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ZnO Nanorod-induced Apoptosis In Human Alveolar Adenocarcinoma Cells Via P53, Survivin And Bax/bcl-2 Pathways: Role Of Oxidative Stress.

M. Ahamed, M. Akhtar, M. Raja, I. Ahmad, M. K. J. Siddiqui, M. Alsalhi, S. Alrokayan
Published 2011 · Materials Science, Medicine

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UNLABELLED Zinc oxide (ZnO) nanoparticles (NPs) are increasingly recognized for their utility in biological applications, including biosensor and medicine. However, little is known about the toxicity mechanisms of ZnO nanorods in human cells. This study was designed to investigate the possible mechanisms of apoptosis induced by ZnO nanorods in human alveolar adenocarcinoma (A549) cells. ZnO nanorod was found to induce cytotoxicity, reactive oxygen species (ROS) generation, oxidative stress and activities of caspase-3 & caspase-9 in a dose- and time-dependent manner. Western blot results showed that ZnO nanorods induced the expression of heat shock protein 70, a first-tier marker of cell damage and a cell-cycle checkpoint protein p53. Moreover, pro-apoptotic protein bax was upregulated and the antiapoptotic proteins, survivin and bcl-2, were downregulated in ZnO nanorod exposed cells. In conclusion, our data demonstrates that ZnO nanorod induced apoptosis in A549 cells through ROS and oxidative stress via p53, survivin, bax/bcl-2 and caspase pathways. FROM THE CLINICAL EDITOR This study describes the mechanisms of apoptosis induced by ZnO nanorods in human alveolar adenocarcinoma cells.
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