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- W2150698686 endingPage "1935" @default.
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- W2150698686 abstract "The effects of inhibitors of arachidonic acid metabolism and antioxidants on the rat liver tumor promotion activity of phenobarbital (PB) were assessed using the enzyme-altered focus as the end-point lesion. Fischer 344 male rats were initiated with N-nitrosodiethylamine (200 mg/kg) and then divided into five groups placed on basal diet, diet containing 0.05% PB, diet containing 0.05% PB plus 0.75%, 1% or 1.5% levels of various inhibitors of arachidonic acid metabolism or antioxidants, or diet containing 1% or 1.5% inhibitors or antioxidants alone for 10 weeks, and then killed. ρ-Bromo phenacyl bromide, an inhibitor of phospholipase A2 signifi cantly inhibited the promotion activity of PB at dose levels of 0.75% and 1.5%, reaching plateau at 0.75%. Both quercetin, an inhibitor of lipoxygenase, and morin, a dual inhibitor of lipoxygenase-cyclooxygenase, significantly reduced the promotion activity of PB at the 1.5% but not 0.75% dose levels. Moreover, acetylsalicylic acid, an inhibitor of cyclooxygenase dose-dependently inhibited the promotion activity of PB. Among the antioxidants investigated, vitamin E did not affect, but n-propyl gallate and ethoxyquin exerted a dose-dependent inhibition of PB promotion. These results are strongly suggestive of an involvement of phospholipase A2 lipoxygenase and cyclooxygenase arachidonic acid metabolic pathways in the mechanisms underlying PB enhancement of hepatocarcinogenesis." @default.
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- W2150698686 date "1989-01-01" @default.
- W2150698686 modified "2023-10-14" @default.
- W2150698686 title "Possible involvement of arachidonic acid metabolism in phenobarbital promotion of hepatocarcinogenesis" @default.
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- W2150698686 doi "https://doi.org/10.1093/carcin/10.10.1929" @default.
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