A method for rapid exosome quantification using fluorescence ratios

An exosome and ratio technology, applied in the field of fluorescence detection, can solve the problems of expensive experimental instruments, cumbersome experimental operations, and inaccurate results of immunoquantitative methods, and achieve the effects of convenient operation, high efficiency, and low cost

Inactive Publication Date: 2020-07-24
DALIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This quantitative method has the problems of cumbersome experimental operation and expensive experimental equipment.
Moreover, the relative content of commonly used exosome marker proteins is different in different types of exosomes, so the results of the immunoassay of exosomes are not accurate enough.

Method used

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  • A method for rapid exosome quantification using fluorescence ratios
  • A method for rapid exosome quantification using fluorescence ratios
  • A method for rapid exosome quantification using fluorescence ratios

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] Preparation of high-purity exosome standard solution

[0045] The ultracentrifugation method reported in the reference literature was used to extract and purify exosomes, treat 30mL MCF-7 cell culture medium, dissolve the exosome precipitate with 0.22μm PBS solution, and wash with PBS multiple times through a 100KD ultrafiltration tube to remove residual protein. Finally, 0.22 μm PBS was added to dissolve the exosome precipitate to obtain the exocrine standard solution. Exosome standard solution was quantified by exosome BCA protein quantification method.

[0046] Preparation of standard curve for BCA protein quantification method:

[0047] Take 0, 1, 2, 4, 8, 12, 16, and 20 μL of standard BSA protein solution (0.5 μg / μL) in sequence to prepare standards with concentrations of 0, 0.025, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 μg / μL For BSA samples, if the sample is less than 20 μL, add PBS solution to make the volume to 20 μL. Add 200μL of BCA working solution, place at 37...

Embodiment 1

[0048] Example 1 is derived from the determination of exosome concentration in Hela cell culture fluid

[0049] 1. Preparation of exosomes from Hela cell culture medium

[0050] The ultracentrifugation method reported in the literature was used to separate and purify exosomes in Hela cell culture medium. The ultracentrifugation method reported in the reference literature was used to separate and purify exosomes, and the general experimental procedure is as follows. Hela cells were cultured in DMEM medium containing 10% exosome-depleted fetal bovine serum, 1% penicillin and streptomycin. Use 75cm 2 Cell culture flasks were cultured in a 5% CO2 incubator at 37°C to 80% confluency, collected 15 mL of Hela cell culture medium, centrifuged at 4°C, 2000g for 10 minutes to remove cell debris, and then collected supernatant and passed through a 0.22 μm filter , and the supernatant was ultracentrifuged at 100,000g for 2h at 4°C. The precipitate was retained, washed with PBS, and ce...

Embodiment 2

[0057] Example 2 is derived from the determination of the concentration of exosomes in saliva

[0058] 1. Preparation of exosomes from saliva

[0059] According to Example 1, the method of ultracentrifugation was used to separate and purify exosomes in saliva.

[0060] 2. Preparation of kit dye A, B mixed solution

[0061] Prepare the mixed DMSO master solution of dye A and dye B, dye A is A-2, and dye B is B-2. The DMSO stock solution concentration of dye A was 200 μM, and the DMSO stock solution concentration of dye B was 2 mM. The final use concentrations of dye A and dye B were 200 nM and 2 μM, respectively.

[0062] 3. Preparation of Standard Curve for Fluorescence Ratio Quantification

[0063] Take 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, and 250 μL of exosome standard solution, respectively, and make the concentrations of 0, 4.52, 9.04, 13.56, 18.07, 22.59, 27.10, 31.62, 36.14, 40.66, 45.18 μg / μL exosome standard solutions. The PBS solution added to the 0.22μm...

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Abstract

A method for rapidly quantifying exosomes using fluorescence ratios belongs to the technical field of fluorescence detection. The method involves two fluorescent dyes. Dye A is a highly water-soluble dye with no affinity for membrane structure, which is used as an internal reference during the experiment. Dye B is a specific wash-free membrane dye. Dye B can show strong luminescent properties after being combined with lipophilic membrane structure, but in the water environment that is not combined with lipophilic membrane structure due to its hydrophobicity Aggregation occurs without fluorescence. The present invention provides a method for rapid quantification of exosomes. Based on the ratio quantification of two fluorescent dyes, the determination of exosomes in biological samples is successfully realized. The method has the advantages of high efficiency, low cost, convenient operation, high accuracy of determination results and the like. It is expected to be widely used in exosome-related research. The method is applied to cell culture medium, saliva, serum, urine, emulsion.

Description

technical field [0001] The invention specifically relates to a method for rapid quantification of exosomes using fluorescence ratio, which belongs to the technical field of fluorescence detection. Background technique [0002] Exosomes are small extracellular vesicles formed by cells through the process of "endocytosis-fusion-efflux". Lipid bilayer structure vesicles with a diameter of 30-150nm. As an important intercellular information transfer molecule and genetic material transfer carrier, exosomes contain a variety of proteins and RNA substances, which are widely distributed in human blood, urine, saliva and other body fluids as well as tumor cell culture fluid. Exosomes secreted by tumor cells can promote tumor angiogenesis, and can also affect tumor growth and metastasis by regulating the tumor microenvironment. Exosomes play an important role in the development of tumors. In exosome-related research, it is very important to quickly and accurately quantify the isolat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6428G01N2021/6439C09B67/0083
Inventor 肖义李宁张新富陈令成
Owner DALIAN UNIV OF TECH
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