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The Effects of Nuclear Factor-κB Decoy Oligodeoxynucleotide on Lipopolysaccharide-Induced Direct Acute Lung Injury
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Abstract
Background: The pathophysiologic mechanisms of early acute lung injury (ALI) differ according to the type of primary insult. It is important to differentiate between direct and indirect pathophysiologic pathways, and this may influence the approach to treatment strategies. NF-κB decoy oligodeoxynucleotide (ODN) is a useful tool for the blockade of the expression of NF-κB-dependent proinflammatory mediators and has been reported to be effective in indirect ALI. The purpose of this study was to investigate the effect of NF-κB decoy ODN in the lipopolysaccharide (LPS)-induced direct ALI model. Methods: Five-week-old specific pathogen-free male BALB/c mice were used for the experiment. In the preliminary studies, tumor necrosis factor (TNF)-α, interleukine (IL)-6 and NF-κB activity peaked at 6 hours after LPS administration. Myeloperoxidase (MPO) activity and ALI score were highest at 36 and 48 hours, respectively. Therefore, it was decided to measure each parameter at the time of its highest level. The study mice were randomly divided into three experimental groups: (1) control group which was administered 50 μL of saline and treated with intratracheal administration of 200 μL DW containing only hemagglutinating virus of Japan (HVJ) vector (n=24); (2) LPS group in which LPS-induced ALI mice were treated with intratracheal administration of 200 μL DW containing only HVJ vector (n=24); (3) LPS＋ODN group in which LPS-induced ALI mice were treated with intratracheal administration of 200 μL DW containing 160 μg of NF-κB decoy ODN and HVJ vector (n=24). Each group was subdivided into four experimental subgroups: (1) tissue subgroup for histopathological examination for ALI at 48 hours (n=6); (2) 6-hour bronchoalveolar lavage (BAL) subgroup for measurement of TNF-α and IL-6 in BAL fluid (BALF) (n=6); (3) 36-hour BAL subgroup for MPO activity assays in BALF (n=6); and (4) tissue homogenate subgroup for measurement of NF-κB activity in lung tissue homogenates at 6 hours (n=6). Results: NF-κB decoy ODN treatment significantly decreased NF-κB activity in lung tissues. However, it failed to improve the parameters of LPS-induced direct ALI, including the concentrations of tumor necrosis factor-α and interleukin-6 in BALF, myeloperoxidase activity in BALF and histopathologic changes measured by the ALI score. Conclusion: NF-κB decoy ODN, which has been proven to be effective in indirect models, had no effect in the direct ALI model.
- keywords
- Acute lung injury, Lipopolysaccharides, Inflammation, Nuclear factor kappa B, Oligodeoxynucleotides
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