Liposomes in Immunology: Multilamellar Phosphatidylcholine Liposomes as a Simple, Biodegradable and Harmless Adjuvant Without any Immunogenic Activity of its own

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Abstract
Multilamellar phosphatidylcholine liposomes were coated with the antigens human serum albumin (HSA) or bovine gamma globulin (BGG) simply by suspending the liposomes in a solution of the antigens. Antigen coated phosphatidylcholine liposomes showed nearly the same adjuvant activity after intravenous injection as liposomes of a more complex phospholipid composition. Since phosphatidylcholine liposomes are biodegradable, harmless, easily obtainable, have no immunogenic activity of their own and may be administered intravenously, they seem to be a promising immunoadjuvant.