Co-induction of nitric oxide synthase and cyclo-oxygenase: interactions between nitric oxide and prostanoids.
1. Lipopolysaccharide (LPS) co-induces nitric oxide synthase (iNOS) and cyclo-oxygenase (COX-2) in J774.2 macrophages. Here we have used LPS-activated J774.2 macrophages to investigate the effects of exogenous or endogenous nitric oxide (NO) on COX-2 in both intact and broken cell preparations. NOS activity was assessed by measuring the accumulation of nitrite using the Griess reaction. COX-2 activity was assessed by measuring the formation of 6-keto-prostaglandin F1 alpha (6-keto-PGF1 alpha) by radioimmunoassay. Western blot analysis was used to determine the expression of COX-2 protein. We have also investigated whether endogenous NO regulates the activity and/or expression of COX in vivo by measuring NOS and COX activity in the lung and kidney, as well as release of prostanoids from the perfused lung of normal and LPS-treated rats. 2. Incubation of cultured murine macrophages (J774.2 cells) with LPS (1 microgram ml-1) for 24 h caused a time-dependent accumulation of nitrite and 6-keto-PGF1 alpha in the cell culture medium which was first significant after 6 h. The formation of both 6-keto-PGF1 alpha and nitrite elicited by LPS was inhibited by cycloheximide (1 microM) or dexamethasone (1 microM). Western blot analysis showed that J774.2 macrophages contained COX-2 protein after LPS administration, whereas untreated cells contained no COX-2. 3. The accumulation of 6-keto-PGF1 alpha in the medium of LPS-activated J774.2 macrophages was concentration-dependently inhibited by chronic (24 h) exposure to sodium nitroprusside (SNP; 1-1000 microM).(ABSTRACT TRUNCATED AT 250 WORDS)[1]References
- Co-induction of nitric oxide synthase and cyclo-oxygenase: interactions between nitric oxide and prostanoids. Swierkosz, T.A., Mitchell, J.A., Warner, T.D., Botting, R.M., Vane, J.R. Br. J. Pharmacol. (1995) [Pubmed]
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