Entrapment of plasmid DNA in liposomes.

The entrapment of plasmid DNA (pMB9) and high molecular weight DNA into large unilamellar liposomes is described. The entrapment of DNA is specific and due to encapsulation of DNA into the aqueous compartment of liposomes. The entrapped Dna, resistant to deoxyribonuclease treatment, could be reisolated from liposomes intact and, as has been shown by transformation assay, it remains biologically active. The advantages of our method and possible applications are discussed.