1,720,983 research outputs found

    HEPATIC GLUCOSE-6-PHOSPHATE DEHYDROGENASE, CHOLESTERO-GENESIS AND SERUM LIPOPROTEINS IN LIVER REGENERATION AFTER PARTIAL HEPATECTOMY

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    Liver regeneration after partial hepatectomy was used as an experimental model for studying mammalian cell division and replication. The rate of cell proliferation in this hyperplastic model was correlated with hepatic de novo synthesis of cholesterol, with the hexose monophosphate shunt pathway of glucose metabolism, and with serum lipoproteins. An increase of hepatic cholesterol esters and of incorporation of tritiated water in cholesterol esters was observed at 24 hr after partial hepatectomy. Partial hepatectomy also resulte

    Inhibition of cholesterol esterification in the control of leukemia proliferation in vitro

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    The results showed a highly significant reduction of proliferation rate in leukemia cells treated with each cholesterol esterification inhibitor. This effect was not caused by cell toxicity, as cell morphology and viability were unaffected at the concentrations of inhibitors used. In addition, it appears that changes in the cholesterol biosynthetic pathway are not responsible for the antiproliferative effect observed, being cholesterol synthesis unaffected in leukemia cells with reduced activity of cholesterol esterification. The inhibition of cell proliferation was associated with a reduction of ACAT and MDR1 mRNA expression and conversely with an up-regulation of p-53 protein expression (p53 not shown). Our results imply that cholesterol esters and MDR1 could play a role in the dynamic processes of lipid transport inside the cells. ACAT inhibitors, by reducing cellular cholesterol esters and MDR1 gene expression and through these pathways the proliferation rate of leukemia cells, may warrant consideration as innovative targeted anticancer agents
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