EP3639024A1 - Verfahren zum nachweis von extrazellulären vesikeln in einer probe - Google Patents
Verfahren zum nachweis von extrazellulären vesikeln in einer probeInfo
- Publication number
- EP3639024A1 EP3639024A1 EP18729021.8A EP18729021A EP3639024A1 EP 3639024 A1 EP3639024 A1 EP 3639024A1 EP 18729021 A EP18729021 A EP 18729021A EP 3639024 A1 EP3639024 A1 EP 3639024A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- extracellular vesicles
- dad
- probes
- substrate
- net
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N33/5308—Immunoassay; Biospecific binding assay; Materials therefor for analytes not provided for elsewhere, e.g. nucleic acids, uric acid, worms, mites
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
- G01N21/6458—Fluorescence microscopy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
- G01N33/5008—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
- G01N33/5076—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics involving cell organelles, e.g. Golgi complex, endoplasmic reticulum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/551—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being inorganic
- G01N33/552—Glass or silica
Definitions
- the invention relates to a method for detecting extracellular vesicles in a sample.
- Extracellular vesicles are membrane particles that can be sequestered by almost any cell and resumed by a variety of cells. These vesicles can transmit information from one cell to another. A distinction is made between three classes of extracellular vesicles: exosomes with a diameter smaller than 100 nm, which originate from endosomes of the cell interior. Larger microparticles (100-1000 nm), which separate directly from the cell membrane. The third class of extracellular vesicles are vesicles that arise during apoptosis. The vesicles can be generated by different factors, such as extracellular stimuli, microbial infections and other stress factors. Extracellular vesicles consist of a lipid bilayer in which membrane proteins are integrated and a solution in the interior.
- proteins DNA and / or RNA, which is referred to as cargo.
- a few proteins are found in all extracellular vesicles and are secreted independently of the cell type [1]. These include proteins that are found in the cell interior, such as
- extracellular vesicles are released by cells into the surrounding medium and are also excreted renally, they are found in body fluids such as blood, cerebrospinal fluid, as well as in urine, in which they are detected and can provide information about a disease even without biopsy [3, 7 ].
- Another field of application is the use of extracellular vesicles which have been secreted by cancer cells. These could be used as a vaccine [8]. This allows immunization of high-risk patients on the one hand and on the other hand, one can biopharmaceutical agents, eg. As antibodies, produce and use for therapeutic purposes. The direct use of exosomes for therapeutic purposes is also considered [7].
- the gold standard in the detection and characterization of extracellular vesicles are electron microscopic techniques, of which cryo-transmission electron microscopy is the most sensitive technique.
- This method provides the highest resolution and the most accurate size distribution of extracellular vesicles, and it is also possible to characterize extracellular vesicles with immunostaining.
- the disadvantage is the sample preparation difficult, the measurement extremely tedious and the method very expensive overall. It also requires well-trained staff, which makes it neither suitable for absolute quantification nor for routine diagnostics [9].
- FCM flow cytometer
- the flow cytometer sorts and counts the light scattering based on the refractive index.
- the scattering intensity can also provide information on the size of individual particles, the lower detection limit is disadvantageously about 400 nm.
- extracellular vesicles are additionally labeled with a fluorescence-labeled antibody and, in addition to light scattering, also evaluates the fluorescence signal. The advantage is that extracellular vesicles can be characterized and the size resolution limit drops to about 100 nm.
- the fluorescence signal is recorded with a camera and different wavelengths are excited, with the possibility of detecting different types of extracellular vesicles.
- Disadvantages of the technique lie in the fact that only one property can be assigned to a particular vesicle in the flow, so that the method also detects residues from the medium unless they have been laboriously removed.
- the lower resolution limit is 100 nm for image-guided flow cytometers [9].
- the sample solution flows through a pore between two electrodes to which a voltage is applied. Passing particles increase the electrical resistance between the electrodes, allowing particles to be counted.
- the achievable lower detection limit of such methods is 40 nm and depends on the hole diameter.
- the disadvantage is that the pore can clog up and that it can be difficult to find the optimal settings to count all particles in samples with heterogeneous size distributions.
- the method does not characterize extracellular vesicles [10].
- DLS Dynamic light scattering
- Nanoparticle Tracking Analysis uses light scattering to track particle motion and record it with a camera. From the data obtained, conclusions can be drawn about the size distribution and its concentration. Some devices are equipped with a fluorescence detection system that allows to track labeled extracellular vesicles as well. In heterogeneous size distributions but samples must be measured in different dilutions. The lower detection limit is 50 nm [9].
- the object of the invention is therefore a method for detecting extracellular vesicles in any samples, for.
- body fluids such as blood plasma, serum, urine, cerebrospinal fluid but also cell culture supernatants to provide.
- Another object of the invention is to provide a kit for carrying out the detection.
- the object is achieved by a method for detecting extracellular vesicles in a sample, comprising the following steps: a) application of the sample to a substrate, b) addition of probes suitable for the detection, which mark these by specific binding to the extracellular vesicles and c ) Detection of the extracellular vesicles by measuring a specific signal of the probe, wherein step b) before step a) can be performed.
- the object of the invention is achieved.
- the method is characterized in that, prior to step a), immobilization of capture molecules for the extracellular vesicles on the substrate takes place.
- non-specifically bound molecules and particles are removed by washing after bringing the extracellular vesicles into contact with the probes. It can be advantageously selected probes which bind to the extracellular vesicles, wherein the probes z. B. also after binding are able to emit a specific signal.
- the contacting of the extracellular vesicles with the capture molecules and the probes can occur simultaneously.
- the contacting of the extracellular vesicles with the probes may also be done prior to contacting the capture molecules.
- the method advantageously permits determination of the size distribution of the extracellular vesicles, especially in the size range of 10-100 nm for exosomes and for 100-1000 nm for microparticles, as shown below.
- the method succeeds in detecting the extracellular vesicles in any
- the method may advantageously allow qualitative detection of extracellular vesicles, as well as quantification and characterization in any samples.
- a direct and absolute quantification of the number of extracellular vesicles and, on the other hand, a characterization of the size distribution of extracellular vesicles are advantageously ensured.
- the characterization can also be carried out by quantification and identification of proteins, DNA and RNA in the interior of the vesicle and / or by membrane proteins.
- any sample is meant also buffers with different additives or culture media, and the sample may be taken ex vivo from body fluids, or may be samples from the environment, such as aquatic, plant and soil samples, as well as food are directly examined, and the extracellular vesicles are detected.
- a specific variant of the method according to the invention is the quantitative and / or qualitative determination of extracellular vesicles which contain at least one binding site for a capture molecule and at least one binding site for a probe.
- This procedure comprises the following steps:
- Method for the quantitative and / or qualitative determination of extracellular vesicles containing at least one binding site for a capture molecule and at least one binding site for a probe comprising the following steps: a) immobilizing catcher molecules on a substrate, b) bringing the extracellular vesicle into contact with the capture molecules, c Immobilizing the extracellular vesicles on the substrate by binding to capture molecules, d) contacting the extracellular vesicles with the probes, and e) removing non-specifically bound molecules and particles e.g. F) binding the probes to the extracellular vesicles, which probes are capable of emitting a specific signal and steps b) and d) may be concurrent or d) prior to b).
- the steps c) and f) can thus advantageously be carried out simultaneously.
- an immobilization of probe-labeled extracellular vesicles on the substrate thus takes place.
- the probes are bound to the extracellular vesicles before the extracellular vesicles are contacted with the capture molecules and immobilized to the substrate.
- the sample is chemically fixed after contacting the extracellular vesicles with the probes, e.g. By formaldehyde.
- the probe may be supplemented with DNA and RNA binding probes after or during or prior to binding of the probes to the extracellular vesicles.
- a detergent is used to make the membrane of the extracellular vesicle permeable and, for.
- a detergent is used to make the membrane of the extracellular vesicle permeable and, for.
- probes to the extracellular vesicle probes may penetrate into the interior of the extracellular vesicles.
- the "quantitative determination” means first of all the determination of the concentration of the extracellular vesicles, and therefore also the determination of their presence and / or absence.
- the quantitative determination also means the selective quantification of certain types of extracellular vesicles. Such quantification can be detected via the corresponding specific probes.
- the "qualitative determination” means the characterization of the extracellular vesicles.
- the extracellular vesicles are labeled with one or more probes useful for detection and / or specific probes.
- the probes contain an affine molecule that recognizes and binds to a binding site of the extracellular vesicle.
- the probes contain at least one detection molecule or part of the molecule which is attached to the extracellular vesicle-affine molecule or part of the molecule is covalently bound and can be detected and measured by means of chemical or physical methods.
- the probes can have identical affine molecules or parts of molecules with different detection molecules (or parts).
- different affine molecules or molecular moieties may be combined with different detection molecules or moieties, or alternatively, different affine molecules or moieties may be combined with identical detection moieties or moieties.
- a spatially resolved determination of the probe signal ie a spatially resolved detection of the signal emitted by the probe. Accordingly, in this embodiment of the invention, methods based on a non-spatially resolved signal, such as ELISA or sandwich ELISA, are excluded.
- a high spatial resolution is advantageous.
- so many data points are collected that the detection of an extracellular vesicle before a background signal, which z. B. by device-specific noise, other non-specific signals or nonspecifically bound probes is made possible. In this way, so many values are read out (read-out values), such as spatially resolved events such. As pixels are present.
- the spatial resolution determines each event against the respective background and thus represents an advantage over ELISA methods without spatially resolved signal.
- the spatially resolved determination of the probe signal is based on total internal reflection fluorescence microscopy (tirfm) and the study of a small volume element compared to the volume of the sample, in the range of Femtolitern below a Femtoliters, or a volume range above the contact surface of the capture molecules with a height of 500 nm, preferably 300 nm, more preferably 250 nm, in particular 200 nm.
- extracellular vesicles are detected which are selected from the group consisting of or consisting of exosomes and / or microparticles.
- the material of the substrate is selected from the group consisting of or consisting of plastic, silicon and silicon dioxide.
- glass is used as the substrate.
- the capture molecules are covalently bound to the substrate.
- a substrate which has a hydrophilic surface.
- this is achieved by applying a hydrophilic layer, before step a), to the substrate.
- the capture molecules bind, in particular covalently, to the substrate or to the hydrophilic layer with which the substrate is loaded.
- the hydrophilic layer is a biomolecule-repellent layer, so that the non-specific binding of biomolecules to the substrate is advantageously minimized.
- the catcher molecules preferably covalently immobilized. These are affinitive to a feature of extracellular vesicles.
- the catcher molecules can all be identical, or mixtures of different catcher molecules can be present.
- the same molecules are used as catcher molecules and probes.
- the capture molecules do not comprise a detection molecule or moieties that are suitable for detection.
- the hydrophilic layer is selected from the group consisting of or consisting of polyethylene glycol, poly-lysine, preferably poly-D-lysine, and dextran or derivatives thereof, preferably carboxymethyl-dextran (CMD).
- CMD carboxymethyl-dextran
- the surface of the substrate is first hydroxylated before application of the hydrophilic layer and then activated with amino groups. This activation with amino groups takes place in an alternative by contacting the substrate with APTES (3-aminopropyltrietoxysilane) or with ethanolamine.
- the contacting of the substrate with APTES occurs in the gas phase; the optionally pretreated substrate is thus vapor-coated with APTES.
- the substrate For the coating with dextran, preferably carboxymethyl-dextran (CMD), the substrate with an aqueous solution of CMD in a concentration of 10 mg / ml or 20 mg / ml and optionally N-ethyl-N- (3-dimethylaminopropyl) Car - Bodiimid (EDC), (200 mM) and N-hydroxysuccinimide (NHS), (50 mM) were incubated and then washed.
- CMD carboxymethyl-dextran
- the carboxymethyl-dextran is covalently bonded to the glass surface, which was first hydroxylated and then functionalized with amino groups.
- Microtiter plates preferably with a glass bottom, can also be used as the substrate. Since the use of concentrated sulfuric acid is not possible when using polystyrene frames, the activation of the glass surface in one embodiment of the invention takes place analogously.
- Covalent, preferably covalent, catcher molecules are immobilized on this hydrophilic layer which are affine towards a feature of the extracellular vesicle to be detected. This feature can be a protein.
- the capture molecules may all be identical or mixtures of different capture molecules.
- the capture molecules are immobilized on the substrate, optionally after activation of the CMD-coated support by a mixture of EDC / NHS (200 or 50 mM).
- Remaining carboxylate end groups to which no capture molecules have been bound can be deactivated.
- Ethanolamine is used to deactivate these carboxylate end groups on the CMD spacer.
- the substrates or carriers are optionally rinsed with buffer.
- the sample to be measured is brought into contact with the substrate thus prepared and optionally incubated.
- the sample to be examined may be endogenous fluids or tissues.
- the sample is selected from CSF, blood, plasma and
- Urine The samples may undergo different processing steps known to those skilled in the art.
- the application of the sample is carried out directly on the substrate, for. B. the uncoated substrate, optionally by covalent bonding.
- the binding is to an activated surface of the substrate.
- a pretreatment of the sample takes place according to one or more of the following method steps:
- enzymes for example proteases, nuclease, lipases,
- the sample is preferably brought into contact with the substrate immediately and / or without pretreatment. Unspecific bound substances can be removed by washing steps.
- the immobilized extracellular vesicles are labeled with one or more probes useful for further detection.
- the individual steps can also be carried out in a different order according to the invention. Suitable washing steps remove excess probes that are not bound to extracellular vesicles.
- these excess probes are not removed. This eliminates a washing step and there is no equilibrium shift in the direction of dissociation of the extracellular vesicle-probe complexes or compounds. Due to the spatially resolved detection, the excess probes are not detected during the evaluation.
- the extracellular vesicle binding sites are epitopes and the capture molecules and probes are antibodies and / or antibody moieties and / or fragments thereof.
- the capture molecules and the probes can be identical.
- the capture molecules and the probes differ. So z. B. different antibodies and / or antibody parts and / or fragments can be used as catcher molecules and as probes. In a further embodiment of the present invention capture molecules and probes are used, which are identical to each other with the exception of the eventual (dye) label.
- At least two or more different capture molecules and / or probes are used which z. B. contain different antibodies and optionally also carry different dye label.
- the probes are characterized in that they emit an optically detectable signal selected from the group consisting of fluorescence, bioluminescence and chemiluminescence emission as well as absorption.
- the probes are thus labeled with fluorescent dyes.
- fluorescent dye the dyes known to those skilled in the art can be used.
- GFP Green Fluorescence Protein
- conjugates and / or fusion proteins thereof, as well as quantum dots can be used.
- quantum dots For quality control of the surface, for example, in demonstrating the uniformity of the coating with capture molecules, catcher molecules can be used labeled with fluorescent dyes.
- a dye is preferably used which does not interfere with the detection of the fluorescent dye of the probe on the extracellular vesicle.
- the detection of the immobilized and labeled extracellular vesicles by means of imaging of the surface, z. B. with laser scanning microscopy.
- the highest possible spatial resolution determines a high number of pixels, whereby the sensitivity as well as the selectivity of the method can be increased, as structural
- the detection is carried out, for example, preferably with spatially resolving fluorescence microscopy through a TIRF microscope, and the corresponding super-resolution variants thereof, such as STORM, dSTORM.
- a laser focus as z.
- FCS Fluorescence Correlation Spectroscopy System
- the probes may be selected such that the presence of single extracellular vesicle features, such as e.g. B. single membrane proteins that do not affect the measurement result.
- the probes can be selected such that extracellular vesicle species (phenotypes) can be determined for each individual extracellular vesicle.
- Additional probes may be selected to allow differentiation between DNA / RNA-containing extracellular vesicles and thus information about the interior of the extracellular vesicles.
- DNA / RNA-binding fluorophores such as DAPI from Hoechst can be used for this purpose.
- the spatially resolved information z.
- fluorescence intensity all used and detected probes used to z.
- image analysis options include z.
- the search for local intensity maxima in order to obtain from the image information the number of detected extracellular vesicles and also to be able to determine the particle sizes.
- the present invention also provides nanoparticle standards which have a defined size and preferably covalently carry the surface characteristics of the extracellular vesicles to be examined.
- the standards are preferably silica nanoparticles, but nylon nanoparticles are also possible.
- the present invention also provides a kit comprising one or more of the following components:
- Substrate optionally with a hydrophilic surface
- kits may be packaged in containers, optionally with / in buffers and / or solution.
- some components may be packaged in the same container.
- one or more of the components could be attached to a solid support, such as a solid support.
- kit may include instructions for using the kit for any of the embodiments.
- the above-described catcher molecules are already immobilized on the substrate.
- the kit may contain solutions and / or buffers. To protect the coating and / or the catcher molecules immobilized thereon, they may be overcoated with a solution or a buffer.
- Another object of the present invention is the use of the method according to the invention for the detection of extracellular vesicles in any samples for the quantification and thus titer determination of extracellular vesicles.
- the method thus also the detection of a disease such.
- a disease such as cardiovascular, kidney and cancer
- the detection of an immune response can be used in drug development, the direct and absolute quantification of extracellular vesicles, targeting therapy, differential diagnosis, protein-protein interaction detection and / or extracellular vesicle typing.
- Another object of the present invention is the use of the method according to the invention for monitoring therapies with extracellular vesicles and for monitoring and / or checking the effectiveness of active ingredients and / or healing methods.
- the method can therefore be used in clinical trials, studies and in therapy monitoring. For this purpose, samples are measured according to the method according to the invention and the results compared.
- Another object of the present invention is the implementation of the method of the invention for determining the effectiveness of drugs against diseased cells.
- the results are compared using the characterization of extracellular vesicles in samples.
- the samples are corresponding to body fluids taken before or after, or at different times after administration of the active ingredients or implementation of the healing process.
- the results are compared with a control which has not been subjected to the active ingredient and / or healing process.
- active substances and / or healing methods are selected.
- Another object of the present invention is the implementation of the method according to the invention for determining whether a person is taken in a clinical study.
- samples according to the invention are taken according to the invention.
- A) shows emissions at 705 nm (EM) and excitation at 633 nm (EX). This channel represents APC dyes.
- Sample 1 are cell culture supernatants from HEK cells that do not express NEF-mCherry and were treated with anti-MHC1 antibodies with PE stain.
- Sample 2 is equivalent to Sample 1, except that MHC1 antibodies carry an APC dye.
- Sample 3 contains cell culture supernatants from HEK cells expressing a NEF-mCherry fusion protein and labeled with anti MHC1 antibody-PE.
- Sample 4 is equivalent to Sample 3, except that the anti-MHC1 antibody was labeled with APC instead of PE.
- sample 5 cell culture supernatants from NEF-mCherry expressing cells were not labeled with antibodies.
- sample 1 and 3 differ significantly from the other samples. These samples were treated with anti-MHC1 antibodies bearing an APC dye. Extracellular vesicles carrying an MHC1 protein could thus be detected in these samples.
- sample 1 has a lower number of pixels than the remaining samples. In this fluorescence channel PE dyes and mCherry were excited and therefore no APC. This figure shows that it is possible to quantify PE (sample 2) and mCherry (sample 5), which is expressed in the cells and packaged in extracellular vesicles. The combination (samples 3 and 4) also provides signals that are suitable for quantification.
- NEF is the Negative Regulatory Factor, a protein found in exosomes.
- mCherry we mean a fluorescent protein with an absorption maximum at 558 nm and an emission maximum at 583 nm. Construction of the Assay:
- microtiter plates (Greiner Bio-one, Sensopiate Plus) with 384 reaction chambers (RK) and glass bottom were used.
- RK reaction chambers
- the surface of the microtiter plate was built up.
- the plate was placed in a desiccator containing a dish of 5% APTES in toluene.
- the desiccator was flooded with argon and incubated for one hour. Thereafter, the tray was removed and the plate dried for 2 hours in vacuo. 20 ⁇ of a 2 mM solution of SC-PEG-CM (MW 3400, Layman Bio) in deionized H 2 O was introduced into the RK of the dry plate and incubated for 4 hours.
- the RK was washed three times with water and then each with 20 ⁇ of an aqueous 200 mM EDC solution (1-ethyl-3- (3-dimethylaminopropyl) carbodiimides, Sigma) and with 50 mM NHS (N- Hydroxysuccinimide, Sigma) for 30 minutes. The plate was again washed three times with deionized water.
- the RK were coated with anti-CD63 antibodies and anti-MHCI antibodies as catcher molecule (20 ⁇ , per antibody 5 g ml -1 in PBS, 1 hour), followed by RK with the wash program consisting of three washes and one wash Empty eyes were treated with TBS containing 0.1% Tween-20 and TBS
- the detection antibodies used were anti-MHC1 antibodies which had been previously labeled with the fluorescent dyes PE (phycoeritrin) or with APC (allophycocyanin) .
- the detection antibodies used
- the maximum laser power (100%), an exposure time of 500 ms and a gain value of 800 were selected.
- the image data was evaluated afterwards.
- Intensity thresholds were set for each channel at approximately 25% gray levels in total intensity.
- the intensity threshold was first applied for each image in each channel, and then images of the same position were compared in both values. Only those pixels per image were counted, where in both channels the pixel is at the exact same position above the intensity threshold of the channel. Finally, the number of pixels over all images in each RK is averaged, then the mean values of the average pixel numbers of the replicate values are determined and the standard deviation is specified.
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017005543.2A DE102017005543A1 (de) | 2017-06-13 | 2017-06-13 | Verfahren zum Nachweis von Extrazellulären Vesikeln in einer Probe |
| PCT/DE2018/000145 WO2018228625A1 (de) | 2017-06-13 | 2018-05-16 | Verfahren zum nachweis von extrazellulären vesikeln in einer probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3639024A1 true EP3639024A1 (de) | 2020-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18729021.8A Withdrawn EP3639024A1 (de) | 2017-06-13 | 2018-05-16 | Verfahren zum nachweis von extrazellulären vesikeln in einer probe |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20200200740A1 (de) |
| EP (1) | EP3639024A1 (de) |
| JP (1) | JP2020523555A (de) |
| CN (1) | CN110869764A (de) |
| DE (1) | DE102017005543A1 (de) |
| WO (1) | WO2018228625A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2016327573B2 (en) | 2015-09-22 | 2022-07-14 | Trustees Of Boston University | Multiplexed phenotyping of nanovesicles |
| WO2017136676A1 (en) | 2016-02-05 | 2017-08-10 | Nanoview Diagnostics Inc. | Detection of exosomes having surface markers |
| WO2019232321A1 (en) | 2018-06-01 | 2019-12-05 | NanoView Biosciences, Inc. | Compositions, systems, and methods for enhanced label-free and fluorescence - based detection of nanoparticles |
| WO2020160402A1 (en) * | 2019-02-01 | 2020-08-06 | NanoView Biosciences, Inc. | Systems and methods for vesicle cargo labeling and detection |
| CN111323598A (zh) * | 2019-05-07 | 2020-06-23 | 北京益微生物科技有限公司 | 检测细胞胞外囊泡的膜蛋白的方法 |
| DE102020003794A1 (de) * | 2020-06-25 | 2021-12-30 | Forschungszentrum Jülich GmbH | Verfahren, Verwendung des Verfahrens sowle Kit zum Nachweis von Bioindikatoren in einer Probe |
| CN112782138B (zh) * | 2020-12-24 | 2021-10-29 | 生物岛实验室 | 用于检测细胞外囊泡的试剂盒及其应用 |
| CN113049552B (zh) * | 2021-03-07 | 2022-08-05 | 天津大学 | 基于外泌体检测和单分子荧光漂白技术的muc1蛋白定量检测方法 |
| CN116819080B (zh) * | 2023-07-28 | 2026-04-10 | 内蒙古民族大学 | 一种免分离的血浆中肿瘤来源细胞外囊泡检测方法 |
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| US8617806B2 (en) * | 2008-01-25 | 2013-12-31 | Hansabiomed Ou | Method to measure and characterize microvesicles in the human body fluids |
| DE102010019059A1 (de) * | 2010-05-03 | 2011-11-03 | Forschungszentrum Jülich GmbH | Sensoren zur intrazellulären Metabolit-Detektion |
| CA2808417A1 (en) * | 2010-08-18 | 2012-02-23 | Caris Life Sciences Luxembourg Holdings, S.A.R.L. | Circulating biomarkers for disease |
| DE102011057021A1 (de) * | 2011-12-23 | 2013-06-27 | Forschungszentrum Jülich GmbH | Verfahren zur selektiven Quantifizierung von A-Beta-Aggregaten |
| US20130273544A1 (en) * | 2012-04-17 | 2013-10-17 | Life Technologies Corporation | Methods and compositions for exosome isolation |
| WO2015045666A1 (ja) * | 2013-09-25 | 2015-04-02 | 国立大学法人東京大学 | 流体デバイス、エキソソームの分析方法、生体分子分析方法及び生体分子検出方法 |
| EP3143401A4 (de) * | 2014-05-15 | 2017-10-11 | Meso Scale Technologies, LLC | Verbesserte testverfahren |
| US20160320390A1 (en) * | 2015-05-01 | 2016-11-03 | Morehouse School Of Medicine | Compositions and methods for capturing exosomes |
| CA2988771A1 (en) * | 2015-06-09 | 2016-12-15 | The Board Of Regents Of The University Of Texas System | Diagnostic test for early stage cancer |
| CN104977277B (zh) * | 2015-07-17 | 2017-08-04 | 华东理工大学 | 一种可同时检测细胞内野生型和变异p53蛋白的纳米囊泡 |
| CN105651995B (zh) * | 2016-02-19 | 2018-02-27 | 武汉大复生物科技有限公司 | 检测CD105、CD144、CD34、KDR、Annexin V和CD63的试剂在制备检测血液中的内皮及内皮祖细胞释放的细胞外囊泡的试剂中的应用 |
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| US20200200740A1 (en) | 2020-06-25 |
| DE102017005543A1 (de) | 2018-12-13 |
| WO2018228625A1 (de) | 2018-12-20 |
| JP2020523555A (ja) | 2020-08-06 |
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