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• W2078840294 abstract "1 Exposure of tissues to endotoxin (LPS) and/or cytokines leads to the induction of both inducible nitric oxide synthase (iNOS) and cyclo-oxygenase-2 (COX-2). It has previously been reported that there is ‘cross-talk’ between these two systems. However, such previous studies have been limited by the availability of highly selective inhibitors. Here we have investigated the interactions between iNOS and COX-2 in vivo using 1400W, an iNOS-selective inhibitor, and celecoxib, a COX-2-selective inhibitor. 2 Infusion of LPS to rats for 6 h caused a time-dependent increase in the plasma concentrations of 6 keto-prostaglandin F1α (6 keto-PGF1α) and nitrite/nitrate (NO2/NO3), consistent with the induction of iNOS and COX-2. Bolus injection of arachidonic acid (AA) at t=6 h resulted in a further increase of circulating levels of 6 keto-PGF1α in LPS-treated animals. 3 Treatment of rats with 1400W or the non-selective NOS inhibitor NG-monomethyl-L-arginine (L-NMMA) inhibited the increase in plasma NO2/NO3 but were both without effect on the plasma concentration of 6 keto-PGF1α before or after AA. 4 Treatment with the non-steroidal anti-inflammatory drugs (NSAIDs), A771726 or diclofenac, or with celecoxib significantly reduced the increase in circulating 6 keto-PGF1α caused by LPS, and the large increase in 6 keto-PGF1α following injection of AA. None of the COX inhibitors affected the increase in plasma NO2/NO3. Dexamethasone, however, significantly inhibited both the increase in 6 keto-PGF1α and the increase in NO2/NO3. 5 In conclusion, the use of selective inhibitors does not support the concept of cross talk in vivo between iNOS and COX-2. British Journal of Pharmacology (1998) 125, 335–340; doi:10.1038/sj.bjp.0702077" @default.
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• W2078840294 date "1998-09-01" @default.
• W2078840294 modified "2023-09-26" @default.
• W2078840294 title "Interactions between inducible isoforms of nitric oxide synthase and cyclo-oxygenase<i>in vivo</i>: investigations using the selective inhibitors, 1400W and celecoxib" @default.
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• W2078840294 doi "https://doi.org/10.1038/sj.bjp.0702077" @default.
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