Surface-Attached Model Lipid Membranes Derived from Human Red Blood Cells

Area of Science:

• Biophysics
• Biochemistry
• Materials Science

Background:

• Red blood cells (RBCs) are crucial for health, with membrane interactions influencing immunity, pathogen binding, and drug efficacy.
• Studying RBC membrane interactions requires advanced model systems for surface-sensitive measurements.
• Existing models may not fully capture the complexity of RBC membrane interfaces.

Purpose of the Study:

• To develop and characterize novel surface-attached model lipid membranes derived from red blood cells.
• To enable detailed biophysical and biochemical investigations of RBC membrane interactions.
• To provide versatile platforms for studying health-related cellular processes.

Main Methods:

• Preparation of liposomes from RBC ghosts via extrusion.
• Assembly of tethered RBC liposomes using biotinylated lipids and avidin-coated surfaces.
• Formation of hybrid RBC-rupture vesicle supported lipid bilayers (RBC-SLBs) using vesicle fusion and PEG lipids.

Main Results:

• Successful preparation of tethered RBC liposomes and RBC-SLBs.
• Characterization confirmed lipid mobility in RBC-SLBs at low RBC fractions, decreasing at higher fractions.
• Demonstrated functionality via acetylcholinesterase activity and viral pathogen binding in RBC-SLBs.

Conclusions:

• Developed robust methods for creating RBC-derived model membranes.
• These models offer valuable tools for studying RBC membrane interactions and engineering other physiological membrane platforms.
• The findings facilitate research in immunology, infectious diseases, and drug development.