Blood miRNA marker related to liver cancer and application thereof

A marker and liver cancer technology, applied in the field of biomedicine, can solve the problems of unsatisfactory sensitivity and specificity, and achieve the effects of improving sensitivity and specificity, accurate quantification, and easy detection

Inactive Publication Date: 2014-11-19
FIRST HOSPITAL AFFILIATED TO GENERAL HOSPITAL OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sensitivity and specificity of these two methods are not very satisfactory

Method used

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  • Blood miRNA marker related to liver cancer and application thereof
  • Blood miRNA marker related to liver cancer and application thereof
  • Blood miRNA marker related to liver cancer and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Screening of miRNAs associated with human liver cancer

[0054] 1.1 Collection of samples and collation of sample data

[0055] The inventor collected a large number of peripheral blood samples from patients with liver cancer and benign liver diseases in Beijing Cancer Hospital in January 2013 (the samples used for research were collected at the same time, sampled, subpackaged, and stored under uniform conditions). The inventor selected 20 cases of plasma from patients with liver cancer (hepatitis B-cirrhosis-liver cancer) randomly collected in the same hospital and as far as possible in the same department, and 20 cases of plasma from patients with benign liver diseases randomly collected in the same hospital and the same period as the experimental group. Try to avoid taking plasma samples from people with a family history of liver cancer for miRNA chip detection.

[0056] 1.2 miRNA microarray detection

[0057] 1.2.1 Isolation and purification of exosome ...

Embodiment 2

[0074] Example 2 QPCR verification of differentially expressed miRNAs

[0075] According to the detection results of the miRNA chip, miRNA-26a and miRNA-199a were selected for large sample QPCR verification. According to the method of sample collection and sample data arrangement in Example 1, 100 samples were selected from the liver cancer group and the benign liver disease group.

[0076] 2.1 The RNA extraction process is the same as in Example 1.

[0077]2.2 Reverse transcription: Mix 10 pg-1 μg of total RNA template with 2 μl 10* buffer, 2 μl dATP (10 mM), 0.5 μl polyA polymerase, 0.5 μl ribonuclease (RNase) inhibitor and ribonuclease free water (RNase free water) to a final volume of 20 μl, and incubated at 37°C for 1 h. Then add 1 μl 0.5 μg / μl Oligo(dT) specific RT primer to the reaction tube, incubate at 70°C for 5 minutes and immediately incubate on ice for at least 2 minutes to break the secondary structure of RNA and primers. Finally, mix the above 20 μl reaction ...

Embodiment 3

[0079] Example 3 Analyzing the diagnosis of miRNA on the pathogenesis of liver cancer

[0080] The exosome-derived miRNA-26a and miRNA-199a were used as the research objects, and compared with the plasma free miRNA in the sensitivity and specificity of the control group and the liver cancer group. Taking liver cancer patients as the experimental group, liver cirrhosis patients and normal people as the control group, exoquic reagent was used to extract the exosome in the plasma (the steps are the same as in Example 1). 40 cases of liver cancer plasma samples, 20 cases of liver cirrhosis patients and 20 cases of normal human plasma samples were selected for miRNA-26a QPCR experiment, the CT value of each sample was obtained, and the scatter plot was made by using the ratio of sample miRNA-26a CT value to U6 CT value ( Figure 2A with Figure 2B ), the experiment proved that the aggregation of exosome group was better than that of plasma group. The experimental results of exosom...

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Abstract

The invention discloses a blood miRNA marker related to liver cancer and an application thereof. The marker is the combination of tumor-induced exosome sourced miRNA-26a and miRNA-199a in human blood. According to the invention, tumor-induced exosome in peripheral blood of liver cancer patient and liver benign disease patient can be separated and purified, miRNA of two expression difference can be analyzed and screened by a miRNA chip, and the above conclusion is passed by a QPCR verification. The marker and its detection reagent can be used for preparing a diagnostic kit, which can be used for early diagnosis of liver cancer.

Description

technical field [0001] The invention belongs to the field of biomedicine, in particular to a blood miRNA marker related to human liver cancer and its application; in particular to the combination of miRNA-26a and miRNA-199a derived from tumor-derived exosomes in human blood and its use in the diagnosis of liver cancer in the application. Background technique [0002] MicroRNA (micro RNA, referred to as miRNA) is a kind of short sequence, non-coding, single-stranded small molecule RNA with regulatory function, about 18-24nt in length. MicroRNAs are derived from long-chain RNA initial transcripts (Pri-miRNA) with a length of about 1000 bp, and Pri-miRNA molecules are cleaved by Drosha enzymes in the nucleus to form miRNA precursors with a stem-loop structure of about 60-80 nt (Pre -miRNA). After miRNA precursors are transported to the cytoplasm, they are further processed into miRNAs. [0003] MicroRNAs play an important role in animal and plant cells through cleavage and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/11C12Q1/68
Inventor 肖文华王硕屈雪玲李小梅董伟伟赵慧霞
Owner FIRST HOSPITAL AFFILIATED TO GENERAL HOSPITAL OF PLA
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