and P-selectin mRNA and in E-selectin protein after 60 h. LPS resulted in an early rise in E-selectin protein followed by a decline to less than control (saline/O2) levels at 60 h. Messenger RNA for E-selectin followed a similar trend, although there were no differences at 60 h between LPS and control groups exposed to O2. P-selectin mRNA expression did not significantly differ between LPS and control O2 groups. Soluble L-selectin levels decreased by 6 h after LPS infusion and were significantly lower than saline/O2 controls through 24 h, suggesting binding to endothelium. In conclusion, the decrease in E-selectin expression on the surface of pulmonary endothelium after LPS could contribute to decreased inflammation in this model of oxygen toxicity. Soluble L-selectin may serve a further anti-inflammatory role after LPS infusion by binding to pulmonary endothelium.
journal_name
Inflammationjournal_title
Inflammationauthors
Thompson LR,Keeney SE,Tarrant D,Rudloff E,Dallas DV,Schmalstieg FCdoi
10.1023/b:ifla.0000039561.37868.91keywords:
subject
Has Abstractpub_date
2004-06-01 00:00:00pages
147-57issue
3eissn
0360-3997issn
1573-2576journal_volume
28pub_type
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