Preparation of thermoresponsive core-corona particles for controlled phagocytosis via surface properties and particle shape transformation

Cell-particle interactions, such as phagocytosis, exhibit variability based on particle shape, surface physical properties, and diameter. These interactions can be intentionally modified through in situ change in the physical characteristics of the particulate materials. By manipulating both the surface properties and shape of the particles, it may be feasible to regulate their interactions with cells. Objective of this research is to prepare thermoresponsive core-corona particles those undergo transformation and alteration in surface solubility near physiological temperature and to investigate particle shape- and surface physical property-dependent phagocytosis. The glass transition temperature of the prepared particles was controlled via the composition of the polymer core. Rod-type particles, prepared by uniaxially stretching particle-containing films at above the glass transition temperature of the core-forming materials, demonstrated reduced phagocytosis by macrophages compared to that of spherical particles. Furthermore, the physical properties of the particle surface exerted a significant influence on phagocytosis, with hydrophobic particles being more readily engulfed. Consequently, precise control of phagocytosis can be controlled by manipulating the particle's shape and surface properties. The prepared particles have potential applications as drug delivery system carriers, enabling the regulation of cell interactions via particle shape and surface physical properties induced by temperature changes.