WO2021213304A1 - 一种检测小细胞肺癌患者外周血循环肿瘤细胞nse基因突变的试剂盒及检测方法 - Google Patents
一种检测小细胞肺癌患者外周血循环肿瘤细胞nse基因突变的试剂盒及检测方法 Download PDFInfo
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N5/06—Animal cells or tissues; Human cells or tissues
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/57407—Specifically defined cancers
- G01N33/57423—Specifically defined cancers of lung
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Definitions
- the invention provides a kit and a detection method for detecting NSE gene mutations in peripheral blood circulating tumor cells of patients with small cell lung cancer, and belongs to the technical field of molecular biology.
- Lung cancer is one of the main malignant tumors leading to the death of cancer patients. In China, the incidence and mortality of lung cancer rank first. Small cell lung cancer (SCLC) accounts for about 15% to 20% of the incidence of lung cancer. Compared with non-small cell lung cancer, it has the characteristics of faster tumor doubling time, rapid growth and easy early metastasis.
- SCLC Small cell lung cancer
- Circulating tumor cells are tumor cells that fall off from solid tumors and enter the peripheral blood circulation. Since they were discovered in 1989, there have been a variety of methods for detecting circulating tumor cells in the peripheral blood. Recent studies have shown that its detection has important clinical significance for evaluating the prognosis of cancer patients, especially advanced cancer patients, and selecting appropriate individualized treatments. Because CTC detection has the characteristics of minimally invasive and real-time detection, it is called "liquid biopsy" of tumors.
- NSE is one of the enolases involved in the glycolysis pathway and exists in nerve tissues and neuroendocrine tissues. In tumors related to the origin of neuroendocrine tissues, especially SCLC, there is excessive NSE expression, which leads to a significant increase in serum NSE. It is an important tumor marker for SCLC. At present, NSE detection uses serum to detect the concentration of NSE, but there is no record of detecting NSE gene mutations in CTC cells.
- Shandong First Medical University, Shandong Pharmaceutical Research Institute and Shandong Qixin Biotechnology Co., Ltd., Shandong Yuxiao Biotechnology Co., Ltd., Jinan Xingen Biotechnology Co., Ltd., Shandong Discovery Biotechnology Co., Ltd. and other units have Research on the industrialization of key technologies for tumor cell detection and identification.
- This project is a major scientific and technological innovation project in Shandong Province. This project will take the Shandong Provincial Pharmaceutical Research Institute on the Jinan Campus of Shandong First Medical University as the core and implement the registrant system.
- the identification and diagnosis kits are industrialized and promoted through cooperation with Shandong Qixin Biotechnology Co., Ltd., Shandong Yuxiao Biotechnology Co., Ltd., Jinan Xingen Biotechnology Co., Ltd., and Shandong Discovery Biotechnology Co., Ltd., which are registered in Jinan.
- the present invention provides a detection method for non-diagnostic purposes of NSE gene mutations in circulating tumor cells in peripheral blood of patients with small cell lung cancer: a membrane filter device is used to separate and obtain CTCs in peripheral blood of patients with advanced or recurrent small cell lung cancer whose tissue samples cannot be obtained, and further use Immunohistochemical technique was used to detect the expression of NSE of CTC.
- the present invention provides a kit for detecting NSE gene mutations in peripheral blood circulating tumor cells of patients with small cell lung cancer.
- the diluent is composed of 1 mmol/L EDTA + 0.1% BSA + 0.1% trehalose + 0.2% polyoxyethylene polyoxypropylene ether block copolymer, and the base liquid is a Tris-HCl buffer.
- the decolorizing liquid is composed of 95% alcohol and 100% xylene in a volume ratio of 1:1.
- the staining solution A is a DAB staining solution
- the staining solution B is a hematoxylin staining solution.
- the reagent A is a hydroxypropyl methylcellulose xylene mixed liquid with a mass fraction of 0.6%; the reagent B is composed of ethanol and 1,2-propanediol in a volume ratio of 3:1.
- the present invention also provides a method for detecting NSE gene mutations in circulating tumor cells in the peripheral blood of patients with small cell lung cancer for non-diagnostic purposes using the above kit, which includes the following steps:
- the membrane filtration device for separating tumor cells used in the present invention includes a filter, a blood sample container, a waste liquid cylinder, and an iron stand.
- the iron stand is provided with a base, a stand and a bracket.
- the blood sample container is set on the upper part of the iron stand through the bracket.
- a filter which is connected to the waste liquid tank through the infusion set, and the waste liquid tank is arranged on the base.
- the filter includes a filter upper port, a filter membrane, a filter membrane platform and a filter lower port.
- the filter membrane is placed on the filter membrane platform; the upper port of the filter is connected to the blood sample container, and the lower port of the filter is connected to the waste liquid tank through the infusion device.
- the filter membrane is made of a hydrophobic material, and the filter holes with a diameter of 8 micrometers are evenly spread on it.
- the detection method provided by the present invention can detect the expression of NSE in patients with advanced or recurrent small cell lung cancer without puncture biopsy to obtain tissue samples.
- the technology is minimally invasive and can be detected in real time.
- the method provided by the present invention can avoid false positive results caused by edge effects that may occur during the staining process, has good stability, reduces cell loss, and improves detection accuracy.
- Figure 1 is a schematic diagram of the structure of the membrane filtration device of the present invention.
- FIG. 2 is a schematic cross-sectional view of the structure of the filter of the membrane filtration device of the present invention
- FIG. 3 is a schematic diagram of the structure of the filter membrane of the membrane filtration device of the present invention.
- Figure 4 is an image of circulating tumor cells obtained from peripheral blood of a lung cancer patient
- Component content 6 ⁇ PBS buffer 60mL Diluent 45mL Decolorizing liquid 1mL Staining solution A 0.5mL Staining Solution B 1mL NSE (rabbit) primary antibody 100 ⁇ L Goat anti-rabbit IgG/HRP 100 ⁇ L SABC 100 ⁇ L 0.1% Triton X-100 100 ⁇ L 0.3% H 2 O 2 100 ⁇ L Reagent A 0.5mL Reagent B 1mL
- the membrane filtration device is composed of a filter 3, a filter membrane 7, a blood sample container 2, a waste liquid tank 5, and an iron stand 1;
- the diameter of tumor cells is generally greater than 15 microns, and the diameter of blood cells (including red blood cells and white blood cells) is generally less than 8 microns. Therefore, after the peripheral blood containing CTC is filtered, the blood cells can be filtered because the diameter is smaller than the filter hole 10, and the CTC is larger than the diameter. The filter hole 10 is trapped on the filter membrane 7.
- the detection accuracy of the ethanol and 1,2-propanediol mixed solvent of the present invention after solid sealing can reach 100%, and The accuracy of a single ethanol is 85%, while the accuracy of using a single 1,2-propanediol is only 70%, which can avoid false positive results caused by edge effects that may occur during the staining process, and has good stability and reduces cells.
- the loss of detection improve the accuracy of detection.
- Figure 4 is an image of circulating tumor cells isolated from peripheral blood of a patient with non-small cell lung cancer. It is a CTC cell with nuclear atypia, high nuclear to cytoplasmic ratio, cell diameter (long end) greater than 15 ⁇ m, and deep nuclear staining.
- the detected circulating tumor cells were confirmed with immunohistochemistry to confirm the expression of NSE and compared with the NSE results of large specimens of small cell lung cancer to observe the differences. It is mainly aimed at patients with negative NSE expression in gross specimens and positive expression of circulating tumor cells, and guides the treatment of small cell lung cancer. Targeted therapy provides new ideas for targeted therapy of small cell lung cancer.
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Abstract
Description
组分 | 含量 |
6×PBS缓冲液 | 60mL |
稀释液 | 45mL |
脱色液 | 1mL |
染色液A | 0.5mL |
染色液B | 1mL |
NSE(兔)一抗 | 100μL |
山羊抗兔IgG/HRP | 100μL |
SABC | 100μL |
0.1%Triton X-100 | 100μL |
0.3%H 2O 2 | 100μL |
试剂A | 0.5mL |
试剂B | 1mL |
Claims (7)
- 一种检测小细胞肺癌患者外周血循环肿瘤细胞NSE基因突变的试剂盒,其特征在于,包括稀释液45mL、脱色液1mL、染色液A 0.5mL、染色液B 1mL、NSE(兔)一抗100μL、山羊抗兔IgG/HRP 100μL、SABC 100μL、0.1%Triton X-100 100μL、0.3%H 2O 2100μL、试剂A、试剂B、6×PBS缓冲液60mL;所述PBS缓冲液的pH值为7.4。
- 根据权利要求1所述的试剂盒,其特征在于,所述稀释液是由1mmol/L EDTA+0.1%BSA+0.1%海藻糖+0.2%聚氧乙烯聚氧丙烯醚嵌段共聚物组成,所述基础液为Tris-HCl缓冲剂。
- 根据权利要求1所述的试剂盒,其特征在于,所述脱色液是由95%酒精与100%二甲苯按容积比1:1组成。
- 根据权利要求1所述的试剂盒,其特征在于,所述染色液A为DAB染色液;所述染色液B为苏木素染色液。
- 根据权利要求1所述的试剂盒,其特征在于,所述试剂A为质量分数为0.6%的羟丙基甲基纤维素二甲苯混合液;所述试剂B为乙醇和1,2-丙二醇按照体积比3:1组成。
- 一种利用权利要求1-5任一项所述的试剂盒非诊断目的检测小细胞肺癌患者外周血循环肿瘤细胞NSE基因突变的方法,其特征在于,包括以下步骤:(1)利用膜过滤装置分离获取无法获得组织标本的晚期或复发小细胞肺癌患者外周血中的CTC:采集无法获取组织标本的晚期或复发小细胞肺癌患者外周血:肘正中静脉外周血5ml;(2)外周血样预处理:将采集的外周血样采用稀释液进行10倍稀释,稀释后加多聚甲醛固定外周血样10分钟,固定终浓度为0.25%;(3)利用膜过滤分离肿瘤细胞装置过滤外周血样,分离获得外周血CTC:将预处理的外周血样加入到膜过滤分离肿瘤细胞装置的血样容器中,使其依靠重力自然过滤;(4)过滤结束后,从膜过滤分离肿瘤细胞装置中取下滤器,将循环肿瘤细胞染色液A液0.5ml加入到滤器中,染色3min,PBS缓冲液冲洗干净;滤液过滤完全后加入染色液B液1ml,染色2min,纯水1ml冲洗2次,取下滤膜,放置在载玻片上,干燥后在显微镜下观察,确定是否存在CTC;(5)运用免疫组化技术检测CTC的NSE表达情况。
- 根据权利要求6所述的检测方法,其特征在于,所述检测CTC的NSE表达的具体方法如下:(1)脱色:将带有CTC的滤膜从载玻片上取下,置于脱色液中浸泡4-6小时,脱去CTC 染色液;(2)滴加100μl 0.1%Triton X-100,室温孵育15min,DI水洗2min×3次;(3)滴加100μl 0.3%H 2O 2,室温孵育10min,PBS洗2min×3次;(4)滴加100μl NSE(兔)一抗,室温孵育2h或4℃过夜,PBS洗2min×3次;(5)滴加100μl山羊抗兔IgG/HRP,18~26℃温度下孵育20min,PBS洗2min×3次;(6)滴加100μl DAB显色液,18~26℃孵育并随时在显微镜下观察显色情况,观察时间为3~10min;(7)显色完成后,弃掉DAB显色液,流水冲洗5min,苏木素染色5min;(8)盐酸酒精分化8秒,自来水返蓝5min;(9)将返蓝后的CTC采用75%乙醇(1min),95%乙醇(1min),100%乙醇(1min)梯度乙醇脱水,然后加入0.5mL试剂A,振荡均匀后,加入1mL试剂B,摇动混合均匀后,离心沉淀,将沉淀物采用中性树脂封固;(10)光学显微镜下镜检。
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