葉酸靶向癌細(xì)胞納米熒光探針的制備及其性能研究
[Abstract]:Nanoparticles with particle size of 100 ~ 200 nm have good enhancement of permeability and retention of (Enhanced permeation and retention effect, EPR), which is expected to solve the problem of low accuracy and unclear edge of cancer detection. It has become a hot spot in the research of targeted detection, localization and treatment of cancer. The results showed that the dextran with good water solubility and compatibility could be obtained by self-assembly method, and the nanoparticles with diameter of 100 ~ 200 nm could be obtained, but on this basis, folate (Folic acid, FA) was added as the target molecule. There is very little research on how to improve the targeting of particles by combining active and passive targets to achieve cancer detection and localization. In this paper, folic acid was used as the target molecule and the fluorescent labeled dextran particle (Dex-DCA-FI/FA NPs),) was prepared by self-assembly. It can be used as a probe to detect the active and passive targeting of cancer cells and to study its properties. The research includes the following aspects: 1. The hydrophobic deoxycholic acid (Deoxycholic acid, DCA) was used to modify dextran, and the self-assembly method was used to optimize the initial concentration and deionized water droplet acceleration. Deoxycholic acid modified dextran nanoparticles with a peak diameter of 167.5 nm and uniform distribution were prepared. However, the stability of particles is not ideal, and need to be improved. 2. Based on the addition of amino groups to Dex-DCA, a variety of 100~200nm nanoparticles (Dex-DCA-NH2 NPs).) modified by aminodeoxycholic acid (100~200nm) were prepared by self-assembly. Due to the electrostatic repellent effect of amino groups, the stability of Dex-DCA-NH2 NPs in solution was greatly improved, and the particle size of Dex-DCA-NH2 NPs could be stored for more than 15 days and within 4 hours in the cell culture medium, and the particle size was still 100 ~ 200 nm.3.. Based on Dex-DCA-NH2, fluorescein isothiocyanate (Fluorescein isothiocyanate, FITC) was modified as a fluorescent marker and folic acid as a target molecule. Three kinds of folic acid-targeted folic acid modified dextran nanoparticles (Dex-DCA-FI/FA NPs),) with fluorescence and diameter of 100 ~ 200 nm were prepared. The stability of Dex-DCA-FI/FA NPs), nanoparticles in the solution was good, and they could be stored for more than 14 days. The particle size was still about 200 nm in the cell culture medium within 4 h. Dex-DCA-FI200.5/FA 0.5 NPs (superscript represents the feed ratio of FITC to amino groups in the synthesis of Dex-DCA-FI, The subscript indicates the content of Dex-DCA-FITC and Dex-DCA-FA, respectively. It can distinguish the cancer cells of the FR () group which the folic acid receptor (FR) overexpression and the FR (-) group with less FR expression. Dex-DCA-FI 500.75/FA 0.25 NPs can distinguish cancer cells from FR () group and FR (-) group. The cytotoxicity of the two nanoparticles to MCF-7 cells, Hela cells and A549 cells at low concentration was very small and had good blood compatibility. It is expected that further in vivo experiments in animals or improvement of performance by altering markers or targeting molecules.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TB383.1;O657.3
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