Integrating Experiments and Simulations to Uncover Size-Dependent Bioactivity in Cellular Nanodiscs.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Membrane Biophysics

Background:

• Cellular nanodiscs (CNDs) merge biological membrane properties with synthetic nanomaterial tunability.
• CNDs offer potential for therapeutic and diagnostic uses.
• The impact of CND size on biological function remains unclear.

Purpose of the Study:

• To investigate the relationship between CND size and biological performance.
• To elucidate how CND size influences bioactivity.
• To establish design principles for optimizing CND formulations.

Main Methods:

• Generated red blood cell (RBC)-derived CNDs using styrene-maleic anhydride copolymers.
• Produced CNDs with distinct sizes (approx. 71, 26, and 15 nm).
• Employed functional assays, Brownian dynamics simulations, and in vivo mouse models.

Main Results:

• Smaller CNDs demonstrated significantly enhanced antibody binding and faster interaction kinetics.
• Reduced CND size correlated with increased diffusion coefficients and particle numbers.
• The smallest CNDs exhibited potent α-toxin neutralization and improved survival in mice.

Conclusions:

• CND size is a critical determinant of bioactivity.
• Precise size control is essential for optimizing CND performance in biological applications.
• Findings provide design principles for developing effective CND-based therapeutics and diagnostics.