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  • 學位論文

製備海藻膠/半胱胺酸修飾之金奈米棒於口腔癌細胞之光熱治療

Synthesis of alginate-cysteine modified gold nanorods for photothermal therapy of oral cancer

指導教授 : 吳嘉文

摘要


本研究的目的是製備出具有良好生物相容性與標靶性的金奈米棒(Gold nanorod)並透過近紅外光源的照射下進行光熱治療來殺死癌細胞。藉由使用EDC活化海藻膠上的羧酸基,並與半胱胺酸(Cysteine)和標靶分子c(RGDfk)上的一級胺生成胜肽鏈,合成具有半胱胺酸與標靶分子的海藻膠高分子來修飾金奈米棒。其中半胱酸上的硫醇基能與金奈米棒形成穩定的硫金鍵結並取代表面的CTAB,海藻膠上的羧酸基與羥基能提供能提供材料高負電性與親水性,防止材料產生聚集,而修飾的c(RGDfk)KKK可用於標靶人類口腔鱗狀上皮細胞SAS。 我們藉由穿透式電子顯微鏡、界面電位分析、紫外光可見光光譜儀與FTIR等結果證實我們成功地製備出海藻膠/半胱胺酸修飾的金奈米棒。利用ICP-MS量測經由修飾標靶分子的材料於SAS細胞中Au的累積量,其結果提升了2倍,將材料使用近紅外光光源照射來進行光熱治療的實驗,GNR@Alg-Cys與GNR@Alg-Cys-RGD的細胞相對存活率為0.5與0.1,證實接上標靶分子的材料因為更容易進入細胞而有更好的治療效果,並且能夠藉由調整照光區域對特定位置進行加熱,在不影響周邊細胞的的情形下進行光熱治療來殺死癌細胞。

並列摘要


Gold nanorods/alginate/cysteine (denoted as GNR@Alg-Cys) nanocomposites with good biocompatibility and cell-targeting ability are synthesized for photothermal therapy (PTT). Owing to the carboxylic acid groups on the alginate, we successfully functionalize alginate polymer with the primary amine groups of the cysteine and with targeting molecules (c(RGDfk)) through the formation of peptide bonds. Then, the thiol groups of the cysteine-functionalized alginate polymer can replace the surface protecting molecules (i.e. Cetyltrimethyl Ammonium Bromide; CTAB) on gold nanorods that were previously synthesized, thus connect the Au NRs with alginate polymer through Au-S bonds. In addition, we utilize c(RGDfK) oligopeptide to target the squamous cell carcinoma (i.e. SAS). The successful synthesis of GNR@Alg-Cys nanocomposites is confirmed with TEM, zeta potential, UV-Vis and FTIR analysis. The enhanced endocytosis of RGD-functionalized GNR@Alg-Cys is 1.95 times more than that of GNR@Alg-Cys, according to ICP-MS measurement. For PTT application, the synthesized samples are illuminated by NIR after SAS cell uptake, and the relative cell viabilities of GNR@Alg-Cys and GNR@Alg-Cys-RGD are 0.5 and 0.1, respectively. This result indicates that our GNR@Alg-Cys-RGD sample show great potential in PDT in the future nanomedicine.

參考文獻


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