Abstract
The stability of small unilamellar vesicles formed by egg phosphatidylcholine has been examined in the presence of 38 tricyclic carboxamide DNA-intercalating agents (19 phenylquinolines, 17 phenylbenzimidazoles, an acridine and an anthracene). Lysis of the vesicular membrane is time-dependent and also dependent on the concentration of the cytotoxic agent. The relative concentration of agent to cause a fixed degree of lysis in a fixed time, as measured by the release of encapsulated 6-carboxyfluorescein, is directly related to the relative hydrophobicity of the agents.
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