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• W2000803362 abstract "Under certain pathological conditions, e.g., infectious or neoplastic diseases, application of ozone exerts therapeutic effects. However, pharmacological mechanisms are not understood. Since an interaction with the arachidonic acid metabolism is suggested we investigated the effect of intraperitoneal insufflation of ozone on prostanoid system in vivo. Upon ozone application (4 mg/kg) to rats we observed an approximate 3-fold increase in excretion rate of 6-keto-prostaglandin (PG) F1α and of 2,3-dinor-6-keto-PGF1α, the measurable stable products of prostacyclin. In plasma and vessel tissue 6-keto-PGF1α concentration was also significantly increased. In contrast, excretion rates for PGE2 and thromboxane (TX) B2 did not change. F2-isoprostanes, regarded as endogenous indicators of oxidative stress, were also unaffected by ozone application. Oxygen insufflation used as control was without any effect on prostanoid levels. Ozone caused increase in 6-keto-PGF1α by arterial but not by venous vessel tissues with peak activity 6–9 h following insufflation. The increase in PGI2 synthesis was dependent on cyclooxygenase (COX)-2 activity, demonstrated by its sensitivity towards COX-2 inhibition, and by enhanced COX-2 mRNA and protein expression in vessels. Ozone exerted no rise in excretion rate of prostacyclin metabolites in COX-2−/− but in COX-1−/− mice. Enzymatic activity and mRNA expression of vascular PGI2 synthase (PGIS) was unaffected by ozone treatment. In summary our study shows for the first time that ozone insufflation causes enhanced expression of COX-2 in the vessel system leading to exclusive elevation of systemic PGI2 levels. We assume that PGI2 stimulation may contribute to the beneficial effects of ozone treatment." @default.
• W2000803362 created "2016-06-24" @default.
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• W2000803362 date "2012-02-01" @default.
• W2000803362 modified "2023-10-13" @default.
• W2000803362 title "Ozone induces synthesis of systemic prostacyclin by cyclooxygenase-2 dependent mechanism in vivo" @default.
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• W2000803362 doi "https://doi.org/10.1016/j.bcp.2011.11.025" @default.
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