Int. J. Mol. Sci. 2014, 15(5), 7444-7461; doi:10.3390/ijms15057444

Effect of Fiber Length on Carbon Nanotube-Induced Fibrogenesis

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Received: 6 March 2014; in revised form: 11 April 2014 / Accepted: 15 April 2014 / Published: 29 April 2014
(This article belongs to the Special Issue Nanotoxicology and Lung Diseases)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Given their extremely small size and light weight, carbon nanotubes (CNTs) can be readily inhaled by human lungs resulting in increased rates of pulmonary disorders, particularly fibrosis. Although the fibrogenic potential of CNTs is well established, there is a lack of consensus regarding the contribution of physicochemical attributes of CNTs on the underlying fibrotic outcome. We designed an experimentally validated in vitro fibroblast culture model aimed at investigating the effect of fiber length on single-walled CNT (SWCNT)-induced pulmonary fibrosis. The fibrogenic response to short and long SWCNTs was assessed via oxidative stress generation, collagen expression and transforming growth factor-beta (TGF-β) production as potential fibrosis biomarkers. Long SWCNTs were significantly more potent than short SWCNTs in terms of reactive oxygen species (ROS) response, collagen production and TGF-β release. Furthermore, our finding on the length-dependent in vitro fibrogenic response was validated by the in vivo lung fibrosis outcome, thus supporting the predictive value of the in vitro model. Our results also demonstrated the key role of ROS in SWCNT-induced collagen expression and TGF-β activation, indicating the potential mechanisms of length-dependent SWCNT-induced fibrosis. Together, our study provides new evidence for the role of fiber length in SWCNT-induced lung fibrosis and offers a rapid cell-based assay for fibrogenicity testing of nanomaterials with the ability to predict pulmonary fibrogenic response in vivo.
Keywords: carbon nanotubes; fiber length; lung fibrosis; ROS; type I collagen; TGF-β
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MDPI and ACS Style

Manke, A.; Luanpitpong, S.; Dong, C.; Wang, L.; He, X.; Battelli, L.; Derk, R.; Stueckle, T.A.; Porter, D.W.; Sager, T.; Gou, H.; Dinu, C.Z.; Wu, N.; Mercer, R.R.; Rojanasakul, Y. Effect of Fiber Length on Carbon Nanotube-Induced Fibrogenesis. Int. J. Mol. Sci. 2014, 15, 7444-7461.

AMA Style

Manke A, Luanpitpong S, Dong C, Wang L, He X, Battelli L, Derk R, Stueckle TA, Porter DW, Sager T, Gou H, Dinu CZ, Wu N, Mercer RR, Rojanasakul Y. Effect of Fiber Length on Carbon Nanotube-Induced Fibrogenesis. International Journal of Molecular Sciences. 2014; 15(5):7444-7461.

Chicago/Turabian Style

Manke, Amruta; Luanpitpong, Sudjit; Dong, Chenbo; Wang, Liying; He, Xiaoqing; Battelli, Lori; Derk, Raymond; Stueckle, Todd A.; Porter, Dale W.; Sager, Tina; Gou, Honglei; Dinu, Cerasela Z.; Wu, Nianqiang; Mercer, Robert R.; Rojanasakul, Yon. 2014. "Effect of Fiber Length on Carbon Nanotube-Induced Fibrogenesis." Int. J. Mol. Sci. 15, no. 5: 7444-7461.

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