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• W2045101167 abstract "A minor component of chromatin, the phospholipid fraction, changes during cell cycle as result of the activation of intranuclear lipid metabolism enzymes including phosphatidylcholine-dependent phospholipase C activity. It is known that this enzyme may be activated by phosphatidylcholine plasmalogen (Plg). Until now, there has been little evidences for the presence of Plgs inside the nucleus. The aim of our study is to ascertain if they are present in the nucleus and are responsible of the activation of phosphatidylcholine-dependent phospholipase C during cell proliferation and apoptosis. Therefore, we have analysed the Plg composition of the whole homogenate, cytosol, nuclei and chromatin of hepatocytes. The phosphatidylcholine-dependent phospholipase C activity was assayed using both phosphatidylcholine and plasmalogenyl-phosphatidylcholine as substrates. Our results show, for the first time, that Plgs are present in chromatin and the plasmalogenyl-phosphatidylcholine stimulates the phosphatidylcholine-dependent phospholipase C activity more than phosphatidylcholine. Finally, in order to verify the possible role of these molecules during cell proliferation and apoptosis, we used liver of rats fed with ciprofibrate which stimulates hepatocytes proliferation during the treatment and, after withdrawal, apoptosis. After 3 days of ciprofibrate treatment, the chromatin plasmalogenyl-phosphatidylcholine increases as well as the phosphatidylcholine-dependent phospholipase C activity. After drug withdrawal, when the hepatocytes undergo to apoptosis, the plasmalogenyl-phosphatidylcholine content together with phosphatidylcholine-dependent phospholipase C activity decreases. Therefore, it can be concluded that plamalogens are present in the chromatin, and probably may have a function both in regulating phosphatidylcholine dependent phospholipase C and cell cycle." @default.
• W2045101167 created "2016-06-24" @default.
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• W2045101167 date "2004-01-01" @default.
• W2045101167 modified "2023-09-27" @default.
• W2045101167 title "Plasmalogens in rat liver chromatin: New molecules involved in cell proliferation" @default.
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• W2045101167 doi "https://doi.org/10.1002/jcp.20086" @default.
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