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Switchable Lipids: Conformational Change for Fast pH-Triggered Cytoplasmic Delivery.

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Switchable lipids enhance drug delivery by improving endosomal escape and cytosolic delivery of cell-impermeable compounds. This novel system shows rapid drug release and stability, offering a promising approach for drug formulation.

Keywords:
conformational changedrug deliveryendosomal escapeliposomespH responsiveness

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Area of Science:

  • Biotechnology
  • Materials Science
  • Drug Delivery

Background:

  • Endosomal entrapment hinders the cytosolic delivery of many cell-impermeable therapeutic compounds.
  • Developing effective strategies for endosomal escape is crucial for enhancing drug efficacy.
  • Lipid-based formulations, such as liposomes, are widely explored for drug delivery but often face challenges with cargo release.

Purpose of the Study:

  • To develop and evaluate switchable lipids for improved endosomal escape and cytosolic delivery.
  • To investigate the mechanism of action of switchable lipids in destabilizing liposomes upon acidification.
  • To assess the efficiency and stability of liposome formulations incorporating switchable lipids for delivering cell-impermeable compounds.

Main Methods:

  • Synthesis and characterization of switchable lipids.
  • Incorporation of switchable lipids into liposome formulations.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to study lipid conformational changes.
  • In vitro release assays using sulforhodamine B (model drug) at different pH values.
  • Cellular uptake and endosomal escape studies in HeLa cells.

Main Results:

  • Switchable lipids undergo conformational reorganization upon acidification, triggering liposome bilayer destabilization and fusion.
  • 88% release of sulforhodamine B was observed within 15 minutes at pH 5.
  • Liposome formulations exhibited high stability at physiological pH (7.4) for several months.
  • Demonstrated fast cytosolic delivery of a model polar drug via endosomal escape in HeLa cells.
  • No observed toxicity in cellular assays.

Conclusions:

  • Switchable lipids represent a novel approach to enhance endosomal escape and cytosolic delivery of cell-impermeable compounds.
  • The pH-triggered conformational change of switchable lipids enables efficient cargo release from liposomes.
  • This technology offers a stable and effective platform for developing advanced drug delivery systems with improved therapeutic outcomes.