title: Cancer-cell-phenotype-dependent differential intracellular trafficking of unconjugated quantum dots.
abstract: A diverse array of nanoparticles, including quantum dots (QDs), metals, polymers, liposomes, and dendrimers, are being investigated as therapeutics and imaging agents in cancer diseases. However, the role of the cancer-cell phenotype on the uptake and intracellular fate of nanoparticles in cancer cells remains poorly understood. Reported here is that differences in cancer-cell phenotypes can lead to significant differences in intracellular sorting, trafficking, and localization of nanoparticles. Unconjugated anionic QDs demonstrate dramatically different intracellular profiles in three closely related human-prostate-cancer cells used in the investigation: PC3, PC3-flu, and PC3-PSMA. QDs demonstrate punctated intracellular localization throughout the cytoplasm in PC3 cells. In contrast, the nanoparticles localize mainly at a single juxtanuclear location ("dot-of-dots") inside the perinuclear recycling compartment in PC3-PSMA cells, where they co-localize with transferrin and the prostate-specific membrane antigen. The results indicate that nanoparticle sorting and transport is influenced by changes in cancer-cell phenotype and can have significant implications in the design and engineering of nanoscale drug delivery and imaging systems for advanced tumors.
authors.affiliation: Department of Chemical Engineering, Arizona State University, Tempe, AZ 85287-6006, USA.
authors.forename: Sutapa
authors.initials: S
authors.lastname: Barua
authors.forename: Kaushal
authors.initials: K
authors.lastname: Rege
mesh_terms: D001692:Biological Transport; D045744:Cell Line, Tumor; D002966:Clathrin / Q000378:metabolism; D016503:Drug Delivery Systems; D006801:Humans; D008297:Male; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D010641:Phenotype; D011471:Prostatic Neoplasms / Q000378:metabolism*; D045663:Quantum Dots
chemical_list: D002966:Clathrin