We studied the possibility of optimizing the DNA transfection properties of carriers based on lysine dendrimers of the third and the fifth generation, including those containing a chloroacetyl or a lipophilic palmitoyl moiety at C-end. The use of lysosome-destroying antibiotic chloroquine and an amphipathic polycationic nonadecapeptide JTS-1 was found to enhance the DNA transfecting properties of the lysine dendrimers. The triple complex including DNA, a lysine dendrimer of the third generation modified with lipophylic moieties of palmitic acid at its C-end, and JTS-1 was shown to be comparable in its transfecting activity to a complex containing Escort, a commercial cationic liposome carrier.
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