277444 Studies of Protein Expression Upon Cellular Exposure to Nanomaterials

Monday, October 29, 2012: 2:30 PM
326 (Convention Center )
Gabrielle Rogers-Nieman, Department of Chemical Engineering, West Virginia University, Morgantown, WV

Studies of protein expression upon cellular exposure to nanomaterials


Gabrielle Rogers-Nieman1, David Lowry 2,

 Michael L. Kashon2, Linda M. Sargent2, and Cerasela Zoica Dinu1*

1Department of Chemical Engineering, West Virginia University, Morgantown WV,

26506, USA

2National Institute for Occupational Safety and Health, Morgantown WV, 26505, USA

* Corresponding author

Carbon nanotubes (CNTs) have many potential applications in industry because of their extraordinary mechanical, electrical and structural properties. However, recent studies demonstrate that CNTs can enter the working environment as suspended particulate matter of respirable sizes, which could pose an occupational inhalation exposure hazard and thus create challenges for exposure control. Research has also shown that CNTs associate with cellular elements, namely cytoskeletal filament microtubule and the DNA and interfere with cell progression to normal division, most notably by disruption of the centrosome. This leads to aneuploidy, an early event in the progression of lung mesothelioma. Such results further suggest that CNT cellular uptake and the mechanisms of nanotube cellular transport may play a role in both tumorigenesis and tumor progression. In our research we are unraveling the mechanisms associated with the nanotube uptake and their cellular transport in order to understand if the nanotube cellular interactions affect key protein expression involved in mitotic spindle formation. Using real time PCR complemented by optical microscopy and fluorescence activated cell sorting, our preliminary results show that CNTs affect the cell cycle and this is correlated with fluctuations in the expression level of integral motor proteins responsible for nanotube transport inside the cell. These observations are time and dose dependent. The quantification of expressional differences in messenger RNA of integral molecular motors during a time course of CNT exposure can provide a more detailed explanation of genotoxicity associated with cellular exposure to CNTs.


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