| Title | Intracellular delivery of membrane-impermeable hydrophilic molecules to a hepatoblastoma cell line by asialoglycoprotein-labeled liposomes. | | Author(s) | Yu HY, Lin JH | | Institution | School of Pharmacy, College of Medicine, National Taiwan University, 1 Jen-Ai Road, Section 1, Taipei, Taiwan. | | Source | J Formos Med Assoc 2000 Dec; 99(12):936-41. | | MeSH | 3T3 Cells
Animals
Asialoglycoproteins
Cell Membrane Permeability
Drug Carriers
Humans
Inulin
Liposomes
Liver Neoplasms, Experimental
Mice
Research Support, Non-U.S. Gov't
Tumor Cells, Cultured
| | Abstract | BACKGROUND AND PURPOSE: Mammalian hepatic receptors are specific for the terminal D-galactose of desialylated glycoproteins. This study used asialofetuin-labeled liposomes (AF-liposomes) to target hepatoma cells using this receptor mechanism, and investigated their efficiency in intracellular delivery of membrane-impermeable hydrophilic molecules to a hepatoblastoma cell line (HepG2).
METHODS: Inulin was used as a model molecule. Blank liposomes consisting of phosphatidylcholine:phosphatidic acid:cholesterol in 6:1:6 molar ratio were prepared. Palmitoyl-asialofetuin was anchored onto the blank liposomes using a detergent dialysis method. 3H-inulin was entrapped in the AF-liposomes by dehydration (freeze-drying) and rehydration followed by freeze-thaw sonication. Plain liposomes (N-liposomes) were prepared by the same process but without AF. HepG2 cells were incubated for 3 hours with free 3H-inulin, N-liposomal 3H-inulin, AF-liposomal 3H-inulin, or free AF. The cellular uptake of 3H-inulin and the cell viability were then determined. Uptake of AF-liposomes in a non-hepatoma cell line, NIH3T3, was also studied for comparison.
RESULTS: Cellular uptake of free inulin was negligible while uptake of liposomal inulin, either in N-liposomes or in AF-liposomes, was significant (p < 0.01). The uptake of AF-liposomal inulin was significantly higher than that of N-liposomal inulin in HepG2 cells but not in NIH3T3 cells. Free AF and blank AF-liposomes inhibited the HepG2 cell uptake of AF-liposomal inulin.
CONCLUSIONS: These results indicate that AF-liposomes enhanced intracellular delivery of a membrane-impermeable hydrophilic drug into hepatoma cells by a receptor mechanism. AF-liposomes are a potential drug carrier for intracellular delivery of membrane-impermeable hydrophilic drugs to HepG2 cells. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 11155748 |
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