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- W2097480577 abstract "Recent evidence shows that the activation of heme oxygenase (HO) within the CNS is associated with increased prostanoid production. In this study, we investigated whether changes in HO activity induced by pharmacological manipulation are associated with parallel variations in cyclo-oxygenase (COX) activity and prostaglandin production in an in vitro paradigm of CNS cells, i.e. primary cultures of rat cortical astrocytes. Pharmacological tools commonly used to induce changes in HO activity, namely the HO enhancers hemin and CoCl(2) as well as the HO inhibitor Sn-mesoporphyrin-9 (SnMP9), were tested in our model, and the variations in COX activity associated with the above treatments were monitored by measuring a COX end product, prostaglandin E2 (PGE2), released into the incubation medium. We found that the increase in HO activity induced by hemin and/or CoCl(2) was not consistently associated with increases in prostaglandin production, whereas HO inhibition by SnMP9 was normally followed by a decrease in PGE2 release. The above effect was observed after both acute (30 min) and prolonged (24 hr) incubations, suggesting that baseline HO activity contributes to the maintenance of normal PG production in this model. Experiments with the stable HO end products biliverdin and bilirubin suggest that these products may play a role in mediating HO-induced COX activation." @default.
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- W2097480577 date "2001-02-01" @default.
- W2097480577 modified "2023-10-17" @default.
- W2097480577 title "A functional link between heme oxygenase and cyclo-oxygenase activities in cortical rat astrocytes11Abbreviations: BR, bilirubin; BV, biliverdin; CHX, cycloheximide; CO, carbon monoxide; COX, cyclo-oxygenase; HO, heme oxygenase; INDO, indomethacin; LDH, lactate dehydrogenase; MEM, modified Eagle’s medium; PGE2, prostaglandin E2; and SnMP9, Sn-mesoporphyrin-9." @default.
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- W2097480577 doi "https://doi.org/10.1016/s0006-2952(00)00582-7" @default.
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