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Interaction of a cationic polymer with negatively charged proteoliposomes
N O Kozlova1, I B Bruskovskaya, I B Okuneva
1Polymer Department, School of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Russia.
Biochimica Et Biophysica Acta
|August 22, 2001
Summary
Cationic polymers interact electrostatically with vesicles, increasing drug permeability. This effect is linked to protein clustering within the membrane, relevant for understanding polyelectrolyte interactions with cellular membranes.
Area of Science:
- Biochemistry
- Materials Science
- Membrane Biophysics
Background:
- Proteoliposomes, vesicles incorporating proteins, are crucial for studying membrane interactions.
- Understanding polyelectrolyte interactions with lipid bilayers is essential for drug delivery and biomaterial design.
Purpose of the Study:
- To investigate the electrostatic interaction between a cationic polymer, poly-(N-ethyl-4-vinylpryidinium bromide) (PEVP), and proteoliposomes.
- To determine the effect of PEVP on membrane permeability, particularly for the anti-tumor drug doxorubicin.
Main Methods:
- Preparation of proteoliposomes using egg yolk lecithin and stearoylated alpha-chymotrypsin.
- Characterization of PEVP binding to vesicles containing either stearoylated chymotrypsin or cardiolipin.
- Measurement of vesicle permeability to sodium chloride and doxorubicin.
Main Results:
- PEVP binding to vesicles is electrostatic, with higher affinity for cardiolipin than for stearoylated chymotrypsin.
- PEVP increased doxorubicin transmembrane permeability, an effect amplified by higher negative charge density in the membrane.
- PEVP binding induced clustering of stearoylated chymotrypsin within the membrane, correlating with increased doxorubicin permeation.
Conclusions:
- Polycation binding to proteoliposomes is electrostatic and can alter membrane properties.
- Protein clustering induced by polycation interaction is a key factor in enhanced drug permeation.
- These findings provide insights into polyelectrolyte effects on biological membranes and potential applications in drug delivery.