穿膜肽TAT被证实可用于不同类型药物分子的递送,包括核酸、蛋白质和小分子药物等。TAT可以通过共价连接和非共价连接等形式递送分子。但是迄今TAT采用非共价连接形式递送蛋白质分子的报道较少,也未有研究比较过融合形式和非融合形式下TA...穿膜肽TAT被证实可用于不同类型药物分子的递送,包括核酸、蛋白质和小分子药物等。TAT可以通过共价连接和非共价连接等形式递送分子。但是迄今TAT采用非共价连接形式递送蛋白质分子的报道较少,也未有研究比较过融合形式和非融合形式下TAT递送蛋白质能力的差异。为了探究非融合形式对于TAT递送蛋白质能力的影响,本文采用了荧光显微镜观察和流式细胞检测法在细胞水平上探究了TAT以非融合形式递送增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)进入人非小细胞肺癌细胞A549的能力,发现其可以穿膜递送EGFP,并且递送能力与TAT浓度呈现正相关。同时,本文还表达纯化了TAT与绿色荧光蛋白质EGFP的融合蛋白TAT-EGFP并考察了其穿膜能力。本文将两种形式的递送效果进行定量对比后发现:当TAT以融合蛋白形式递送EGFP时,其递送能力要明显优于TAT以非融合形式递送EGFP的能力。本文报道了TAT能够以非融合形式递送EGFP,尽管其递送效果有待进一步提高,但是该递送形式在操作便捷性上有着不可比拟的优势,是未来一种值得选择的递送方案。展开更多
In this paper, we prepared a dual functional system based on dextrin-coated silver nanoparticles which were further attached with iron oxide nanoparticles and cell penetrating peptide(Tat), producing Tat-modified Ag-F...In this paper, we prepared a dual functional system based on dextrin-coated silver nanoparticles which were further attached with iron oxide nanoparticles and cell penetrating peptide(Tat), producing Tat-modified Ag-Fe_3O_4 nanocomposites(Tat-FeAgNPs). To load drugs, an –SH containing linker, 3-mercaptopropanohydrazide, was designed and synthesized. It enabled the silver carriers to load and release doxorubicin(Dox) in a pH-sensitive pattern. The delivery efficiency of this system was assessed in vitro using MCF-7 cells, and in vivo using null BalB/c mice bearing MCF-7 xenograft tumors. Our results demonstrated that both Tat and externally applied magnetic field could promote cellular uptake and consequently the cytotoxicity of doxorubicin-loaded nanoparticles,with the IC_(50) of Tat-FeAgNP-Dox to be 0.63 mmol/L. The in vivo delivery efficiency of Tat-FeAgNP carrying Cy5 to the mouse tumor was analyzed using the in vivo optical imaging tests, in which TatFeAgNP-Cy5 yielded the most efficient accumulation in the tumor(6.772.4% ID of Tat-FeAgNPs).Anti-tumor assessment also demonstrated that Tat-FeAgNP-Dox displayed the most significant tumor-inhibiting effects and reduced the specific growth rate of tumor by 29.6%(P ? 0.009), which could be attributed to its superior performance in tumor drug delivery in comparison with the control nanovehicles.展开更多
文摘穿膜肽TAT被证实可用于不同类型药物分子的递送,包括核酸、蛋白质和小分子药物等。TAT可以通过共价连接和非共价连接等形式递送分子。但是迄今TAT采用非共价连接形式递送蛋白质分子的报道较少,也未有研究比较过融合形式和非融合形式下TAT递送蛋白质能力的差异。为了探究非融合形式对于TAT递送蛋白质能力的影响,本文采用了荧光显微镜观察和流式细胞检测法在细胞水平上探究了TAT以非融合形式递送增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)进入人非小细胞肺癌细胞A549的能力,发现其可以穿膜递送EGFP,并且递送能力与TAT浓度呈现正相关。同时,本文还表达纯化了TAT与绿色荧光蛋白质EGFP的融合蛋白TAT-EGFP并考察了其穿膜能力。本文将两种形式的递送效果进行定量对比后发现:当TAT以融合蛋白形式递送EGFP时,其递送能力要明显优于TAT以非融合形式递送EGFP的能力。本文报道了TAT能够以非融合形式递送EGFP,尽管其递送效果有待进一步提高,但是该递送形式在操作便捷性上有着不可比拟的优势,是未来一种值得选择的递送方案。
基金financial supports from National Key Research and Development Plan of China (2016YFE0119200)the Young Elite Scientists Sponsorship Program by Tianjin (No. TJSQNTJ-2017-14)National Natural Science Foundation of China (NSFC 81361140344, 21376164, 81402885, and 81373357)
文摘In this paper, we prepared a dual functional system based on dextrin-coated silver nanoparticles which were further attached with iron oxide nanoparticles and cell penetrating peptide(Tat), producing Tat-modified Ag-Fe_3O_4 nanocomposites(Tat-FeAgNPs). To load drugs, an –SH containing linker, 3-mercaptopropanohydrazide, was designed and synthesized. It enabled the silver carriers to load and release doxorubicin(Dox) in a pH-sensitive pattern. The delivery efficiency of this system was assessed in vitro using MCF-7 cells, and in vivo using null BalB/c mice bearing MCF-7 xenograft tumors. Our results demonstrated that both Tat and externally applied magnetic field could promote cellular uptake and consequently the cytotoxicity of doxorubicin-loaded nanoparticles,with the IC_(50) of Tat-FeAgNP-Dox to be 0.63 mmol/L. The in vivo delivery efficiency of Tat-FeAgNP carrying Cy5 to the mouse tumor was analyzed using the in vivo optical imaging tests, in which TatFeAgNP-Cy5 yielded the most efficient accumulation in the tumor(6.772.4% ID of Tat-FeAgNPs).Anti-tumor assessment also demonstrated that Tat-FeAgNP-Dox displayed the most significant tumor-inhibiting effects and reduced the specific growth rate of tumor by 29.6%(P ? 0.009), which could be attributed to its superior performance in tumor drug delivery in comparison with the control nanovehicles.
