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- W2189625217 abstract "The proteins associated with liposomes in the circulation of mice were analyzed in order to determine whether bound proteins significantly influence the fate of liposomes in vivo. Liposomes were administered intravenously via the dorsal tail vein of CD1 mice and were isolated from blood after 2 min in the absence of coagulation inhibitors using a rapid “spin column” procedure. Various negatively charged liposomes exhibiting markedly different clearance properties were studied; notably, these included liposomes containing 10 mol % ganglioside GMl which has been previously shown to effectively limit liposomal uptake by the fixed macrophages of the reticuloendothelial system. The protein binding ability (PB; g of protein/mol of lipid) of the liposomes was quantitated and related to the circulation half-life (T~/~) of the liposomes. Liposomes having similar membrane surface charge imparted by different anionic phospholipids were found to exhibit markedly different protein binding potentials. Furthermore, PB values determined from the in vivo experiments were found to be inversely related to circulation half-lives. PB values in excess of 50 g of protein/ mol of lipid were observed for rapidly cleared liposomes such as those containing cardiolipin or phosphatidic acid (T~/~ 2 h) were significantly less (PB <I5 g of total protein/mol of total lipid). PB values were also determined for liposomes recovered from in vitro incubations with isolated human serum; relative PB values obtained from these in vitro experiments were in agreement with relative PB values measured from in vivo experiments. PB values, therefore, could be a useful parameter for predicting the clearance behavior of liposomes in the circulation. Liposomes exhibiting increased PB values in vivo were shown by immunoblot analysis to bind more immune opsonins, leading to a higher probability of phagocytic uptake. Finally, based on results obtained using the in vitro system, it is suggested that the mechanism by which ganglioside GM~ prolongs the murine circulation halflife of liposomes is by reducing the total amount of blood protein bound to the liposomes in a relatively nonspecific manner." @default.
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- W2189625217 date "1992-01-01" @default.
- W2189625217 modified "2023-09-27" @default.
- W2189625217 title "Association of Blood Proteins with Large Unilamellar Liposomes" @default.
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