title: UV-enhanced cytotoxicity of thiol-capped CdTe quantum dots in human pancreatic carcinoma cells.
abstract: Quantum dots (QDs) have been gaining popularity due to their potential application in cellular imaging and diagnosis, but their cytotoxicity under light illumination has not been fully investigated. In this study, green and red mercaptopropionic acid capped CdTe quantum dots (MPA-CdTe QDs) were employed to investigate their cytotoxicity in human pancreatic carcinoma cells (PANC-1) under UV illumination. MPA-CdTe QDs exhibited excellent photostability under UV illumination and could be easily ingested by cells. The cytotoxicity of MPA-CdTe QDs was significantly enhanced under UV illumination, which was determined by changes in cell morphology as well as by decreases in the metabolic activity and cell counting. Our results indicated that green and red QDs had different cellular distribution and exhibited distinct UV-enhanced cytotoxicity. UV illumination enhanced the generation of reactive oxygen species (ROS) in cells containing QDs, and NAC antioxidant could reduce their damage to cells under UV illumination. Moreover, the influences of different UV illumination conditions on the viability of cells containing QDs were examined and discussed in detail.
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
authors.forename: Shu-quan
authors.initials: SQ
authors.lastname: Chang
authors.forename: Yao-dong
authors.initials: YD
authors.lastname: Dai
authors.forename: Bin
authors.initials: B
authors.lastname: Kang
authors.forename: Wei
authors.initials: W
authors.lastname: Han
authors.forename: Ling
authors.initials: L
authors.lastname: Mao
authors.forename: Da
authors.initials: D
authors.lastname: Chen
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry / Q000633:toxicity*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D005456:Fluorescent Dyes; D006801:Humans; D008163:Luminescent Measurements; D018613:Microscopy, Confocal; D010190:Pancreatic Neoplasms / Q000473:pathology; D010316:Particle Size; D045663:Quantum Dots; D017382:Reactive Oxygen Species / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D013438:Sulfhydryl Compounds / Q000737:chemistry / Q000633:toxicity*; D013691:Tellurium / Q000737:chemistry / Q000633:toxicity*; D014466:Ultraviolet Rays
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D017382:Reactive Oxygen Species; D013438:Sulfhydryl Compounds; D013691:Tellurium; C028337:cadmium telluride