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標題: 探討奈米二氧化鈦對哺乳動物細胞的細胞生長與分裂之影響
The Effect of TiO2 Nanoparticles on Mammalian Cell Proliferation and Cytokinesis
作者: 黃馨
Huang, Shing
關鍵字: TiO2 Nanoparticles;奈米二氧化鈦;Proliferation;Cytokinesis;細胞增生;細胞分裂
出版社: 生物醫學研究所
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我們進一步探討奈米二氧化鈦的長期暴露對細胞的影響,首先以濃度10 μg/mL的奈米二氧化鈦處理老鼠纖維母細胞數週,發現細胞的大小及型態有明顯的改變;並有微核、雙核、多核的細胞產生;在軟瓊脂群落鑑定技術中,也發現隨著暴露時間的增長,細胞在軟瓊脂膠中形成的群落數也越多,表示細胞轉型能力增強。另一方面,我們也發現長期暴露在奈米二氧化鈦的細胞,細胞有分裂異常及染色體排列錯誤等現象。因此我們推測,長期暴露在奈米二氧化鈦下會導致基因不穩定、細胞分裂異常,而使細胞有微核、雙核、多核產生的現象,進而導致細胞的轉型,這或許就是奈米二氧化鈦所引發細胞癌化的原因。

Titanium dioxide nanoparticles (nano-TiO2) are widely used as cleaning, cosmetic, white paint and medical science materials because of its low toxicity. Recent research has shown that nano-sized TiO2 particles possess cytotoxicity and genotoxicity through inhibition in cell viability, induction of apoptosis, as well as formation of MN (micronuclei) and NPB (nucleoplasmic bridge). On the other hand, an increase in cell proliferation is showen to be associated with tumorgenesis in mice exposed to nano-TiO2. In this study, we confirmed that nano-sized TiO2 increased NIH 3T3 cell viability determined by MTT assay and cell proliferation by trypan blue as well as colony forming assays. Further experiments demonstrated that nano-TiO2 stimulated ROS generation and ERK activation.The long-term effect of nano-TiO2 was investigated by selecting NIH 3T3 cells grown in 10μg/mL nano-TiO2 for weeks. We found altered morphology and size in nano-TiO2-exposed cells compared to wild type. In addition, cell transformation as well as numbers of MN, binucleate, and multinucleate were significantly increased by nano-TiO2 exposure. Morever, long-term exposure of nano-TiO2 affected cell division and resulted in chromosome misalignment, missegregation and cytokinesis failure. Taken together, our results suggested that nano-TiO2 enhanced cell proliferation and genomic instability leading to cell transformation.
其他識別: U0005-2706200819210300
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