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B on septic lung in mice
1Department of Anesthesiology and Critical Care Medicine, 2Department of Pharmacology, and 3Department of Biochemistry, Hokkaido University Graduate School of Medicine, and 4Division of Cancer Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-8638, Japan
Submitted 6 May 2004 ; accepted in final form 27 July 2004
Nuclear factor-
B (NF-
B) plays a key role in regulating expression of several genes involved in the pathophysiology of endotoxic shock. We investigated whether in vivo introduction of synthetic double-stranded DNA with high affinity for the NF-
B binding site could block expression of genes mediating pulmonary vascular permeation and thereby provide effective therapy for septic lung failure. Endotoxic shock was induced by an intravenous injection of 10 mg/kg Escherichia coli endotoxin in mice. We introduced NF-
B decoy oligodeoxynucleotide (ODN) in vivo 1 h after endotoxic shock by using a gene transfer kit. At 10 h, blood samples were collected for measurement of histamine and for blood-gas analysis. Gene and protein expression levels of target molecules were determined by means of Northern and Western blot analyses, respectively. The transpulmonary flux of 125I-labeled albumin was used as an index of lung vascular permeability. Administration of endotoxin caused marked increases in plasma histamine and gene and protein expressions of histidine decarboxylase, histamine H1 receptors, and inducible nitric oxide synthase in lung tissues. Elevated lung vascular permeability was also found. Blood-gas analysis showed concurrent decreases in arterial PO2, PCO2, and pH. All of these events induced by endotoxin were significantly inhibited by transfection of NF-
B decoy ODN but not by its mutated (scrambled) form (used as a control). Our results indicate for the first time the potential usefulness of NF-
B decoy ODN for gene therapy of endotoxic shock.
gene therapy; histamine; histidine decarboxylase; histamine H1 receptor; nitric oxide synthase; lung failure; endotoxic shock
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