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- W2033710082 abstract "We investigated the intrahepatic distribution in rats of liposomes of 85 or 130 nm diameter, which were sterically stabilized with a polyethylene glycol) derivative of phosphatidylethanolamine (PEG-PE) so as to increase their circulation time in blood. Various times after intravenous injection of radiolabeled ([3H-]cholesterylether) liposomes, parenchymal and non-parenchymal cells of the liver were isolated and their radioactivity content was determined. Control liposomes of 85 nm without PEG-PE distributed in an approximately 80:20 ratio to hepatocytes (H) and macrophages (M), respectively; the 130-nm control liposomes showed a 50:50 H/M distribution. Incorporation of PEG-PE reduced the rate of total liver uptake about 4-fold for liposomes of either size and shifted the H/M ratio to 60:40 for the smaller vesicles and to 40:60 for the larger ones. For both liposome sizes, PEG-PE apparently causes a shift in intrahepatic distribution in favor of the macrophages. It is concluded that PEG-PE has a stronger inhibitory effect on liposome uptake by hepatocytes than on uptake by macrophages. Attempts to shift liposome uptake more in favor of hepatocytes, by incorporation of lactosylceramide, failed. This compound, although causing an increase in hepatic uptake, particularly for the 130-nm liposomes, shifted the H/M ratio further towards the macrophages. We conclude that the galactose moiety of the glycolipid is sufficiently exposed on the surface of (PEG-PE)-containing liposomes to allow interaction with the galactose-binding lectin at the surface of the liver macrophage and that the extent of exposure is dependent on vesicle size." @default.
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- W2033710082 title "Intrahepatic Distribution of Long-Circulating Liposomes Containing Polyethylene Glycol) Distearoyl Phosphatidylethanolamine" @default.
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- W2033710082 doi "https://doi.org/10.3109/08982109409037038" @default.
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