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[Reaction between liposomes and biomolecular membranes]
Biofizika
|May 1, 1979
Summary
Liposomes containing cholesterol fused with cholesterol-free lipid membranes, altering ion selectivity and membrane conductance. This interaction, facilitated by nystatin, induced significant changes in bilayer resistance.
Area of Science:
- Biophysics
- Membrane Biophysics
- Lipid Bilayer Systems
Background:
- Bimolecular lipid membranes (BLM) are crucial models for cell membranes.
- Liposomes are widely used for drug delivery and membrane studies.
- Cholesterol's role in lipid membrane properties is well-established.
Purpose of the Study:
- To investigate the interaction between liposomes and BLM.
- To understand how cholesterol in liposomes affects BLM properties.
- To explore the impact of polyene antibiotic nystatin on these interactions.
Main Methods:
- Formation of bimolecular lipid membranes (BLM).
- Incorporation of liposomes containing cholesterol into BLM.
- Treatment with polyene antibiotic nystatin.
- Measurement of BLM resistance and conductance.
Main Results:
- Small liposomes did not alter BLM resistance in monovalent ion solutions.
- Cholesterol-containing liposomes interacting with cholesterol-free BLM in nystatin induced anion selectivity and increased conductance (4-5 orders).
- Addition of cholesterol-containing liposomes and nystatin caused a stepwise decrease in BLM resistance (2-3 orders), with both cation- and anion-selective steps observed.
Conclusions:
- The observed changes in BLM properties suggest fusion and incorporation of liposomes into the membrane.
- Cholesterol plays a key role in mediating liposome-BLM interactions.
- Nystatin facilitates significant alterations in membrane ion selectivity and conductance through liposome incorporation.