DNA damage produced in HaCaT cells by combined fluoranthene exposure and ultraviolet A irradiation.
Fluoranthene is a polycyclic aromatic hydrocarbon (PAH) and a principal constituent of PAH-contaminated aquatic systems. In the present study, fluorescein diacetate uptake and the Comet assay were used to assess the cytotoxicity and genotoxicity of fluoranthene in HaCaT (human adult low calcium high temperature) cells in the presence or absence of ultraviolet A (UVA) irradiation. Exposure of cells to 0.1, 0.25, 0.75, 2, and 5 microM fluoranthene alone for 30 min or to 6.1 +/- 0.07 J/cm2 UVA alone did not cause cytotoxicity or cellular DNA damage. However, concomitant exposure to both caused a nonlinear dose-response in cytotoxicity to HaCat cells. The same exposure conditions also resulted in a dose-responsive DNA damage in HaCaT cells. Because DNA damage mainly was detected at relatively high levels of cytotoxicity, we cannot rule out the possibility that it occurred as a consequence of cellular toxicity mechanisms.
Department of Biology, Jackson State University, Mississippi 39217, USA.
Baoying
B
Zheng
Huey-Min
HM
Hwang
Hongtao
H
Yu
Stephen
S
Ekunwe
D002460:Cell Line; D020552:Comet Assay; D004249:DNA Damage; D005449:Fluorenes / Q000633:toxicity*; D014466:Ultraviolet Rays
D005449:Fluorenes; C007738:fluoranthene