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. 1993 Feb;84(2):120–127. doi: 10.1111/j.1349-7006.1993.tb02844.x

Inhibitory Effects of Inhibitors of Arachidonic Acid Metabolism on the Evolution of Rat Liver Preneoplastic Foci into Nodules and Hepatocellular Carcinomas with or without Phenobarbital Exposure

Qing Tang 1, Ayumi Denda 1,✉, Toshifumi Tsujiuchi 1, Masahiro Tsutsumi 1, Toshihiro Amanuma 1, Yoshiaki Murata 1, Hiroshi Maruyama 1, Yoichi Konishi 1
PMCID: PMC5919133  PMID: 8463129

Abstract

Effects of inhibitors of arachidonic acid (AA) metabolism on the evolution of preneoplastic foci into nodules and of nodules into hepatocellular carcinomas were examined in F344 male rat livers with or without phenobarbital (PB) exposure. p‐Bromophenacyl bromide (BPB), acetylsalicylic acid (ASA), and quercetin (QU) were used as inhibitors of phospholipase A2, cyclooxygenase and lipoxygenase, respectively. Preneoplastic liver foci were induced by initiation with N‐nitrosodiethylamine (200 mg/kg, i.p.) followed by selection using the procedure of Cayama et al. For the nodule experiment, starting 1 week after completion of the selection procedure, animals bearing foci were given diets containing 0.05% PB plus 0.75, 1, or 1.5% of one of the inhibitors, 0.05% PB alone, or 0.75, 1 or 1.5% of inhibitor alone, or basal diet for 9 weeks. For the carcinoma experiment, 3 weeks after completion of the selection procedure, animals bearing nodules were given the same diets mentioned above for 29 weeks. BPB, ASA and QU either with or without PB accelerated the remodeling of preneoplastic foci, significantly decreasing the numbers of persistent nodules and hyperplastic nodules. ASA either with or without PB significantly decreased the number of hepatocellular carcinomas per rat. BPB and QU, however, significantly decreased the numbers of hepatocellular carcinomas with but not without PB. The results suggested an involvement of AA metabolism in the process of evolution of preneoplastic foci into nodules and hepatocellular carcinomas in rat liver with or without PB exposure.

Keywords: Arachidonic acid metabolism, Inhibitor, Hepatocarcinogenesis, Phenobarbital, F344 rat

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