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Adhesion Of Positively Charged Liposomes To Mucosal Tissues

L. S. Guo, R. Radhakrishnan, C. Redemann
Published 1989 · Chemistry

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AbstractA series of positively charged phospholipid and cholesterol derivatives was synthesized and evaluated as membrane components for liposomes. Small unilamellar liposomes containing up to 40 mole% of the synthetic lipids were prepared by sonication. Selected liposome preparations containing these synthetic lipid materials were found to be noncytotoxic in vitro by using a cell growth inhibition assay, whereas liposomes containing more classic positively charged components (stearylamine and cetyltrimethylammonium bromide) showed considerable cytotoxicity. Using an unanesthetized rabbit eye model, we have found that inclusion of the positively charged lipid derivatives into the liposomes significantly enhanced the ocular retention compared to neutral or negatively charged liposomes, presumably by molecular association with poly anionic corneal and conjunctival surface mucoglycoproteins. the increased retention was dependent on charge density and rigidity of the lipid bilayer. An assay for primary amino ...
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