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Am J Physiol Lung Cell Mol Physiol 274: L26-L31, 1998;
1040-0605/98 $5.00
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Vol. 274, Issue 1, L26-L31, January 1998

Grain dust-induced lung inflammation is reduced by Rhodobacter sphaeroides diphosphoryl lipid A

Paul J. Jagielo1, Timothy J. Quinn1, Nilofer Qureshi2, and David A. Schwartz1

1 Department of Internal Medicine, The University of Iowa College of Medicine, Iowa City, Iowa 52242-1081; and 2 Department of Bacteriology, The University of Wisconsin, William S. Middleton Memorial Veteran's Hospital, Madison, Wisconsin 53705-2254

To further determine the importance of endotoxin in grain dust-induced inflammation of the lower respiratory tract, we evaluated the efficacy of pentaacylated diphosphoryl lipid A derived from the lipopolysaccharide of Rhodobacter sphaeroides (RsDPLA) as a partial agonist of grain dust-induced airway inflammation. RsDPLA is a relatively inactive compound compared with lipid A derived from Escherichia coli (LPS) and has been demonstrated to act as a partial agonist of LPS-induced inflammation. To assess the potential stimulatory effect of RsDPLA in relation to LPS, we incubated THP-1 cells with RsDPLA (0.001-100 µg/ml), LPS (0.02 µg endotoxin activity/ml), or corn dust extract (CDE; 0.02 µg endotoxin activity/ml). Incubation with RsDPLA revealed a tumor necrosis factor (TNF)-alpha stimulatory effect at 100 µg/ml. In contrast, incubation with LPS or CDE resulted in TNF-alpha release at 0.02 µg/ml. Pretreatment of THP-1 cells with varying concentrations of RsDPLA before incubation with LPS or CDE (0.02 µg endotoxin activity/ml) resulted in a dose-dependent reduction in the LPS- or CDE-induced release of TNF-alpha with concentrations of RsDPLA of up to 10 µg/ml but not at 100 µg/ml. To further understand the role of endotoxin in grain dust-induced airway inflammation, we utilized the unique LPS inhibitory property of RsDPLA to determine the inflammatory response to inhaled CDE in mice in the presence of RsDPLA. Ten micrograms of RsDPLA intratracheally did not cause a significant inflammatory response compared with intratracheal saline. However, pretreatment of mice with 10 µg of RsDPLA intratracheally before exposure to CDE (5.4 and 0.2 µg/m3) or LPS (7.2 and 0.28 µg/m3) resulted in significant reductions in the lung lavage concentrations of total cells, neutrophils, and specific proinflammatory cytokines compared with mice pretreated with sterile saline. These results confirm the LPS-inhibitory effect of RsDPLA and support the role of endotoxin as the principal agent in grain dust causing airway inflammation.

endotoxin; lipopolysaccharide inhibition; asthma


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