| Abstract: | Inclusion of some glycosides, gangliosides and ceruloplasmin into large (300-400 nm in diameter) unilamellar liposomes was performed. About 100% of the gangliosides, 30-50% of ceruloplasmin and 3-5% of the glycosides were incorporated into the phospholipid vesicles under these conditions. The liposomes containing ceruloplasmin or gangliosides, in contrast to the glycoside-containing vesicles, were precipitated in the presence of agglutinin from Ricinus communis. The interaction of phospholipid vesicles containing gangliosides with rat hepatocytes "in vitro" was studied. It was found that the incorporation of gangliosides into the liposomal membrane increased the liposomal lipid uptake by 50% as can be judged from the uptake of radioactive cholesterol. Possible mechanisms of incorporation of carbohydrate-containing compounds into liposomes are discussed. It is concluded that beside the density of carbohydrates the degree of their exposure on the liposomal membrane is important for specific interactions of the vesicles with lectins. |
