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Nucleus-Targeting Gold Nanoclusters for Simultaneous In Vivo Fluorescence Imaging, Gene Delivery, and NIR-Light Activated Photodynamic Therapy

机译:靶向核的金纳米团簇,可同时进行体内荧光成像,基因传递和近红外光激活光动力疗法

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摘要

The nucleus is one of the most important cellular organelles and molecular anticancer drugs, such as cisplatin and doxorubicin, that target DNA inside the nucleus, are proving to be more effective at killing cancer cells than those targeting at cytoplasm. Nucleus-targeting nanomaterials are very rare. It is a grand challenge to design highly efficient nucleus-targeting multifunctional nanomaterials that are able to perform simultaneous bioimaging and therapy for the destruction of cancer cells. Here, unique nucleus-targeting gold nanoclusters (TAT peptide-Au NCs) are designed to perform simultaneous in vitro and in vivo fluorescence imaging, gene delivery, and near-infrared (NIR) light activated photodynamic therapy for effective cancer cell killing. Confocal laser scanning microscopy observations reveal that TAT peptide-Au NCs are distributed throughout the cytoplasm region with a significant fraction entering into the nucleus. The TAT peptide-Au NCs can also act as DNA nanocargoes to achieve very high gene transfection efficiencies (approximate to 81%) in HeLa cells and in zebrafish. Furthermore, TAT peptide-Au NCs are also able to sensitize formation of singlet oxygen (O-1(2)) without the co-presence of organic photosensitizers for the destruction of cancer cells upon NIR light photoexcitation.
机译:核是最重要的细胞器和分子抗癌药物之一,例如顺铂和阿霉素,靶向细胞核内的DNA,在杀死癌细胞方面比在细胞质上更有效。靶向核的纳米材料非常罕见。设计高效的以核为目标的多功能纳米材料是一项巨大的挑战,该材料能够同时进行生物成像和疗法以破坏癌细胞。在这里,独特的靶向核的金纳米团簇(TAT肽-Au NCs)被设计用于同时进行体外和体内荧光成像,基因传递和近红外(NIR)光激活光动力疗法,以有效杀死癌细胞。共聚焦激光扫描显微镜观察发现,TAT肽-Au NCs分布在整个细胞质区域,其中很大一部分进入细胞核。 TAT肽-Au NCs还可以充当DNA纳米货物,在HeLa细胞和斑马鱼中实现很高的基因转染效率(约81%)。此外,TAT肽-Au NCs还能够敏化单线态氧的形成(O-1(2)),而无需同时使用有机光敏剂来破坏近红外光激发下的癌细胞。

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