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Wavelength-programmed solute release from photosensitive liposomes.

R H Bisby1, C Mead, C G Morgan

  • 1Division of Biological Sciences, School of Environmental and Life Sciences, University of Salford, Salford M5 4WT, United Kingdom. r.h.bisby@salford.ac.uk

Biochemical and Biophysical Research Communications
|September 28, 2000
PubMed
Summary

Cholesterol addition to photoresponsive liposomes enables visible light-triggered drug release. This allows for wavelength-dependent and stepped partial release, enhancing potential for controlled drug delivery applications.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Drug Delivery

Background:

  • Liposomes are lipid vesicles used for drug delivery.
  • Photoresponsive liposomes can release contents upon light exposure.
  • Bis-Azo PC is a photochromic lipid enabling UV-triggered release.

Purpose of the Study:

  • To investigate the effect of cholesterol on liposome photoresponsiveness.
  • To explore wavelength-dependent and controlled solute release from liposomes.

Main Methods:

  • Liposomes composed of dipalmitoylphosphatidylcholine and Bis-Azo PC were prepared.
  • Cholesterol was incorporated into liposomal membranes at varying concentrations (up to 25 mol%).
  • Solute release was triggered by UV light and visible light (470 nm).

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Main Results:

  • Cholesterol incorporation enabled visible light (470 nm)-triggered solute release.
  • Liposomes with and without cholesterol showed wavelength-dependent release in mixed populations.
  • Cholesterol-containing liposomes allowed for stepped, partial solute release upon multiple visible light exposures.

Conclusions:

  • Cholesterol modifies liposome membranes to respond to visible light.
  • Wavelength-tunable and controlled release mechanisms were achieved.
  • Cholesterol-modified liposomes show promise for advanced drug delivery and reagent caging.