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• W2104002854 endingPage "804" @default.
• W2104002854 startingPage "795" @default.
• W2104002854 abstract "Changes in lipid metabolism were monitored in rat hepatocyte nodules at certain time points over 9 months. Tissue obtained from partially hepatectomized rats, collected over a period of 7 days, were included as a control for normal hepatocyte cell proliferation. Two important features regarding the lipid profiles of hepatocyte nodules and normal regenerating liver were the increased concentrations of phosphatidylethanolamine (PE), resulting in a decreased phosphatidylcholine/phosphatidylethanolamine (PC/PE) ratio, and cholesterol. These changes coincided with increased membrane fluidity in the nodules and regenerating liver. With respect to the fatty acid (FA) profiles of the nodules, C18:1omega9 and C18:2omega6 increased in PE and PC whereas C20:4omega6 decreased in PC and increased in PE. C22:5omega6 and C22:6omega3, the end products of the omega6 and omega3 metabolic pathways, respectively, decreased in PC and remained unchanged in PE. The FA levels in PC reflected an impaired delta-6 desaturase enzyme, whereas this effect was masked in PE due to the increased concentration of this phospholipid fraction. In regenerating liver, the FA profiles of PC and PE showed the same pattern as described for the hepatocyte nodules, except for C18:1omega9 which decreased in PC and increased non-significantly in PE. The increased C18:1omega9 level, a FA with anti-oxidative properties, as well as the decreased levels of the long-chain polyunsaturated fatty acids (C20 and C22 carbon chains), have been associated with the decreased lipid peroxidation level in hepatocyte nodules. The resultant decrease in peroxidative metabolites, known to affect apoptosis, could be important in the progression of the nodules into neoplasia. The present results indicate that the altered lipid parameters associated with hepatocyte nodules closely mimics cellular proliferation in regenerating liver and could be responsible for the enhanced proliferation and/or altered growth pattern in these lesions. The altered FA profiles suggest various pathways in which FA could play a role in transmembrane signalling related to the altered cell proliferative and apoptotic pathways. The persistent changes in the hepatocyte nodules suggest that the lipid metabolism escapes the regulatory mechanisms required for normal cellular homeostasis at different levels." @default.
• W2104002854 created "2016-06-24" @default.
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• W2104002854 date "2001-05-01" @default.
• W2104002854 modified "2023-10-12" @default.
• W2104002854 title "Changes in essential fatty acid patterns associated with normal liver regeneration and the progression of hepatocyte nodules in rat hepatocarcinogenesis" @default.
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• W2104002854 doi "https://doi.org/10.1093/carcin/22.5.795" @default.
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