Abstract
The complexation of DNA with a dendrimer with the successive addition of the dendrimer solution to the solution of DNA leads to the appearance and accumulation of compact particles with a diameter of D h = 100 ± 10 nm that coexist with particles whose dimensions coincide with those of free DNA molecules (D h = 450 ± 50 nm). The fraction of large particles decreases regularly; moreover, when the equimolar ratio of charged groups of interacting components is achieved, these particles disappear. The coexistence of practically free DNA molecules and a compact soluble negatively charged complex is confirmed by a sedimentation assay. Further addition of the dendrimer up to a certain ratio of charged groups of the components, much higher than unity, brings about phase separation, while at a large excess of charge groups of the dendrimer (above fivefold), the system turns out to be fully single-phase and composed of compact (110 ± 10 nm) cationic soluble complexes. Owing to the positive charge and small size of complex particles no greater than a critical value of 150 nm, the particles possess an important ability to interact with a positively charged cell membrane and to enter a living cell via endocytosis.
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Original Russian Text © N.V. Kuchkina, T.V. Laptinskaya, N.V. Tsvetkov, A.L. Rusanov, V.A. Izumrudov, Z.B. Shifrina, 2010, published in Vysokomolekulyarnye Soedineniya, Ser. C, 2010, Vol. 52, No. 7, pp. 1341–1347.
This work was supported by the Russian Foundation for Basic Research, project nos. 07-03-00220 and 07-03-00228.
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Kuchkina, N.V., Laptinskaya, T.V., Tsvetkov, N.V. et al. Formation of soluble complexes of cationic polypyridylphenylene dendrimers with DNA. Polym. Sci. Ser. C 52, 105–110 (2010). https://doi.org/10.1134/S1811238210010121
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DOI: https://doi.org/10.1134/S1811238210010121