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Lysosome membrane permeability: implications for drug delivery.
1Institute of Pharmacy and Chemistry, University of Sunderland, Sunderland, UK. john.b.lloyd@sunderland.ac.uk
Advanced Drug Delivery Reviews
|March 4, 2000
Summary
Lysosome membranes limit the passage of most foreign substances, with permeability depending on a molecule's hydrophilicity. This impacts drug delivery strategies targeting lysosomes.
Area of Science:
- Cell Biology
- Biochemistry
- Pharmacology
Background:
- Lysosomes contain specific transporters for metabolite efflux.
- These transporters are generally not suitable for xenobiotic (foreign compound) transport.
- Efflux of xenobiotics is likely limited to passive diffusion.
Purpose of the Study:
- To evaluate the permeability of the lysosome membrane to xenobiotics.
- To understand the factors influencing passive diffusion across the lysosome membrane.
- To assess the implications for lysosome-targeted drug delivery strategies.
Main Methods:
- Review of experimental studies on passive diffusion across lysosome membranes.
- Analysis of molecular properties influencing membrane permeation, such as hydrophilicity and hydrogen-bonding capacity.
- Correlation of molecular properties with observed permeation rates.
Main Results:
- Lysosome membrane permeability is inversely related to hydrophilicity.
- Large molecules and highly hydrophilic compounds (e.g., sucrose) exhibit very low permeability.
- Hydrogen-bonding capacity effectively predicts molecular permeation across the lysosome membrane.
- Lysosome membrane characteristics resemble those of other biological membranes regarding passive diffusion.
Conclusions:
- The specificity of lysosome transporters and passive diffusion limitations restrict xenobiotic efflux.
- Drug delivery strategies relying on lysosomal release require drugs that can subsequently exit the lysosome.
- Understanding lysosome membrane permeability is crucial for designing effective lysosome-targeted therapeutics.