DNA-induced aggregation of zwitterionic oligolamellar liposome

Ching Mao Wu, Hsin Lung Chen*, Willisa Liou, Tsang Lang Lin, U. Ser Jeng

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

11 Scopus citations


Liposome consisting of a single zwitterionic lipid as the potential vector for gene therapy has been reported recently; however, whether polyanionic DNA can bind directly with zwitterionic lipid without the aid of multivalent salt still remains unresolved. In this study, we reveal the aggregation of zwitterionic oligolamellar liposomes composed of 1,2-di(cis-9-octadecenoyl)-sn-glycero-3-phosphocholine induced by DNA without the presence of multivalent salt. Our results demonstrate that only a small fraction (<10%) of DNA can bind electrostatically with a portion of the liposomes. Such a low degree of binding, however, induces significant aggregation of these oligolamellar liposomes, yielding large multilamellar particles in which the number of hydrophilic/hydrophobic layer stacking becomes sufficiently large to yield multiple diffraction peaks in the small-angle X-ray scattering profile. Addition of monovalent salt such as NaCl tends to disrupt the multilamellar structure.

Original languageEnglish
Pages (from-to)2324-2328
Number of pages5
Issue number6
StatePublished - 11 2004


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