Alteration in heme oxygenase-1 and nitric oxide synthase-2 gene expression during endotoxemia in cyclooxygenase-2-deficient mice

Antioxidants & Redox Signaling
Kuniaki Ejima, Mark A Perrella

Abstract

Sepsis is a systemic inflammatory response to a blood-borne infection that is associated with an extremely high rate of morbidity and mortality. The present article reviews our recent studies involving the role of cyclooxygenase (COX)-2 in host responses to bacterial endotoxemia and its role in the regulation of nitric oxide synthase (NOS)2 and heme oxygenase (HO)-1. COX-2-deficient (-/-) mice display a blunted and delayed induction of the cytokine-inducible genes NOS2 and HO-1 after administration of Escherichia coli lipopolysaccharide (LPS or endotoxin). Translocation and activation of transcription factors important for signaling events during an inflammatory response, such as nuclear factor-kappaB and activating protein-1, are also reduced. In addition, COX-2(-/-) mice have reduced leukocyte infiltration into critical organs (kidneys and lungs) after LPS administration. Interestingly, the absence of COX-2 does not alter the LPS induction of several proinflammatory cytokines in tissue macrophages, but induction of the antiinflammatory cytokine interleukin-10 is exaggerated. After LPS administration, 50% of wild-type (+/+) mice die; however, COX-2(-/-) mice display a dramatic improvement in survival during endotoxemia. Taken ...Continue Reading

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