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[Inclusion of erythrocyte membranes into planar lipid bilayers]
Abstract:
Planar lipid bilayer membranes (PM) were modified by membrane vesicles prepared from rabbit erythrocytes. Vesicles contained amphotericin B and tetraethylammonium. Voltage-current relationships of modified PM were investigated. Semi-fusion, the inclusion of sealed vesicles into PM with formation of contact bilayer consisting of one lipid monolayer of the erythrocyte membrane and another monolayer of PM, was shown to appear some minutes after the contact of vesicles with PM. Some tens of minutes later fusion of the erythrocyte membranes with PM was observed. Fusion occurred either by opening out of vesicles or by incorporation of sealed vesicles into PM. The temperature rise increased the fusion probability. Sealed vesicles were incorporated in PM asymmetrically: the contact area was always smaller than the noncontact vesicle surface.
Insights
Rabbit erythrocyte vesicles modified planar lipid bilayer membranes (PM). Researchers observed semi-fusion and fusion events, with temperature increasing fusion probability. Vesicles incorporated asymmetrically into PM.
Area of Science:
- Membrane biophysics
- Lipid bilayer dynamics
- Biomembrane interactions
Context:
- Planar lipid bilayer membranes (PM) are crucial models for studying cellular membranes.
- Erythrocyte membrane vesicles offer a biologically relevant system for membrane modification.
- Amphotericin B and tetraethylammonium are components influencing membrane properties.
Purpose:
- To investigate the modification of planar lipid bilayer membranes (PM) using vesicles from rabbit erythrocytes.
- To characterize the voltage-current relationships of these modified membranes.
- To elucidate the mechanisms and kinetics of vesicle-PM interactions, including semi-fusion and fusion.
Summary:
- Planar lipid bilayer membranes (PM) were modified with vesicles derived from rabbit erythrocytes containing amphotericin B and tetraethylammonium.
- Semi-fusion, forming a contact bilayer, occurred minutes after vesicle-PM contact, followed by full fusion tens of minutes later.
- Fusion proceeded via vesicle opening or incorporation, with increased temperature enhancing fusion probability. Vesicle incorporation into PM was asymmetric.
Impact:
- Provides insights into the mechanisms of membrane fusion and modification.
- Contributes to understanding the behavior of biomimetic membrane systems.
- Informs the development of novel drug delivery systems or biosensors utilizing membrane fusion principles.