Association of zinc ion release and oxidative stress induced by intratracheal instillation of ZnO nanoparticles to rat lung.
Zinc oxide (ZnO) nanoparticles are one of the important industrial nanoparticles. The production of ZnO nanoparticles is increasing every year. On the other hand, it is known that ZnO nanoparticles have strong cytotoxicity. In vitro studies using culture cells revealed that ZnO nanoparticles induce severe oxidative stress. However, the in vivo influence of ZnO nanoparticles is still unclear. In the present study, rat lung was exposed to ZnO nanoparticles by intratracheal instillation, and the influences of ZnO nanoparticles to the lung in the acute phase, particularly oxidative stress, were examined. Additionally, in vitro cellular influences of ZnO nanoparticles were examined using lung carcinoma A549 cells and compared to in vivo examinations. The ZnO nanoparticles used in this study released zinc ion in both dispersions. In the in vivo examinations, ZnO dispersion induced strong oxidative stress in the lung in the acute phase. The oxidative stress induced by the ZnO nanoparticles was stronger than that of a ZnCl(2) solution. Intratracheal instillation of ZnO nanoparticles induced an increase of lipid peroxide, HO-1 and alpha-tocopherol in the lung. The ZnO nanoparticles also induced strong oxidative stress and cell death in culture cells. Intracellular zinc level and reactive oxygen species were increased. These results suggest that ZnO nanoparticles induce oxidative stress in the lung in the acute phase. Intracellular ROS level had a high correlation with intracellular Zn(2+) level. ZnO nanoparticles will stay in the lung and continually release zinc ion, and thus stronger oxidative stress is induced.
Health Research Institute (HRI), National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, Japan. hiroko-fukui@aist.go.jp
Hiroko
H
Fukui
Masanori
M
Horie
Shigehisa
S
Endoh
Haruhisa
H
Kato
Katsuhide
K
Fujita
Keiko
K
Nishio
Lilian Kaede
LK
Komaba
Junko
J
Maru
Arisa
A
Miyauhi
Ayako
A
Nakamura
Shinichi
S
Kinugasa
Yasukazu
Y
Yoshida
Yoshihisa
Y
Hagihara
Hitoshi
H
Iwahashi
D000818:Animals; D001483:Base Sequence; D001992:Bronchoalveolar Lavage Fluid; D017931:DNA Primers; D008168:Lung / Q000378:metabolism*; D008297:Male; D053768:Metal Nanoparticles; D018384:Oxidative Stress; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D014132:Trachea; D015032:Zinc / Q000378:metabolism*; D015034:Zinc Oxide / Q000008:administration & dosage*
D017931:DNA Primers; D017382:Reactive Oxygen Species; D015032:Zinc; D015034:Zinc Oxide