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Related Experiment Videos

Shrink-wrap vesicles.

Shelly M Fujikawa1, Irene A Chen, Jack W Szostak

  • 1Howard Hughes Medical Institute, and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 14, 2005
PubMed
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Controlled removal of molecules from fatty acid vesicles causes dramatic shrinkage. This method concentrates encapsulated solutes over 50-fold, enabling preparation of small, concentrated vesicles for potential drug delivery applications.

Area of Science:

  • Biochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Large unilamellar vesicles (LUVs) are crucial in various applications, including drug delivery.
  • Controlling vesicle size and content concentration is essential for optimizing their function.
  • Current methods for vesicle modification often face challenges in maintaining solute integrity.

Purpose of the Study:

  • To develop a simple and controlled method for reducing the size of fatty acid vesicles.
  • To investigate the mechanism of vesicle shrinkage induced by mixed micelles.
  • To assess the retention of encapsulated solutes during the shrinkage process.

Main Methods:

  • Utilizing dynamic light scattering to measure vesicle size changes.
  • Employing fluorescence recovery after photobleaching (FRAP) to monitor membrane dynamics.

Related Experiment Videos

  • Using Förster resonance energy transfer (FRET) to study lipid mixing and membrane integrity.
  • Mixing fatty acid vesicles with mixed micelles of fatty acids and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC).

    • Main Results:

    • Vesicles composed of fatty acids undergo significant shrinkage when mixed with POPC-containing micelles.
    • Fatty acid molecules are efficiently transferred from the vesicle membrane to the mixed micelles.
    • Encapsulated impermeable solutes are retained during shrinkage, achieving concentration factors of at least 50-fold.
    • Vesicle shrinkage is confirmed by multiple biophysical techniques, including DLS, FRAP, and FRET.

    Conclusions:

    • A straightforward method for controlled vesicle shrinkage and solute concentration has been established.
    • This technique allows for the preparation of small vesicles with high internal solute concentrations.
    • The findings suggest potential applications in liposomal drug delivery, enhancing therapeutic efficacy through concentrated payloads.