Variables influencing interactions of untargeted quantum dot nanoparticles with skin cells and identification of biochemical modulators.

Skin cells (NHEK) take up untargeted quantum dots (QD) with surface polyethylene glycol (PEG), amines, and carboxylic acids, but the mechanisms are unknown. Time courses of QD-NHEK interactions were determined and effects of QD surface coating, temperature, culture medium supplements and inhibitors of the cell cycle and endocytosis identified. The magnitude of QD-NHEK interactions was coating dependent. Low-temperature or unsupplemented medium decreased QD-NHEK interactions. Biochemical inhibitors were identified that attenuate and potentiate QD-NHEK interactions. These results are important for understanding and controlling interactions of untargeted QD with cells.