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A plasmid containing the rat preproinsulin I gene was entrapped in large liposomes and intravenously administered to rats. Four hours after inoculation, the livers were processed for the isolation of hepatocytes. Kupffer cells, and endothelial cells, DNA was purified, and the exogenous DNA was detected in the different cell DNA preparations by Southern blotting. By using liposomes consisting of phospholipids and cholesterol, Kupffer cells were shown to be, on a per cell basis, the primary target for gene incorporation. In an attempt to target the liposomes to other liver cells, a glycolipid, lactosylceramide, was included in the lipid bilayer of the liposomes; this resulted in a substantial increase in the proportion of the exogenous gene in the hepatocytes and mainly in the endothelial cells, with a simultaneous decrease of this proportion in the Kupffer cells. Thus, it is shown that inclusion of a specific glycolipid within the bilayer of the liposomes may direct the DNA-containing vesicles to specific cell types in the liver.

Targeted and nontargeted liposomes for in vivo transfer to rat liver cells of a plasmid containing the preproinsulin I gene.