Cerebrospinal fluid VGF protein kit and application thereof in medulloblastoma metastasis evaluation
A technology for medulloblastoma and cerebrospinal fluid, applied in the biological field, can solve problems such as the inability to detect differential proteins, decrease the stability and sensitivity of quantitative analysis, and achieve high clinical application value
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Embodiment 1
[0023] Analysis of peptide content in cerebrospinal fluid by DIA method
[0024] CSF sample preparation: Cells were centrifuged at 20,000g for 10 minutes at 4°C in a refrigerated centrifuge to remove insoluble material and cells. Add 1M DTT to each case of cerebrospinal fluid to a final concentration of 5mM, and reduce at 56°C for 1 hour. After cooling to room temperature, 0.5M IAM was added to a final concentration of 10 mM, and alkylation was carried out at room temperature for 45 minutes. The final concentration of L-cysteine at room temperature is 20mM, and the alkylation reaction is terminated for 20 minutes; the final concentration of 1M TEAB is added to 0.1M, and trypsin (trypsin: sample, 1:50, m / m) is enzymatically hydrolyzed overnight , add trypsin again for 4 hours the next day; add formic acid to a final concentration of 1% to stop the enzymatic hydrolysis; extract the product with a C18 extraction column, dry and extract it with a vacuum concentrator after desal...
Embodiment 2、DI
[0029] Embodiment 2, DIA method detects cerebrospinal fluid VGF protein concentration
[0030] Collection of specimens: After obtaining the consent of 29 patients with medulloblastoma (including 14 patients with no metastasis and 15 patients with distant metastasis) who visited the Department of Neurosurgery of Huashan Hospital from 2006 to 2014, they underwent routine lumbar puncture. 5ml of cerebrospinal fluid was collected from each person and stored in a -80°C refrigerator;
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