Reagent kit for detecting colorectal cancer on basis of liquid biopsy

A technology for colorectal cancer and liquid biopsy, which is applied to measurement devices, instruments, scientific instruments, etc., can solve the problems of different antigens, missed detection, weak fluorescence intensity, etc., and achieves the effect of high enrichment efficiency

Active Publication Date: 2017-06-13
SHANGHAI YH HEALTH BIOLOGY MEDICINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only specifically identify the rare cells through a single monoclonal antibody, which is likely to cause missed detection
At the same time, due to the heterogeneity of cells, the amount of antigen expressed by each cell is different, resulting in sometimes very weak fluorescence intensity, which is difficult to distinguish under a fluorescence microscope

Method used

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  • Reagent kit for detecting colorectal cancer on basis of liquid biopsy
  • Reagent kit for detecting colorectal cancer on basis of liquid biopsy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1 enrichment of target cells in peripheral blood

[0057] (1) Centrifuge peripheral blood to remove plasma protein: 8.5mL peripheral blood was centrifuged at 800g in a horizontal centrifuge for 7min at room temperature, and the supernatant was discarded.

[0058] (2) Add 5-6 mL of PBS buffer solution and 3 mL of lymphocyte separation solution to the plasma in step (1), centrifuge at 450 g in a centrifuge for 7 minutes at room temperature. After centrifugation, it is divided into three layers. The red bottom layer is the erythrocyte layer, the slightly white middle layer is mainly white blood cells and CTC, etc., and the yellow upper layer is plasma. Absorb all the liquid above the erythrocyte layer and remove the bottom erythrocyte layer.

[0059] (3) Add 200 mL of immunomagnetic beads with CD45 antibody coupled to the surface dropwise in step (2), and incubate on a horizontal shaker to obtain a suspension. At room temperature, shake horizontally for 20 minutes...

Embodiment 2

[0061] Example 2 Fluorescent staining of enriched target cells

[0062] (1) Enhanced staining pretreatment: Add 2 μL of staining enhancement solution to about 50 μL of enriched target cells, and let stand at room temperature for 10 min. The staining enhancing solution is a PBS buffer solution of SDS or Triton X-100, and the SDS concentration is 0.1 mg / mL.

[0063] (2) Cell surface staining: After diluting CD45-Alexa 5941 μL with 199 μL of PBS buffer, it was added to the cell suspension after the pretreatment in step (1), and then incubated in the dark for 20 minutes. After incubation, add PBS buffer to wash the cell liquid, centrifuge at 950g for 4min, and remove the supernatant to 100μL.

[0064] (3) Cell fixation: transfer and smear the cells in step (2) onto a glass slide, then add the fixative paraformaldehyde, fix for 10 min, and wash the slide twice with PBS, 5 min each time.

[0065] (4) Cell membrane rupture: After the cells were fixed, 200 μL of cell membrane ruptur...

Embodiment 3

[0069] Example 3 Fluorescent staining detection of DLD-1 human colorectal cancer cell line

[0070] DLD-1 human colorectal cancer cells (purchased from the Cell Bank of the Chinese Academy of Sciences) were enzymatically digested and 10 5 Cells, approximately 50 μL, were subjected to fluorescent staining and fluorescent microscope examination of the cells according to the steps in Example 2. Microscopic examination conditions are as follows: when the excitation light wavelength is 591nm, Alexa594 emits 618nm red light, and the exposure time is 100ms; when the excitation light wavelength is 650nm, CY5 emits 670nm far-red light (invisible to the naked eye, and the microscope scanning is assigned purple). The time is 100ms; when the excitation light wavelength is 499nm, Alexa488 emits 519nm green light, and the exposure time is 100ms; when the excitation light wavelength is 345nm, DAPI emits 455nm blue light, and the exposure time is 10-20ms, the results are as follows figure 1 ...

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Abstract

The invention provides a reagent kit for detecting colorectal cancer on the basis of liquid biopsy. The reagent kit comprises staining enhancement solution for enhancing staining effects and specific antibodies with fluorescence staining markers. The specific antibodies include CK20 antibodies, CD45 antibodies and CDX2 antibodies; the staining enhancement solution comprises surfactants with the concentration of 0.001-1 mg / mL. The reagent kit has the advantages that target cells can be effectively enriched, and whether the enriched target cells come from early-stage patients who suffer from the colorectal cancer or not can be confirmed; the tumor detection sensitivity can be improved by means of double-tumor-marker detection, and the detection accuracy further can be guaranteed by means of CEP8 detection; the staining effects can be enhanced by the staining enhancement solution, accordingly, the diversified antibodies with the fluorescence staining markers can be combined with the target cells, the target cells can be stained, the good staining effects can be realized, fluorescence is intensive, and boundaries are clear.

Description

technical field [0001] The invention relates to the field of liquid biopsy, in particular to a kit for detecting colorectal cancer based on liquid biopsy. Background technique [0002] Colorectal cancer (CRC) is a common cancer with the third highest morbidity and mortality among all cancers worldwide, with an average of 1.2 million people diagnosed with CRC each year. According to statistics, the morbidity and mortality of CRC in my country are higher than the world average. In 2011, an average of 23 patients per 100,000 people were diagnosed with CRC, and about 11 people per 100,000 people died of CRC. Moreover, in recent years, the incidence and mortality of CRC in my country have been increasing continuously. Therefore, it is particularly important for the early screening of CRC and the detection during the development of the disease. In this regard, methods based on circulating tumor cell (CTC) detection have many advantages that traditional detection methods do not h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/574
CPCG01N33/57419
Inventor 段彪陈昌岳张培培张祥林冯丽娜蔡红东
Owner SHANGHAI YH HEALTH BIOLOGY MEDICINE TECH CO LTD
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