基于微流控芯片的膀胱癌循環(huán)腫瘤細(xì)胞的特異性捕獲
[Abstract]:[Objective] To design and manufacture a specific screening chip for bladder cancer circulating tumor cells by means of the novel human bladder cancer specific monoclonal antibody BABl, the biotin-affinity system and the micro-flow control chip technology, and to realize the specific capture of the bladder cancer circulating tumor cells, and to explore the factors that affect the capture of target cells by the wafer.[Method] 1. The design of the filter chip is to filter the chip with the aid of the computer-aided design software. the whole screening chip consists of an upper part and a lower part, and each part has a microstructure, the upper part is a fishbone structure, is used for changing the fluid property, and the lower part is a micro-channel structure and is used for capturing a target cell. The preparation method of the screening chip comprises the following steps of: manufacturing a silicon wafer template, preparing a substrate by using a polydimethylsiloxane (PDMS), trimming, punching, cleaning and processing, and sealing the plasma processing key to form a screening chip. The method for screening the surface of the chip comprises the following steps of: firstly, coating the streptavidin in the micro-channel; secondly, carrying out the biotinylation modification on the bladder cancer monoclonal antibody 1abl; and finally, injecting the biotinylated antibody into the micro-channel, and the streptavidin is combined with the biotinylated antibody, Finally, a streptavidin-biotin-antibody system is formed. The preparation of the sample solution: the bladder cancer cell T24 was taken as the target cell, and the fluorescent dye 5 (6)-Kentucky diacetate (CFDA-SE) was used to mark the target cell according to the instructions before the experiment. To obtain the informed consent of the experimental participants, the peripheral blood of the healthy person was taken, and the peripheral blood of the healthy person was diluted 10 times with normal saline. The labeled bladder cancer cell T24 was added to the diluted 10-fold human peripheral blood and a sample solution of different cell concentrations was prepared according to the experiment. The design group of the chip: in the experiment, in order to study whether the antibody has a capture effect on the target cell, according to the antibody coating condition of the surface of the chip, the chip is made into two chips with the fishbone structure and the ababl antibody; and the chip with the fishbone structure and the ababl antibody is provided. the chip captures the target cell: the sample liquid with the concentration of 60 & mu; l and the target cell concentration of 5,000/ ml is pumped into two groups of chips with the fishbone structure and the ababl antibody respectively at a flow rate of 10 & mu; l/ mmin, Statistical capture rate. 7. In order to study the effect of the flow rate on the capture rate of the chip, 60. m u.l of sample liquid with a concentration of 5,000/ ml was pumped into the chip containing the antibody and the fishbone structure at a flow rate of 10, 15, 20, 25 and 30 & mu; l/ min, respectively. In order to study the effect of cell concentration on the capture rate of the chip, a sample solution with a cell concentration of 500, 5,000 and 50,000/ ml was pumped into a chip channel containing an antibody and a fishbone structure at a rate of 10. m u.l/ min, and the effect of the fishbone structure on the capture target cells of the chip was studied. we designed two different chips, i. e., a chip containing a fishbone structure and a non-fish-bone structure, both of which were coated with a babl antibody, a sample solution of 60. m u.l of cell concentration of 5,000/ ml, the chip with the fishbone structure and the ababl antibody and the chip with the ababl antibody are respectively pumped into the chip with the fishbone structure and the ababl antibody at a flow rate of 10 & mu; l/ min, and then the chip is observed under the microscope and counted under the microscope.[Results] 1. The micro-flow control chip is prepared to specifically screen the circulating tumor cells of the bladder cancer, and the size of the micro-flow control chip is 40mm-5mm and 3mm. the upper layer and the lower layer of the chip are fishbone-like structures, the width of the upper layer is 50 & mu; m, the height is 45 & mu; m, the spacing between the two adjacent fishbone structures is 100-300 & mu; m, the lower layer is a micro-channel, and the micro-channel is high by 50 & mu; m. Under the high-power microscope, the chip containing the antibody and the fishbone structure has obvious capture effect on the bladder cancer cell T4. The average of the target cells (20.8 to 6.3) and the average (1.2-1.1) of the non-antibody-containing chips on target cells was statistically significant (P <0.05). The capture rate of the target cells was maintained at about 89% at different cell concentrations. As the flow rate increases, the capture rate of the target cells is decreased; when the flow rate is in the range of 10 ul/ min, the capture rate of the target cells is the most, whether the screening chip containing the fishbone structure or the filter chip without the fishbone structure. At the same flow rate, the capture rate of the chip containing the antibody and the fishbone structure was significantly higher than that of the chip containing the antibody without the fishbone structure (P0.05).[Conclusion] The design of the micro-flow control chip for the bladder cancer circulating tumor cell is low in cost, simple in operation, and has high specificity for capturing the circulating tumor cells of the bladder cancer.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R737.14
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