Uptake of liposomes which incorporate a glycopeptide fraction of asialofetuin by HepG(2) cells

Kallinteri, Paraskevi and Papadimitriou, Evangelia and Antimisiaris, Sophia G. (2001) Uptake of liposomes which incorporate a glycopeptide fraction of asialofetuin by HepG(2) cells. Journal of Liposome Research, 11 (2-3). pp. 175-193. ISSN 0898-2104. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1081/LPR-100108461

Abstract

We examined the interaction between liposomes which incorporate a fraction triantennary glycopeptide (AF) of asialofetuin and human hepatoma cells (HepG(2)) in vitro. HepG(2) cells are known to express the asialoglycoprotein receptor. For liposome preparation AF, was cleaved from asialofetuin, purified and conjugated with different length (C-12 C-16 and C-18) fatty acids (FA). ne conjugates were subsequently incorporated into pre-formed sonicated liposomes using a mild cholate incubation method. Interactions between AF(2)/ FA-liposomes as well as control-liposomes (with no ligand) and cells (in the presence of serum) were measured at different lipid doses after incubating HepG(2) cells with liposomes at 4 degreesC and 37 degreesC, in the absence and presence of galactose, and also evaluated by fluorescence microscopy. More extensive studies were performed with the AF(2)/C-18-Liposomes which were previously found to incorporate higher amounts of ligand and be the most stable of the formulations prepared. Results from both, morphological and quantitative studies, demonstrate that AF(2)/C-16 and especially AF(2)/C-18-liposomes are bound and taken up by the cells by a galactose specific mechanism. The AF(2)/C-12-liposomes-which were previously found to incorporate low amounts of ligand in a non-stable way-were taken up by the cells in amounts similar to those of the control liposomes (without ligand) while this uptake was not reduced by galactose and therefore possibly non-specific. The intracellular localization of AF(2)/C-18-liposomes was further evidenced by intracellular acidification using NH4Cl. These conclusions. justify the importance of further in vivo studies in order to demonstrate the capability of the proposed system to target hepatocytes.

Item Type: Article
Additional information: 496RK Times Cited:2 Cited References Count:39
Uncontrolled keywords: fetuin liposome hepg(2) cells asialoglycoprotein receptor targeting hepatic asialoglycoprotein receptor labeled liposomes rabbit hepatocytes high-affinity binding endocytosis assay line galactosides glycosides
Subjects: R Medicine > RS Pharmacy and materia medica
Divisions: Faculties > Science Technology and Medical Studies > Medway School of Pharmacy
Depositing User: Paraskevi Kallinteri
Date Deposited: 27 May 2009 15:25
Last Modified: 08 Apr 2014 08:27
Resource URI: http://kar.kent.ac.uk/id/eprint/18612 (The current URI for this page, for reference purposes)
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