Single-component pH-sensitive liposomes of reduced solid-to-liquid phase transition temperatures
申请人:Savva Michalakis
公开号:US20050095280A1
公开(公告)日:2005-05-05
The current invention relates to the synthesis of novel cationic lipids and their use as delivery vectors for nucleic acids, peptides and other synthetic drugs, in vitro and in vivo. The cationic lipids described herein form stable lamellar structures (liposomes) at physiological pH but destabilize to micelles at acidic and alkaline pH. These structures are characterized of high elasticity, increased fluidity and high transfection activity relative to the corresponding 1,2-dialkyl cationic derivatives and other phospholipids analogues.
In vitro lipofection with novel series of symmetric 1,3-dialkoylamidopropane-based cationic surfactants containing single primary and tertiary amine polar head groups
A novel series of symmetric double-chained primary and tertiary 1,3-dialkoylamido monovalent cationic lipids were synthesized and evaluated for their transfection activities. In the absence of the helper lipid DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine), only the primary and tertiary dioleoyl derivatives 1,3lmp5 and 1,3lmt5, respectively elicited transfection activity. This is a striking difference