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Enzyme-Free Liposome Active Motion via Asymmetrical Lipid Efflux
Jinyan Cui1, Hui Jin1, Wei Zhan1
1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 9, 2022
Summary
Researchers created self-propelling liposomes by inducing lipid phase separation and asymmetrical cholesterol removal. These novel liposome micromotors offer a new platform for advanced drug delivery systems.
Area of Science:
- Biomaterials Science
- Colloid Science
- Nanotechnology
Background:
- Liposomes are biocompatible, water-dispersible colloids used in drug delivery.
- Liposome micromotors offer enhanced functionality over traditional carriers.
- Material features for liposome micromotors are not well-defined compared to inorganic/polymer counterparts.
Purpose of the Study:
- To demonstrate active motion in liposomes using intrinsic material properties.
- To explore lipid phase separation and extraction for creating liposome micromotors.
- To correlate liposome movement with cholesterol extraction kinetics.
Main Methods:
- Utilized ternary lipid systems (DPPC/DOPC/cholesterol) for phase separation.
- Induced asymmetrical cholesterol efflux using cyclodextrins as extracting agents.
- Analyzed liposome movement, cholesterol extraction kinetics, and experimental parameters.
Main Results:
- Achieved stable Janus liposomes with distinct liquid domains via phase separation.
- Demonstrated active motion in liposomes triggered by asymmetrical cholesterol efflux.
- Established a correlation between cholesterol extraction and liposome propulsion.
Conclusions:
- Lipid phase separation and extraction are viable strategies for designing liposome micromotors.
- Lipid-based artificial motors can be hierarchically designed.
- This work opens possibilities for advanced, functional liposome carriers.
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