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• W2133202671 abstract "This report describes the development and evaluation of a range of polyethyleneglycol and polyethyleneglycol-peptide liposome formulations that effectively target liver in vivo. A 19-amino-acid sequence from the N-terminal region of the circumsporozoite protein of Plasmodium berghei was attached to the distal end of di22:1-aminopropane-polyethyleneglycol(3400), and incorporated into liposomes containing di22:1-phosphatidylcholine and di22:1-phosphatidylethanolamine-polyethyleneglycol(5000). By systematically varying the mole fractions of both the lipid-polyethyleneglycol and the lipid-polyethyleneglycol-peptide conjugates, and screening for serum-induced aggregation in vitro, a serum-stable range of formulations was established. These stable formulations were tested for binding to Hepa 1-6 liver cells in culture, and from these results three formulations were prepared for intravenous administration in mice. All three formulations exhibited effective liposome targeting to the liver, with approximately 80% of the total injected dose recovered in the liver within 15 min. Uptake by liver cells was more than 600-fold higher than uptake by those in the heart, and more than 200-fold higher than uptake by lung or kidney cells. Effective targeting to liver in vivo was successful after repeated (up to three) administrations to the host at 14-day intervals. All formulations prepared for in vivo administration were stable in the presence of serum, as measured by complete retention of entrapped calcein dye. The formulation with the lowest mole fractions of peptide and polyethyleneglycol was the most cost-effective in terms of encapsulation efficiency and minimal use of peptide and polymer compounds. The in vitro biophysical screening, followed by cell culture testing, reduced the number of animals required to develop an effective set of targeted liposome formulations for in vivo application." @default.
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• W2133202671 date "2008-01-01" @default.
• W2133202671 modified "2023-10-17" @default.
• W2133202671 title "Liposomal Polyethyleneglycol and Polyethyleneglycol-Peptide Combinations for Active Targeting to Liver<i>In Vivo</i>" @default.
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• W2133202671 doi "https://doi.org/10.1080/10717540802006211" @default.
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