Magnetic micromotors crossing lipid membranes

Area of Science:

• Nanotechnology and Materials Science
• Biomedical Engineering
• Physical Chemistry

Background:

• Nanomotors are self-propelled particles with potential in nanomedicine for imaging and drug delivery.
• Efficient locomotion of nanomotors, especially across biological barriers, requires further understanding.
• Current research lacks detailed insights into factors governing nanomotor interaction with cell membranes.

Purpose of the Study:

• To investigate the influence of nanomotor size and surface chemistry on their ability to cross lipid membranes.
• To explore the impact of lipid membrane composition and external magnetic fields on nanomotor locomotion.
• To provide a comprehensive analysis of nanomotor-membrane interactions for improved nanomotor design.

Main Methods:

• Assembly of magnetically propelled nanomotors (0.5, 1, and 4 μm) with varying surface chemistries (positive charge, PEGylated).
• Assessment of nanomotor motion in the presence of giant unilamellar lipid vesicles (GUVs) with diverse lipid compositions.
• Utilized data-driven statistical analysis for individual nanomotor motion tracking and ensemble analysis.

Main Results:

• Nanomotor size was not the primary factor determining membrane crossing ability.
• 0.5 μm PEGylated nanomotors showed limited membrane crossing compared to positively charged counterparts.
• Saturated lipid membranes, especially with weak magnetic fields, facilitated nanomotor crossing irrespective of size.

Conclusions:

• Nanomotor locomotion across biological barriers is influenced more by surface interactions and environmental conditions than by size alone.
• Surface chemistry (e.g., charge) and membrane lipid composition significantly impact nanomotor interaction and penetration.
• Findings offer critical insights for designing advanced nanomotors for targeted nanomedicine applications.