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• W4321003764 abstract "It has been shown that the use of conformationally pH-switchable lipids can drastically enhance the cytosolic drug delivery of lipid vesicles. Understanding the process by which the pH-switchable lipids disturb the lipid assembly of nanoparticles and trigger the cargo release is crucial to optimize the rational design of pH-switchable lipids. Here, we gather morphological observations (FF-SEM, Cryo-TEM, AFM, confocal microscopy), physicochemical characterization (DLS, ELS), as well as phase behavior studies (DSC, 2H NMR, Langmuir isotherm, and MAS NMR) to propose a mechanism of pH-triggered membrane destabilization. We demonstrate that the switchable lipids are homogeneously incorporated with other co-lipids (DSPC, cholesterol, and DSPE-PEG2000) and promote a liquid-ordered phase insensitive to temperature variation. Upon acidification, the protonation of the switchable lipids triggers a conformational switch altering the self-assembly properties of lipid nanoparticles. These modifications do not lead to a phase separation of the lipid membrane; however, they cause fluctuations and local defects, which result in morphological changes of the lipid vesicles. These changes are proposed to affect the permeability of vesicle membrane, triggering the release of the cargo encapsulated in the lipid vesicles (LVs). Our results confirm that pH-triggered release does not require major morphological changes, but can result from small defects affecting the lipid membrane permeability." @default.
• W4321003764 created "2023-02-17" @default.
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• W4321003764 date "2023-02-16" @default.
• W4321003764 modified "2023-10-18" @default.
• W4321003764 title "Switchable Lipids: From Conformational Switch to Macroscopic Changes in Lipid Vesicles" @default.
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• W4321003764 doi "https://doi.org/10.1021/acs.langmuir.2c03149" @default.
• W4321003764 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36793207" @default.
• W4321003764 hasPublicationYear "2023" @default.
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