Single-Particle Analysis Reveals Heterogeneity in Membrane Coating

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Materials Science

Background:

• Cell membrane coating of nanoparticles creates biomimetic nanocarriers with enhanced properties like immune evasion and circulation.
• Challenges exist in achieving uniform, scalable membrane coating and quantifying coating degree at the single-particle level.

Purpose of the Study:

• To establish a quantitative platform, Single-Particle Analysis of CEll MembrANe (SPACEMAN), for evaluating nanoparticle membrane coating integrity and heterogeneity.
• To compare different coating methods and identify an optimal strategy for biomimetic nanocarrier development.

Main Methods:

• Development and application of the SPACEMAN platform for single-nanoparticle analysis.
• Comparative assessment of nano-vesiculation via ultrasonication, extrusion, and sonication for cell membrane coating.
• Evaluation of nanoparticle immune evasion and circulation in vitro and in vivo.

Main Results:

• SPACEMAN provides accurate, single-nanoparticle resolution of coating integrity and heterogeneity.
• Nano-vesiculation via ultrasonication achieved a higher overall coating rate (82.2%) compared to extrusion (68.0%) and sonication (61.0%).
• Ultrasonication resulted in a greater proportion of nanoparticles with high surface coverage and demonstrated superior immune evasion and prolonged circulation.

Conclusions:

• SPACEMAN is a generalizable analytical framework for quantifying nanoparticle coating heterogeneity.
• Optimized nano-vesiculation via ultrasonication enhances biomimetic nanocarrier performance.
• This platform facilitates the development of advanced nanocarriers with improved drug delivery capabilities.